JPH0616372B2 - Enamel wire applicator and enamel wire manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an applicator capable of uniformly and stably applying varnish to a filament by a felt method, and a high-quality applicator using the applicator. The present invention relates to an enamel wire manufacturing apparatus for manufacturing an enamel wire.

[Prior Art] To manufacture an enamel wire, a varnish is applied to the outer periphery of the filamentous body, and the varnish is passed through a baking furnace and baked, and the application and baking are repeated a required number of times to obtain an enamel film having a required thickness. To form.

For the application of varnish to the filaments, a vertical furnace is used to apply the varnish to the filaments, and the filaments are passed through the varnish bath to attach the varnish, which is then squeezed with a die to make it uniform. However, the above method is not always suitable for the size of fine or extra fine products, and a horizontal furnace adopting a felt system is often used.

That is, part of the varnish is immersed in the varnish and the filament is brought into contact with the rotating roll surface to allow the varnish on the roll surface to adhere to the filament and then provided in the traveling direction of the filament. The felt is sandwiched between the filaments to evenly adhere the varnish.

FIG. 4 shows a coating device of this type of conventional structure.

Reference numeral 15 denotes a roll that is partially immersed in the varnish 7 in the varnish tank 16 and rotates in the direction of the arrow in the figure. The roll 1 is usually formed with grooves 15a, 15a.
The filaments 10 and 10 for each pass are accommodated in 15a and are configured to move in the direction of the arrow while being in contact with the roll. Felts 12, 13 held by a felt holder 14 are provided in front of the linear bodies 10, 10 by the felt holders 14, 13.
While the 10 is held, the weight 11 applies an appropriate holding pressure.

Since it is configured as described above, the varnish 7 in the tank 16 adheres to the outer surface of the rotating roll 15, and
It is supplied toward 0 and 10. The filaments 10, 10 advancing in contact with the roll 15 adhere the varnish 7 supplied by the roll 15 to the surface, but since the amount of attachment can be uneven only by that, the felts 12, 13 make the filaments even over the entire filament. A varnish of various thickness is applied. After that, the filament 10 having the varnish attached thereto passes through the inside of the baking oven, the varnish is baked and returns to the roll 15 side again, and the varnish is applied again on the baked varnish. By repeating this, an enamel layer having a desired thickness is formed.

[Problems to be Solved by the Invention] In the case of the supply system shown in FIG. 4, the amount of varnish attached to the filament 10 in the roll 15 constantly fluctuates, and the amount of varnish supplied to the felts 12 and 13 is constant. Therefore, the thickness of the varnish film changes and the wire diameter is not stable.

Further, as described above, the V-shaped grooves 15a, 15a are usually formed in the roll 15 for each pass to facilitate the adhesion of the varnish to the linear body 10. Since the varnish coating is repeated for each pass, the outer diameter of the filamentous body 10 increases for each pass, and the amount of varnish attached to the surface in the groove 15a changes for each pass.

In recent years, the development of the electronics field has been remarkable, and the demand for higher performance and higher precision of the device itself has become more and more severe day by day. There is a strong demand for quality assurance for the ultrafine precision enameled wire used in such an apparatus, and it is becoming difficult for the varnish coating apparatus having the above-mentioned conventional structure to meet such a severe demand of the customer.

The present invention has been made in consideration of the above-mentioned circumstances, and it is possible to control the amount of varnish supplied to the felt to an optimum amount, and thereby to make the amount of varnish for each pass constant and uniform. It is an object of the present invention to provide a new applicator and an enameled wire manufacturing apparatus that enable varnish application, have a good wire diameter, a good appearance, and obtain an enameled wire with stable quality.

[Means for Solving the Problems] The present invention eliminates a varnish coating roll in a felt system, forms a varnish chamber in which the varnish can be directly supplied to the felt holding the linear body, and supplies the varnish to the felt. The varnish is configured to be uniformly controllable via a leveling plate provided in the varnish chamber, while the varnish is supplied to the varnish chamber by a precision metering pump to control the amount of varnish delivered.

As a result, the optimum amount of varnish is always supplied to the felt, and uniform stabilization of the varnish coating is achieved.

[Examples] The present invention will be described below based on Examples.

FIG. 1 is a schematic explanatory view showing a configuration of an enameled wire manufacturing apparatus according to the present invention.

In the present invention, when the varnish 7 is applied to the filament 10, the applicator 20 is used without using the application roll in the conventional example.

Regarding a specific configuration example of the applicator 20 according to the present invention, FIG. 2 shows a sectional view in the traveling direction of the filamentous body 10, and FIG. 3 shows a sectional view in the direction orthogonal thereto.

