JPH0665365U - Bobbin presser of bobbin thread winding device - Google Patents

Abstract

(57) [Abstract] [Purpose] To facilitate thread cutting when using a bobbin thread winding device. [Structure] A bobbin retainer provided with a blade portion s.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 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]

[Prior art]

 As shown in FIG. 1, a sewing machine is generally 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, and the rotation of the motor 3 is transmitted to the sewing machine head 2 by a belt 4. A bobbin thread winding device 5 that winds 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 table 1.

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 of the substrate, and a substrate is fixed to the rear part thereof. Two spindles 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 denotes a ring body fixed to a rotary shaft 13 inserted in a shaft hole of the bearing portion 10a, and is capable of being pressed against a belt 4 for rotating the sewing machine head 2.

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

Reference numeral 14 is a link member that connects the overhanging portion of the bearing portion 10a and the tip end portion of the operating lever 11, and is formed with the overhanging portion 15a extending toward the bobbin supporting portion 13a. The bobbin retainer 15 is fixed.

Although not shown, a spring is provided at an appropriate position for applying a force in the direction of separating the wheel 12 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 arrow f1 when not in use, and the operating lever 11 operated in this way is moved by a spring force (not shown). The position is retained. 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 overhanging portion 15a of the bobbin presser 15 is largely displaced below the bobbin supporting portion 13a, and the ring 12 is separated from the belt 4.

On the other hand, when the device 5 is used, an empty bobbin B is set on the bobbin supporting portion 13a, and the tip of the thread t guided from the other place through the thread guide 7 is used as the core of the bobbin B. After being wound several times, the operating lever 11 is swung in the direction opposite to the arrow f1 to obtain the state shown by the solid line in the figure. As a result, the arm 10 is swung around the shaft 8 so that the ring 12 is pressed against the belt 4 and the bobbin presser 15 has its overhanging portion 15a pressed onto the core of the bobbin B.

After that, 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 sequentially wound around the rotated bobbin B. Becomes

When the yarn 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 and the link member 14 is displaced against the force of a spring (not shown). When the displacement reaches a certain amount or more, the force of the spring causes the operating lever 11 to swing in the direction of 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 move. As a result, the wheel body 12 is separated from the belt 4 without requiring any manual operation, and the bobbin B stops rotating.

After that, the bobbin B is removed from the bobbin supporting portion 13a, the next empty bobbin is set on the same supporting portion as needed, and the same winding process is performed again.

[0013]

[Problems to be solved by the device]

 In the conventional bobbin thread winding device described above, each time the winding of the thread on the bobbin is completed, the scissors placed on or near the workbench should be used to remove the end of the wound thread. Since it had to be cut, this was annoying to the operator and was one of the factors that impaired 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]

[Means and Actions for Solving the Problems]

 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 thread in a procedure and a mode that allows the operator to perform efficient work.

[0016]

【Example】

 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 FIG. 1B, a triangular cutout k is provided in the overhanging portion 15a, and a cutting blade 16 having a blade portion s along the hypotenuse m below the notch k is overhanging portion. It is assumed to be fixed to 15a.

Further, FIG. 1C 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 retainers 15 described above is fixed in a manner similar to that of the conventional link member 14 of the winding device 5 shown in FIG. 2, but this cut k exists in the sewing machine head 2. It is set so that it is located on the opposite side of the side.

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

After the winding of the yarn t on the bobbin B by the winding device 5 is completed, the bobbin B is removed from the bobbin supporting portion 13a, and the next empty bobbin B1 is replaced with the bobbin supporting portion 13a. set.

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 so that the thread portion is appropriately tensioned.

After that, the operating lever 11 is oscillated to interlock the link member 14, and the overhanging portion 15a thereof is displaced to press 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 cut thread t on the empty bobbin B1 side. At the same time as this cutting, the end 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 around the last bobbin, the bobbin is removed from the bobbin supporting portion 13a, and the end portion 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, not providing another cutting blade 16 on the bobbin retainer 15 but directly providing the blade portion s as shown in FIG. 3A contributes to simplifying the structure. Will be done.

Further, in the above-described 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 convenient for thread cutting, and the notch is also provided. Positioning the blade portion s inward of k contributes to prevent the operator from being injured by the blade portion s.

[0028]

[Effect of device]

 According to the present invention described above, it is possible to easily and smoothly perform the thread cutting when winding the thread by the bobbin thread winding device without using scissors, so that the sewing machine operation is efficient. It is a squeal.

[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.