JPH0117265Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an attachment that automatically stops the sewing machine when the sewing of the pattern is completed using a special pattern sewing attachment, which prevents double stitching of the pattern or insufficient stitching, thereby producing a beautiful sewn product. Additionally, it can be easily installed on existing sewing machines.

Currently, special pattern sewing attachments such as flower stitch attachments and oval stitch attachments that are commercially available do not have any control mechanism such as automatically stopping the sewing machine when the pattern is completed. Not yet. For this reason, when using a conventional sewing machine, it requires considerable experience to confirm when the pattern is completed, and as a result, there are parts where the pattern is sewn twice, making it difficult to sew. It is nothing. In order to avoid such sewing failures, it is necessary for the operator to carefully control the sewing machine using the controller, but this is very difficult to do in reality, and the sewing work is difficult. It has the disadvantage of being extremely inefficient.

The present invention was developed in consideration of the above-mentioned circumstances, and as a result, the sewing machine automatically stops when the pattern is completed, ensuring flawless sewing at all times, and can be easily attached to electric sewing machines currently on the market. The present invention aims to provide an automatic stop attachment as described above.

An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, an example is shown in which the attachment A is implemented in a circular stitching device, and FIG. 3 is a switch placed at an appropriate position for detecting the number of stitches; 4 is a lever that is engaged with the sewing machine needle bar; the lever 4 is linked to the rotation of the sewing machine; This is to operate the switch 3 mentioned above.

Figure 3 shows the electrical connection A' between the attachment A of the present invention, the sewing machine body B, and the controller plug C.
B' and C' are shown, and 5 is an operation button for a reset device provided on attachment A.

Fig. 4 is a block diagram of its internal circuit, where 6 is a counter that can preset the number of stitches until the pattern is completed, 7 is a flip-flop circuit with a signal holding function, 8 is a reed relay coil, and 9 is a thyristor. . 10 is a reset device.

Next, the operational relationship of the present invention will be explained with reference to FIG. 4. When the controller is operated, the sewing machine is driven, and the switch 3 is actuated by the lever 4, which moves up and down accordingly. This operation is sent to the counter 6 as the number of stitches, and when the switch 3 is opened and closed by the number of stitches until the pattern is completed, which is preset in the counter 6, the reed relay coil 8 is energized via the flip-flop circuit 7. be done. Due to this energization, the normally closed contacts a and b are opened, the thyristor 9 is turned off, and the sewing machine motor M is stopped despite the operation of the controller.

When you want to sew the pattern again, press the button 5 of the reset device 10, and the contacts a,
b is made conductive and the sewing machine motor M is driven by stepping on the controller, and when the predetermined number of stitches is reached again, the sewing machine automatically stops as described above.

In the present invention, it is also easy to configure the circuit so that the sewing machine driving speed is automatically limited as appropriate when the attachment is used.

According to the present invention as described above, when a flower stitch attachment or the like is used and a predetermined pattern is completed, the sewing machine is automatically stopped;
Therefore, sewing errors are prevented, and it also contributes to work efficiency. Moreover, it is easy to carry out as it is sufficient to attach a compact attachment, so it is a highly effective idea from an industrial practical point of view. .

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the relationship between the attachment of the present invention and a circular stitching device, which is an embodiment of the attachment, Fig. 2 is an exploded perspective view of the circular stitching device, and Fig. 3 is a perspective view showing the relationship between the attachment of the present invention, the sewing machine body, and the controller plug. A perspective view showing the relationship, and FIG. 4 is a circuit block diagram thereof. In the figure, A is an attachment, 3 is a switch that is a signal source, 6 is a counter, and reed relay coil 8
Contacts a and b are switching elements, and M is a sewing machine motor.

Claims (1)

[Scope of utility model registration request] Sewing machine body B equipped with a motor that drives the sewing machine
A switch for a sewing machine which is removably attached to a sewing machine and is provided with a removable part for a sewing machine operating speed controller, and which emits a signal to the attachment for each rotation of the sewing machine to count the number of stitches; A pattern-completed automatic stop attachment comprising a counter capable of setting a scheduled number of stitches, and a switching circuit that stops a sewing machine drive motor when the above-mentioned count and the set count match.