JPH0642627Y2 - Bobbin presser of bobbin thread winding device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bobbin retainer used in a bobbin thread winding device used as a lower thread of a sewing machine.

[0002]

2. Description of the Related Art Generally, a sewing machine is provided with a sewing machine head 2 on the upper surface side of a workbench 1 and a motor 3 on the lower surface side thereof, as shown in FIG.
A bobbin thread winding device 5 configured to wind a thread used as a lower thread of the sewing machine around a bobbin may be provided at a position near the belt 4 on the workbench 1 or the like.

An example of the winding device 5 will be described with reference to FIG. 2. Reference numeral 6 denotes a substrate fixed on the workbench 1, a yarn guide 7 is fixed to the front part thereof, and a yarn guide 7 is fixed to the rear part thereof. Two support shafts 8 and 9 are mounted. An arm 10 having a bearing portion 10a is swingably mounted on one shaft 8, and an operating lever 11 is swingably mounted on the other shaft 9.

Reference numeral 12 is a ring body fixed to a rotary shaft 13 inserted into the shaft hole of the bearing portion 10a, and can be pressed against a belt 4 for rotating the sewing machine head 2.

Reference numeral 13a is a bobbin supporting portion formed at the tip of the rotary shaft 13.

Reference numeral 14 designates a link member which connects the overhanging portion of the bearing portion 10a and the tip end portion of the operating lever 11 to the overhanging portion 1 extending toward the bobbin supporting portion 13a.
The bobbin retainer 15 having the formed 5a is fixed.

Although not shown in the drawings, the wheel 1 is located at an appropriate position.
A spring is provided for applying a force in the direction of separating the belt 2 from the belt 4 to the arm 10 or the like.

The winding device 5 is in a state in which the operating lever 11 is oscillated and displaced in the direction of the arrow f1 when not in use, and the operating lever 11 operated in this way is moved to its position by a spring force (not shown). Be held. In this case, the bearing portion 10a is in a state of being largely swung around the shaft 9 via the link member 14. Therefore, the bobbin presser foot 15
The overhanging portion 15a is largely displaced below the bobbin supporting portion 13a, and the wheel 12 is separated from the belt 4.

On the other hand, when using the device 5, the empty bobbin B is set on the bobbin supporting portion 13a, and the tip end of the thread t guided from the other place through the thread guide 7 is applied to the core of the bobbin B a plurality of times. After winding, the operation lever 11 is swung in the direction opposite to the arrow f1 to obtain the state of the solid line in the figure. As a result, the arm 10 is swung around the shaft 8 so that the wheel 12 is pressed against the belt 4 and the bobbin presser 15 has its overhanging portion 1.
5a is pressed against the core of the bobbin B.

Thereafter, when the belt 4 is circularly displaced, the ring 12 is rotated, this rotation is transmitted to the bobbin B via the rotation shaft 13, and the yarn t is successively wound around the rotated bobbin B. Become.

When the thread t is wound and the diameter of the bobbin B is increased, the bobbin presser 15 is gradually pushed down via the overhanging portion 15a to displace the link member 14 against the force of a spring (not shown). When this displacement reaches a certain amount or more, the force of the spring swings the operating lever 11 in the direction of the arrow f1 in connection with the change in the relative arrangement of the spring and each member such as the arm 10. It will act to let you. As a result, the ring 12
Is separated from the belt 4 without any manual operation, and the bobbin B is stopped from rotating.

Thereafter, the bobbin B is moved from the bobbin supporting portion 13a to the bobbin B.
Then, if necessary, the next empty bobbin is set on the same support portion, and the same winding process is performed again.

[0013]

In the above-mentioned conventional bobbin thread winding device, each time the bobbin thread winding process is completed, the scissors placed on or near the workbench are used to hold the bobbin thread winding device. The end of the wound yarn must be cut, which is unexpectedly troublesome for the operator and is one of the factors that impair the work efficiency. In view of such circumstances, an object of the present invention is to provide a bobbin presser for a bobbin thread winding device that can reasonably cut the thread without using scissors.

