JP2585388Y2 - Half-turn kettle of sewing machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semi-rotating hook of a sewing machine in which a stitch is formed by catching an upper thread loop by a middle hook which swings and rotates in synchronization with the rotation of an upper shaft of the sewing machine. In particular, the present invention relates to improvement of workability in a work of attaching to a sewing machine and the like.

[0002]

2. Description of the Related Art FIGS. 4 and 5 are views showing the structure of a drive system mechanism of a half-turn shuttle sewing machine generally used at present.
In the figure, reference numeral 1 denotes a sewing machine upper shaft rotatably supported in a sewing machine arm (not shown). The upper shaft 1 of the sewing machine is rotated in a fixed direction by a sewing machine motor (not shown) connected to a pulley 2 provided at one end of the sewing machine via a belt or the like. The movement is converted into a vertical movement of the needle bar 4 and the sewing needle 5.

On the other hand, reference numeral 9 denotes a shuttle shaft rotatably supported in a sewing machine bed. The shuttle shaft 9 is linked to the sewing machine upper shaft 1 by a swinging mechanism including a crank shaft 6, a crank rod 7, a connecting member 8, and the like.
The swing rotation movement is performed once for the rotation. A semi-rotary shuttle 10 is attached to the end of the shuttle shaft 9.

[0004] The semi-rotating shuttle 10 is rotatably attached to a cauldron 11 fixed in a sewing machine frame (sewing bed) by an inner hook retainer 12 and a lower thread bobbin 15 to a bobbin case 16. And a driver 14 that rotates the inner hook 13 so as to be rotatable via the inner hook. At the center of the cauldron 11 is the hook shaft 9
Is rotatably fitted. The driver 14 is fastened to the tip of the hook shaft 9 protruding into the cauldron 11 with screws. As shown in FIG. 5, the driver 14 has a substantially semi-circular shape, and one end 14a of the driver 14 is connected to one end 13
a, the other end 14b contacts the other end 13b of the inner hook 13 and presses it in the same direction when rotating in the backward direction (direction b). To rotate to.

During the forward movement of the inner hook 13, the upper thread loop formed near the sewing needle is captured when the blade point 13 A slightly rises from the lower dead center, and is connected to the lower thread. Returns to the initial position by the return operation.

By the way, in order to perform the above-described stitch forming operation properly, it is necessary that the relative position between the sword tip 13A of the inner hook and the sewing needle 5 is properly set. It is necessary to accurately attach the driver 13 for operating the intermediate hook to the shuttle shaft 9. Therefore, the mounting operation of the driver 13 in the half-turn hook has conventionally been performed as follows.

First, the position of the sewing needle is set to a position where the upper thread loop is formed, that is, a position slightly elevated from the bottom dead center. As shown in FIG. 6, a needle bar metal 1 for supporting the needle bar 4 so as to be able to move up and down the engraved line 4a formed on the needle bar 4 in advance.
5 can be performed by matching the lower end 15a. Next, the driver 1 which is not fixed to the hook shaft 9
4 is manually rotated, and while the one end 14a is in contact with the one end 13a of the inner hook 13, the inner hook 1 is moved to the center of the sewing needle 5.
Then, the driver 14 is fixed to the shuttle shaft 9 in such a state.

When the driver 14 is fixed in this manner, when the sewing needle 5 is lowered to the upper thread loop forming position,
The sword point 13A of the inner hook 13 is moved by the driver 14 to the sewing needle 5A.
Is moved to the center of the upper thread, so that the blade point 13A can reliably catch the upper thread loop and knot the upper thread and the lower thread.

[0009]

However, in the above-mentioned conventional half-turn shuttle, when the position of the driver 14 is set, the position of the driver 14 is checked while confirming the positional relationship between the inner shuttle 13 and the sewing needle 5. Since the setting has been performed, there has been a problem that the work is difficult to perform and a lot of time is required.

That is, conventionally, since the positioning operation of the driver 14 is performed through the inner hook 13, the position of the inner hook 13 is shifted in the rotation direction, causing an error in the set position of the driver 14, or the operator's hand. There is a problem that the work of fixing the driver 14 is hindered by the rattling of the inner hook 13, and the setting work of the driver 14 requires a lot of time and labor.

However, a skilled worker may adopt a method of directly setting the position of the driver 14 while observing the relative position with respect to the sewing needle 5, but this method depends on the intuition and experience of the worker. This is a possible setting method, which is difficult for an amateur to do.

This invention has been made in view of the above-mentioned problems of the prior art, and an object of the invention is to provide a half-turn shuttle that allows any person to easily and quickly set the position of a driver.

[0013]

According to the present invention, a shuttle shaft that rotates and swings in synchronization with the rotation of an upper shaft of a sewing machine, and a shuttle shaft fixed to a sewing machine frame and rotatably inserted therethrough. A cauldron, a cauldron rotatably supported about the cauldron shaft by the cauldron, and alternately attached to the cauldron shaft at both ends of the cauldron as the cauldron shaft swings and rotates. A driver that swings and rotates the inner hook in contact with the driver,
When the driver and one end of the inner hook come into contact with each other, and the point of the needle for catching the needle thread formed on the inner hook matches the center of the sewing needle in the front direction, the driver and the sewing needle move in the front direction. An index indicating the crossing position is formed.

