JPH036296Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention includes an outer hook that is rotatably supported around an axis perpendicular to the bed of a sewing machine, and is supported in the outer hook, so that the remaining amount of bobbin thread can be monitored from the outside. In a type of sewing machine equipped with a thread loop catcher having an inner hook that accommodates a bobbin configured as described above, the amount of thread in the bobbin can be monitored without opening the throat plate or a slide plate disposed on the side thereof. The present invention relates to a bobbin thread remaining amount monitoring device for a sewing machine.

Prior Art Conventionally, this type of device has a through hole formed in a sliding plate immediately above a thread loop catcher supported on a sewing machine bed, and a transparent plate made of a transparent material such as synthetic resin is inserted into the through hole. There was one that was fixed so that it formed the same surface as the sliding surface of the sliding plate. In this device, the user of the sewing machine can visually observe the amount of thread in the bobbin stored in the thread loop catcher located below the slide plate from the outside through the transparent plate. However, with this device, as the sewing machine is used repeatedly, the processed cloth slides on the sliding plate, causing scratches on the transparent plate, and as the scratches gradually increase, the transparency of the transparent plate decreases. This had the disadvantage that it was difficult to visually check the amount of thread on the bobbin.

Purpose This invention was made in order to eliminate the drawbacks of the conventional ones, and the purpose is to keep the transparent plate in good condition at all times by removably installing the transparent plate on the closing plate such as a sliding plate. To provide a bobbin thread remaining amount monitoring device for a sewing machine capable of monitoring the bobbin thread remaining amount.

Embodiment Hereinafter, an embodiment of this invention in a two-needle needle feed lockstitch sewing machine will be described in detail with reference to FIGS. 1 to 4.

In the figure, the bed 1 of the sewing machine has an opening 2 formed therein, and a throat plate 3 is attached to the opening 2 with screws 4.Furthermore, on both sides of the throat plate 3 there are slides as closing plates. A plate 5 is supported so as to be slidable left and right in FIG. 1 so as to be able to open and close the opening portion 2. This throat plate 3 is provided with a pair of left and right holes 31 extending in the cloth feeding direction.
The feed dog 6 enters this hole 31 and performs a known feed movement. Further, a pair of left and right needle holes 7 are bored in the feed dog 6, into which a pair of left and right needles 21 can enter. Here, as shown in FIG. 2, below the sliding plate 5 in the opening 2 of the bed 1,
The shafts 11 of a pair of thread ring catchers 10 are respectively supported on the bed 1 so as to be rotatable about vertical axes with the feed dog 6 in between. An outer hook 12 is installed at the upper end of the shaft 11, and an inner hook 13 is rotatably supported on the outer hook 12. Inside the inner hook 13 is a bobbin on which a bobbin thread 14 is wound. 15
is accommodated.

Further, the bobbin 15 has a flange portion 151 thereof.
A small hole 152 is bored in the hole 152, and the sewing machine user can visually check the remaining amount of the bobbin thread 14 through this small hole 152. Incidentally, the inner hook 13 is always prevented from rotating together with the outer hook 12 by a known inner hook locking device.

By the way, a recess 55 that opens downward and is larger than the outer hook 12 of the thread ring catcher 10 is formed on the lower surface of the sliding plate 5 located above the thread ring catcher 10. Said thread ring catcher 10
can be arranged close to the upper surface of this sliding plate 5.

In addition, the sliding plate 5 where this recessed portion 55 is located has the following features:
A tapered first through hole 56 is formed to face the bobbin 15 housed in the inner hook 13 of the thread loop catcher 10 and to expand downward. Note that this first through hole 56 is not limited to a tapered shape;
Any cross-sectional shape that expands downward may be used.

Here, the transparent plate 20 is formed of a transparent material such as synthetic resin so as to have a cross-sectional shape that matches the first through hole 56, and is
6 can be fitted from below.

Further, as shown in FIGS. 2 to 4, a thin plate-shaped support plate 8 that fits into the recess 55 is arranged below the sliding plate 5 adjacent to the recess 55. Reference numeral 8 denotes a small screw 9 as a mounting means for attaching the thread ring catcher 10 to the upper surface of the sliding plate 5 without preventing the thread ring catcher 10 from being placed close to the top surface of the sliding plate 5 on the outside of the portion facing the thread ring catcher 10.
It is removably attached to the recess 55 of the sliding plate 5 by means of a screw. As is clear from FIG. 4, this support plate 8 is provided with a second through hole 81 having a diameter slightly smaller than the diameter of the lower portion of the first through hole 56. When the transparent plate 20 is fitted into the first through hole 56 of the sliding plate 5 from below, the periphery of the transparent plate 20 is engaged with the peripheral edge of the second through hole 81 of the support plate 8. At the same time, the transparent plate 20 can be held on the sliding plate 5.

