JPS6329025B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for guiding yarn from a yarn spool to a stitch forming point via a plurality of yarn guide rings and at least one yarn brake, and at least one of the yarn guide rings is connected to a yarn loop. The present invention relates to a yarn feeding device for a knitting machine, which is displaceably provided for forming.

BACKGROUND OF THE INVENTION Flat knitting machines, reciprocating circular knitting machines and other knitting machines inevitably experience changes in yarn tension when reversing the direction of motion, returning the yarn path, changing the knitted fabric width or reversing the direction of rotation of the knitting machine. In order to maintain a uniform thread tension, this variation in thread tension is normally compensated for by a swinging lever with a thread guiding ring which can swing under the action of a spring. However, this swinging lever requires a large space, and the length of the yarn section to be compensated or temporarily stored is determined by the arc drawn by the tip of the lever. It is insufficient for this purpose. In flat knitting machines, devices are also known for controlling the yarn path displacement in relation to the working width. Such devices are expensive to construct and require complex controls. It is also known to carry out the formation of yarn loops in flat knitting machines by means of linearly force-driven yarn guiding rings for yarn tension compensation (CH 535 309). However, the control of such a driven thread guiding ring is expensive and is not well suited for sensitive and rapid thread tension compensation.

Problem to be Solved by the Invention It is an object of the invention to provide a yarn feeding device which makes it possible to compensate or temporarily store long yarn sections with a small footprint.

Means for Solving the Problem In order to solve this problem, according to the invention, guide tracks are provided which extend vertically at both ends of the needle bed in the area between the needle beds and which are displaceable. A thread ring is provided on a sliding body as a weight that is freely vertically movable along the guide track and exerts thread tension, and a thread brake is provided in front of the thread guide ring which is displaceable in the thread running direction. Detectors for controlling the yarn brake and for controlling the knitting machine drive, which can be operated by the slide, are respectively provided in the upper region and at the lower end of the guide track.

Effects of the Invention Thus, according to the present invention, a vertical guide track is provided in the range between the needle bed and the bed at both ends of the needle bed, and along this guide track, the sliding body serving as a vertically movable weight is guided. By providing a thread loop, long thread loops (thread sections) corresponding to approximately twice the height of the needle bed can be compensated for or temporarily stored. Moreover, since the thread guide ring moves along the vertical guide track at both ends of the needle bed, the space occupied is significantly smaller than the conventional structure in which the thread guide ring is provided at the tip of the swing lever. Can be done. The formation of the thread loop through the thread guide ring is carried out by the vertical movement of the sliding body as a weight due to its own weight, so that a drive device for the thread guide ring is not required. When the yarn loop runs out, the slider takes the upper end position due to the yarn guide ring and operates the yarn brake control detector provided in the upper region of the guide track, so that the yarn brake is automatically released. , the thread can be pulled out without hindrance via this thread brake. On the other hand, if there is no yarn tension from the stitch forming point, the yarn guiding ring will fall from the upper end position due to the weight of the sliding body, so the yarn brake will again be controlled via the detector, and the yarn will pass through the yarn brake. Prevent it from being pulled out further.
When the thread breaks, the sliding body falls and operates the knitting machine drive device control detector, so the operation of the knitting machine is stopped.

Embodiment An embodiment of a yarn feeding device for a flat knitting machine constructed according to the present invention will be described below with reference to the accompanying drawings.

1 and 2 show an upright leg 10 of a flat knitting machine,
Needle beds 11 and 12, a carriage 14 movable on a guide rod 13, a bobbin table 15 provided on the back of the knitting machine and on which the thread bobbin 16 is placed, and a holder for the thread guide ring 18 provided above the bobbin table 15. 1
7 and, for example, a yarn feeding device 19.

Figure 1 also shows a pattern knitted fabric piece 20 completed on the knitting machine.
It shows. Furthermore, in FIG. 1, a yarn compensating device 21 is provided on both end faces of the flat knitting machine, to which yarn 22 drawn out from the yarn bobbin 16 is supplied, and from this yarn 22 passes through both ends of the needle bed to the normal yarn compensation device 21. The thread is fed to a thread path 40 which can be entrained by the carriage 14 as shown in FIG. A lateral thread guide stop 23 defines the maximum travel of the thread guide 40. The yarn section between the stopped state of the yarn path and the start of the working range (fabric edge) is compensated by the yarn compensation device 21 upon reversal of the working direction until the yarn path reaches the working range of the needle again.