It is composed of two felts 22 and 23 for sandwiching the filament 10 and applying varnish, a weight 21 for giving a proper sandwiching pressure to the felts 22 and 23, and a holder 24 for holding the felts 22 and 23, The holder 24 has felt 22,
Supply hole 28 that can supply varnish to 23 well
The varnish chamber 27 having (the holes may be round holes, slit-shaped or a combination thereof, and the number may be one or a plurality of long holes) is formed.
A varnish supply port 29 is provided which can be connected to a piping tube 3 described later for supplying a controlled amount of varnish. Further, in the figure, reference numeral 25 is a leveling plate, which divides the second varnish chamber 26 which is in direct contact with the felt to thereby make the varnish pressure in the longitudinal direction uniform through the communication hole 25a. Is. It should be noted that the configuration of this leveling plate only needs to make the varnish pressure uniform, and the arrangement and shape thereof, the shape of the communication holes, and the like are not limited to those in the above embodiment.

A pipe tube 3 shown in FIG. 1 is connected to the varnish chamber 27 of the applicator 20, and the pipe tube 3 is connected to a precision metering pump 2 capable of accurately delivering a fixed amount of varnish like a gear pump. The pump 2 is further connected to the varnish tank 1 storing the varnish 7,
It can be driven by a drive motor 5 such as a stepping motor whose rotational speed can be adjusted with high precision. 6 is a coupling.

Here, the number of revolutions of the variable speed motor 5 is made to correspond one-to-one with the discharge amount of the metering pump 2 which supplies the amount of varnish comparable to the film thickness of the wire diameter, and the varnish supplied by setting the number of revolutions. It is constructed so that the quantity is constant.

In the apparatus according to the present invention configured as described above, the filamentous body 10 advances as shown by an arrow in the drawing, and the applicator 20
The varnish is applied, and the varnish is applied in a baking furnace (not shown). After the baking, the varnish is returned to the applicator 20, and the varnish is applied for each pass. By repeating this operation for a required number of passes, an enamel wire having an arbitrary film thickness is manufactured. In this way, the applicator 20 constantly adjusts the varnish amount applied to the filamentous body 10 with high accuracy and evenly so as to obtain the optimum varnish amount. It is possible to manufacture a high-quality enameled wire without unevenness in outer diameter over the entire length.

[Effects of the Invention] As described above, according to the device of the present invention, the following excellent effects can be obtained.

(1) A precision enameled wire with high accuracy can be manufactured.

(2) By controlling the film thickness of the filament wire diameter in the longitudinal direction for each pass, it is possible to suppress the wire diameter film within a certain range.

(3) The coating thickness is determined by the discharge rate of the precision metering pump regardless of the viscosity and temperature of the varnish, and the discharge rate can be changed by adjusting the variable speed motor. You can

(4) Since the enamel application state is stable, it is possible to manufacture a good quality enamel wire.

(5) Since the amount of varnish adhering to each pass can be reduced to, for example, a discharge amount of 2.5 μm or less per pass, it is possible to print an enameled wire with good appearance without flatness or uneven thickness. .

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing a specific example of the manufacturing apparatus according to the present invention, FIGS. 2 and 3 are cross-sectional views in orthogonal directions showing specific examples of the applicator according to the present invention, and FIG. It is an explanatory sketch which shows a coating device. 1: Varnish tank, 2: Gear pump, 3: Piping tube, 5: Variable speed drive motor, 10: Linear body, 20: Applicator, 22, 23: Felt, 24: Holder, 25: Leveling plate, 25a: Communication Hole, 26: second varnish chamber, 27: varnish chamber, 28: supply hole, 29: supply port.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kishiro Miura 1500 Kawajiri-cho, Hitachi-shi, Ibaraki Inside Toyoura Plant, Hitachi Cable Co., Ltd. (56) Reference JP-A-57-119413 (JP, A) JP-A-SHO 62-158972 (JP, A) JP-A-1-209608 (JP, A) Actually developed 62-172983 (JP, U)

Claims (2)

[Claims] 1. A varnish chamber having two felts sandwiching a linear body and applying varnish, a varnish chamber having a supply hole provided adjacent to the felt for supplying varnish to the felt, and a pipe for feeding the varnish to the varnish chamber. An applicator for an enamel wire, wherein the varnish chamber is provided with a leveling plate having a communication hole communicating with a second varnish chamber for equalizing the varnish pressure in the longitudinal direction of the felt. 2. A precision metering pump for supplying a varnish, a variable speed motor for driving the pump, a pipe for guiding the varnish from the pump to the applicator according to claim 1, and a pump for adjusting the rotation speed of the variable speed motor. An enamel wire manufacturing apparatus having an adjusting mechanism capable of controlling the varnish delivery amount of