JPH058254B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a unit spring heat treatment apparatus for heat treating a unit spring, which is used for a mattress or the like and is formed by forming a large number of coil springs at predetermined intervals via connecting parts.

(Prior Art) For example, in a mattress or the like, a unit spring in which a number of coil springs are continuously molded is sometimes used instead of a single coil spring. This unit spring is made by unwinding a single wire rod wound into a coil and introducing it into the forming section of the unit spring manufacturing equipment.
In this forming section, the wire rod is bent to form a large number of coil springs a... on the wire rod as shown in Fig. 1, and at the connecting portion so that the axes of these coil springs a... are parallel to each other. Connected by b... Therefore, the unit spring is continuously rolled out from the molded part, and can be used as a mattress spring by cutting it into a desired length or by intertwining adjacent coil springs with each other. In this case, unit springs are easier to assemble than individual springs, and each coil spring is less likely to be elastically deformed on its own, which has the advantage of preventing local collapse.

However, as mentioned above, unit springs obtained by simply bending wire have the disadvantage that work hardening occurs in each coil spring, reducing the strength of the spring by about 10% and easily causing distortion. . Therefore, a method of heat-treating the unit spring by placing it in an electric furnace, for example, has been considered, but when heat-treating using an electric furnace, the thermal efficiency is poor, and the process of manufacturing the unit spring using manufacturing equipment and the heat treatment process using the electric furnace are difficult. There was a problem that the process was discontinuous and work efficiency was poor. Therefore, in order to solve the above problem, the applicant has developed a unit spring as shown in Fig. 9, which allows continuous heat treatment of the unit spring formed in the forming section and improves work efficiency. The heat treatment equipment was provided in Japanese Patent Application No. 60-295740.

The apparatus shown in FIG. 9 shows a heating section 100 that heats a unit spring of the heat treatment apparatus by applying electricity, and an air cylinder 101 is actuated to release a lever 102.
rotates counterclockwise around pin 103,
The current-carrying electrode 104 rotates in the same direction. Further, the rotating piece 106 rotates clockwise about the pin 107 via the lever 102 and the link 105, and the presser electrode 108 rotates in the same direction. In this way, the current-carrying electrode 104 and the holding electrode 108 rotate in the clamping direction, and the connecting portion b of the unit spring 109 is held while being supported by the support portion 110 provided above the current-carrying electrode 104. Then, the current-carrying electrode 104 and the unit spring 109 become electrically energized.
By energizing the current-carrying electrode 104, a predetermined current flows through the unit spring 109, and the unit spring 1
09 is continuously heat-treated while being transported along the transport path.
Therefore, by bending the wire rod, the work hardening generated in each coil spring a is removed, and the strength of the coil spring a is increased.

(Problems to be Solved by the Invention) However, in the heat treatment apparatus having the above configuration,
The heating section 100 of this device has a structure in which both the current-carrying electrode 104 and the holding electrode 108 are rotated, so there is a problem that the number of parts is large, the structure becomes complicated, and the cost increases. Also, as shown in Figure 7, if the unit spring is molded in the molding part without any abnormality, there is no problem, but depending on various conditions such as the condition of the molding part and the hardness of the wire, as shown in Figure 8. The connecting portion b of the unit spring may not be formed parallel to the direction in which the coil springs a are connected. When heat-treating such a unit spring 109 with this heat-treating apparatus, the heating section 100 is configured such that the current-carrying electrode 104 and the holding electrode 108 are connected to the pin 10, respectively.
3 and the pin 107 as a fulcrum, the joint part b of the unit spring 109 is held in place, so that the part where the joint part b of the unit spring 109 is held is above the normal position. Since the current-carrying electrode 1 is located at this location,
04 and the presser electrode 108, and the unit spring 109 cannot be reliably heat treated.

The present invention has been made based on the above circumstances, and its purpose is to provide a unit spring heat treatment device that has a simple structure and that can reliably perform heat treatment even if the unit spring is slightly deformed. There is a particular thing.

