JPH0544776B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a heater lamp used in copying machines, facsimiles, printers, laminators (equipment for covering the surface of sheet-like objects with plastic film), etc. In particular, the present invention relates to a method of manufacturing a heater lamp having a short circuit for switching heat generation length.

[Background of the invention]

In recent years, fixing devices or laminators used in copiers, facsimile machines, printers, etc. have been using long lengths as heat sources because they have short waiting times, can be made smaller, and can reduce power consumption. A rod-shaped heater lamp is used.

For example, in an example of a fuser for a copying machine, a heating roller is provided with a long heater lamp arranged inside the cylinder so as to extend in the direction of the cylinder axis, and a pressure roller is placed in opposition to the heating roller. A fixing device is configured, and when the transfer paper to which the toner has been transferred passes through a contact area between the heating roller and the pressure roller, the toner is heated and melted and the toner is fixed onto the transfer paper. The length of the heating roller is usually set based on the width of the transfer paper that has the largest width among the transfer papers used, and the length of the heating roller is usually set based on the width of the transfer paper that has the maximum width. A filament is used that has a heat generating section with a length corresponding to the maximum width of the transfer paper used.

However, when using a heater lamp with such a configuration, when fixing toner using a narrow transfer paper, such as B5 size transfer paper, by transporting the short side of the paper perpendicular to the axis of the heating roller, Because the heating roller also heats the extra end roller portion that does not come into contact with the narrow transfer paper, extra power that does not contribute to fixing the toner is consumed, resulting in a large power loss, and the fixing by the narrow transfer paper is also heated. When this process is repeated many times in succession, the temperature of the roller in the area where the transfer paper comes into contact tends to drop as heat is absorbed by the transfer paper and toner, while the temperature of the roller in the area where the transfer paper does not come into contact tends to decrease. As a result, the temperature in the longitudinal direction of the roller becomes uneven, causing unevenness in the linear speed of the roller. There are problems in that good fixing cannot be achieved due to wrinkles or uneven fixing.

In order to eliminate such problems, the present inventor first developed a tubular enclosure, a filament arranged to extend along the tube axis of the tubular enclosure, and a heat generating portion of the filament. We proposed a heater lamp equipped with a short-circuit path that changes the heat generation length by short-circuiting a part of the lamp (Utility Application No. 101680, 1983;
(See Publication No. 101681).

The proposed heater lamp has conventionally been manufactured by the following method. That is, as shown in FIG. 7, after mechanically connecting the ring-shaped supporter 14 and the coil-shaped connecting member 16 to the elongated filament 1, one of the internal lead rods 11 for the filament is connected to the coil portion at one end of the filament 1. One end is inserted and the two are spot welded, a metal foil 31 is spot welded to the other end of this internal lead rod 11, and an external lead rod 41 is spot welded to this metal foil 31. Then, in the same manner, the other internal lead rod 13 for the other filament is attached to the coil portion at the other end of the filament 1.
One end of the metal foil 33 is inserted and the two are spot welded, a metal foil 33 is spot welded to this, and an external lead rod 43 is spot welded to this metal foil 33.

On the other hand, as shown in FIG. 8, a connecting coil part 61 is formed at one end of the short-circuiting internal lead rod 12, and a stopper coil member 62 of a glass thin tube is formed.
is prepared, and the short-circuiting external lead rod 42 is spot-welded to the short-circuiting metal foil 32 to be later connected to the other end of the short-circuiting internal lead rod 12.

Then, the assembly material obtained as described above is degreased if necessary, and then the oxides generated in the metal material during welding are reduced.

Then, as shown in FIG. 9, one end of the coiled connecting member 16 connected to the filament 1 is press-fitted into the connecting coil portion 61 at one end of the short-circuiting internal lead rod 12 for connection. Next, as shown in FIG. 10, the short-circuiting internal lead rod 12 is inserted into the glass thin tube 15, and the glass thin tube 15 is attached so that the other end of the internal lead rod 12 protrudes. Then, the stopper coil member 62 is fitted into the short-circuiting external lead rod 12 so as to come into contact with the glass thin tube 15, and this is fixed by caulking. Short circuit metal foil 32
spot weld.

The filament assembly obtained as described above is inserted into a tubular seal (not shown), and the metal foils 31 and 32 at one end of the filament assembly are sealed airtight by the end glass of the tubular seal. The metal foil 33 on the other end side of the filament assembly is hermetically welded to the end glass of the tube type sealing body to form one sealing part. A heater lamp is obtained.

[Problem that the invention seeks to solve]

However, in the above manufacturing method, there is a step of spot welding the shorting internal lead rod 12 and the shorting metal foil 32 after the reduction treatment of the material metal, so in this spot welding,
It has been found that there is a risk that the short-circuiting internal lead rod 12 and the metal foil 32 will be oxidized again and deteriorated, resulting in a problem that the service life of the heater lamp will be shortened.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and its object is a method for manufacturing a heater lamp having a short circuit for switching heat generation length and having a long service life without deterioration due to oxidation. Our goal is to provide the following.

