DE202004012028U1 - Bobbin holder for industrial sewing machine includes hollow freely rotating shaft for side unwinding of yarn - Google Patents

Abstract

A yarn bobbin (3) is placed on a hollow shaft (10), which can rotate freely on a support peg (22) running trough its center. The shaft (10) rests on a height-adjustable support (12), preferably comprising a point (221) bearing against a concave surface (121). A stop (15), e.g. an elastic O-ring, cable grommet, disk or foam ring, is provided for the bobbin. A stationary disk (23) can be arranged to provide an adjustable resistance to rotation. An independent claim is also included for an installation of such a bobbin support on a sewing machine with the shaft (10) vertical. The bobbin (3) positioned so that the yarn is taken directly to the first yarn guide, the lower end of the bobbin being at the height of the first yarn guide. Two bobbin holders for the upper and lower thread can be fitted.

Description

The The invention relates to a bobbin holder for thread stands for sewing machines, in particular for Gurtnähen, with a vertically arranged, essentially vertically free top-pointing pin that attaches to the stand at its lower end is, a yarn spool can be loosely attached to the receiving pin is. The invention further relates to an arrangement of a sewing machine and a thread stand with at least one bobbin and a bobbin holder.

Sewing machines, especially heavy industrial sewing machines, for sewing, for example of belts are suitable, with yarn from a yarn spool or Spool of thread supplied. The thread spool is on a thread stand a recording pin pointing essentially vertically upward attached. The yarn is fed vertically upwards from the bobbin attached to the thread stand Yarn gallows led, redirected and to the sewing machine guided. There it passes an appropriate thread guide to the sewing needle.

adversely in this known type of yarn guide and the yarn package arrangement is that when you "unwind" the sewing thread, in other words when the sewing machine is in operation or when rewinding the yarn from a spool of thread to a bobbin the spool of thread or spool of thread is hardly removed Thread is also rotated. Rather, the yarn is removed vertically upwards pulled from the spool, so that all the twists introduced during winding stay in the thread. This inevitably leads to Loops and knots, since the twists are not all with the Walk the thread into the material. The knots and loops that form in this way can lead to thread breakage and Interrupt the seam. Can too she breaks needles with destruction of the sewing material cause.

task the invention is the undesirable Loops and knots in the thread when the sewing thread is used up avoid. Can accordingly resulting thread breaks and seam breaks as well as needle breaks and possibly resulting damage be prevented.

Is solved this task with a coil holder according to claim 1 and an arrangement according to claim 9th

Thereby, that a hollow shaft is provided, the free inner diameter for freely rotatable mounting on the mounting pin and its outside diameter are designed to attach the bobbin, in the hollow shaft a support point for low-friction, freely rotatable storage the hollow shaft is provided on the locating pin, it turns smoothly Storage of the thread spool realized on the thread stand. Hence this leads Pulling from the bobbin of thread used during sewing to that the thread spool turns too. Accordingly, the sewing thread is at the coil holder according to the invention essentially unwound as it is in the assembly of the yarn package was wound up. The twists introduced when winding the yarn are essentially removed. A loop and knot formation is effectively prevented.

If the support point in the hollow shaft is adjustable in height, preferably in an internal thread of the hollow shaft, the location can of the support point in the hollow shaft to the one to be unwound on the thread stand Spool or spool can be adjusted.

A particularly low-friction, wear-free and robust storage is achieved in that the support point has a concave surface, which rests on the tip of the stylus. It arises quasi a "top storage".

If a limiting means is arranged on the cylindrical outside of the hollow shaft is up to which the thread spool can be plugged onto the hollow shaft, is the one you want altitude the thread spool attached to the hollow shaft is adjustable. Is preferred the limiting means in a radial plane on a circumferential line the hollow shaft arranged. The limiting means is one over the Hollow shaft pushed elastic, annular element, preferably a O-ring, a cable grommet or a foam ring.

Thereby, that in one as a cable grommet trained limiting means a circularly shaped disc in radial plane is held to the hollow shaft, one on the hollow shaft fixed contact surface created on which a spool of thread over the hollow shaft and from this guided is discardable. The pane can be made of acrylic glass, for example his.