[0014]

In this invention, when setting the position of the driver, the index formed on the driver only has to match the sewing needle at the upper thread loop forming position, and the position can be set without attaching the inner hook. Becomes Therefore, even an unskilled worker can easily and accurately set the driver.

[0015]

1 to 3 show an embodiment of the present invention.
It will be described based on. The same or corresponding parts as those of the above-mentioned prior art are denoted by the same reference numerals, and detailed description thereof will be omitted.
The half-turn pot in this embodiment includes a cauldron 11, a middle pot 13,
A driver 14 and the like are provided, and this point is the same as that shown in the above-described prior art, except that a marking line I is formed as an index on the front of the driver 14.

The score line I is formed on the other end 14b of the driver 14 as follows. That is,
When the point of the sword of the intermediate hook 13 coincides with the center of the sewing needle 5 in the front direction by the forward rotation operation of the driver 14, that is, when it reaches the upper thread loop capturing position, a position that matches with the sewing needle 5 in the front direction. Is formed.

In this embodiment, the thickness of the score line I is set to 1 mm. When the point of the inner hook 13 is moved to the upper thread loop catching position as described above, ideally, The right side of the sewing needle 5 is located at the center of the marking line I. This is because there is an error of about ± 0.5 mm in the arc shape of the driver 14 which is generally mass-produced at present. In other words, even if the maximum dimensional error (0.5 mm) occurs in the driver 14, the set engraved line I cannot deviate from the right side of the sewing needle 5N in the position setting of the driver 14; Whether or not the setting operation is appropriate can be almost recognized based on whether or not the right side portion is located within the width.

Therefore, the driver 1 can be used for mounting the half-turn shuttle or adjusting the operation timing of the intermediate shuttle 13.
When the position setting of No. 4 is performed, after setting the sewing needle 5 to the upper thread loop forming position, the position of the driver 14 is set so that the right side of the sewing needle 5 is located substantially at the center of the width of the marking line I. Then, it may be fixed to the hook shaft 9. However, since the driver 14 may have a dimensional error within the range of about 1 mm as described above, in some cases, after the inner hook 13 is attached, the sword tip 13A is positioned at the center position of the sewing needle 5. It may be checked whether or not the driver exists, and if there is an error, the operation of shifting the position of the driver 14 right and left from the center of the marking line I may be performed according to the error. In this case as well, the width of the score line I protruding from the right side of the sewing needle 5N can be used as a guide, so that the workability is greatly improved as compared with the related art.

As described above, in this embodiment, since the position of the driver 14 can be set without mounting the inner shuttle 13, the fixing operation of the driver 14 is hindered by the inner shuttle 13 as in the prior art. The work can be performed efficiently.

In the above embodiment, the width of the score line I is 1 mm. However, the width is not particularly limited to 1 mm, and can be set to a larger value. For example, the engraved line I may be set to a width that allows it to protrude from the left and right sides of the sewing needle 5, and the setting operation may be performed using the amount of protrusion as a guide. When a driver 14 having a dimensional error of less than 1 mm is used, the width of the score line I may be set to 1 mm or less, and the present invention is not particularly limited to the above embodiment.

[0021]

As described above, in the semi-rotating hook of the sewing machine according to the present invention, the index indicating the position where the blade point of the inner hook intersects with the sewing needle when the blade point of the inner hook reaches the upper thread loop catching position is indicated by the driver. Therefore, it is possible to accurately set the position of the driver using the index as a guide without mounting the inner hook. Therefore, there is an effect that no skill is required for the worker, and the working time is greatly reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a front view showing a driver shown in FIG.

FIG. 3 is a partially enlarged front view showing a state of alignment between a score line and a sewing needle shown in FIG. 1;

FIG. 4 is a perspective view showing an internal configuration of a conventional half-turn shuttle sewing machine.

FIG. 5 is a front view showing the conventional half-turn shuttle shown in FIG.

6 is an enlarged front view showing a position setting state of the needle bar shown in FIG. 4;

[Explanation of symbols]

 1 Upper shaft of sewing machine 9 Hook shaft 11 Large hook 13 Middle hook 14 Driver 15 Lower bobbin I Marking line (index)

Claims (1)

(57) [Scope of request for utility model registration] 1. A shuttle shaft that performs a rotational swing motion in synchronization with the rotation of an upper shaft of a sewing machine, a cauldron fixed to a sewing machine frame, and through which the shuttle shaft is rotatably inserted. An inner hook that is rotatably supported around the hook shaft, has a sword point that captures a loop of the upper thread inserted through the sewing needle, and rotatably supports the lower thread bobbin, and is detachably attached to the hook shaft. And a driver that alternately abuts both ends of the inner hook with the swinging rotation of the hook shaft to swing and rotate the inner hook, and the driver and one end of the inner hook come into contact with each other, and An index indicating the position where the driver and the sewing needle intersect in the front direction is formed on the driver when the point of the needle for catching the needle thread formed on the inner hook coincides with the center of the sewing needle in the front direction. A half-turn pot of a sewing machine characterized by the following.