JPS5841918Y2 - Horizontal hook bobbin thread tension device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a bobbin thread tension device for a horizontal hook, and its purpose is to move the bobbin thread tension plate as the slit on the bobbin thread inlet side of the bobbin thread tension plate goes downward. The plate is formed so that the distance from the slit on the bobbin thread outlet side is small, and a flange portion is formed at the upper part from the slit on the bobbin thread inlet side to the slit on the bobbin thread outlet side, and the flange portion is formed on the lower surface of the slit. The bobbin thread tension spring is attached to the bobbin thread tension base plate with a vertical gap through which the bobbin thread can pass between the bobbin thread tension spring and the bobbin thread tension spring. For convenience of time, and when the bobbin thread is pulled by the needle thread during the stitch forming process, the slit I on the bobbin thread entrance side is
・So, the bobbin thread is moved downward along the slit, and at the slit on the bobbin thread exit side, the flange prevents the bobbin thread from coming off the slit, so that sewing can be performed with peace of mind. The goal is to provide the following.

The horizontal pot according to the present invention will be explained below.

In this embodiment, the thrust direction position of the so-called cover-type horizontal hook, that is, the inner hook, is regulated by the outer hook in the downward thrust direction, and the gap through which the sewing thread can pass is provided by a cover member in the upward thrust direction. A case will be described in which the present invention is applied to a horizontal hook of the type that is regulated by a cover, but is not limited to this horizontal hook of the cover type.

In FIG. 1, reference numeral 1 denotes an inner hook, and in the downward thrust direction, the lower surface 3 of the race surface 2 of the inner hook 1 is regulated by the upper surface 6 of the race surface 5 of the outer hook 4, and in the upward thrust direction, the inner hook 1 The upper surface 7 of is regulated by the back surface 9 of the throat plate 8 and the back surface 11 of the square plate 10 with a gap through which the sewing thread can pass.

The side surface of the race surface 2 of the inner hook 1 engages with the race side wall 12 of the outer hook 4 to restrict its planar position, and its rotational position is restricted by a movable rotation stopper 13, which will be described later.

A storage chamber 17 for a bobbin 39 is formed approximately in the center of the inner hook 1, and a bobbin thread tension device 18, which will be described later, is attached to the side surface of the storage chamber 17.

A screw gear 24 is integrally attached to the outer hook 4 by brazing or the like, and the screw gear is pivotally connected to a shaft 27 that is fixed 26 to the bed 25.

The movable rotation stopper 13 is pressed against a cam 28 formed below the outer hook 4 by a spring 29, with the pin 38 as the center of rotation, and is caused to swing in synchronization with the rotation of the outer hook 4, thereby locking the movable rotation stopper 13. Pieces 30 and 31 alternately cut out 3 of the inner pot.
2 and 33 to regulate the rotational position of the inner hook 1.

Thus, when forming a stitch, the sewing thread (needle thread loop) passes through the cutouts 32 and 33 in a state in which it is disengaged from the locking piece 30 or 31, respectively, and the stitch is formed.

The lower thread tension device 18 will be explained with reference to FIGS. 2 to 5.

The lower thread tension device includes a lower thread tension base plate 40 and a lower thread tension spring 41.
and a lower thread tension screw 42, and a screw 43.
The lower thread tension spring 41 is fixed to the inner hook 1 in a manner that it is held down by the lower thread tension base plate 40.

The lower thread tension base plate 40 has a slit 44 on the inlet side and a slit 45 on the outlet side for the lower thread 19, and the lower thread 19 is inserted between the slit 44 and the slit 45 into the lower thread tension spring. 41, it is pressed against the lower thread tension base plate 40 and tension is applied.

The shape of the slit 44 becomes more like a snot 4 as it goes downward.
5, so that the distance between the bobbin thread 1 and the bobbin thread 1 is small.
When tension is applied to 9, the bobbin thread is moved below the slit 44.

The bobbin thread tension screw 42 is rotatably screwed into the bobbin thread tension base plate 40 with the bobbin thread tension spring 41 in between, and by turning the bobbin thread tension screw 42, the flange portion 47 is rotated to the bobbin thread tension spring 41. The tension of the bobbin thread is adjusted.

Further, a flange portion 46 is formed on the upper part of the lower thread tension base plate 40 from the snot 44 to the slit 45, and the inner circumference of the lower thread tension spring 41 is located inside the flange portion 46 as shown in FIG. The lower thread 19 is attached to the lower surface of the flange portion with a gap G in which the lower thread 19 can enter, for convenience when setting the lower thread 19.

The bobbin thread tension device of the present invention has the above-mentioned configuration, and when the bobbin thread 19 is pulled by the needle thread during the stitch forming process, the bobbin thread 19 is pulled along the slits 1 to 1 at the entrance side slit 44. It is moved downward, and is prevented from being pulled out upward by a flange portion 46 at the slit 45 on the exit side.

As described above, in the present invention, the slit on the lower thread inlet side of the lower thread tension base plate is formed so that the distance from the slit on the lower thread exit side of the lower thread tension base plate becomes smaller as it goes downward. A flange portion is formed at the upper part from the slit on the bobbin thread inlet side to the slit on the bobbin thread outlet side, and the flange portion
By configuring the lower thread tension spring to protrude outward from the inner periphery of the lower thread tension spring attached to the lower thread tension base plate with a gap in the vertical direction through which the lower thread can pass between the spring and the lower surface thereof,
In order to facilitate the setting of the bobbin thread, when the bobbin thread is pulled by the needle thread during the stitch forming process, the bobbin thread is moved downward along the slit in the slit on the bobbin thread entrance side, The present invention provides a bobbin thread tension device for a horizontal hook in which the flange portion prevents the bobbin thread from coming off the slit on the exit side of the bobbin thread so that sewing can be performed with peace of mind.The practical effects of the bobbin thread tension device are extremely remarkable. be.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the horizontal hook according to the present invention, Fig. 2 is a perspective sectional view showing the main parts of the embodiment of the invention, Fig. 3 is a perspective view showing the lower thread tension base plate, and Fig. 4 is a perspective view showing the main part of the embodiment of the invention. FIG. 5 is a perspective view showing the lower thread tension screw, and FIG. 5 is a sectional view taken along line AA in FIG. 2. In the drawing, 1 is an inner hook, 4 is an outer hook, 18 is a lower thread tension device, 19 is a lower thread, 40 is a lower thread tension base plate, 41 is a lower thread tension spring, 44 is a slit on the lower thread entrance side, 45 is a slit on the lower thread exit side, 46 is a flange portion, and G is a gap through which the lower thread can pass.

Claims (1)

[Scope of utility model registration request] In the horizontal hook of the sewing machine, a slit on the bobbin thread outlet side is formed in the bobbin thread tension base plate, and a slit on the bobbin thread inlet side is formed so that the distance between the slit and the slit on the bobbin thread outlet side decreases as one goes downward. A flange part is formed at the upper part from the slit on the bobbin thread inlet side to the slit on the bobbin thread outlet side, and the flange part has an upper and lower surface through which the bobbin thread can pass so that the bobbin thread can be set between the flange part and the lower surface of the flange part. A lower thread tension device for a horizontal hook, characterized in that the lower thread tension device projects outward from the inner periphery of a lower thread tension spring attached to the thread tension base plate across a gap G in the direction.