JPS58216089A - Lower yarn hook of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This invention is a book about a bobbin thread hook for a sewing machine.

Conventionally, there are two types of sewing machines: one consisting of a shuttlecock for bobbin thread, an inner hook, and a bobbin case, and the other consisting of a shirttle without a bobbin case and an inner hook, and these are used for both. The bobbin thread is wound around the bobbin and comes out.
In the case of the former case, the bobbin is pushed through a stud provided in the center of the inner case or the bobbin case, and
In the latter case, the bobbin thread is pushed through a stud provided at the center of the bobbin and is housed in the bobbin, and is unwound from the outer circumferential side of the bobbin. therefore,
In conventional hooks, the bobbin thread is wound around the bobbin and inserted through a bobbin case or a stud installed in the inner hook, so it is difficult to maintain a constant tension on the bobbin thread as it is pulled out from the hook. It is also extremely difficult to adjust the lower thread tension spring, so the upper thread tension must be adjusted to match the lower thread tension.
When the sewing machine stops, the bobbin may overrun or catch the bobbin thread in the center.Especially in the case of chidori stitches, the bobbin often overruns and is likely to get caught, so special brakes are required. In addition, since the bobbin thread is unwound onto the bobbin and pulled out from the outer periphery of the bobbin, the position at which the bobbin thread is pulled out relative to the bobbin constantly fluctuates, causing the bobbin thread to become loose inside. This may cause problems such as the bobbin thread coming off from the pull-out hole and the bobbin thread guide groove, and coming off the tension spring.Also, when the thread wound around the bobbin decreases, the tension on the bobbin thread from the bobbin is almost gone, and the tension is only applied to the tension spring. However, there was a drawback that the seams were too tight at about 2'7 and the spring was good.

The present invention has been made to eliminate the above-mentioned conventional drawbacks,
This is a sewing machine in which the bobbin of the bobbin thread is removed, the bobbin thread is made into a cake and stored in a bobbin case or inner hook, and the bobbin thread is pulled out from the inside edge of the cake to improve stitching and thread binding. The purpose is to provide a threader for bobbin threading.

Next, an alternative embodiment of the present invention will be described with reference to Figs. 14 and more barking.

Reference numeral 2 denotes a conventionally known shuttlecock for guarding the outer peripheral body of the rotary hook 1 described above, and a running groove 3 for the inner rotary hook 5 is formed on the inner circumferential surface of the shuttlecock 1. Almost 1/
The second range is formed in an open shape, and a middle presser foot 4 is attached to the open part to form a running groove 6.

Reference numeral 5 includes the above-mentioned conventionally known inner core, the body wall 6 of which is formed into a substantially cylindrical shape that can be fitted into the shirt handle 2, and a bobbin thread presser piece 7 on one opening side of the body wall 6. A hook stopper 8 is formed in a protruding manner on the upper side of the opening in which the other bobbin thread case 14 is fitted, and a flat surface 9 on the left side of the hook stopper 8 is provided with a hook stopper 8. A lower thread pull-out groove 10 is recessed. Furthermore, a race 11 is formed on the shuttlecock 2 and slidably fitted into the nine-way bay 6 over a predetermined range approximately at the center of the outer circumference of the trunk wall 6. Further, a locking recess 12 for regulating attachment of the bobbin thread case 14 is formed in a part of the periphery of the opening on which the bobbin thread case 14 is fitted.

Reference numeral 14 denotes a bobbin thread case that is removably inserted into the inner hook 5, and is composed of a cylindrical portion 15 that is inserted into the inner hook 5 and a lid portion 16, and is formed on the outer surface (front surface) of the lid portion 16. A locking piece 18.18 is movably fitted into the dovetail-shaped sliding groove 17, and a pressure spring 19 is fitted between the locking pieces 18.
The locking piece 18 is biased toward the inner peripheral surface of the inner hook 5, and the same piece 1
A protrusion 18& provided at the end of the inner pot 8 is configured to engage with a fourth portion 5Ia formed on the inner pot 5. Also,
A retaining piece 20 is screwed onto the lid portion 16 and is fitted into a locking recess 12 formed in the inner hook 5 to position the bobbin thread case 14. Further, a threaded hole 22 for attaching a tension spring 25 is screwed into a 1/4 circumferential portion 21 on the lower left side of the cylindrical portion 15 in the figure, and a bobbin thread pull-out hole 23 is provided with a protrusion. 23 (In this case, the thread path 24 that guides the bobbin thread 28 to the pull-out hole 23 is cut diagonally, and the outer periphery of the same part 21 has a tension l.)
125 is completely screwed in via the adjusting screw 26.