(Means and effects for solving the problem) In order to solve the above problem, the present invention transports a unit spring molded in a molding section of a unit spring manufacturing device in a direction in which coil springs are connected, and midway along this transport path, first and second stoppers that temporarily stop the unit spring being conveyed, first and second holding parts that clamp the unit spring together with these first and second stoppers, and the unit spring that is stopped. first and second heating parts are provided that contact the connecting part of the unit spring and heat the coil spring with electricity, the first heating part being located between the first stopper and the first holding part. The second heating part is located between the second stopper and the second holding part, and the distance from the first stopper to the first heating part and the distance from the second stopper to the second heating part are The heating section is connected to a presser body which is rotatably provided at a predetermined angle, and has a current-carrying electrode fixed below the presser body, and is connected to a unit spring together with the presser body. and a support part that holds the unit spring and heats the unit spring with electricity. Therefore, since the heating section of this heat treatment apparatus has a simple structure, it does not increase costs or complicate assembly work. Furthermore, even if the unit spring is deformed, the support part that supports the connection part of the unit spring is fixed, and the presser body rotates from an upper position to clamp the connection part of the unit spring located on this support part. Therefore, the connecting portion of the unit spring can be securely held. Therefore, the strength of the unit spring can be improved by reliably heating it with electricity.

(Example) An example of the present invention will be described below based on the drawings.

FIG. 1 is a schematic plan view of a heat treatment apparatus for unit springs, and 1 is a conveyance path for conveying the unit springs. This conveyance path 1 is constituted by the top plate 3 of the heat treatment apparatus main body 2, and one end thereof is connected to the forming section 4 of the unit spring manufacturing apparatus, and the other end thereof is connected to the next step 5. This conveyance path 1 is designed to convey the unit springs in a direction in which each coil spring a is connected, and a guide body 6 for guiding the unit springs is provided in the middle of this conveyance path 1. . This guide body 6 has side plates 7, 7 installed at an interval slightly wider than the length of the coil spring a.
and an upper plate 8 installed between these side plates 7, 7 at a height slightly higher than the diameter of the coil spring a, forming a tunnel-like structure. The entrance side of this guide body 6 is formed as guide surfaces 9, 9 by bending side plates 7, 7 outward, and an insulator 10 is attached to the upper inner surface of this guide body 6. There is. Furthermore, the top plate 3 located outside the one side plate 7 is provided with a first stopper 11 and a second stopper 12. Said, first,
The second stoppers 11, 12 are air cylinders 13,
14 so as to be projectable and retractable, and when projecting, the unit spring projects into the guide body 6 from the notch 15 provided in the side plates 7, 7 and temporarily stops the unit spring conveying the inside. ing. That is, the first and second stoppers 11 and 12 are inserted into the openings c and c between the connecting parts b and b formed alternately on the left and right sides of the unit spring, and come into contact with the end of the coil spring a. It's becoming like that. Furthermore, first and second stoppers 1 are provided on the top plate 3 on the side where the first and second stoppers 11 and 12 are provided, respectively.
First and second holding parts 16 and 17 are installed at intervals corresponding to the length of the connecting part b of the unit spring from 1 and 12. These first and second presser parts 16,1
7 is attached to the lower surface of the top plate 3, inserts the top plate 3 through a rotating cylinder 19 that rotates 90 degrees, and further inserts the top plate 3
One end of the shaft 20 is inserted into the shaft 20 and guided upward through a bearing fitting 18 attached to the upper surface of the shaft 20 .
Therefore, when the rotary cylinder 19 is rotated approximately 90 degrees, the first and second presser portions 1
6 and 17 are rotated 90 degrees and remain stationary while protruding into the guide body 6. Further, the main body 2 facing both sides 7, 7 of the guide body 6 is provided with first, second and third coil springs a for energizing and heating.
Heating sections 21, 22, and 23 are provided. The first heating section 21 is connected to the first stopper 11 and the first heating section 21.
It is installed at a position slightly closer to the first stopper 11 between the pressing parts 16 of the second heating part 22
is installed between the second stopper 12 and the second presser section 17 at a position closer to the second presser section 17 side. That is, the first stopper 11 and the first heating section 2
1 and the distance between the second stopper 12 and the second heating section 22 are different. The first, second, and third heating parts 21, 22, and 23 have the same structure, but the third heating part 23 installed on one side plate 7 is connected to the negative side of the power source (not shown). , the first and second heating parts 21 and 22 are electrically connected to the positive side.

