JPH0739777U - sewing machine - Google Patents

Abstract

(57) [Summary] [Purpose] To enable the rotation speed of the sewing machine at the start of sewing to be switched to a low speed without releasing the hand holding the sewing product. [Structure] A sewing machine head 2 driven by a motor 4,
A control box 3 for controlling the rotation of the sewing machine motor 4, a starting pedal 1, and a soft start switch 7 arranged near the starting pedal 1 for making the rotation of the sewing machine motor 4 at the start of sewing lower than the maximum speed. It has become.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an industrial sewing machine capable of switching the rotation of the sewing machine motor at the start of sewing to a speed lower than the maximum speed, and more particularly to a cycle sewing machine which automatically performs buttonhole sewing and bar tacking sewing of clothes. .

[0002]

[Prior art]

 In a conventional buttonhole sewing machine, when a starter pedal 1 shown in FIG. 1 is depressed, a switch (not shown) on the sewing machine head 2 is activated to send a signal to the control box 3. Then, the sewing machine motor 4 is rotated by a signal output from the control box 3 and the sewing machine head 2 starts predetermined sewing. Before the completion, a signal is sent to the control box 3 from the switch on the sewing machine head 2 again. Then, the sewing machine motor 4 is stopped at a predetermined position and sewing is completed. The control box 3 is provided with a knob 5 for setting the maximum rotation speed of the sewing machine, and a soft start switch 6 for keeping the rotation speed of the sewing machine at a slower speed than the maximum rotation speed for a fixed time at the start of sewing. There is.

By the way, normally, the sewing machine is preliminarily programmed so as to be sewn in the rotation mode shown in FIG. That is, first, the rotation of the sewing machine rises all at once until it reaches the maximum speed (a), maintains the maximum rotation speed (b), and becomes lower than the maximum rotation speed for a certain period of time before the end of sewing (c). ), Stop at a predetermined position (d). If the maximum rotation speed setting knob 5 is changed, the maximum rotation speed n ₀ of the sewing machine in (b) can be lowered (n ₁ ) or increased (n ₂ ). However, depending on the condition of the material to be sewn and the thread to be used, if sewing is performed in the rotation mode shown in FIG. 2, the rising of the rotation in (a) at the start of sewing may be too rapid and the thread may be pulled out from the needle. In this case, the soft start switch 6 is turned on, but after the soft start switch 6 is turned on, as shown in FIG. The rotation mode changes to the maximum rotation speed. By performing sewing in such a rotation mode, unnecessary resistance is not applied to the thread at the start of sewing, and thread loss can be prevented.

[0004]

[Problems to be solved by the device]

 In the above buttonhole sewing machine, the sewing manufacturer must manually operate the soft start switch 6 to make the rotation of the sewing machine at the start of sewing lower than the maximum speed. The start switch 6 is mounted in the control box 3. Therefore, if there are several sewn parts in one sewn product, and there are several parts that require a low rotation speed of the sewing machine at the start of sewing, such as changes in cloth thickness and steps, When sewing that part, once release one hand holding the sewn product, operate the soft start switch 6 with that hand, sew with the sewn product, and return the soft start switch 6 to the original position. A series of operations is required, which is very cumbersome and troublesome. Nevertheless, if the soft start switch 6 is left on, a series of sewing operations will be performed at low speed, which will increase the sewing time and reduce the work efficiency.

An object of the present invention is to enable the rotation speed of the sewing machine at the start of sewing to be switched to a low speed without releasing the hand holding the sewing product.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the sewing machine of this invention has a sewing machine head driven by a motor, a control box for controlling the rotation of the sewing machine motor, a starting pedal, and a maximum speed of rotation of the sewing machine motor at the start of sewing. It consists of a soft start switch located near the starter pedal for lower speeds.

[0007]

[Action]

 With the sewing machine configured as described above, when there is a change in the thickness of the cloth or there is a step, etc., when the soft start switch is stepped on with the hand holding the sewing product left The sewing machine motor starts rotating at a speed lower than the maximum speed.

[0008]

【Example】

 The sewing machine of the present invention will be described with reference to FIGS. 3 to 5.

The sewing machine of the present invention has the same basic configuration as the sewing machine shown in the conventional example. As shown in FIG. 4, the sewing machine head 1 driven by the sewing machine motor 4 and the rotation of the sewing machine motor 1 are controlled. It consists of a control box 3, a starter pedal 1, and a soft start switch 7 for making the rotation of the sewing machine motor 1 at the start of sewing lower than the maximum speed. In particular, the place where the soft start switch 7 is installed. It is the one near the pedal 1.

When the soft start switch 7 is separated from the control box 3 and installed in the vicinity of the start pedal 1, the soft start switch 7 is turned on by stepping on the foot with the hand holding the sewn product left, You can turn it off by releasing your foot. The function of the soft start switch 7 is the same as that of the conventional soft start switch.

The rotation mode of the sewing machine motor shown in FIGS. 2 and 3 is pre-programmed when the start pedal 1 is depressed or when the soft start switch is turned on and then the start pedal 1 is depressed. As shown in Fig. 5, the soft start switch 7 is turned on from the time of startup and turned on until the foot is released and turned off (a "). You may

[0012]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects.

That is, at the start of sewing, the soft start switch can be operated by the foot while holding the sewn product with both hands, so that the hand is sewn every time the soft start switch is operated as in the conventional case. There is no need to move it between the soft start switch and the soft start switch, and you can concentrate on the sewing work, which greatly improves the work efficiency.

[Brief description of drawings]

FIG. 1 is a perspective view of a conventional buttonhole sewing machine.

FIG. 2 is a graph showing a rotation mode of a sewing machine motor during normal sewing.

FIG. 3 is a graph showing a rotation mode of the sewing machine motor at the time of sewing when there is a change in cloth thickness, a step, or the like.

FIG. 4 is a perspective view of a sewing machine according to the present invention. It is a figure.

FIG. 5 is a graph showing another rotation mode of the sewing machine motor at the time of sewing when there is a change in the thickness of the cloth, a step or the like.

[Explanation of symbols]

 1 Start pedal 2 Sewing machine head 3 Control box 4 Sewing machine motor 7 Soft start switch

Claims (1)

[Scope of utility model registration request] 1. A sewing machine head driven by a motor,
A sewing machine that includes a control box that controls the rotation of the sewing machine motor, a starting pedal, and a soft start switch that is arranged near the starting pedal to keep the rotation of the sewing machine motor at the start of sewing lower than the maximum speed.