JPS6036499B2 - Embroidery frame detection device for embroidery sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an embroidery stitch in which a stitch is formed by moving an embroidery frame using a driving means such as a stepping mode, based on movement amount data of the embroidery frame stored in a storage means such as a floppy disk. Regarding the embroidery frame detection device for embroidery sewing machines that detects the approach of the embroidery frame to the vertically moving needle and generates a signal, it is particularly capable of easily and always detecting the embroidery frame reliably regardless of the size or installation position of the embroidery frame. The purpose is to

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a table having a flat upper surface la, and the sewing machine 2 is mounted so that the head surface 2a is located on the same plane as the upper surface la.

The sewing machine 2 has a drive motor M connected to a main shaft (not shown).
The needle 3 is moved up and down in conjunction with. 4 is the top surface of table 1
a, which removably supports a circular embroidery frame 5 holding cloth stretched therein, and a pair of stepping motors (not shown) arranged below the table 1.
It is possible to move in the combined direction with the Y direction along the axial direction of the main shaft of the sewing machine and the X direction along the direction orthogonal to the Y direction.

FS is a detection means for the embroidery frame 5, and the embroidery frame 5 is placed at the lower end of a support 6 fixed to the lower end of the machine frame of the sewing machine 2, facing the vertical movement path of the needle 3 so that the needle 3 can pass through it. Fix the conductive ring 7 placed on the same horizontal plane as the ring 7.
is electrically connected to a control circuit to be described later via the support 6.

A conductive ring 8 connected to a conductive wire 101 corresponding to the outer circumference of the ring 7 is supported on the ring 7 by a connecting body 9 made of a movable insulator (for example, rubber). Usually, they are separated and electrically insulated, but when the ring 8 contacts the embroidery frame 5 and is pressed, the ring 8 contacts the ring 7 against the elastic force of the connecting body 9 and becomes electrically conductive. Generates a detection signal. Although not shown, the control circuit of this sewing machine is set to automatically stop the sewing machine when the rings 7 and 8 come into contact with each other during sewing and a detection signal is generated. This invention has the above-mentioned configuration, and while the sewing machine is driving and forming embroidery stitches on the cloth held by the embroidery frame 5 based on data stored in the storage means (not shown), the embroidery When the frame 5 approaches the vertical movement point (needle drop point) of the needle 3, the outer ring 8
is brought into contact with the inner end surface of the embroidery frame 5, and the connecting body 9 is manipulated so that the ring 8 comes into contact with the inner ring 7, thereby causing continuity between the two and generating a detection signal.

Upon generation of this detection signal, the sewing machine is immediately stopped, and the needle 3 and the embroidery frame 5 do not engage with each other. Next, other embodiments will be described.

In FIG. 5, a non-magnetic ring 11 is fixed to the lower end of the hand-held body 6, and is disposed on the same horizontal plane as the embroidery frame 5 and facing the vertical movement path of the needle 3. A plurality of magnetic sensing elements (Hall elements) 12 are embedded along the inner periphery of the embroidery frame 5, and each wheel element 12 is connected to the control circuit described above.

In the above configuration, as shown in FIG.
When the embroidery frame 5 approaches the embroidery frame 5, the Hall element 12 embedded in the ring 11 detects the magnetism of the magnet 13 of the embroidery frame 5 and generates a detection signal. Further, in this embodiment, the embroidery frame 5 is shown as having a perfect circular shape, but it may also be shaped like an ellipse. In addition, in this embodiment, a ring 7 is provided around the needle 3.
. The object to be detected may be fixed to an embroidery frame or a support frame. Furthermore, in this embodiment, the rings 7 and 8 are arranged on the same horizontal plane as the embroidery frame 5, but as shown in FIG. A plurality of detecting means 15, which can serve as bodies, are provided on the lower end surface along the intervening direction, and a plurality of rings 14 are disposed so as to be located above the embroidery frame 5 so that the needle 3 passes through and faces the vertical movement path of the embroidery frame 5. A detection signal may be generated when the reflected light from the end face is detected.

Further, in the above embodiment, the detection means is arranged above the needle slope, but as shown in FIG. A plurality of detection means 17 such as elements may be embedded in a cylinder to detect the lower end surface of the embroidery frame 5.

Further, in this embodiment, the sewing machine is stopped in relation to the generation of the detection signal, but instead of this, the lower end surface of the embroidery frame 5 may be detected.

Further, in this embodiment, the sewing machine is stopped in relation to the generation of the detection signal, but instead of this, the movement of the embroidery frame may be stopped, or both the sewing machine and the embroidery frame may be stopped. It may also be used to align the embroidery frame before sewing, check the size of the embroidery frame, etc. As described above, according to the present invention, the detection means 7, 8, 12, 13 are arranged in relation to each other between the sewing machine and the embroidery frame and detect the approach of the frame of the embroidery frame to the needle drop point and generate a detection signal. , 15, when the needle approaches the embroidery frame during sewing, the detection means generates a detection signal, so if the sewing machine or embroidery frame is set to stop when the detection signal is generated, the needle and embroidery frame can be This has the effect of preventing both from engaging and being damaged, as well as preventing the formation of seams outside the frame.In addition, the possible embroidery range within the frame is calculated from the detection signal before sewing, and the embroidery area is memorized in advance. If the data exceeds this range, set it so that the sewing machine cannot start or generates an alarm.You can obtain the same effect as above and also be able to correct the data before stitches are formed on the fabric. Furthermore, even if the size of the frame and the mounting position are different, the position where the needle approaches the frame can always be reliably detected.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the sewing machine device of this embodiment, Fig. 2 is a perspective view of the detection means of this embodiment, Fig. 3 is a plan view of the detection means of this embodiment, and Fig. 4 shows the detection state. 5 is a plan view of the detection means of this embodiment, FIG. 5 is a perspective view of the detection means of another embodiment, FIG. 6 is a plan view showing the state of use of the detection means of FIG. 5, and FIG.
The figure is a perspective view of the detection means of another embodiment, and FIG. 8 is a plan view showing the state of use of the detection means of another embodiment. Spear garden illustration 7 Spear 8 illustration Z drawing Garo illustration Spear box

Claims (1)

[Claims] 1 A base 1 on which a sewing machine with a needle that moves up and down in conjunction with the main shaft is placed on a horizontal top surface, and an embroidery frame 5 that can be held by stretching cloth within the frame and can be moved on the top surface of the base. , a driving means connected to the embroidery frame so as to be able to move and stop the embroidery frame under electrical control, and a drive means arranged in relation to the sewing machine and the embroidery frame to detect the approach of the frame of the embroidery frame to the needle drop point and generate a detection signal. An embroidery frame detection device for an embroidery sewing machine, comprising detection means 7, 8, 12, 13, and 15.