JPH05304061A - Forming method and device of film capacitor - Google Patents

Abstract

PURPOSE:To enhance film capacitor provided with a lead wire in accuracy and manufacturing yield by a method wherein a rolled film capacitor element is pre-compressed directly with a single hot press synchronizing with a winding speed through the intermediary of a pickup hand provided between a winder and a hot press. CONSTITUTION:An transfer arm 1 holds a rolled film capacitor element 11 by sucking and immediately transfers it to the pressing surface of a press 2 turning by an angle of 90 deg., and the film capacitor element 11 is pre-compressed. When the film capacitor element 11 is pinched between a stationary head block 2a and a pressing heat block 2b, the transfer arm 1 turns to pick up a following rolled film capacitor element 11. As mentioned above, a film capacitor is pre- compressed before it is formed by a compression process proper, so that it is kept in the same rolling state as it is rolled in a rolling process and prevented from changing in electrostatic capacitance in an after process after it is rolled up, and consequently a film capacitor of this design can be prevented from varying in quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a film capacitor with a lead wire and a molding apparatus interposed in the manufacturing process.

[0002]

2. Description of the Related Art A film capacitor with a lead wire is formed by alternately laminating a dielectric film and an electrode foil, and winding and forming while leading out a lead wire. Conventionally, it has been used in a state where the tolerance of its capacitance is not so required. Since the capacity tolerance was allowed to be about ± 10%, the manufacturing was not so strictly controlled, and even if there was some looseness in the winding process after the winding process, it will be sent as it is. It was being done.

[0003]

Recently, film capacitors with lead wires have been used for high-definition applications and the like, and high precision with a capacity tolerance of ± 1 or 2% has been demanded. Therefore, if there is a large variation in electrostatic capacitance as in the conventional case, there is a problem that many things are treated as defective products. The present invention is intended to solve this point.

[0004]

In order to solve the above problems, the present invention provides a winding machine for winding a dielectric film and an electrode foil while leading a lead wire and then heating and compressing the film to form a film capacitor element. The film capacitor element directly wound between the hot press and the delivery hand,
(A) One hot press pre-compresses in synchronization with the winding speed, or (b) the hot presses are sequentially supplied to a plurality of aligning hot presses in synchronization with the winding speed, and main compression is performed for a predetermined time, or (C) While sticking between the two tapes, (a) or
It was decided to perform pre-compression or main compression in the step (b).

The apparatus therefor comprises a transfer arm 1 which receives a film capacitor element from a film condenser winder and carries the film capacitor element to the pressing surface.
And a pressing device 2 having a pressing surface at the supply position of the film capacitor element by the transfer arm 1 thereof.

The transfer arm 1 is preferably a revolving arm having a magnet hand 1a at its tip, and the press device 2 has a fixed heat block 2a and a cylinder driven pressing heat block.
The one consisting of 2b is preferable.

[0007]

According to the present invention, since the film capacitor is pre-compressed before being formed by the main compression, the winding state in the winding process is maintained as it is, and the electrostatic capacity is maintained during the post-process after the winding process. Does not change, and product variation can be suppressed. If you sequentially deliver to multiple hot presses,
Sufficient pressing time can be taken and main compression can be done at once.
Further, if pre-compression or main compression is performed while sandwiching and arranging the lead wires of the wound capacitor directly on the two tapes, it is possible to immediately shift to the post-processing.

[0008]

1 is a front view showing an embodiment of the apparatus of the present invention, and FIG. 2 is a view taken along the line A--A in FIG. This device
Between the winder 10 for winding the dielectric film and the electrode foil while pulling out the lead wire and the press device 2, the transfer arm 1 for turning the hand part to receive the film capacitor element 11 and put it on the press surface is provided. is there. This transfer arm 1 is fixed at its base side to a rotary cylinder 3 provided on the upper part of a pillar-shaped bracket standing upright on the main body of the apparatus, whereby it can swivel approximately 90 ° as shown in FIG. The tip of the transfer arm 1 is a magnet hand 1a,
This attracts the lead wire of the film capacitor element.