When the outer circumference of the barrel wall 6 of the inner hook 5 is inserted into the running groove 6 of the bolt 2, the inner hook 4 is pressed into place. Once installed, the inner hook 5 is slidably attached to the running path groove 3, and the bobbin thread case 14 is inserted into the inner hook 5. A cylindrical bobbin thread storage portion 27 is formed in which a cake-like bobbin thread without intervening protrusions can be accommodated.

Reference numeral 28 denotes a bobbin thread to be stored in the bobbin thread storage section 27. The bobbin thread 28 is wound around a pobbin 29 in a cake shape that can be stored in the bobbin thread storage section 27. The pobbin 29 is pulled out and stored, and the cake-shaped bobbin thread 28 has its inner circumferential spring starting end 28a directed toward the lid 16011I of the bobbin thread case 14, that is, the opposite side of the open end of the thread path 24, as shown in the figure. Pulled out and the same starting end 28 JL, side is thread path 2
4 to the lower thread pull-out hole 23, and from the pull-out hole 23, passes under the tension bar 25 and is led out from the lower thread pull-out groove 10 of the inner hook 5.

Next, a second embodiment of the present invention will be described with reference to FIGS. 9 to M15. This hook 30 is a hook 30 that does not use the bobbin thread case 14 illustrated in the @1 embodiment, and is composed of a fully rotating shuttlecock 31 and an inner hook 65. This shirt toll 31 is a conventionally known one, and consists of two members: a mounting boss portion 32 and a shirt toll portion 33. A sliding recess 64 into which an inner hook is fitted is provided on one inner peripheral edge of the shirt toll portion 33. . 65 is a hollow hook that also serves as a bobbin thread case, and the inner hook main body 36. It is composed of a race member 51 and a pressing member 52.

Reference numeral 66 denotes a main body of the inner hook, the body wall 37 of which is formed in a substantially cylindrical shape that can be fitted into the shuttlecock 31, and one opening side of the body wall 37 of the body wall 37 along the IK radius line. A bobbin thread presser piece 58 is provided, and one end side of the bobbin thread presser piece 38 is formed into a bifurcated shape as shown in the figure, and a hook portion 69 that protrudes from the outer periphery of the trunk wall 37 is formed.
One lower thread guide hole 41 is provided in one of the wide claw bodies 40 shown in the drawing. Further, a part of the outer periphery of the opening side of the barrel M37 has an arc-shaped tapered part 42 as shown in the figure, and a lid body 56 can be attached to the inner periphery of the opening side. is formed. Further, a screw hole 4 for attaching a tension spring 48 is provided in a 1/4 circumferential portion 44 on the left side in the drawing of the trunk wall 37.
At the same time, a bobbin thread pull-out hole 46 is formed through the bobbin thread pull-out hole 46, and a thread path 47 for guiding the bobbin thread 28 to the pull-out hole 46 is cut in a dogleg shape as shown in the figure. Same 1/4 circumferential part 44
A tension spring 48 is screwed onto the outer periphery of the spring through an adjustment screw 49. Further, a lace member 5 is provided on the outer circumferential portion of the trunk wall 67 on the side where the bobbin thread presser piece 68 is provided over a predetermined range.
A protruding strip 50 is provided in a protruding manner to which the holder 1 is attached.

Reference numeral 51 denotes a lace member which is engaged with the protrusion 50 of the trunk wall 37 and fitted into the sliding recess m1% of the shirt handle 61;
As shown in the figure, it is formed in a ring shape along the protrusion 50 with a cross-sectional shape.

52 This is a holding member for the lace member 51, and is made of a spring plate or the like, and is formed into a substantially triangular shape so as to be able to hold the lace member 51 as shown in the figure, and corresponds to one vertex of the triangular shape. Each pair has a retaining piece of 53.5
4 is formed. In this way, the formation force, the trunk wall 67
The lace member 51 is fitted and engaged along the protrusion 50 of the thread, and the presser member 52 is screwed onto the bobbin thread presser piece 38 with the screw 55, so that the lace member 51 is integrally assembled. There is. Reference numeral 56 denotes a lid body that closes one opening side of the inner pot main body 66, and is made of synthetic resin or the like and is formed so as to be able to be elastically fitted onto the stepped portion 46 formed on the same opening side. When the body 56 is elastically engaged with the stepped portion 46 of the inner hook main body 36, a cylindrical bobbin thread storage portion 57 is formed in which a cake-shaped bobbin thread without any protrusions interposed therein can be accommodated.