FIG. 2, FIG. 3, and FIG. 4 show the configurations of the first, second, and third heating sections 21, 22, and 23. Among these, the first heating section 21 will be described as a representative example. The first heating section 21 has a protrusion 24 formed at the front lower part thereof, and a pair of side plates 25 having a substantially L-shape, and is located halfway at the rear of the pair of side plates 25 and connects the pair of side plates 25. A rear plate 26;
At the lower end of the pair of side plates 25, the side plates 25
A main body 28 formed of a lower plate 27 connecting the
A rotating cylinder 29 that rotates 90 degrees is attached to the outer surface of the one side plate 25, and the rotating cylinder 29 is inserted between the pair of side plates 25 by passing through this side plate 25.
a shaft 30 derived from the shaft 30; a base fitted onto the shaft 30; a presser body extending from the base, formed into a bow shape from the middle toward the distal end, and made of an insulator such as ceramics or Bakelite; 31 and
A spacer 32 which is between the presser body 31 and the side plate 25 and through which the shaft 30 is inserted;
A stopper 33 that prevents the object from slipping out is attached along the protrusion 24 between the protrusion 24 of the pair of side plates 25, and has a substantially L-shape on both sides of the rectangular central part 34. A pair of external parts 35 are formed;
A supporting portion 36 made of an insulator such as ceramics or Bakelite, and the upper end of the supporting portion 36 protruding slightly from the upper corner of the central portion 34,
A receiver 3 made of an insulator is attached to the center of a substantially L-shaped receiver plate 37, which is inserted diagonally downward through the inside of the main body 28 and whose midway portion is attached below the main body 28.
8 and a current-carrying electrode 39 whose other end is connected to a power source. The first heating section 21 is located within the hole 40 provided in the top plate 3, and between the upper surface of the protrusion 24 formed on the main body 28 of the first heating section 21 and the outside 35 of the support section 36. The top surface of one end side is located on the same plane as the top surface of the top plate 3, and the top surface of the center part 34 of the support part 36 and the top end of the current-carrying electrode 39 are located on the same plane as the top surface of the top plate 3 and the top surface of the protrusion 24. Located slightly above the top surface. The first heating section 21 has an L-shaped cross section and a first connector 41 having a predetermined length, with one side connected to the rear plate 26 of the main body 28 and the other side connected to the top plate 3. One side of the connector 43, which is fixed with a screw 42 and formed with a step higher than the middle part in the length direction, is fixed to the front lower surface of the main body 28, and the other side is screwed to the lower surface of the top plate 3. 44 to fix the first heating section 21 to the top plate 3. Further, the front end of the first heating part 21 is located inside the guide body 6 through the notch 15 formed in the side plate 7 of the guide body 6, and the connecting part b of the unit spring is connected to the main body 28. The connecting portion b is supported on the upper surface of the protruding portion 24 and the front upper surface of the supporting portion 36, and this connecting portion b is connected to the supporting portion 3.
The upper end of the current-carrying electrode 39 located at the upper end of the electrode 6 is brought into contact with the upper end of the current-carrying electrode 39 . Then, the first and second stoppers 11 and 12 come into contact with the ends of the coil springs a of the unit springs conveyed within the guide body 6 to temporarily stop the unit springs. Presser part 1
6 and 17 are rotated 90 degrees, and the first and second stoppers 11 and 12 abut against the end of the coil spring a located on the rear side with the connecting portion b sandwiched between the abutted coil spring a and the abutted coil spring a. to connect the unit spring to the first and second springs.
When it is clamped together with the stoppers 11 and 12, the connecting part b of the unit spring is supported by the support part 36, and the presser body 31 is rotated 90 degrees and clamped by the support part 36,
The coil spring a is energized.

Next, the operation of the unit spring heat treatment apparatus constructed as described above will be explained.

