JP2007335293A - Lighting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that a conventional lighting apparatus attached to a sewing machine, etc. , only lights a working area, so, when a color of a thread is changed during embroidery stitching, aiming for a needle dropping part is difficult when giving continuity with a part stitched before. <P>SOLUTION: The lighting apparatus is composed of a light source 3, a lens 5, a standard plate 4 retained between the light source and the lens, and a screen 6 installed on a side opposing the light source with respect to the lens. A reference pattern 4a provided to the standard plate by adjusting spacing between the lens and the standard plate is projected to the screen at a desired magnification. By using the position of the reference pattern as a reference position for work, working point is made clear and the problem is solved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lighting device. Specifically, the illumination device has a relatively narrow irradiation range, and an indicator (reference position) for displaying a center or the like by brightness, color, shape, or the like is displayed in the irradiation range. The present invention relates to a lighting device configured as described above.

  An example of a conventional illuminating lamp 90 used for this type of purpose is shown in FIG. 6 as an example of an illuminating lamp for a sewing machine, and this illuminating lamp 90 is provided in the vicinity where a sewing needle of a sewing machine is attached, An LED 91 is provided above, and beam-like light is projected toward a condensing lens 92 provided at an appropriate position below.

  Therefore, the condensing lens 92 further narrows down the light from the LED and irradiates the place where the needle of the cloth presser 93 penetrates the cloth, that is, the vicinity of the so-called needle drop. In this way, for example, when setting the sewing start position when performing pattern sewing, or by changing the color of the thread to change the color of the pattern, sewing is performed so that there is no break in the pattern. When resuming, since spot-like illumination is performed in the vicinity of the needle drop, it is easy to determine the position where the needle 94 is dropped first.

Therefore, the continuity of the pattern is improved and the finish of the product is improved, and in this type of sewing work, the needle drop portion is likely to be hand-darkened, so the burden on the operator is reduced. In some cases, the blinking of the LED is interlocked with the sewing needle stop device 95 and is lit only when the sewing machine is operating.
JP-A-57-69884

  However, in the above-described conventional illumination device 90, as shown in FIG. 7, the vicinity of the needle drop is illuminated as a substantially circular or substantially elliptical illumination range L having an appropriate area. There is no difference in the needle drop being performed, but it is not certain at which position within the irradiation range L the needle drop is performed.

  Further, when there are a plurality of sewing machines, it is naturally considered that an attachment error occurs in the attachment of the illumination device 90 by each sewing machine, and there is a slight difference in the position of the needle drop even in the irradiation range L described above. There is a possibility that there is a problem such as a quality difference in the finished product depending on the skill level of the worker.

  The present invention provides, as specific means for solving the above-described conventional problems, a light source, a lens, a standard plate held between the light source and the lens, and the light source facing the lens. A reference pattern formed on the standard plate is projected on the screen as a desired magnification by adjusting a distance between the lens and the standard plate. The problem is solved by providing an illuminating device characterized by using a position as a reference position for illumination.

  According to the present invention, for example, a line crossing a cross, a point of an appropriate size, or an arc is projected within the irradiation range L, and if these points or intersections are sewing machines, a needle drop By matching the points, it is possible to form accurate patterns and improve product quality without affecting the skill level of workers by working with the points or intersections as targets. An excellent effect is achieved.

  Next, the present invention will be described in detail based on the embodiments shown in the drawings. What is shown by the code | symbol 1 in FIG. 1 is the illuminating device which concerns on this invention, and has shown in the state which abbreviate | omitted the upper half part 2a of case 2 in order to show a structure clearly. Even in an actual lighting device, the upper half 2a is configured to be detachable so that the light source 3, the standard plate 4, and the lens 5 can be mounted at predetermined positions inside the case 2. Has been.

  The illuminating device 1 of the present invention is provided with a light source 3, a standard plate 4 and a lens 5 in the lower half 2b of the case 2. At this time, basically, the light source 3 The standard plate 4 and the lens 5 are arranged with reference to an axis passing through the center of the lens 5, that is, the optical axis Z.

  Therefore, the lower half 2b of the case 2 is formed as a structure suitable for holding the light source 3, the standard plate 4, and the lens 5, and the standard plate 4 is formed by the lens 5 as desired, as will be described later. It is assumed that an appropriate interval can be maintained so that the image is projected at a desired magnification. As will be described later, the screen 6 is omitted in FIG.

  FIG. 2 is an explanatory view showing the operation of the lighting device 1 according to the present invention. The light source 3, the standard plate 4, and the lens 5 are attached to the lower half 2b of the case 2 at predetermined intervals. As described above, the screen 6 is provided on the side of the lens 5 opposite to the standard plate 4.

  Here, when the focal length of the lens 5 to the standard plate 4 is f and the focal length to the screen side is f, the distance A from the focal length f (front focal point) on the light source 3 side to the standard plate 4; If the distance B from the focal length f (rear focal point) facing the lens 5 to the screen 6 is set so as to satisfy the formula: magnification M = (f / A) = (B / f), the standard plate 4 The image of the reference pattern 4a provided above is projected on the screen 6 with a desired magnification M.

