JPS594630Y2 - horizontal hook of sewing machine - Google Patents

Description

[Detailed description of the invention] The present invention relates to a needle hook clearance adjustment device for a horizontal hook of a sewing machine, which allows the inner hook to be easily attached and detached like a conventional vertical hook, and also allows the inner hook to be rotated around the inner hook. The thread ring catching part of the moving outer hook is made partially movable relative to the outer hook body, so that the gap between the needle and the thread ring catching part (so-called needle-to-cart gap) can be easily adjusted. This is how it was done.

Traditionally, horizontal hooks are quiet, the bobbin can be easily attached and removed, the amount of bobbin thread remaining on the bobbin is easily visible from the outside, and it is possible to wind the bobbin without taking out the bobbin. Since the diameter of the hook is large and it is suitable for full rotation, the circumferential speed of the hook is high, so the intersection conditions between the needle and the hook are good. Therefore, wide zigzag stitches are possible, vibration of the sewing machine can be easily eliminated, etc. It is used in some sewing machines because of its advantages.

However, the horizontal hooks of sewing machines that have been proposed so far have the following drawbacks, and are still outdated in practical terms compared to vertical half-rotation hooks or full-rotation hooks.

In other words, if thread bite occurs in the hook due to some kind of trouble, it is necessary to take out the inner hook and clean the lace surface of the hook, but this is extremely difficult as the inner hook is attached with a screw or the like and cannot be easily removed. It's inconvenient.

An open-close type has also been proposed, but when it is closed, a lid-like member covers the center of the hook or the entire hook, making it impossible to visually check the amount of bobbin thread remaining on the bobbin from the outside. In other methods, the race surface of the outer hook has a U-shaped cross section, and only a portion of the outer circumference of the inner hook is formed so that it can be engaged with this race surface. In this case, when installing the inner pot, it is necessary to match the inner pot to a specific phase, which requires considerable skill.

Another drawback is that it is more difficult to adjust the gap between the needle and the hook than with a vertical hook.

That is, with a vertical hook, adjustment can be easily made by changing the position of the hook with respect to the lower shaft, but with a horizontal hook, the thread ring catcher rotates on a horizontal plane that is approximately perpendicular to the direction of movement of the needle.
Since the outer hook must be moved in the radial direction, a bearing 3 is provided to support both the lower shaft 1 and the hook shaft 2, as shown in FIG. A cylindrical boss portion 3a is provided, and the boss portion is usually fixed to the sewing machine frame with a screw or the like, and is rotatable as necessary. 4
is moved in the radial direction as shown by the arrow to adjust the distance between the needle 5 and the tip of the hook.The bevel gear 7 becomes a planetary gear with the bevel gear 6 as a sun gear, and there is no problem in meshing these gears. However, it is structurally large, the distance between the tip of the hook and the center of rotation for adjustment (the center of the lower shaft 1) is large, and the mass of the adjustable part is large, so it is not only difficult to make fine adjustments, but also expensive. It has the following drawbacks.

The present invention has been made to eliminate the drawbacks of the conventional products as described above, and will be explained below with reference to the drawings.

In FIGS. 1 and 2, 4 is an outer hook, which has a thread loop catcher 8 and rotates fully around a hook shaft 2 that is substantially perpendicular to the sewing machine frame 9. The hook 10 is placed on the race portion 4a of the outer hook 4, and its movement in the axial and rotational directions is restricted so that it remains stationary even when the outer hook 4 rotates.

10a is a part that accommodates the bobbin, a bobbin thread tension adjustment spring 11 is attached around the accommodating part 10a, and on the left side of the figure there is a raised part from the upper end 10b of the accommodating part 10a to the flat part 10C. A portion 10d is formed.

Another raised portion 10 is formed independently on the clockwise end portion 10e of the raised portion 10d and the flat portion 10C.
The rotational movement of f is restricted by a rotation restriction member 12.13.