The unit spring molded in the molding section 4 is transferred to the conveyance path 1.
is transported and guided to the guide body 6. At this time, the first and second stoppers 11 and 12 are in the retracted state, the first and second presser parts 16 and 17 are at positions outside the side plate 7 facing the molding part 4, and the presser body 31 is in the upper position. When the unit spring is in the position facing , the unit spring passes through the guide body 6, but the first and second stoppers 1 are
1 and 12 protrude by actuation of air cylinders 13 and 14. Therefore, the ends of the coil springs a, a contact the first and second stoppers 11, 12 and are temporarily stopped. At the same time, the rotating cylinder 19,
19 is rotated 90 degrees to form the first and second presser parts 16,1.
Rotate 7 90 degrees. These first and second presser parts 1
6 and 17 abut against the ends of the coil springs a and a, and together with the first and second stoppers 11 and 12, they sandwich the connecting portion b of the unit spring. When the first and second presser parts 16 and 17 finish rotating 90 degrees, the first and second presser parts 16 and 17
The rotary cylinders 29 of the second and third heating units 21, 22, 23 are activated and the presser body 31 is oriented upward.
rotates 90 degrees clockwise. Then, the connecting portion b of the unit spring located on the support portion 36 is held between the presser body 31 and the support portion 36. At this time, the connecting portion b is in contact with the current-carrying electrode 39, and the current-carrying electrode 39 and the unit spring are electrically energized.If the current-carrying electrode 39 is connected to a power source and a current is caused to flow through a changeover switch (not shown). , a current flows through the unit spring, and the unit spring is heat treated. In this case, one end side of the coil spring a is turned to the negative side by the third heating section 23, and the other end side is turned to the negative side by the third heating section 23, and the other end side is
Since it is connected to the positive side by the second heating parts 21 and 22, current flows through the shortest distance between the connecting parts b at both ends, so that the first coil spring a...
Nouchi and Ro are heated by electricity. The energization time at this time is approximately 0.3 seconds, and the coil springs a and a are approximately
It is heated to around 300 degrees Celsius. In this way, when the coil spring a is instantaneously energized and heated, the first and second stoppers 11 and 12 are moved to the air cylinder 1.
3 and 14, and the first and second holding parts 16 and 17 return to their original positions when the rotary cylinder 19 rotates 90 degrees in the opposite direction, and the first, second and third heating parts are retracted. Rotating cylinder 19 of parts 21, 22, 23
is operated at the same time to rotate the presser foot 31 and return it to its original position facing upward. Therefore, the unit spring is conveyed along the conveyance path 1 and moves one pitch, and then when the coil spring a reaches the predetermined position, the first,
The second stoppers 11 and 12 protrude to temporarily stop the unit spring, and the first and second stoppers
The holding parts 16 and 17 rotate 90 degrees to hold the unit spring together with the first and second stoppers 11 and 12, and the first, second and third heating parts 21, 22, 23
operates and heats the coil spring a by energizing it. By repeating this operation, the unit spring molded in the molding section 4 is continuously heat-treated while being transported along the transport path 1. Therefore, since the work hardening that occurs in each coil spring a is removed by bending the wire, the strength of these coil springs a can be increased. Furthermore, in order to heat the unit spring by applying electricity in the first, second, and third heating parts 21, 22, and 23, the connection part b of the unit spring has a current-carrying electrode 39, and the connecting part b of the unit spring has a current-carrying electrode 39, and a The arch-shaped presser body 31 located above the support part 36 is rotated downward from the upper position so that the connecting part b is pressed from above and held between the support part 36. Therefore, even if the unit spring is deformed and the connecting part b is not located on the support part 36, the connecting part b will be pushed downward so as to be wrapped around the bow-shaped presser body 31 and will not come off from the presser body 31. Connecting part b
can be pressed from above. The heating section 100 shown in FIG.
08 are rotated in the left-right direction to clamp the connecting part of the unit spring, so there was a problem that it was not possible to securely clamp the connecting part b. However, in the present invention, the connecting part b Electrical heating can be performed by bringing a current-carrying electrode 39 into contact with the current-carrying electrode 39 .

Furthermore, the first, second and third heating parts 21, 2
2 and 23 have a simple structure in which a rotary cylinder 29, a presser body 31 connected to the rotary cylinder 29, and a support portion 36 having a current-carrying electrode 39 are fixed to the main body 28, and since the number of parts is small, assembly is easy. This can be done easily and does not increase costs. Moreover, even if the heating parts 21, 22, 23 are out of order, each heating part 21, 22, 23 can be connected to the top plate 3.
It can be easily removed and repaired. Furthermore, since the distance between the first stopper 11 and the first heating section 21 and the distance between the second stopper 12 and the second heating section 22 are different, the portion held between the first heating section 21 and the second heating section 21 is different from each other. Even if the pitch is moved, the second heating section 2
2 will not be pinched. Therefore, unlike in the past, the pinched portions of the unit springs are not subjected to excessive heat treatment, and there is no reduction in strength. In the above embodiment, the first and second heating parts 21 on the positive side are provided on one side of the guide body 6.
22, and the third heating section 23 on the minus side is arranged on the other side, but the arrangement of the heating section is not limited to the above embodiment. For example, the first heating section 23 in FIG. 21 on the plus side, the second heating section 22 on the minus side, and removing the third heating section 23, the current applied to the first heating section 21 will flow from the first heating section 21 to this one. A coil spring a that passes through a connecting part b held between the first heating part 21 and is further connected to this connecting part b, a connecting part b that is connected to this coil spring a, a coil spring a that is connected to this connecting part b, and It flows to the second heating section 22 on the minus side through the connecting section b connected to the coil spring a and held between the second heating sections 22 . Therefore, a loop current flows through the part of the unit spring sandwiched between the first heating part 21 and the second heating part 22, and that part is heated. Therefore, the third heating section 23 is not necessarily required, and the first heating section 21 is set to the positive side and the second heating section 22 is set to the positive side.
A similar effect can be obtained by setting the value to the negative side. The presence of the third heating section 23 allows efficient and reliable heat treatment.