  If the focal length f of the lens 5 is 30 mm for both the front and rear focal points, the reference pattern 4 a of the standard plate 4 can be obtained by setting 30 mm for A and 30 mm for B. M = 1 is projected onto the screen 6 at a magnification of 1. If 10 mm is set to A and 90 mm is set to B, the reference pattern 4a of the standard plate 5 is projected at a magnification of M = 3. It becomes.

  FIG. 3 shows the state of the reference pattern 4a of the standard plate 4 projected on the screen 6. For example, a cross-shaped reference pattern 4a is formed on the standard plate 4, and the reference pattern 4a By making the intersection point coincide with the needle entry point, it is easy to resume from a point that was continuous with the previously stopped point when resuming sewing, even after the sewing has been stopped and the thread has been changed. It can be implemented.

  Note that the reference pattern 4a is not limited to the above-described cross-line shape, and may be a shape that is easy to use according to the purpose, for example, a circular shape having an appropriate diameter or a black dot shape. For example, a plurality of standard plates 4 each having a different reference pattern 4a may be formed in advance, and the standard plate 4 may be replaced according to the situation.

  At this time, in the case of the standard plate 4 shown in FIG. 4, a hole having a circular cross section with an appropriate length between the light source 3 and the standard plate 4 in the upper half 2a and the lower half 2b of the case 2. A light guide tube 2c having a shape or the like is formed, and the inner surface of the light guide tube 2c is subjected to a mirror surface treatment 2d by vapor deposition of aluminum or the like so that the standard plate 4 is illuminated more brightly. The reference pattern 4a is formed, for example, on a diffusing surface or a transparent standard plate 4 by means of printing means of opaque paint or colored paint.

  Further, as shown in FIG. 5, instead of the standard plate 4, for example, a transparent cylindrical light guide 7 may be used. In this case, a standard surface is provided on the end surface of the light guide 7 on the lens 5 side. A reference pattern 7a similar to that formed on the plate 4 may be provided. Furthermore, the mirror surface treatment 7b may be performed on the cylindrical outer diameter of the light guide 7 by vapor deposition of aluminum, silver, or the like so that light leakage from the side surface (outer diameter surface) does not occur.

  Next, the light source 3 that supplies light to the standard plate 4 or the light guide 7 will be described. If the needle drop part is merely illuminated, the light source 3 may be a single color LED as appropriate. When it is necessary to use different color threads properly such as embroidery sewing, it is preferable to use a light source 3 that can reliably identify colors such as a white LED and a halogen lamp.

  Moreover, since the illumination device 1 of the present invention is not limited to a sewing machine, the brightness is higher when the enlargement ratio of the standard plate 4 is increased and precision work is performed based on the reference pattern 4a. It is also possible to use a metal halide discharge lamp with good color rendering.

  In the above description, the image of the reference pattern 4a that is projected on the screen 6 is not necessarily projected on the screen 6 when the actual lighting device 1 is used. For example, the image of the reference pattern 4a directly on the cloth to be sewn. Or may be projected directly onto an iron plate to be welded. However, even in that case, the position is set to the same distance from the lens 5 as the screen 6 is provided, and a desired magnification is obtained.

It is explanatory drawing which shows the structure of the illuminating device which concerns on this invention by the principal part. It is explanatory drawing which similarly shows the setting state of the whole structure of the illuminating device which concerns on this invention. It is explanatory drawing which shows the projection state on the screen of the illuminating device which concerns on this invention. It is explanatory drawing which shows the part of the light source and standard plate of the illuminating device which concerns on this invention. It is explanatory drawing which shows another Example of the illuminating device which concerns on this invention in the principal part. It is explanatory drawing which shows a prior art example. It is explanatory drawing which shows the example of the projection image of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Illuminating device 2 ... Case 2a ... Upper half part 2b ... Lower half part 2c ... Light guide tube 2d ... Mirror surface treatment 3 ... Light source 4 ... Standard plate 4a ... Reference pattern 5 ... Lens 6 ... Screen 7 ... Light guide 7a ... Reference | standard Pattern 7b ... Mirror finish

Claims (6)

  A light source, a lens, a standard plate held between the light source and the lens, and a screen installed on the side facing the light source with respect to the lens, the distance between the lens and the standard plate The illumination apparatus is characterized in that a reference pattern applied to the standard plate is projected on the screen as a desired magnification by adjusting and a predetermined position of the reference pattern is used as an illumination reference position.   The light source is provided with a light guide tube having a mirror-finished inner surface and an appropriate length, and the end of the light guide tube opposite to the light source is set as the setting position of the standard plate. The lighting device according to claim 1.   When the focal length of the lens is f, the distance between the standard plate and the focal point on the standard plate side of the lens is A, the distance between the screen and the focal point on the screen side of the lens is B, and the magnification is M The lighting device according to claim 1, wherein a positional relationship among the standard plate, the lens, and the screen is defined so as to satisfy the formula: M = (f / A) = (B / f).   The lighting device according to claim 1, wherein a film-like member on which a reference pattern of a desired pattern is baked is attached to an end portion of the light guide tube to serve as the standard plate.   The lighting device according to claim 1, wherein the reference pattern is provided on an end surface of the light guide near the lens. The lighting device according to any one of claims 1 to 5, wherein the light source is an LED, an incandescent bulb, a discharge lamp, or any other light emitter.

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