The regulating members 12 and 13 each have a screw 14 attached to the sewing machine frame 9.
One regulating member 12 restricts the clockwise rotation of the inner pot 10, and the other regulating member 13 limits the counterclockwise rotation, and these are fixed to the inner pot 10 as shown in FIG. It is placed with a gap h larger than the maximum diameter of the yarn used from the flat portion 10C of the outer hook 4 and the upper surface 4C of the flange portion 4b of the outer hook 4, and also restricts the movement of the inner hook 10 in the axial direction.

Reference numerals 15 and 16 indicate opening/closing members, which restrict the movement of the inner hook 10 in the axial direction and are rotatable around a pin 17 fixed to the sewing machine frame 9.

Regulation part 15a. 16a faces the outer hook 4 and the inner hook 10 with an appropriate arc length, and these regulating portions 15a, 1
6. Lower surface of a and outer pot 4. The gap between the inner pot 10 is 3rd
It is similar to the figure.

A pin 18 is used to determine the opening/closing position of the opening/closing member 16, and is pushed through a spring 19 into a blind hole 16C provided upward from the bottom surface of the rib 16b of the opening/closing member 16. The lower end 18a thereof is always pressed downward by the sewing machine frame 9, and its lower end 18a engages with positioning recesses 9a and 9b provided in the sewing machine frame 9.

This structure also applies to the opening/closing member 15.

Next, the outer pot 4 will be explained.

In FIGS. 5 and 6, the outer hook 4 is divided into a main body 4d and a thread ring catcher 8, and a counterbore 4f is formed on the bottom surface 4e of the outer hook 4 as shown in FIG. hole 4g and hole 4h
is provided.

The thread ring catching part 8 is formed as shown in FIG. 6, and a tip 8b is provided at the counterclockwise end of the lace part 8a, which is equal to the lace part 4a of the outer hook 4, and a tip 8b is provided on the flange part 8C. It is formed similarly to the flange portion 4b of No. 4.

Reference numeral 8a designates a mounting portion for the outer hook 4, which is provided in the center of an arcuate long hole 8e, and a pin 8g is implanted in one end 8f, and the pin 8g is fitted into the hole 4h of the outer hook 4. The thread ring catching section 8 can be rotated about the hole.

That is, the elongated hole 8e is connected to the screw 20, which is an example of a fastening element.
The thread ring catching part 8 is fixed to the main body 4d via the thread ring catching part 8, but by loosening the screw, the thread ring catching part 8 is fixed to the main body 4d by the difference between the outer diameter of the screw 20 and the length of the elongated hole 8e. The hook tip 8b can be displaced in the radial direction of the outer hook 4, so that the needle-to-hoot clearance δ shown in FIG. 4 can be adjusted.

Note that the thread ring catching section 8 may be of a sliding type instead of a rotating type with respect to the outer hook body 4d.

Next, the operation of the present invention will be explained.

First, we will explain how to open and close the pot and how to attach and detach the inner pot 10.
Place the inner pot 10 into the outer pot 4 as shown in FIG.
5 and 16 are closed, a bobbin is placed in the bobbin accommodating portion 10a of the inner hook 10, the sliding plate is closed, and the sewing machine is rotated.The inner hook 10 rotates due to the regulating member 12.13 and then remains stationary. The hook 4 rotates counterclockwise and normal sewing is performed.

At this time, the inner pot 10 is simply placed on the lace portion 4a of the outer hook 4, but due to its own weight, it is always lightly pressed against the lace portion 4a of the outer hook 4, and occasionally if it floats up, is restricted from upward movement by the regulating member 12.13 and the opening/closing member 15.16, and is maintained in a stable stationary state even if the outer hook 4 rotates at high speed.

To take out the inner hook 10, first stop the sewing machine, pull the sliding plate toward you to open it, open the opening/closing members 15 and 16 in the direction of the arrow in Fig. 2, and check the rotational position at which the outer hook 4 is stopped. All you have to do is grab the inner pot 10 and pull it diagonally upward and toward you.

Thereby, the inner hook 10 can be easily taken out without moving the throat plate and the regulating members 12, 13 at all.

Therefore, the lace portion 4a of the outer pot 4 and the area around the inner pot 10 are cleaned.

Next, to install the inner pot 10 into the outer pot 4 again,
is inserted diagonally forward and placed on the race portion 4a of the outer hook 4.