In the bobbin thread accommodating portion 57 of the inner hook 65 which has been formed in this way, the cake-shaped bobbin thread 28 similar to that of the first embodiment is wrapped around the bobbin thread presser piece 68 as shown in the figure. That is, the starting end 28a is pulled out to the side opposite to the open end of the thread path 47, and is guided from the thread path 47 to the bobbin thread pull-out hole 46, and then passed from the pull-out hole 46 under the tension tensioner 48 to the bobbin thread guide hole 41. There is hot water coming out.

A lid 56 is attached to the storage portion 57 in which the bobbin thread 28 is stored, and the inner hook 35 is fitted into the shirt handle 31. h or inside ≠; I/i' screw member attached to other members to prevent it from deviating from the shuttlecock
(not shown) is pressed down from K.

In addition, the above 1. In the second embodiment, the shuttlecock 2.31 is exemplified as one that rotates fully, but it may also rotate half a rotation.

Now, as described above, the present invention provides a bobbin thread storage section that stores the inner hook and bobbin thread case or only the inner hook in a fit-fitting manner in the shuttlecock, and provides a bobbin thread storage section without any protruding objects inside the shuttlecock. A cake-shaped bobbin thread is stored in the thread storage portion, and the bobbin thread is led out from the spring-like starting end side of the inner peripheral portion. Therefore, the bobbin thread is not wound around the bobbin as in the past, but is derived from the winding start end on the inner peripheral side of the cake, eliminating the possibility of the bobbin thread getting caught due to overrun of the bobbin. At the same time, special braking means for the bobbin can be eliminated. Furthermore, since the bobbin thread is not wound onto the bobbin and attached to the bobbin, the amount of time the bobbin thread is stored in the bobbin thread storage section can be increased. Also,
Since there is no bobbin, it is easy to adjust the tension of the bobbin thread, and since tension is applied to the bobbin thread only by the pressing force of tensions l and f, the tension is near the end of the bobbin thread. Also, since the bobbin thread tension is constant, defects at the end of the sweep can be prevented. In addition, since the bobbin thread is led out to the opposite side of the cake-shaped inner weft thread path open end, the thread can be pulled out easily and can be prevented from coming off the tension spring.
Moreover, the operation of the needle thread take-up is improved and its operation noise is reduced.

In addition, if a multi-embroidery sewing machine has a bobbin, the tension of the bobbin thread changes due to changes in the diameter of the bobbin thread, so the percentage position must be stopped and adjusted each time, but in the present invention, the IdT Since the tilting force of the thread can be made constant, it is also suitable for multi-needle embroidery sewing machines, and its contribution is extremely large.

[Brief explanation of the drawing]

Figures 1 through 8 show the first embodiment of the present invention, in which Figure 1 is a front view of the hook with the bobbin thread case, Figure 2 is a cross-sectional view, and Figure 5 is the inner hook. Figure 4 is a side view, Figure 5 is a plan view, Figure 6 is a front view of the bobbin thread case, Figure r7 is a sectional view 1-11 of Figure 6, and Figure 8 is a front view of the bobbin thread case.
The figure is a schematic diagram of the bobbin thread, Figures 9FY9 to 15 show the second embodiment of the present invention, Figure 9 is a front view of a hook without a bobbin thread case, and Figure 10 is a sectional view of the shuttlecock. Figure 11 is a front view of the inner pot, Figure 12 is a vertical sectional view, and Figure 13 is a longitudinal sectional view.
The figure is a front view of the inner hook main body, FIG. 14 is a plan view, and FIG. 15 is a side view. 1.50... Hook 2,61... Shirttle 5.65... Inner hook 14... Bobbin thread case 27
, 57...Lower thread storage section 28...Lower thread 28a...
Applicant: Tokai Goki Kogyo Co., Ltd.
Patent Attorney Oka 1) Hidehiko No. 5 Fig.□ No. e) Fig. 19 b Fig. 7 Fig. s9

Claims (1)

[Claims] The inner hook and the bobbin thread case or only the inner hook are fitted into the shirt handle to form a bobbin thread storage section with no protruding objects inside, and a cake-shaped bobbin thread is stored in the bobbin thread storage section. , and a structure II'i in which the bobbin thread is led out from the winding i or the starting end side of the inner periphery thereof.