For a bobbin holder with a support plate fixedly arranged at the lower end of the receiving pin, a means for generating a meterable friction is provided between the fixed support plate and the yarn spool rotatably mounted on the hollow shaft. In this way, in the event of very rapid sewing progress or when rewinding yarn onto the lower thread bobbin, when the process is stopped, an undesired run-on of the yarn bobbin rotating at a high rotational speed can be avoided or at least braked strongly. A wake of the yarn spool is critical in this respect, since many The sewing machines need a little pretension when the thread is fed. Furthermore, in the event of excessive wake, there is a risk that the hanging thread will get caught in other objects, for example the operator, the sewing machine or the sewing material, and thus in turn lead to the risk of thread breaks. A foam pad on the support plate, a foam ring on the hollow shaft, or the like are particularly suitable as means for generating a meterable friction.

The Arrangement of a sewing machine and a thread stand with at least one bobbin and a bobbin holder according to the invention is designed in such a way that it is attached to the coil holder Spool of thread in the sewing machine processing thread leads directly to the first thread guide of the sewing machine, with the thread spool its axis of rotation is arranged substantially vertically and the Thread spool at about height the first thread guide the sewing machine is arranged. This ensures that the one used during sewing Thread immediately in the substantially tangential direction from the Yarn spool - like wound up - unwound is so that a loop or knot formation is reliably avoided becomes.

Around pulling the thread over the free top of the vertically arranged yarn spool is secure to avoid is the lower end of the spool of thread at the level of the first yarn guide the sewing machine arranged. The sewing thread is thus always easy with a from the upper area of the thread spool downward slope unwound from the spool of thread.

In Another embodiment is two bobbin receptacles with bobbins on the stand are provided, one bobbin providing the upper thread and the other Bobbin for rewinding provided on a bobbin. If necessary, two different thread materials are available for the upper thread and bobbin thread. The lower thread is placed on the bobbin holder by this Thread spool first rewound onto a bobbin.

following is an embodiment of the Invention with reference to the accompanying drawings described.

In this shows:

1 in schematic side view, partly cut, a bobbin holder mounted on a thread stand.

In 1 is schematically in a partially sectioned side view of a coil holder 1 on a thread stand 2 shown.

The thread stand 2 points to a support arm 21 a free-standing, substantially vertically upward-pointing pin 22 on. At the lower end of the stylus 22 is a platter 23 fixed mounted.

The coil holder 1 has a hollow shaft 10 with an axial bore 11 on. In the hole 11 , at least in the upper section with an internal thread 111 is provided, is a grub screw or grub screw 12 screwed. The bottom of the grub screw 12 has a concave surface 121 that serves as a support point.

The hollow shaft 10 the coil holder 1 is on the stylus 22 of the thread stand 2 by inserting the stylus 22 in the hole 1 1 of the hollow shaft 10 added. The coil holder is supported 1 with its support point (concave surface 121 ) of the grub screw 12 on the top 221 of the stylus 22 in the manner of a tip storage.

This is the coil holder 1 freely rotatable and low-friction on the thread stand 2 stored. Due to the internal thread 111 the hole 11 by turning the threaded height-adjustable threaded pin 12 with its bearing point 121 can the height of the bobbin holder 1 on the thread stand 2 be fine-tuned. For example, the coil holder 1 also on pens 22 different lengths can be adjusted.

On the hollow shaft 10 the coil holder 1 is a spool of thread 3 attachable. The spool of thread 3 is in 1 only indicated by dashed lines. The outer diameter of the hollow shaft 10 is designed so that the yarn spool 3 with a little play on the hollow shaft 10 is attachable. This precaution makes changing the bobbin easier 3 ,

In order to ensure that the bobbin holder is mounted with as little oscillation as possible 1 on the thread stand 2 to ensure that the support point is located 121 preferably in the height extension in the upper third of the coil holder 1 attached bobbin 3 ,

In a further embodiment of the invention is at the lower end of the hollow shaft 10 an externally threaded section 13 provided with a left-hand thread on which a change plate 14 is engaged in the left-hand thread.

This adapter plate can be used both in the 1 shown parallel alignment to the fixed platen 23 as well as in reverse orientation on the external thread section 13 the hollow shaft 10 be put on.

