JPS607669Y2 - electric sewing machine controller - Google Patents

Description

[Detailed description of the invention] The present invention relates to a controller for an electric sewing machine, and in particular, a variable resistor for speed control of the sewing machine motor and other related electrical parts are built into the sewing machine head, and the variable resistor is adjusted outside the sewing machine frame. The present invention provides a controller for an electric sewing machine that operates according to the air pressure that is operated, and a part of the controller attached to the sewing machine head is not treated as an electrical component or subject to restrictions, and is inexpensive. It is easy to operate and can be operated by hand or other means, and if necessary, the so-called nick restart method can be easily performed, and it can also be used as a vacuum cleaner near the pot.
Moreover, it is equipped with a safety device against temperature rise.

An embodiment of the present invention will be described below with reference to the drawings. 1 is a sewing machine head, 2 is an AC power cord that is wound onto a built-in take-up reel (not shown) when the wind-up button 3 is pressed, and 4 is a material expansion spring (not shown)
41 is a flexible tube (air conduit) that communicates airtightly with the container 4; 43 (Fig. 2) is a minute breathing hole;
Reference numeral 44 denotes a closure piece which is properly attached to the surface of the container 4 so that the closure part 45 is always kept at a small distance above the hole 43; 5, which is fixed to the sewing machine frame; One-touch tube connector 6 (Fig. 3) is the one-touch tube connector that can be easily attached and detached from the connector 5.
This is a bellows which is airtightly communicated with the figure through pipes 58 and 59 and supported by the mounting frame 60, and the bellows 6 has an operating part (bottom part) 61 which is also fixed to the mounting frame 60 in the free state. The pressure sensitive resistor 7 is disposed in such a manner that it faces the attached pressure sensitive resistor 7 in a non-pressurized manner.

The pressure-sensitive resistor 7 is a rubber piece 73 made of pressurized conductive rubber (Japan Synthetic Rubber KK, JSR-POR, etc.) that has a pressure-sensitive function as shown in FIG. Two fine or lattice-like electrodes 71 and 72 are molded in a non-contact manner in a layered manner, or as shown in FIG. The pressurized conductive rubber 73' is fixed on the printed electrodes 71' and 72', which have fewer movable sliding parts, are durable and oil resistant, and have good resistance change characteristics. suitable.

8 is an inflow limiter to the bellows 6, 9 is a switch for use with a switching operation section provided outside the machine frame, and 10 is a jet nozzle 11.
This is a pumping device for blowing air out for cleaning dust (or for creating an airflow for transporting the upper thread in automatic threading, etc., although detailed explanation is omitted here).

Since the present invention is as described above, when the tube end 42 is connected to the connector 5 and the container 4 is pressed in an adjustable manner, the bellows 6 is expanded to the left in response to the pressure, and the pressure-sensitive resistor 7 is expanded. The resistance between the terminals of the sewing machine motor can be adjusted freely.
(not shown), the speed of the sewing machine can be freely controlled by adjusting the pressure on the container 4.

To briefly mention other matters, the container 4 can be shaped and sized conveniently for use with the foot, in the palm of the hand, or any other appropriate part of the body, depending on the purpose.
Various types may also be prepared.

43 is a small breathing hole (a spongy one may also be provided) provided at a suitable location to prevent the risk of an accident due to a natural increase in pressure when the environmental temperature rises when the container 4 is left connected. When the container is pressed, it is closed by pressing the container through the closing piece 44, but it is breathable when not in use.

Further, during short-time work, even if the sewing machine is handled carelessly and the closing piece 44 is not necessarily pressed, that is, a slight leakage is allowed, there is no practical problem in controlling the speed of the sewing machine.

Attaching and detaching the tube 41 is very easy; to attach it, simply push the end 42 into the receiving part 51, and to remove it, press the release button 56 and attach the wedge ring 55 that expands the O-ring 53 to the spring 54. Just pull out the tube end 42 while pushing it to the left (not shown).
(You may also have a built-in spring that pushes it to the right.)
.

The numeral 8 is essentially a unidirectional restrictor installed in the middle of the conduit to provide so-called nick restart performance.

If the switching device 9 is placed on the side of the pumping device 10, it is possible to intermittently supply strong air to the discharge pipe 11 by rapidly repeating the pressing and releasing of the container 4. Therefore, it is necessary to place the switching device 9 near the hook of a sewing machine, for example. It can also be used to clean dust by blowing air into appropriate nozzles.

As described above, the present invention has great industrial effects in that it is possible to incorporate the controller-related electrical parts and cutters into the sewing machine body, and it is also convenient to operate and can be used in a wide range of applications.

[Brief explanation of drawings]

Figure 1 is a perspective view showing how the controller of the present invention is used in a sewing machine, Figure 2 is a partial sectional view of the container, Figure 3 is a sectional view of the main parts inside the sewing machine head, and Figure 4 is a part of the connector. Figure 5-A is a cross-sectional view of the pressure-sensitive element;
-B figure is another example figure.

Claims (1)

[Scope of utility model registration request] A pressure-sensitive resistance element placed inside the sewing machine frame is placed so as to be compressed by a bellows which is disposed opposite to the element and can be expanded by pressurizing air, and the bellows is placed outside the sewing machine frame to control air pressure. In an electric sewing machine controller that is connected to a container for air pressure control and controls the speed of a sewing machine motor by adjusting the resistance of the pressure-sensitive resistance element by operating the container, an end of a flexible tube communicating with the air pressure control container is detachable. 1. A controller for an electric sewing machine, characterized in that a tube connector is disposed in a machine frame, and an application switching device that can be switched from the outside is disposed between the tube connector and the bellows.