JP4296319B2 - Sewing machine with lighting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sewing machine with an illuminating device, and more specifically, it illuminates a needle drop position that is difficult to check with only room lighting, such as at night or in bad weather, and illuminates the progress of sewing work. The present invention relates to a sewing machine with a lighting device that can be easily and clearly grasped.
[0002]
[Prior art]
As a sewing machine with this kind of lighting device, for example, as disclosed in Japanese Patent Application Laid-Open No. 57-69884, a light emitting source using a semiconductor element such as a light emitting diode (LED) is attached to an upper part of a needle drop part, 2. Description of the Related Art Conventionally, it has been known that a light emitting operation is performed on the light source at the start of a sewing operation to locally project and illuminate a region around the needle drop portion.
[0003]
[Problems to be solved by the invention]
However, in the conventional sewing machine with a lighting device disclosed in the above publication, etc., the light source such as a light emitting diode is merely turned on / off in conjunction with the operation of the sewing machine, and the needle drop portion and its surroundings The amount of light emitted when the area is illuminated is constant. For this reason, if the light emission amount is set large so that the needle drop part and the surrounding area can be illuminated brightly, for example, when sewing white fabric or the like, the reflection of light is too strong and the visibility decreases, and eyestrain On the contrary, if the amount of light emitted is set small, the illuminance when passing the thread through the needle when the rotation of the sewing machine is stopped is insufficient, and the threading operation and the next sewing are performed regardless of the presence of local illumination. There was a problem that detailed work such as preparation of the work was very difficult.
[0004]
The present invention has been made in view of the above situation, and at the time of sewing work, while illuminating the vicinity of the needle drop part with appropriate illuminance to ensure good visibility, threading work when the rotation of the sewing machine is stopped, An object of the present invention is to provide a sewing machine with an illumination device that can illuminate brightly so that detailed operations such as preparation for the next sewing can be easily performed.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a sewing machine with an illumination device according to the present invention has a light emitting source using a semiconductor element that projects and illuminates locally toward a peripheral region around the needle drop portion. In a sewing machine with a lighting device in which a switch that is automatically turned on in conjunction with the operation of the sewing machine is interposed in a connection circuit between the light source and the power source, the light source and the power source In the connection circuit, in addition to the above switches, the first and second variable resistors with different resistance adjustment ranges and the amount of light emitted from the light source during normal sewing operations when the sewing machine is rotated are reduced. In addition, the second variable resistor connects the power source and the light source by the rotation detection signal and the rotation stop detection signal from the rotation sensor of the sewing machine so that the amount of light emitted from the light source increases when the rotation of the sewing machine is stopped. Through A changeover switch capable of automatically switching between the connection state and the connection state via the first variable resistor is interposed between each of the first and second variable resistors. Is characterized in that a manual volume capable of setting and adjusting the resistance values in different ranges is provided .
[0006]
According to the present invention having the above-described configuration, during normal sewing work, the amount of light emitted from the light emitting source is reduced, and the needle drop portion and its surrounding area are illuminated with an illuminance with little reflected light from the cloth to be sewn. It is possible to improve the visibility of the progress of the sewing work such as the confirmation of the position and reduce eye strain. In addition, when the sewing machine stops rotating, the amount of light emitted from the light emitting source is adjusted so that the needle drop area and the surrounding area are brightly illuminated, so that the needle threading work and the preparation for the next sewing are fine. It is possible to work easily and quickly.
[0007]
Moreover, since it is intended to automatically adjust the projection amount from the light emitting sources definitive at the time and rotation stop rotation by the detection signal of the rotation sensor of the sewing machine in two steps, without performing a troublesome work of adjusting the projection amount manually By simply operating the sewing machine as usual and rotating and stopping the rotation, the needle drop area and its surrounding area can be illuminated with low illuminance and excellent visibility during sewing work, and the rotation of the sewing machine can be stopped. Sometimes it can be automatically changed to illumination with illuminance that can easily perform fine work such as threading work and preparation for the next sewing.
[0008]
Moreover, as a sewing machine with an illuminating device according to the present invention, as described in claim 2 , it is applied to a sewing machine in which a plate-shaped safety guard made of a transparent material is provided at a position before the working position with respect to the needle drop portion. When doing this, the safety guard prevents the broken needles and debris generated during sewing work from hitting the eyes and face of the worker who is approaching the sewing location, while the needle drop location due to the presence of such a safety guard. It is possible to clearly check the progress of the sewing work regardless of the presence of the safety guard, by suppressing the deterioration of the visibility by the illumination.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view in which a part of a cylinder type sewing machine with an illumination device to which the present invention is applied is omitted, FIG. 2 is an enlarged perspective view of a main part thereof, and FIG. 3 is a left side view of FIG. The cylinder type sewing machine shown in each of these drawings is a needle that is supported in a reciprocating manner up and down on the head portion of the sewing machine arm 1 through a crank mechanism (not shown) horizontally mounted in the sewing machine arm 1. A needle 3 is fixed to the lower end of the rod 2 via a needle stopper 2A. A presser bar 4 that can be moved up and down is disposed on the sewing machine arm 1 at the rear of the needle bar 2, and a presser foot 5 is fixed to the lower end of the presser bar 4. Further, a needle plate 7 is provided on the upper surface of the cylinder-type bed 6 disposed opposite to the lower part of the sewing machine arm 1, and the needle plate 7 and the presser 5 have a vertical movement path of the needle 3. A needle drop portion 8 is formed. Since other configurations of the cylinder type sewing machine such as the cloth feeding device are well known, detailed description thereof will be omitted.