2 and 3 show the detailed structure of both thread compensation devices 21. FIG. The yarn compensator 21 is configured, for example, for a total of six yarns 22/1 to 22/6.
As shown in FIG. 2, the yarns 22/1 to 22/6 pass through the yarn guide ring 24 of the yarn supply device 19 having a yarn storage cylinder, and are first applied as a yarn brake (hereinafter referred to as yarn tension device) that applies tension to the yarns. reaches the ball brake 25. 6 in total
The brake balls 26 of the two ball brakes 25 each have an electromagnetic coil 28 that is supplied with power via a power supply conductor 27.
Under the influence of this electromagnetic coil 28, the braking force and braking time of the ball brake 25 are controlled. After the ball brake 25 in the thread withdrawal direction, each thread is first passed through a fixed thread guide ring 29. A movable thread guide ring 31 is provided between the thread guide ring 29 and the second fixed thread guide ring 30. The displaceable guide ring 31 is connected to a slide 32, as shown in FIG. Supported for free movement. Each thread compensation device 21 therefore has six such guide tubes 3 for each displaceable thread guide ring 31.
4, these guide tubes are divided into two groups of three guide tubes 34 each and extend downwards to floor level. The number of guide tubes, their division into groups and their height arrangement can be arbitrary.

As can be seen in FIG. 3, an electric detector 35 is provided in the upper end region of each guide tube 34 and is connected via a connecting cable 36 to an electric control device (not shown), which includes a ball brake. 25
is also connected. When the displaceable guide ring 31 reaches between the adjacent fixed guide rings 29 and 30 in the vicinity of its upper end position, the detector 35 is actuated by the slide 32 of this guide ring 31. On the right side of FIG. 3, the displaceable thread guide ring 31 is shown in this upper end position. In this position, the corresponding thread tensioning device 25 is released via the electric control, so that its electromagnetic coil 28 is deenergized or set to a settable degree of braking by means of the regulator 41. 2 and 3 show the operating section of regulator 41. FIG.

When the thread tension is lost and the thread 22 loosens when the carriage 14 is reversed or the thread path returns,
The displaceable thread guide ring 31 falls downward due to the weight of its sliding body 32, forming a thread loop 37 between the thread guide rings 29,30. The guide tube 34 is equipped with a coiled compression spring 38 which exerts a preload on a preloaded slide 32 in the upper end position of the thread guide ring 31, so that the thread guide ring 3 can be immediately displaced in the event of a decrease in the thread tension.
Begin the downward movement of 1. When the thread loop 37 is reprocessed and the thread guide ring 31 moves upward, the spring 38
also acts as a restraining member.

When the sliding body 32 falls downward from the upper end position, the ball brake 25 is energized via the detector 35, and the brake ball 26 is pressed against the throne by the electromagnetic coil 28, so that the thread is not pulled out any further and the thread loop is closed. 37 is formed only from the yarn returned from the yarn channel.

When a thread breakage occurs, the displaceable thread guide ring 31 falls to the lower end of the guide tube 34. At the lower end of each guide tube 34 there is provided another electrical detector 39, shown in FIGS. 1 and 2, which operates the knitting machine in place of the thread monitor normally located above the needle bed. Stop.

The yarn compensator 21 constructed according to the invention allows the formation of large yarn loops 37 using a displaceable, low weight guiding ring 31, so that it can be operated with low yarn stresses. If necessary, the thread 22 can also be guided via two displaceable thread guide rings 31, so that the thread can also be provided with two compensation thread loops 37. The guide tube 34 can also be provided on a separate stand next to the knitting machine.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a flat knitting machine equipped with a yarn feeding device according to the present invention, FIG. 2 is a side view of this flat knitting machine as seen in the direction of the arrow in FIG. 1, and FIG. FIG. 2 is an enlarged view of the thread guide portion of FIG. 11, 12...needle bed, 22...thread, 25...thread brake, 31...displaceable thread guide ring, 32...
Sliding body, 34... Guide track (guide tube), 35, 3
9...detector, 37...thread loop.

Claims (1)

[Scope of Claims] 1. Yarn is guided from a yarn sump to a stitch forming location via a plurality of yarn guide rings and at least one yarn brake, and at least one of the yarn guide rings is displaceably provided to form a yarn loop. The needle bed 11, 12 in the range between the needle bed 11, 12 and the bed.
Guide tracks 3 extending vertically at both ends of 12.
4, a displaceable yarn guiding ring 31 is provided on a sliding body 32, which is freely vertically movable along the guide track 34 and serves as a weight for exerting yarn tension, and is displaceable in the yarn running direction. 31 , a thread brake 25 is provided which is controlled in relation to the position of the slide 32 along the guide track 34 , and in the upper region and at the lower end of the guide track 34 is provided a thread brake control actuator operable by the slide 32 . A yarn feeding device for a knitting machine, characterized in that a detector 35 and a knitting machine drive device control detector 39 are respectively provided. 2 A displaceable yarn guide ring 3 is attached to the upper end of the guide track 34.
2. The yarn feeding device according to claim 1, further comprising a spring 38 that applies a downward preload and an upward restraint to the first sliding body 32. 3. Claim 1, characterized in that a ball brake 25 with an electromagnetically operable brake ball 26 is provided as a controllable thread brake.
Yarn feeding device as described in Section.