JPS6146939B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for forming a sealing peripheral surface of a sealed beam lamp having an irregular shape such as a square shape.

Sealed beam lamps are generally constructed by abutting a front lens and a reflector at their abutting edges, but the shape of this sealing periphery determines the outline of the lamp, so In addition to mounting requirements, it is necessary to finish with high precision.

However, in the case of a round sealed beam lamp, after the front lens and reflector are welded and sealed together, a forming roller is brought into contact with the circumferential surface of the sealing and the forming roller is rolled along the circumferential surface of the sealing. However, for lamps with non-circular sealing surfaces such as rectangular shapes, it is difficult to keep the forming roller in constant rolling contact with the sealing surface at a constant speed, especially at the corner portions of the sealing surface. In this case, the moving speed of the forming roller became extremely high, making it impossible to form this part with high precision.

This invention was made based on the above circumstances, and its purpose is to prevent the moving speed of the forming roller that is in contact with the sealing peripheral surface of an irregularly shaped lamp from changing significantly, and to It is an object of the present invention to provide a sealing peripheral surface forming apparatus for a beam-shaped lamp that can be finished with high precision over a period of time.

An embodiment of the present invention will be described below based on the drawings.

In the figure, 1 is a base, and a sleeve 2 is fixed through the base 1. A drive shaft 3 is rotatably held through the sleeve 2, and a driven sprocket 4 is attached to the upper end of the drive shaft 3. This driven sprocket 4 is rotated by the motor 6 with a chain 8 interposed between it and a driving sprocket 7 which is mounted on the base 1 via a mounting base 5 and rotated by a motor 6. A rotary disk 9 is integrally attached to the lower end of the drive shaft 3, and as the drive shaft 3 rotates, the rotary disk 9 rotates at a constant speed in the direction of arrow A within a horizontal plane. There is. Guide holes 10, 10 are formed in this rotary disk 9 along the radial direction centering on the drive shaft 3, and these guide holes 10,
Slides 11, 11 are attached to each of the slides 10 so as to be slidable in the radial direction. Pipes 12, 12 are provided vertically penetrating through the slides 11, 11, and correction rollers 13, 13 are rotatably pivoted on the outside of the upper ends of these pipes 12, 12. Therefore, the correction roller 13,
13 is configured to move integrally with the slides 11, 11 in the radial direction. Also, the above pipe 1
2 and 12 are rotatably penetrated by shafts 14 and 14, and arms 15 and 15 are integrally attached to the lower ends of these shafts 14 and 14, and molded parts are attached to the tips of these arms 15 and 15. Rollers 16, 16 are rotatably supported. These forming rollers 16, 16 are adapted to come into contact with the circumferential surface of the joint sealing portion between the front lens R and the reflector L of the irregular beam-shaped lamp, that is, the circumferential surface of the sealing portion S. Further, other arms 17, 17 are integrally fixed to the upper ends of the shafts 14, 14, and copying rollers 18, 18 are rotatably attached to the tips of these arms 17, 7. Note that the amount of eccentricity of the forming rollers 16, 16 from the shaft 14 is equal to the amount of eccentricity of the forming rollers 16, 16 from the shaft 14.
It is desirable that the amount of eccentricity from the shaft 14 is the same as that of the shaft 14. Further, levers 19, 19 are protruded from the base ends of the arms 17, 17, and this lever 1
Coil springs 21, 21 are bridged between levers 20, 20 protruding from the rotary disk 9 at the ends of the rotary disks 9, 19. These coil springs 21, 21 are tension coil springs that always attract the levers 19, 19, thereby urging the copying rollers 18, 18 to press against a cam surface 27 of a copying cam 26, which will be described later. Further, levers 22, 22 in the shape of an inverted T are suspended from the lower surfaces of the slides 11, 11, respectively, and coil springs 23, 23 are bridged between these levers 22, 22. These coil springs 23, 23 are also tension coil springs, which urge the slides 11, 11 to approach each other, thereby moving the correction rollers 13, 13 onto the cam surface 25 of a correction cam 24, which will be described later. It is pressed into contact. At the lower end of the sleeve 2 hanging down from the base 1, a correction cam 2 is provided which has a cam surface 25 having an outline shape as shown in FIG.
4 is fixed. and the correction roller 1
3 and 13 are adapted to roll along this cam surface 25. Further, above the correction cam 24, the copying cam 26 is integrally fixed to the sleeve 2, and the copying rollers 18, 18 are rotatably abutted on the outer cam surface 27 of the copying cam 26. It is something that is in contact with. The cam surface 27 of the copying cam 26 has a similar shape to the sealing circumferential surface S of the lamp A.

The operation of the embodiment with such a configuration will be explained.