[0010]
A plate-like safety guard 9 made of a transparent resin material is provided at a position before the working position with respect to the needle drop portion 8 so as to be swingable around a fulcrum 10 set at an upper portion thereof. At the lower end of the head portion of the sewing machine arm 1 corresponding to the inside of the plate-shaped safety guard 9 and above the needle drop portion 8, there is a periphery around the needle drop portion 8 as shown by a virtual line K in FIG. A light emitting diode (hereinafter referred to as LED) 11 is attached as a light emitting source using a semiconductor element that locally projects light toward the region and illuminates the region .
[0011]
[0012]
[0013]
[0014]
Figure 4 is a block diagram showing a configuration of a projection amount adjusting device in a lighting apparatus with a cylinder-type sewing machine according to an embodiment of the present invention, during the connection circuit between the power source 12 and the LED 11, automatic in conjunction with the operation of the sewing machine In addition to the switch 13 that is turned on automatically, the first variable resistor 14A and the second variable resistor 14B having different resistance ranges, and the rotation detection signal and the rotation stop detection signal of the sewing machine by the rotation sensor 16 Is connected to the power source 12 and the LED 11 through the first variable resistor 14A via the changeover switch 17 when the rotation of the sewing machine is stopped, and when the sewing machine is rotated. The power supply 12 and the LED 11 can be automatically switched to the connection state through the second variable resistor 14B via the changeover switch 17. That. The first and second variable resistors 14A and 14B are provided with manual volumes 15A and 15B that can set and adjust their resistance values in different ranges.
[0015]
In the cylinder type sewing machine with the illumination device configured as described above , when the switch 13 is turned on and a predetermined sewing operation is performed in accordance with the operation of the sewing machine , depending on the light reflection characteristics of the material to be sewn , the brightness in the working room, and the like. advance the first and second variable resistors 14A, manual volume 15A the resistance of the 14B, by previously adjusted by 15B, followed by only perform common sewing operations like stop rotating or rolling the sewing machine, The sewing machine rotation detection signal and rotation stop detection signal from the rotation sensor 16 connect the power source 12 and the LED 11 via the second variable resistor 14B during normal sewing work, and the amount of light emitted from the LED 11 is reduced, resulting in a needle drop. Part 8 and be clearly visible despite the presence of security guard 9 the progress such as confirmation, such as sewing operation of the peripheral region With possible, while can be illuminated with a small intensity of eye strain, and a power supply 12 and LED11 during the stop of the rotation of the sewing machine projection amount from LED11 is connected via a first variable resistor 14A is automatically Thus, the area around the needle drop portion 8 can be illuminated with an illuminance that allows easy and quick operations in a very bright environment such as threading work and preparation for the next sewing .
[0016]
In each of the above-described embodiments, the description has been given of the one applied to the cylinder type sewing machine. However, the same effects can be obtained when applied to any other type of sewing machine.
[0017]
【The invention's effect】
As described above, according to the present invention, during normal sewing work, the amount of light emitted from the light emitting source is reduced, and the needle drop part and its surrounding area are illuminated with an illuminance with less reflected light from the fabric to be sewn. While ensuring good visibility of the progress of the sewing work, such as checking the needle drop position with little eye strain, the amount of light emitted from the light source increases when the sewing machine stops rotating and the needle drop area and its surrounding area By brightly illuminating, it is possible to easily and quickly perform fine operations such as threading operation to the needle and preparation for the next sewing.
[0018]
In addition, the illumination effect as described above can be achieved by simply rotating and stopping the sewing machine as usual without performing the troublesome work of manually adjusting the amount of emitted light.
[0019]
Further, according to the invention described in claim 2 , while preventing a broken needle or debris generated at the time of sewing work from hitting an operator's eyes or face, the needle drop point due to the presence of a safety guard therefor is prevented. A reduction in visibility is suppressed by illumination, and the progress of the sewing work can be clearly visually recognized regardless of the presence of the safety guard.
[Brief description of the drawings]
FIG. 1 is a perspective view of a cylinder type sewing machine with a lighting device according to the present invention, with a part thereof omitted.
FIG. 2 is an enlarged perspective view of a main part of FIG.
FIG. 3 is a left side view of FIG. 2;
FIG. 4 is a block diagram illustrating a configuration of a light projection amount adjustment device in a cylinder type sewing machine with an illumination device.
[Explanation of symbols]
1 Sewing Arm 8 Needle Dropping Part 9 Safety Guard 11 LED (Light Emitting Source Using Semiconductor)
13 switches
14A , 14B variable resistor
15A, 15B Manual volume
16 Rotation sensor 17 selector switch

Claims (2)

A light emitting source using a semiconductor element that projects and illuminates locally around the needle drop part is attached to the upper part of the needle drop part , and a sewing machine is connected to the connection circuit between the light source and the power source. In a sewing machine with a lighting device in which a switch that is automatically turned on in conjunction with the operation of
In the connection circuit between the light source and the power source, in addition to the switch, the first and second variable resistors whose resistance value adjustment ranges are different from each other, and the light source during normal sewing work in which the sewing machine is rotated. The amount of light emitted from the light source decreases and the amount of light emitted from the light source increases when the sewing machine stops rotating. And a changeover switch capable of automatically switching the connection between the connection state via the second variable resistor and the connection state via the first variable resistor. A sewing machine with a lighting device , wherein each of the second variable resistors is provided with a manual volume capable of setting and adjusting their resistance values in different ranges . The sewing machine-equipped sewing machine according to claim 1, wherein a plate-like safety guard made of a transparent material is provided at a position before the working position with respect to the needle drop portion.

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