(Effects of the Invention) As described above, the present invention conveys the unit spring formed in the forming section, and temporarily stabilizes the unit spring being conveyed in the middle of the conveyance path with the stopper and the holding section. In a heat treatment device for a unit spring, the coil spring of the unit spring is electrically heated by stopping the unit spring, bringing the coupling part of the unit spring into contact with the heating part, and heating the coil spring of the unit spring. and a support part fixed below the unit spring, supporting the connecting part of the unit spring, and having a current-carrying electrode,
The presser body is rotated downward from the upper position to press the connecting portion of the unit spring downward, the connecting portion of the unit spring is held between the presser body and the support portion, and the connecting portion is energized. in contact with the electrode,
The coil spring is heated by electricity. Therefore,
The unit spring being transported can be continuously heat-treated, work hardening occurring in the unit spring can be removed, and a unit spring with increased strength without distortion can be provided. Furthermore, since the heating section has a simple structure with a small number of parts, it can be easily assembled without causing an increase in cost. Furthermore, even if the unit spring formed in the molding section is deformed for some reason, the connection section of the unit spring can be reliably held between the presser body and the support section, and it can be heated with electricity. Play advantage.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention,
Fig. 1 is a schematic plan view of the heat treatment apparatus, Fig. 2 is an enlarged sectional view taken along the - line in Fig. 1, Fig. 3 is a plan view of Fig. 2, and Fig. 4 is a perspective view of the heating section. , FIG. 5 is an enlarged sectional view taken along the - line in FIG. 1, FIG. 6 is an enlarged sectional view taken along the - line in FIG. 1, FIG. 7 is a perspective view of the unit spring, and FIG. FIG. 9 is a plan view of a deformed unit spring, and FIG. 9 is a sectional view showing a conventional heating section. Symbols 1... Conveyance path, 4... Molding section, 11... First stopper, 12... Second stopper, 16... First holding part, 17... Second holding part, 21... First heating part, 22 ...second heating section, 23...third heating section,
31... Presser body, 36... Support part, 39... Current-carrying electrode,
a...Coil spring, b...Connection part.

Claims (1)

[Claims] 1. In a unit spring heat treatment apparatus for heat treating a unit spring in which a large number of coil springs are formed on one wire at predetermined intervals via connecting parts, a conveyance path for conveying the unit spring in a direction in which the coil springs are connected; , first and second stoppers that are provided in the middle of the conveyance path and that temporarily stop the unit spring by coming into contact with the ends of the coil springs that are being conveyed, and are paired with the first and second stoppers. A first abutting end of the coil spring located on the rear side with the coupling portion sandwiched between the coil spring abutting the first and second stoppers and sandwiching the unit spring together with the first and second stoppers. , and the second holding part are also provided in the middle of the conveyance path, and the unit spring is connected to the first,
first and second heating parts each having a current-carrying electrode that contacts the connecting part of the unit spring and heats the coil spring when the spring is temporarily stopped by the second stopper and the first and second holding parts; The first heating part is located between the first stopper and the first holding part, the second heating part is located between the second stopper and the second holding part, and the first heating part is located between the second stopper and the second holding part. The distance from the first stopper to the first heating section is made different from the distance from the second stopper to the second heating section, and each heating section is provided with a presser body rotatably provided at a predetermined angle. , is fixed below the presser body, supports the connecting portion of the unit spring which is temporarily stopped by the stopper and the presser portion, clamps the connecting portion of the unit spring together with the presser body, and heats the unit spring by energizing it. 1. A heat treatment apparatus for a unit spring, comprising a support part having a current-carrying electrode.