In this case, regardless of the rotational position of the outer hook 4, the inner hook 10 only needs to be placed on the race portion 4a of the outer hook 4, so that it can be easily attached.

Next, when the opening/closing members 15 and 16 are closed, the pin 18 is inserted into the recess 9a.
The opening/closing member 15,16 is set in a predetermined closed position.

Next, with reference to FIGS. 4 and 5, a method for adjusting the needle-hook clearance δ will be explained.

First, take out the inner hook 10 from the outer hook 4 as described above, as shown in FIG. By changing the position from the side surface 5a, the needle/hook gap δ can be changed.

The needle/hook clearance δ is normally set to about 0.05 mm, and its tolerance is about 0.125 mm, and it is required to be able to make fine adjustments. Since the barrel pins 8g are close together and the mass of the movable parts is small, fine adjustment is easier than in the conventional method shown in FIG.

Once the adjustment is complete, place the inner pot 10 into the outer pot 4 as described above.
Sewing can be performed by closing the opening/closing members 15 and 16.

Next, the effects of the present invention will be explained.

First, in the present invention, since the inner hook of the horizontal hook can be attached and detached very easily, the customer can easily clean the hook in the event that threads are eaten away in the hook.

Next, in the present invention, since the regulating member and the opening/closing member only hold down the outer periphery of the outer hook and inner hook, the offshore center is not covered. Therefore, if the throat plate or sliding plate is made transparent, the bobbin can be The condition can be visually checked, and in particular, the bobbin thread remaining amount can be easily known.

Furthermore, with this invention, the inner hook can be installed by simply placing it on the race surface of the outer hook at any phase, making it much easier to handle than conventional products, which allow the inner hook to be attached and removed only at a specific phase. It's easy.

Furthermore, since the open position of the opening/closing member is maintained constant, it is possible to automatically close the opening/closing member by closing the sliding plate.

In addition, the outer hook is divided into two parts, and the thread ring catcher is movable relative to the outer hook body, so the gap between the hook tip and the needle (needle/hoot gap) can be adjusted as desired. There is an effect that can be done.

Moreover, to adjust it, take out the inner pot, loosen one screw,
It is only necessary to move the thread ring catcher slightly, and since the center of rotation of the thread ring catcher is close to the tip of the hook, and the mass of the movable parts is small, fine adjustments are easy. It has the effect of being quick and accurate.

Furthermore, the structure of the present invention is extremely simple and small-scale compared to conventional products, and the outer pot body can be made of aluminum plywood or synthetic resin, making it possible to reduce the weight and cost of the horizontal pot. effective.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of the horizontal hook of the sewing machine according to the present invention, Fig. 2 is a perspective view showing the opening/closing member in the open state, and Fig. 3 is the regulating member (
Fig. 4 is a longitudinal sectional view showing the positional relationship between the needle and the hook tip (opening/closing member) and the upper surface of the inner hook and outer hook; Fig. 5 is a longitudinal sectional view showing the positional relationship between the needle and the tip of the hook; and Fig. 5 shows the thread loop catching section being divided. Slope view of the outer pot,
FIG. 6 is an exploded perspective view of the outer hook shown in FIG. 5, and FIG. 7 is a partially cutaway perspective view showing the structure for adjusting the gap between the needle and the hook in a conventional product. In the figure, 4 is an outer hook, 4d is the main body of the outer hook, 8 is a thread ring catcher,
10 is an inner pot, and 20 is a screw which is an example of a fastening element.

Claims (1)

[Scope of utility model registration request] The thread ring catching member formed on the outer hook rotates horizontally around a substantially vertical axis, and the inner hook, which accommodates the bobbin inside the outer hook, is prevented from rotating and is mounted with its position regulated. In the horizontal hook of a sewing machine, the mounting position of the thread loop catching member provided on the outer hook is movable with respect to the rotation center of the outer hook body, and the hook tip formed on the thread loop catching member and the needle A needle hook clearance adjustment device for a horizontal hook of a sewing machine, characterized in that the needle and hook clearance between the side surface and the needle can be adjusted.