When the film capacitor element after winding is adsorbed and held, the transfer arm 1 immediately swivels about 90 ° to carry the film capacitor element to the press surface of the press device 2 and pre-compressed by the press device 2. The pressing device 2 comprises a fixed heat block 2a and a pressing heat block 2b driven by a cylinder 4. Both the fixed heat block 2a and the pressing heat block 2b have heating elements. Further, when the film condenser element 11 is sandwiched between the fixed heat block 2a and the pressing heat block 2b, the transfer arm 1 pivots to pivot to receive the film condenser element 11 wound up next. The pre-compression of the previous film capacitor is completed within a short time until the transfer arm 1 sends the next film capacitor element, the pressing heat block 2b returns, and the pre-compressed film capacitor is dropped and transferred to the container.

FIG. 3 is a plan view of an apparatus capable of pre-compression or main compression while sandwiching and aligning the lead wires of a capacitor after being wound directly on two tapes. In this device, a press device including a plurality (six) of hot presses 20a to 20f is provided on a support base 21, and the entire press device is also movable on rails 22 and 22. Each of the hot presses 20a to 20f can be individually compressed and its operation is automatically controlled. The two tapes 23a, 23b are supplied from two reels 24a, 24b on the left and right, and are wound under the hot presses 20a to 20f while sandwiching the lead wire at the supply position of the film capacitor element by the transfer arm 1. A free-standing film capacitor element is guided between the hot presses 20a to 20f. When the leading film capacitor element 11 reaches the leftmost hot press 20a, any of the hot presses operates to perform a compression operation. During the hot pressing, the film capacitor element 11 is continuously wound up and sent by the transfer arm, so that the entire pressing device moves leftward in synchronization with the speed. When hot pressing is performed for a certain period of time, the pressing device returns to its original state and hot pressing of the uncompressed film capacitor element is performed again. With this, if pre-compression or main compression is performed, it is possible to immediately shift to post-processing.

As another device for heating and pressing the film condenser elements 11 after winding them up and in synchronism with successive ones sent by the transfer arm, there is an endless strip-shaped device in which two film condenser elements rotate in opposition. A method is also effective in which the film capacitor element 11 guided by the hot press is heated for a certain period of time while sequentially sandwiching and pressing the film capacitor element 11 sent by the transfer arm.

Film capacitor element 11 that has been precompressed
In this way, (a) after precompressing with one hot press in synchronization with the winding speed and then individually moving this to main compression,
(B) It is sequentially supplied to a plurality of hot presses that are aligned and moved in synchronism with the winding speed, and after pre-compression for a predetermined time, it is transferred to main compression, or (c) while being sandwiched between two tapes. The pre-compression or main compression is performed in the above step (a) or (b).

[0013]

As described above, according to the present invention, the high precision of the film capacitor with lead wire is achieved and the yield of the product is improved.

[Brief description of drawings]

FIG. 1 is a front view of a film capacitor forming apparatus of the present invention.

FIG. 2 is a view on arrow AA in FIG.

FIG. 3 is a plan view of another embodiment of the film capacitor forming apparatus of the present invention.

[Explanation of symbols]

 1 Transfer Arm 2 Press Machine 3 Rotary Cylinder 11 Film Capacitor Element

Claims (3)

[Claims] 1. A dielectric film and an electrode foil are wound while leading out a lead wire and then heated and compressed to form a film capacitor element, and a delivery hand is interposed between a winding machine and a hot press. Directly pre-compress the film capacitor element after winding with one hot press in synchronization with the winding speed, or (b) synchronize with multiple winding hot presses in line with the winding speed. Or (b) while sandwiching between the two tapes, the main compression is performed for a predetermined time, or (a) or (b) above.
A method for forming a film capacitor, which comprises performing pre-compression or main compression in the step of. 2. A transfer arm 1 for receiving a film capacitor element from a winding machine and carrying the film capacitor element to a press surface, and a pressing device 2 having a press surface for supplying the film capacitor element by the transfer arm 1. Forming equipment for film capacitors. 3. The transfer arm 1 according to claim 2 is a swivel arm having a magnet hand 1a at its tip, and the press device 2 is a film condenser comprising a fixed heat block 2a and a cylinder-driven pressing heat block 2b. Molding equipment.