Next, the operation of the lower thread remaining amount monitoring device for the sewing machine configured as described above will be explained.

First, with the slide plate 5 on the bed 1 opened, the bobbin thread 14 is placed in the inner hook 13 of the thread loop catcher 10.
Replenish the wound bobbin 15. Thereafter, by closing the sliding plate 5, it is possible to visually observe the remaining amount of the bobbin thread 14 on the bobbin 15 from the outside through the transparent plate 20. When the sewing machine is operated in this state, the transparent plate 20 gradually gets scratched depending on the usage time, and its transparency decreases, making it difficult to visually check the remaining amount of bobbin thread 14 on the bobbin 15. Become. In this state, the user can replace the old transparent plate 20 with a new one by loosening the machine screws 9 from the sliding plate 5 and removing the support plate 8.

In the above-mentioned embodiment, the transparent plate 20 etc. were attached to the slide plate 5, but in this invention, a transparent plate 20 etc. is attached to the throat plate in a sewing machine having a thread loop catcher directly below the throat plate. A plate 20 or the like may be added.

Effects As explained above, in the present invention, since the transparent plate 20 is removably installed on the closing plate 5, the transparent plate 20 is always attached to the closing plate 5.
The transparency of the bobbin 15 can be maintained constant, and the remaining amount of the bobbin thread 14 on the bobbin 15 can be visually observed in good condition.

Furthermore, a recess 55 larger than the outer hook 12 of the thread loop catcher 10 is formed on the lower surface of the closing plate 5, and at the same time,
The support plate 8 fixed in the recess 55 holds the transparent plate 20, and the support plate 8 is attached to the closing plate 5 by the attachment means 9 on the outside of the portion facing the thread loop catcher 10. Since the thread ring catcher 10 is attached to the upper surface of the closing plate 5, the thread ring catcher 10 can be placed close to the upper surface of the closing plate 5. For this reason, the thread ring catcher 1
It is possible to reduce the amount of thread loop taken out due to thread zero, and it is possible to form stitches with good thread tightness.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment embodying the present invention, Fig. 2 is an enlarged sectional view taken along the line A-A in Fig. 1, Fig. 3 is a back view showing only the sliding plate, and Fig. 4 is a plan view showing an embodiment of the present invention.
The figure is an enlarged sectional view taken along the line B-B in FIG. 3. In the figure, 1 is the bed of the sewing machine, 2 is the opening, 5 is the sliding plate (closing plate), 8 is the support plate, 9 is the machine screw (attachment means), 10 is the thread loop catcher, 12 is the outer hook, and 13 is the inner hook. A hook, 15 a bobbin, 20 a transparent plate, 55 a recessed part,
56 is a first through hole, and 81 is a second through hole.

Claims (1)

[Claims for Utility Model Registration] 1. A sewing machine bed 1 in which an opening 2 is formed, and an outer hook 1 rotatably supported around a vertical axis at the opening portion 2 with respect to the bed 1.
2, and a bobbin 1 supported in the outer hook 12 so that the remaining amount of bobbin thread can be monitored from the outside.
A thread loop catcher 10 having an inner hook 13 that accommodates a thread loop catcher 10
a closing plate 5 which is removably installed on the bed 1 and can close the opening 2; In order to allow close arrangement to the upper surface of the closure plate 5, a recess 55 larger than the outer shape of the thread ring catcher 10 is formed, and the thread ring catcher 10 is formed on the closure plate 5 where the recess 55 is located. a first through hole 56 that is formed to penetrate opposite to the bobbin 15 and has a cross-sectional shape that widens below the closing plate 5;
a transparent plate 20 formed in a cross-sectional shape that matches the first through hole 56 so as to be fitted and held from the lower side of the closing plate 5 into the first through hole 56; and the transparent plate 20 in the first through hole 56, a support plate 8 is disposed in the recess 55 of the closing plate 5, and a central portion of the support plate 8 allows monitoring of the remaining amount of bobbin thread. While the second through hole 81 is formed,
The peripheral edge of the second through hole 81 is the transparent plate 2
0 to hold the transparent plate 20 on the closing plate 5; 5. A bobbin thread remaining amount monitoring device for a sewing machine, characterized in that a mounting means 9 is provided for detachably mounting the bobbin thread remaining amount monitoring device on the sewing machine. 2. The bobbin thread remaining amount monitoring device for a sewing machine according to claim 1, wherein the first through hole 56 is formed in a tapered shape.