JPH0130513B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an attachment suitable for use in a sewing machine, particularly a free arm type sewing machine, which is detachably connected to a throat plate so as to be substantially flush with the throat plate. Regarding.

When sewing buttonholes or embroidery using a buttonhole sewing device or a embroidery device, conventionally the square plate that is pivoted to the throat plate is removed and a pinion is placed above to drive the device. A square plate with an intermittent feed mechanism that engaged with the operating mechanism of the sewing machine and rotated the pinion intermittently was attached to the lower side of the square plate. It is relatively troublesome to attach and detach the throat plate while the operation is being performed, and the movement of the operating mechanism lifts up the throat plate along with the intermittent feed mechanism to try to open and close the device. The stitching performed by the machine becomes unstable. If the force of the spring is increased in order to prevent opening/closing due to the throat plate sticking up, this will impede the smooth movement of the device and cause problems such as increased wear on parts.

When connecting a square plate like the one described above to the needle plate of a free arm type sewing machine so as to protrude from the bed, it is necessary to take further care to ensure that the square plate is horizontal. It is also possible to connect the square plate to the throat plate by inserting it, but simply inserting it may cause it to fall off due to carelessness, and since the square plate is supported in a cantilevered manner, do not place your hand on the corner plate. If you are working with the pinion, it will tilt depending on the presser foot, and as a result, the pinion will not be able to drive the buttonhole sewing device, embroidery sewing device, etc. that are placed on it, and there is a risk that it will fall off.

SUMMARY OF THE INVENTION An object of the present invention is to provide an attachment that is locked by insertion, can be easily and reliably attached to the throat plate, and can be unlocked with a single touch when attached.

Embodiments of the present invention will be described below with reference to the drawings. The illustrated attachment 1 is removably attached to a free arm type sewing machine bed 2, and is interlocked with an operating mechanism (not shown) in the bed 2 for intermittent feed. Mechanism 3 (an example of this mechanism is shown in Japanese Patent Application No. 56-144273, which was previously proposed by the present applicant) intermittently rotates a pinion 5 protruding from the top of the case 4, thereby causing the needle plate 6 and the top of the case to rotate. This type is designed to drive a buttonhole sewing device, a embroidery sewing device, etc. placed in Support pieces 9, 9 formed at both ends are supported by a base plate 10 protruding from the case 4, and a support piece 11 bent from the base plate, with hooks 12, 12 at one side and both ends, and a projecting piece at the middle part. 13 and a knob 14 integrally formed on the other side, and a spring that is hung between the protrusion piece 13 and the intermittent feed mechanism 3 and always biases the bracket 15 in the direction of the arrow in FIG. A locking device 16 is provided, and the needle plate, preferably the bed 2, is provided below the throat plate 6 with an insert 18 for the support piece 9 or a locking portion 19 on which a hook is engaged.

To attach attachment 1 to bed 2,
This is done by inserting the support piece 9 into the insert 18 and pushing the attachment as it is.

As a result, the hook 12 holds the locking portion 19 against the spring 16.
It latches while pivoting against the action of (see Figure 4). The attachment is then locked to the bed. The attachment is removed by pushing up the knob 14 against the action of the spring 16, removing the hook 12 from the locking portion 19 to release the lock, and then pulling out the attachment 1.

In the above configuration, the hook faces upward and is engaged with a downward engaging part, or conversely, the hook may be directed downward and engaged with an upward engaging part. In any case, the attachment 1 is attached to the bed 2 in the above manner in a cantilevered manner, and depending on the degree of pressure applied to the attachment, it may tilt, and the pinion 3 or the buttonhole sewing device or the stitching device placed above the attachment. It separates from the sewing device and becomes unable to drive the device.

To deal with this problem, a lid cover 20 is provided on one side of the bed with its lower end pivoted to the bed machine frame.By opening and closing the lid cover 20, the bobbin can be taken in and out, and its upper end supports the bottom of the attachment. It is set as.

That is, after opening the lid cover 20 and attaching the attachment 1 as described above, the lid cover is pushed in the direction of the arrow in FIG. 3, and its upper end is pressed against the bottom surface of the attachment. In order to prevent the lid cover 20 supporting the attachment from opening and coming off the attachment during work, it is desirable to provide a convex portion 21 on the bottom surface of the case 4, and to lock the upper end of the lid cover to the convex portion. The upper end of the lid cover can be locked to the convex portion by pushing the lid cover while lifting the attachment.

When the lid cover is provided on one side of the bed as described above, the upper edge of the machine frame that forms the opening into which the lid cover fits can be used as the locking part 19, and a new locking part is formed. Not necessary and desirable.

Although the present invention is applied to an attachment attached to a free-arm type sewing machine bed, it is also possible to apply the present invention to a conventional square plate equipped with an intermittent feed mechanism. In this case, since the square plate attachment is supported on the bed, there is no need for a support to support the attachment from below, and the support piece can also be omitted.

As described above, the attachment of the present invention is locked by inserting the hook under the throat plate and pushing it in. Therefore, the attachment can be installed easily and reliably, and the lock can be released with one touch, making it easy to remove. It is.

Furthermore, when the attachment of the present invention is attached to a free arm type sewing machine bed, a lid cover that allows bobbins etc. to be taken in and taken out is attached to one side of the bed so that it can be opened and closed. The attachment, which is supported like a beam, is supported and does not tilt depending on how much pressure is applied to the attachment, making the attachment even more stable.

[Brief explanation of drawings]

Figure 1 is a perspective view of a free arm type sewing machine with the attachment attached, Figure 2 is a bottom view of the attachment, Figure 3 is a perspective view of the locking device, and Figure 4 is a vertical sectional view of the attachment in the attached state. It is. 1...Attachment, 2...Bed, 3...
Intermittent feed mechanism, 4...case, 5...pinion,
6... Throat plate, 9... Support piece, 10... Base plate, 12
...Hook, 14...Knob, 15...Bracket, 16...Spring, 18...Insert, 19...
Locking part, 20...lid cover.

Claims (1)

[Scope of Claims] 1. An attachment that is removably connected to the throat plate attached to the sewing machine bed, is pivotably supported by the attachment, and is normally rotated in one direction by the action of a spring 16. It has a locking device including a biased hook 12 and a knob 14 integrated with the hook, and when the attachment 1 is pushed toward the throat plate 6, the hook 12 locks into the locking portion 1 provided on the bed side.
9 is pivoted against the action of a spring 16, the attachment is locked in the connected state, and the lock is released by pushing the knob 14. 2. The locking device further includes a support piece 9 inserted into the insert 18 under the throat plate.
Attachments listed in section. 3. A lid cover 20 is provided on one side of the bed 2, the lower end of which is pivotally supported on the bed machine frame, and which allows bobbins etc. to be taken in and out by opening and closing the lid cover 20. The attachment according to claim 1, wherein the supported attachment (1) is further supported at the upper end of the lid cover in an open state. 4. The attachment according to claim 3, wherein the attachment is provided with a convex portion 21 on the lower side of which the upper end of the lid cover is engaged.