[0014]

In order to achieve the above object, the present invention provides a bobbin retainer in which a thread cutting blade is provided on one side surface of a bobbin retainer overhanging portion for bobbin winding.

According to this, the blade portion enables the worker to cut the yarn in a procedure and a mode that allows the operator to perform efficient work.

[0016]

FIG. 3 shows an embodiment of the bobbin presser 15 according to the present invention.

In FIG. 1A, a cutout k is provided in the overhanging portion 15a and a circular blade portion s is formed in the innermost portion.

Further, in the case of FIG. 2B, a triangular cut k is provided in the protruding portion 15a, and the cutting blade 16 having a blade portion s formed along the hypotenuse m below the notch k is protruded. 1
It is assumed to be fixed to 5a.

Further, FIG. 3C shows a cutting blade in which a projecting portion 15a is provided with a triangular notch k having two oblique sides m and n and a blade portion s is formed along the upper oblique side n. 16 is fixed to the projecting portion 15a.

Each of the bobbin pressers 15 described above is fixed to the link member 14 of the winding device 5 shown in FIG. 2 in the same manner as the conventional one, but the cut k is on the side where the sewing machine head 2 is present. It is set so that it is located on the opposite side of.

The bobbin presser 15 of the present invention thus fixed is used as follows, for example.

After the winding device 5 finishes winding the yarn t on one bobbin B, the bobbin B is removed from the bobbin supporting portion 13a, and the next empty bobbin B1 is set on the bobbin supporting portion 13a. To do.

Next, as shown in FIG. 4, the end of the thread t wound on the removed bobbin B is wound around the core of the empty bobbin B1 a plurality of times, and then the bobbin presser 15 is cut. The thread portion in which the two bobbins B and B1 are connected is inserted into the notch k, and then the bobbin B is pulled to bring the thread portion into a state in which it is properly tensioned.

After that, the operating lever 11 is oscillated to interlock the link member 14, and the overhanging portion 15a thereof is displaced so as to be pressed against the core of the empty bobbin B1. At this time, the overhanging portion 15a is displaced in the direction of the arrow f2, but this displacement causes the blade portion s to cut the optimum position of the thread t, and the end portion of the cut thread t on the empty bobbin B1 side. Simultaneously with this cutting, is pressed onto the core of the bobbin B1. After that, the thread t is wound around the bobbin B1 as in the conventional case.

When the yarn is wound on the last bobbin, the bobbin is removed from the bobbin supporting portion 13a, and the end of the wound yarn t is inserted into the notch k as shown by an imaginary line t1. Then, pull the bobbin to cut it.

In the present invention, the bobbin retainer 15 has a separate cutting blade 1
Providing the blade portion s directly as shown in FIG. 3 (a) rather than fixing 6 contributes to simplifying the structure.

Further, in the above embodiment, the bobbin presser 15 is fixed so that the notch k is located on the side opposite to the side where the sewing machine head 2 was present, which is not convenient for thread cutting, and the notch k Positioning the blade portion s inward contributes to prevent the operator from being injured by the blade portion s.

[0028]

According to the present invention described above, it is possible to easily and smoothly perform thread cutting when winding the thread by the bobbin thread winding device without using scissors, and to efficiently perform the sewing work. It is a target.

[Brief description of drawings]

FIG. 1 is a front view of a sewing machine.

FIG. 2 is a view showing a bobbin thread winding device equipped with a conventional bobbin retainer.

FIG. 3 shows a bobbin presser according to the present invention, (a)
(B) (c) is a figure which shows each of a different aspect.

FIG. 4 is a view showing an example of use of the bobbin retainer of the present invention.

[Explanation of symbols]

 k notch m and n hypotenuse s blade part 1 workbench 5 winding device 6 substrate 7 thread guide 8 and 9 support shaft 10 arm 10a bearing part 11 operating lever 12 wheel body 13 rotary shaft 13a bobbin support part 14 link member 15a overhang Department

Claims (1)

[Scope of utility model registration request] 1. A bobbin presser for a bobbin thread winding device, wherein a bobbin presser for bobbin winding is provided with a thread cutting blade on one side surface thereof.