Through the change plate 14 provides additional protection against unintentional unwinding of the yarn from the yarn spool 3 and possible blocking due to loose loops of thread between the bobbin holder 1 and thread stand 2 avoided.

Between change plate 14 and platter 23 an intermediate layer made of a soft, elastic material, for example foam, can be interposed as a means for producing a meterable friction. In this way, a desired braking effect can be generated, so that the spool receptacle runs on 1 after a sewing thread has been pulled off at high speed or at least braked heavily.

Furthermore, in 1 one on the cylindrical outside of the hollow shaft 10 arranged limiting means 15 in the form of a via the hollow shaft 10 shown pushed O-ring.

1

cop-taking

10

hollow shaft

11

drilling

111

inner thread

12

Threaded pin grub screw

121

Onlay points concave surface

13

Externally threaded section

14

adapter plate

15

limiting means

16

medium for generating friction

2

Beam

22

recording pen

221

Recording pen tip

23

Support plate

3

bobbin

Claims (12)

Bobbin holder for thread stand ( 2 ) for sewing machines, in particular for belt sewing, with a vertically arranged, essentially vertically freely pointing upward pin ( 22 ) at the lower end of the stand ( 2 ) is attached, with the locating pin ( 22 ) a spool of thread ( 3 ) can be attached loosely, characterized in that a hollow shaft ( 10 ) is provided, the free inside diameter ( 11 ) for freely rotatable recording on the recording pin ( 22 ) and its outer diameter for attaching the thread spool ( 3 ) are formed, with in the hollow shaft ( 10 ) a support point ( 121 ) for low-friction, freely rotatable mounting of the hollow shaft ( 10 ) on the stylus ( 22 ) is provided. Coil holder according to claim 1, characterized in that the support point ( 121 ) in the hollow shaft ( 10 ) height adjustable, preferably in an internal thread ( 111 ) the hollow shaft ( 10 ), is arranged. Coil holder according to claim 1 or 2, characterized in that the support point ( 121 ) has a concave surface on the tip ( 221 ) of the stylus ( 22 ) rests. Coil holder according to claim 1, 2 or 3, characterized in that a limiting means ( 15 ) on the cylindrical outside of the hollow shaft ( 10 ) is arranged up to which the bobbin ( 3 ) on the hollow shaft ( 10 ) can be plugged on. Coil holder according to claim 4, characterized in that the limiting means ( 15 ) in a radial plane on a circumferential line of the hollow shaft ( 10 ) is arranged. Coil holder according to claim 5, characterized in that the limiting means ( 15 ) over the hollow shaft ( 10 ) is pushed elastic, annular element, preferably an O-ring, a cable grommet or a foam ring. Coil holder according to claim 6, characterized in that that in one as a cable grommet trained limiting means a circularly shaped disc in radial plane is held to the hollow shaft. Coil holder according to one of the preceding claims with a fixed at the lower end of the receiving pin ( 22 ) arranged support plate ( 23 ) characterized in that between the fixed support plate ( 23 ) and the one on the hollow shaft ( 10 ) rotatably mounted spool of thread ( 3 ) a means ( 16 ) is provided to generate a meterable friction. Coil holder according to claim 8, characterized in that the means ( 16 ) a foam pad on the support plate, a foam ring on the hollow shaft (to generate a controllable friction) 10 ) or the like. Arrangement of a sewing machine and a thread stand ( 2 ) with at least one thread spool ( 3 ) and a coil holder ( 1 ) according to one of the preceding claims, characterized in that of the on the coil holder ( 1 ) attached thread spool ( 3 ) the thread to be processed in the sewing machine leads directly to the first thread guide of the sewing machine, the thread spool ( 3 ) is arranged essentially vertically with its axis of rotation and the thread spool is arranged approximately at the level of the first thread guide of the sewing machine. Arrangement according to claim 10, characterized in that the lower end of the bobbin is arranged at the level of the first thread guide of the sewing machine. Arrangement according to claim 10 or 1 1, characterized in that two coil receptacles ( 1 ) with spools of thread ( 3 ) on the stand ( 2 ) are provided, one bobbin providing the upper thread and the other bobbin being provided for rewinding onto a lower thread bobbin.