JPS6334755B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a needle threading device for a sewing machine that is removably mounted on the head of the sewing machine.

As a needle threading device of this type, the one shown in FIG. 1 has been known. According to this device, to thread the needle, first remove the face cover, then lift the arm 1 against the spring attached to the screw 3 until it leaves the seat 2, and turn it downward from the position shown by the dashed line in the diagram to the solid line position. After the slot 4 is aligned and fitted with the screw 6 on the needle bar 5, the arm 1 is moved forward in the direction of the arrow in this state. Since this device is constructed as described above, when threading the needle, the lid must be removed.

2. The operation consists of lifting the arm and pulling the slot away from the seat, rotating the arm, aligning and fitting the slot with the screw 6, and moving the arm forward, An extremely wide variety of things.

3. During the rotation operation, the arm is unstable and easily moves in the vertical direction and in the axial direction of the screw 3 within the range of the mounting slot 7.

There were other difficulties.

The present invention aims to eliminate the drawbacks of the conventional devices described above, and provides a needle threading device that can be easily and reliably operated.

Examples thereof will be described below based on the drawings.

The plate 12 inside the face cover 11 has its vertical groove 13.
A sliding member 14 is slidably fitted into the member, and a plate spring-like stop plate 15 attached to the member comes into elastic contact with the circumferential edge of the vertical groove on the back side of the plate, thereby stopping the member 14 at an appropriate position. ing. Reference numeral 16 denotes an arm supported by the sliding member 14 by a stepped screw 18 fixed through a vertical hole 17, and the upper fork 19 fits into the square piece 20 of the sliding member during normal tilting. (see Figures 2 and 3), and is movable in the vertical direction with respect to the sliding member. On arm 16,
Further, a knob 21 is preferably provided at the lower end so as to protrude outside the sewing machine frame when stored, as shown in the figure, and a holding piece 23 and thread hook 24 for guiding and holding the needle 22 are provided on the knob. At the same time, a convex part 26 is formed with a horizontal hole 25 in the middle part,
With the protrusion engaged with the plate, the arm 16 is tilted as shown in the figure, and when the arm 16 is lowered and the protrusion 26 reaches below the plate, it becomes pivotable, and the horizontal hole 25 is connected to the needle bar 28. It is adapted to be fitted and locked onto the upper pin 29. After fitting the pin, the bifurcated one can be pivoted in the direction of the arrow in Figure 6.
9 is arranged so that it can be spaced apart from the piece 20. For this reason, as shown in the figure, it is preferable that the lower part of the piece be cut out in a tapered shape and then bent in an inclined shape along the lower part. 30 is a spring that brings the arm into elastic contact with the sliding member.

FIG. 7 shows a case in which a claw 32 is bent on the arm 16 and drilled along the vertical groove 13 of the plate 12 instead of fitting the fork into the piece of the sliding member to prevent the arm from rotating. It is designed to fit into the slit 33. In order to allow the arm 16 to pivot after being positioned in the vertical direction, the lower end of the slit is connected with a transverse groove 34 in which the pawl 32 can pivot.

In each of the embodiments described above, the arm 16 is provided with a vertical hole 17 and is slidably supported on the sliding member 14, but if it is tiltable, it may be supported so that it can only rotate.

Also, in the embodiment shown in Figs. 2 to 6, instead of providing a square hook that fits into the fork on the arm and the sliding member, a convex portion on one side and a recess on the other side are provided so that the two can fit together. Alternatively, the pin may be released by tilting the arm and fitting the pin into the horizontal hole and separating the two from each other.

When threading with the device configured as described above, first, the device in the state shown in FIG. Align and fit the horizontal hole 25 formed at 26 with the pin 29 on the needle bar (Figs. 4 and 6). This performs vertical positioning. Next, with the pin 29 fitted in the horizontal hole 25, push the knob forward in the direction of the arrow to release the thread hook 24.
is inserted into the needle hole 34 to capture the thread (in this case, by pushing the knob until the end surface of the horizontal hole touches the pin, the needle thread can be captured reliably by the thread hook). After threading, perform the reverse operation to store the thread in its original position.