[Means for solving problems]

The method for manufacturing a heater lamp of the present invention short-circuits a tubular enclosure, a filament arranged to extend along the tube axis of the tubular enclosure, and a part of the heat generating part of the filament to short-circuit the heat generating length. A method for manufacturing a heater lamp comprising a switching short circuit, characterized by including the following steps (1) to (6).

Step (1) One of the inner lead rods for filament and the inner lead rod for shorting are fixed to a glass fixing member while being separated from each other, and metal foil is welded to the ends of these inner lead rods. The process of welding external lead rods to each end of the metal foil.

Step (2) A step of welding a metal foil to the other internal lead rod for the filament, and welding an external lead rod to this metal foil.

Step (3) Connecting one end of the filament to the one internal lead rod for filament and welding them together, and connecting the other end of the filament to the other internal lead rod for filament and welding the two.

Step (4) A step of reducing oxides generated in the metal material of the assembly produced through steps (1) to (3).

Step (5) A step of attaching the glass capillary to a state where the short-circuiting internal lead rod is inserted into the glass capillary and one end of the internal lead rod protrudes.

Step (6) Mechanically connecting one end of the coiled connecting member to the end of the shorting internal lead rod protruding from the glass capillary, and mechanically connecting the other end of the coiled connecting member to the shorting position of the filament. Process.

According to this method, the internal lead rod for the filament and the internal lead rod for shorting are fixed using a glass fixing member, and all necessary welding operations such as welding with metal foil and welding with the filament are performed. ,
In order to reduce the oxides generated in the material metal, and then attach the glass capillary to the shorting internal lead rod, and connecting the coiled connecting member to the filament and the shorting external lead rod by mechanical connection means, In the reduction treatment of the oxides generated in the material metal, a filament assembly can be produced without any welding work, and as a result, after the reduction treatment of the oxides generated in the material metal, the oxides generated in the material metal are reduced. There is no risk of deterioration due to oxidation.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

In one embodiment of the present invention, the following steps (1) to (6) are performed in this order.

Step (1) As shown in FIG. 1, one filament internal lead rod 11 made of, for example, tungsten,
For example, the internal short-circuiting lead rod 12 made of tungsten is fixed by a common glass fixing member 2 at an appropriate distance apart so as not to come into contact with each other.

Then, as shown in FIG. 2A, a metal foil 31 made of, for example, molybdenum is spot-welded to one end of one of the internal lead rods 11 for the filament, and a short circuit made of, for example, molybdenum is placed on one end of the internal lead rod 12 for shorting. For example, the metal foil 32 is spot welded. Then, an external lead rod 41 made of, for example, tungsten is spot-welded to the other end of the metal foil 31, and an external short-circuiting lead rod 42 made of, for example, tungsten is spot-welded to the other end of the short-circuiting metal foil 32.

Step (2) As shown in FIG. 2B, a metal foil 33 made of, for example, molybdenum is spot-welded to one end side of the other internal lead rod 13 for filament, and a metal foil 33 made of, for example, molybdenum is welded to the other end of the metal foil 33. For example, the external lead rod 43 is spot welded.

Step (3) As shown in FIG. 3, metal ring-shaped supports 14 are wound and fixed at appropriate positions of the elongated filament 1 made of, for example, tungsten.

Then, as shown in FIG. 4, one end of the filament internal lead rod 11 is inserted into the end coil part on the one end side of the filament 1, and the two are, for example, spot welded, and the end coil part on the other end side of the filament 1 is One end of the inner lead rod 13 for filament is inserted into the inner lead rod 13, and the two are welded together, for example, by spot welding.

Then, as shown in FIGS. 5A and 5B, a coiled connecting member 16 made of tungsten, for example, for connecting the short-circuiting internal lead rod 12 and the filament 1 is manufactured. This coiled connecting member 16
For example, it has a small diameter coil part 17 at one end for inserting the short-circuiting internal lead rod 12, and has a hook-shaped locking part 18 at the other end for hooking and connecting to the filament 1. Become.

Step (4) Reduction treatment of oxides generated in the metal material of the assembly and the coiled connecting member 16 produced through the steps (1) to (3) is performed. That is, the steps (1) to
In (3), oxides are formed on the surface of the metal material during welding, and these oxides tend to cause early deterioration of the metal foil or internal lead rod. Perform processing. This reduction treatment is performed, for example, by heat treatment for about 10 minutes in high-temperature hydrogen gas at a temperature of 1000°C.
On the other hand, before performing the above reduction treatment, the material metal may be subjected to degreasing treatment if necessary.

Step (5) As shown in FIG. 6, the short-circuiting internal lead rod 12 is inserted into the inside of the transparent glass thin tube 15 made of quartz glass, for example, and one end of the internal lead rod 12 protrudes. The glass thin tube 15 is pushed in and attached. This glass tube 1
In the installation work of step 5, the glass fixing member 2 also functions as a stopper. Therefore, there is no need to provide a stopper member.