A lamp in which the peripheral edges of the front lens R and the reflector L are heated and melted and pressed together to seal them is inserted between the forming rollers 16, 16 while the sealing is still softened.
6 and 16 are brought into contact with the sealing peripheral surface. In this state, when the motor 6 is driven to rotate the drive shaft 3 at a constant speed, the rotary disk 9 rotates at a constant speed in the direction of arrow A. However, the shafts 14, 14 are
The copying rollers 18, 18 attached via the arms 17, 17 attempt to rotate together with this rotary disk 9. At this time, the levers 19, 19 protruding from the bases of the arms 17, 17 are connected to the coil springs 2.
1 and 21, the copying rollers 18 and 18 are always pressed against the cam surface 27 of the copying cam 26. Therefore, as the rotary disk 9 rotates, the copying rollers 18 and 18 are pulled by the copying rollers 18 and 21. It moves in the direction of arrow B along the circumferential cam surface 27 of the copying cam 26. Therefore, the arms 15, 1 are attached to the lower ends of the shafts 14, 14.
The forming rollers 16, 16 attached via 5 are
Since it moves along the same locus as the copying rollers 18, 18, it rolls into contact with the sealing circumferential surface S while correcting it. In this case, since the urging force of the coil springs 21, 21 is transmitted to the forming rollers 16, 16 via the rotating urging force of the shafts 14, 14, an appropriate pressing force is applied to the sealing peripheral surface S. It is being By the way, the copying rollers 18, 18 roll on the cam surface 27 of the copying cam 26, but since this cam surface 27 is not a perfect circle and the rotary disk 9 is rotating at a constant speed, the copying roller 18 , 18 are different at each position on the cam surface 27, and as a result, the running speeds of the forming rollers 16, 16 are no longer constant. That is, in FIG. 2, when the copying rollers 18, 18 come to the respective positions of points a, b, and c on the copying cam 26 as the rotary disk 9 rotates, these points correspond to the center point of the drive shaft 3. The distances from 0, that is, the radii r _a , r _b , and r _c are different from each other, and there is a relationship of r _c <r _a <r _b . However, since the rotary disk 9 is rotating at a constant speed, the traveling speed of the copying rollers 18, 18 in the direction of arrow B at each point a, b, c increases from point a to point b.
It shows a tendency to decelerate after passing point b and reaching point c.

However, as the rotary disk 9 rotates, the correction rollers 13, 13 roll along the cam surface 25 of the correction cam 24. That is, since the slides 11, 11 supporting the correction rollers 13, 13 are urged to approach each other by the coil springs 23, 23, the correction rollers 13, 13 contact the cam surface 25 of the correction cam 24. come into contact with The cam surface 25 of the correction cam 24 has a shape as shown in FIG. It is also displaced inwardly in the recessed portion. Therefore, the slides 11, 11 follow the correction rollers 13, 13 and slide on the rotary disk 9 in the direction of arrow C and in the opposite direction. When the slides 11, 11 are displaced in the direction of arrow C, the shafts 14, 14 supporting the copying rollers 18, 18 are also displaced together, so that the levers 19, 19 are pulled by the coil springs 21, 21. and rotate in the direction of arrow D. This rotation is the copying roller 1
8 and 18 in the direction of arrow B. Therefore, when the slides 11, 11 are moved outward, the speed of the copying rollers 18, 18 is increased, and when the reverse slides 11, 11 are moved inward, the speed of the copying rollers 18, 18 is increased. It will slow you down. Therefore, in the range where the speed of the copying rollers 18, 18 is increased, the slide 1
If the slides 11, 11 are moved inward and the slides 11, 11 are moved outward in the range where the copying rollers 18, 18 are decelerated, the copying roller 1
The speeds on the cam surfaces 27 of the copying cams 26 8 and 18 can be made equal. Note that the shape of the correction cam 24 is determined by parameters such as the rotational angular velocity of the rotary disk 9, the shape of the copying cam 26, and the lengths of the arms 15, 15 and 17, 17, etc.

FIG. 3 shows an example of the shapes of the copying cam 26 and the correction cam 24. In short, the copying cam 26 used in the present invention
has substantially the same shape as the contour of the sealing peripheral surface of the lamp, and the correction cam 24 contacts the correction cam 24 of the correction roller 13 in the area where the copying roller 18 passes the corner portion P of the copying cam 26. It is sufficient that the cam has a shape that reduces the radius r of the contact position.

As described in detail above, according to the present invention, the running speed of the copying roller that rolls into contact with the copying cam is controlled by a slide having a shaft that eccentrically supports the copying roller and a correction roller that moves along the correction cam. Since the correction is made by displacement in the radial direction, the moving speed of the forming roller integrally attached to the copying roller is prevented from becoming extremely fast at the corner portions of the sealing peripheral surface. Therefore, the sealing peripheral surface can be finished with high accuracy over its entire circumference, and a homogeneous lamp can be formed.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a side view and FIG. 2 being a sectional view taken along the line -- in FIG. FIG. 3 is a plan view showing an example of the shapes of the copying cam and the correction cam. 3... Drive shaft, 9... Turntable, 11, 11...
Slide, 13, 13... Correction roller, 14, 1
4...Shaft, 15, 15...Arm, 16,
16... Forming roller, 17, 17... Arm, 1
8, 18... copying roller, 21, 21... coil spring, 23... coil spring, 24... correction cam,
26...Imitation cam.

Claims (1)

[Claims] 1. A rotary disk rotated by a drive shaft is provided with a slide that is movable in the radial direction thereof and a correction roller that moves integrally with the slide and is rotatable, biased toward the center of the drive shaft, and A copying roller is provided eccentrically at the upper end of a shaft penetrating the slide, and a forming roller is provided eccentrically at the lower end of this shaft for contacting the sealing peripheral surface of the lamp, and the copying roller is attached to a copying cam arranged around the drive shaft. At the same time, the correction roller is brought into rolling contact with a correction cam disposed around the drive shaft, and the cam surface of the copying cam has a shape substantially the same as the outline of the sealing peripheral surface of the lamp. Further, the cam surface of the correction cam is characterized in that it has a cam shape that reduces the radius of the position where the correction roller contacts the correction cam in a region where the copying roller passes through a corner portion of the copying cam. A device for forming the sealing surface of beam-shaped lamps.