CZ302877B6 - Device for making thread loop - Google Patents

Abstract

The invented device for making loop onto a thread (3) passing through a needle eye (2) and having a free end comprises a looper (5) being provided at its front end with a tip (4) and further comprising an inclined reed case (10) arranged just next to the tip (4). An elastic thin plate (11) is located between the tip (4) and the reed case (10), and at least at least the inclined reed case (10) is coupled with a drive.

Description

Technical field

BACKGROUND OF THE INVENTION The invention relates to a device for forming a loop on a thread passing through the handle of the needle and having a free end.

BACKGROUND ART

The presently known loop-forming devices are mainly used in sewing machines in which, by means of a hook, they intercept the continuous loose thread passing through the eye of the needle to form a double-thread bound stitch. A disadvantage of the prior art is the relative complexity. A further disadvantage is that the existing devices do not allow to move the formed handle into the lowered position and to work with the handle in that position.

It is an object of the invention to overcome or at least minimize the disadvantages of the prior art.

SUMMARY OF THE INVENTION

The object of the invention is achieved by a yarn loop forming device comprising a looper having a tip at its front end and further comprising an inclined pressure arm disposed adjacent the tip, wherein a resilient blade is disposed between the tip and the pressure arm; at least the inclined pressure arm is coupled to the drive.

The advantage of this arrangement is that a long loop of thread is formed with a loose (cut) end of the thread covered with a needle loop. The loop length is determined by the needle piercing distance of the material. Since the yarn has a loose end, it is fixed by the gripper in the gripper by a retainer, which prevents the yarn from being pulled out of the looper when the needle is retracted. The device also allows the end of the loop to be moved to the desired lowered position after the sewing needle has been moved to its return position.

Overview of the drawings

The invention is shown schematically in the drawing, wherein FIG. 1 shows a schematic arrangement of the device according to the invention and FIGS. 2a and 2b show the principle of operation of the device according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

The yarn loop forming device serves to engage the loop at the end of the thread 3 which is coated with the handle of the needle 2 and to move the loop of the thread 3 to the lowered position as shown in Figures 2a and 2b. The device comprises a looper 5, which is supported on one body by one end of the transverse axis 8 on the body 9. The pivoting movement of the looper 5 is ensured by a drive 6, eg a pneumatic cylinder which is supported on the body 9. , in the illustrated embodiment over the arm 7 mounted on the loop 5.

The looper 5 is provided with a tip 4 at its front end and further comprises an inclined pressure arm 10 disposed adjacent the tip 4, which in the illustrated embodiment at its upper end continuously connects to the front end of the loop 5 with the tip 4. placed on the body 9. The tip 4 passes on its underside into the looper 5 with a sharp edge 18.

- 1GB 302877 B6

The body 9 is mounted on the movable part 12 of the linear drive 13, for example on the piston rod of the pneumatic cylinder, the linear drive 13 being mounted in particular height-adjustable on the support plate 15. This also enables the position of the body 9 to be adjusted. The movement between the front and rear positions of the body 9 is due to the movement of the movable part 12 of the linear drive 13. The rear position of the body 9 is adjusted by a stop 16 on the body 9 and an adjustable screw 17 on the fixed part of the linear drive 13. 12 of the linear drive U- This arrangement makes it possible to move the end of the engaged thread loop 3 to different positions.

The device operates in such a way that after the material X has been pierced by the needle 2, the loose (cut) end 30 of the thread 3 coming out of the needle loop 1 is caught by the loop 4 of the looper. the foil 11 is pressed against the tip 4 by the arm 10 and grips the thread 3. The edge 18 of the tip 4 around which the thread 3 is wrapped is sharp, thereby ensuring that the needle 2 does not pull the free end of the thread 3 from the looper 5

Claims (5)

PATENT CLAIMS A device for forming a germ on a thread passing through the handle of the needle and having a loose end, characterized in that it comprises a looper (5) which is provided with a tip (4) at its front end and further comprising an inclined pressure arm arranged (10), wherein a resilient blade (11) is disposed between the tip (4) and the pressure arm (10) and at least the inclined pressure arm (10) is coupled to the drive (6). Apparatus according to claim 1, characterized in that the looper (5) is supported on one body (9) by its end pivotable about a transverse axis (8) and is coupled to a drive (6) which is also supported on the body (9). ), wherein the inclined pressure arm (10) at its upper end smoothly connects to the front end of the looper (5) with the tip (4). Device according to claim 2, characterized in that the body (9) is supported on the movable part (12) of the linear drive (13), which is mounted on the support plate (15). Device according to claim 3, characterized in that the linear drive (13) is mounted on a support plate (15) in a height-adjustable manner. Device according to any one of claims 1 to 4, characterized in that the tip (4) at its underside passes into the looper (5) by a sharp edge (18).