Step (6) Then, the hook-shaped locking part 18 at the other end of the coiled connecting member 16 is hooked to the short-circuit position of the filament 1 to mechanically connect it, and a glass The other end of the short-circuit internal lead rod 12 protruding from the thin tube 15 is press-fitted to mechanically connect the two in a slidable manner. In this step, mechanical connection means is used instead of welding connection means.

Then, the filament assembly produced through the above steps (1) to (6) is inserted into a tube-shaped enclosure 5 made of quartz glass, for example, as shown in FIG. The metal foils 31 and 32 are hermetically welded to the end glass of the tubular sealing body 5 to form one sealing part 51, and the metal foil 33 on the other end side of the filament assembly is welded to the end glass of the tubular sealing body 5. The other sealing part 52 is formed by airtightly welding the end glass,
After necessary exhaust gas and gas are filled in through an exhaust pipe (not shown), the exhaust pipe is hermetically sealed. Then, when necessary, a base is provided for each of the sealing parts 51 and 52.

According to the above embodiment, the filament internal lead rod 11 and the short-circuiting internal lead rod 12 are fixed by the glass fixing member 2, and it is necessary to weld them to the metal foils 31 and 32, weld them to the filament 1, etc. After performing all the welding operations and reducing the oxides generated in the metal material, the glass thin tube 15 is attached to the short-circuiting internal lead rod 12, and the coiled connecting member 16 is connected by mechanical connection means. Since it is connected to the filament 1 and the short-circuiting internal lead rod 12, the filament assembly can be fabricated without any welding work after the reduction treatment of oxides generated in the material metal. After the oxides generated during the reduction treatment, there is no risk of deterioration due to oxidation caused by welding, and the heater can be used stably for a long period of time without causing early deterioration of the metal foil and internal lead rod. Lamps can be manufactured.

Although one embodiment of the present invention has been described above, the method of the present invention can be applied to the manufacture of heater lamps used as heat sources for facsimile machines, printers, or laminators as well as heater lamps used as heat sources for fusing in copying machines. I can do it.

〔Effect of the invention〕

As explained above, according to the method for manufacturing a heater lamp of the present invention, the internal lead rod for the filament and the internal lead rod for shorting are fixed by a glass fixing member, and the welding with the metal foil and the welding with the filament are performed. After performing all the necessary welding work, such as reduction of oxides generated in the metal material, the glass capillary is attached to the shorting internal lead rod, and the coiled connection member is connected by mechanical connection means. Since it is connected to the filament and the external lead rod for shorting, the filament assembly can be fabricated without any welding work after the reduction treatment of the oxides generated in the material metal, and as a result, the filament assembly can be manufactured without any welding work. In the reduction treatment of oxides, there is no risk of deterioration due to oxidation caused by welding, and as a result, we produce heater lamps that can be used stably for long periods of time without causing early deterioration of the metal foil and internal lead rods. can do.

[Brief explanation of the drawing]

FIGS. 1 to 7 are explanatory diagrams showing an embodiment of the present invention in order of steps, and FIGS. 8 to 11 are explanatory diagrams showing in order of steps an example of a conventional heater lamp manufacturing method. 1... Filament, 11, 13... Internal lead rod for filament, 12... Internal lead rod for short circuit, 1
4... Ring-shaped supporter, 15... Glass thin tube, 1
6... Coiled connection member, 2... Glass fixing member,
31, 32, 33...metal foil, 41, 42, 43...
External lead rod, 5... tube type sealing body, 51, 52... sealing part.

Claims (1)

[Claims] 1. A tubular enclosure, a filament arranged to extend along the tube axis of the tubular enclosure, and a short-circuit path that short-circuits a part of the heat-generating portion of the filament to switch the heat-generating length. 1. A method for manufacturing a heater lamp having a short circuit for switching heat generation length, the method comprising: steps (1) to (6) below. Step (1) One of the inner lead rods for filament and the inner lead rod for shorting are fixed to a glass fixing member while being separated from each other, and metal foil is welded to the ends of these inner lead rods. The process of welding external lead rods to each end of the metal foil. Step (2) A step of welding a metal foil to the other internal lead rod for the filament, and welding an external lead rod to this metal foil. Step (3) Connecting one end of the filament to the one internal lead rod for filament and welding them together, and connecting the other end of the filament to the other internal lead rod for filament and welding the two. Step (4) A step of reducing oxides generated in the metal material of the assembly produced through steps (1) to (3). Step (5) A step of attaching the glass capillary to a state where the short-circuiting internal lead rod is inserted into the glass capillary and one end of the internal lead rod protrudes. Step (6) Mechanically connecting one end of the coiled connecting member to the end of the shorting internal lead rod protruding from the glass capillary, and mechanically connecting the other end of the coiled connecting member to the shorting position of the filament. Process.