As described above, the threading device of the present invention is different from the conventional device described above because threading is performed by pushing down the knob, aligning and fitting the horizontal hole with the pin, and pushing the knob forward. Compared to this, it has the advantages of being easy to operate, and because the arm cannot rotate while the knob is being pressed down, the operation can be performed reliably without any movement.

Further, if the knob is provided outside the machine frame, there is no need to remove the face cover each time when threading the machine, so threading can be performed more simply and quickly.

Furthermore, if the arm and the sliding member are provided with a concave part and a convex part so that the two can be engaged and disengaged depending on the degree of inclination of the arm, the engaged state of the concave and convex parts can be released by tilting the arm at a desired position. Since the arm can be rotated by rotating the needle, no matter where the needle bar is locked, the arm can be positioned accordingly and the thread can be threaded.

[Brief explanation of the drawing]

Fig. 1 is a side view of a conventional device, Figs. 2 to 7 show a threading device according to the present invention, Fig. 2 is a front view of the main parts of a sewing machine in which this device is housed, and Fig. 3 is an operation 4 is a front view showing the state in operation, FIG. 5 is an exploded perspective view of essential parts, FIG. 6 is an overall perspective view, and FIG. 7 is an exploded perspective view of essential parts in a modified form. This shows that. 11... Face cover, 12... Plate, 13... Vertical groove, 1
4...Sliding member, 15...Stop plate, 16...Arm, 18...
Step screw, 19...bifurcated, 20...square piece, 21...knob, 25...horizontal hole, 29...pin, 32...claw, 33...
Slits.

Claims (1)

[Claims] 1. Plate 12 provided in the head of the sewing machine.
, a sliding member 14 supported by the plate so as to be slidable in the vertical direction; and a sliding member 14 rotatably and tiltably supported on the member by a shaft 18, and as the member slides in the vertical direction, the sliding member 14 is slidably supported in the vertical direction. The arm 16 that goes in and out and the shaft 1
The needle bar 28 is attached to the arm 16 and includes a spring 30 that is attached to the arm 16 and brings the arm 16 into elastic contact with the sliding member 14.
A horizontal hole 25 into which the upper pin 29 fits, a knob 21 for operating the arm, a thread hook 24, and a sliding member 1
The rotational movement relative to 4 is restricted during the push-down operation of the arm, tilting the arm, and is performed after the pin 29 is fitted into the horizontal hole 25. A sewing machine needle threader that is stored in the 2. The rotation restraining means consists of a pawl 32 provided on the arm and a slit 33 formed on the plate 12, and the slit has a pin that allows the pawl to pivot when the arm rotates after a pin is fitted into the horizontal hole. A needle threading device for a sewing machine according to claim 1, wherein a lateral groove 34 is formed. 3 Plate 12 provided in the head of the sewing machine
, a sliding member 14 supported by the plate so as to be slidable in the vertical direction and provided with a concave or convex portion; It consists of an arm 16 that moves in and out from below the head as it slides, and a spring 30 that is attached to the shaft 18 and brings the arm 16 into elastic contact with the sliding member 14.
The arm 16 further includes a horizontal hole 25 into which a pin 29 on the needle bar 28 is fitted, and a knob 21 for operating the arm.
A convex portion or a concave portion is provided that removably fits into the concave portion or convex portion of the thread hook 24 and the sliding member, and the concave portion provided on either the sliding member 14 or the arm 16 is connected to the convex portion of the other. On the other hand, during the push-down operation of the arm, the arm is in the fitted state and the rotational movement of the arm relative to the sliding member is restricted, and after the arm is tilted and the pin 29 is fitted into the horizontal hole 25, it is detached and the above-mentioned A needle threader for a sewing machine that releases restrictions on rotational movement of the arm and is stored in the head when not in use. 4. A needle threading device for a sewing machine according to claim 1 or 3, wherein the knob 21 is provided so as to protrude below the head even when the device is stored.