JP6830188B2 - Telescopic cover damper - Google Patents

Description

It relates to a telescopic cover used for the purpose of protecting a sliding surface and a ball screw from chips and cutting agents of a machine tool.

The telescopic cover (hereinafter abbreviated as telescopic) follows the drive of the shaft of the machine tool, repeats the expansion and contraction movement with multiple covers overlapping each other, and removes sliding surfaces and ball screws from chips and cutting agents. It is a cover that serves to protect. In recent years, in order to improve the productivity of machine tools, the speed of machine tools has been increasing, and the telesco that follows the drive of the machine tool also expands and contracts at high speed, but if it expands and contracts at high speed, the impact at the time of stopping becomes large. At the end of the stroke, especially at the end on the contraction side, there is a problem that the noise and vibration generated at the time of collision become large. Conventionally, a rubber elastic body made of NBR or the like has been used as a stopper (hereinafter abbreviated as a rubber stopper) at the end of the contraction side of the telescopic expansion and contraction motion in order to alleviate the impact at the time of a collision. On the other hand, the conventional rubber stopper cannot sufficiently absorb the impact, the collision energy generated at the time of contraction is not sufficiently absorbed, and the generated vibration and noise are major problems. Not only is it unfavorable in terms of the working environment, but the generation of loud noise and vibration from the rubber may adversely affect the accuracy and quality of the machine tool processed products. In addition, there is a problem that the life of the telescoping itself is impaired, an abnormal noise is generated from the machine tool main body side during processing, or the telescoping is damaged, and it becomes difficult to determine the cause. Therefore, for example, Patent Document 1 and Patent Document 2 have been proposed, and both Document 1 and Document 2 have the same problem to be solved.

JP 2013-202780 Jitsuto 3056711

As a method of alleviating vibration and noise and absorbing shock, a method using a pantograph is also adopted, which is an effective means for vibration and noise. However, due to the size of the pantograph itself, there is often not enough space to install it, and it is often not possible to install it by design. In addition, pantographs are often not used due to cost issues such as the cost of the pantograph itself and the assembly of the pantograph. The present invention relates to a telescopic machine tool when a pantograph is not used, and aims to reduce noise and vibration by using a stopper instead of a conventional rubber stopper.

Further, with respect to the stroke of the machine, the shrinkage allowance of the telescopic influences the size of the machine and the installation space, and if the shrinkage allowance can be increased, the effect is great.

Conventionally, telescoping that does not use a pantograph often uses a rubber stopper, but the conventional rubber stopper does not have sufficient damping performance against impact as a stopper on the contraction side, and noise and vibration cannot be sufficiently reduced, so factory work In addition to being unfavorable in terms of the environment, there are problems that the machine body is affected by vibration and the life of the telescopic machine and the machine body is shortened. An object of the present invention is to propose a method capable of absorbing the impact of stopping due to a collision at the stroke end on the contraction side and reducing noise and vibration. In addition, telescoping has the concept of parts that are attached to the machine body, and there are many design restrictions on stroke and space. Therefore, the size of the stopper in the stroke direction is important and cannot be increased unnecessarily. Therefore, as small a part as possible can absorb energy at the time of collision, effectively reduce noise and vibration, and fit in a limited space. Finding an efficient stopper is a challenge to be solved.

The present invention has been made to solve the above problems, and the first invention is to reduce vibration and noise by using a compression coil spring as a damper instead of a conventional rubber stopper as a telescopic stopper. is there. There are cylindrical coil springs, conical base coil springs, via barrel-shaped coil springs, drum-shaped coil springs, etc. as compression coil springs, and it is a known fact that compression coil springs have a damper effect and can reduce vibration and noise. However, the present inventors do not know an example in which it is used as an easily removable stopper on the contraction side of the telesco. The present invention makes it possible to easily attach and detach a compression coil spring to a telesco with a screw, to effectively absorb energy at the time of a collision at low cost, and to use it as a damper for the telesco.

To make it easily removable with a screw, extend the end of the coil at the bottom of the compression coil spring, bend the extended coil inside the bottom circle formed by the compression coil spring, and at the same height as the bottom of the compression coil spring. A substantially circular screw fastening seat was provided integrally with the compression coil spring. In addition, the inner diameter of the fastening seat is a substantially circular shape that allows the shaft of the screw to pass through but not the head of the screw, and is erected by tightening the screw so that the shoulder of the screw presses the substantially circular portion of the screw fastening seat. It can be fastened to a plate or mounting plate and can be easily attached and detached. The inner diameter of the compression coil spring other than the screw fastening seat has a diameter through which the screw used for fastening can pass, and the upper surface of the compression coil spring opposite to the bottom on which the fastening seat is formed is shrunk by telesco. It is the collision surface that hits the stand plate of the next cover, and is the surface that receives the energy of the collision. The compression coil springs are characterized in that noise and vibration are reduced by using at least two or more compression coil springs for one cover.

In the second invention, as in the first invention, the compression coil spring is provided with a substantially circular fastening seat that can be easily fastened by a screw, and several steps near the bottom including the bottom or the entire spring is directed toward the bottom. It is characterized by having a compression coil spring with a quadratic curve that gradually widens like the foot of Mt. Fuji. By making the quadratic curve skirt, when the telesco contracts and the compression coil spring contracts, part or all of the small diameter upper coil will be sequentially subducted into the large diameter bottom coil. .. By making it sink in sequence, not only noise and vibration are reduced, but also the compression height of the compression coil spring when the telesco is contracted is reduced, and the telesco can be made smaller, which saves space.

By extending the coil end at the bottom of the compression coil spring and providing a substantially circular fastening seat integrated with the spring, it can be easily attached and detached with screws, and when contracted compared to the rubber stopper used in conventional telesco. It has an extremely excellent ability to absorb the impact caused by the collision, and can significantly reduce noise and vibration. That is, the damping effect is large, and the stopper with a large damper effect can be used. In addition, since it has a larger shrinkage rate than rubber stoppers, it has an advantage in terms of stroke, and it is not inferior to conventional rubber stoppers in terms of cost, and it is easy to obtain and attach / detach. Therefore, it has become possible to provide dampers that can be driven at high speeds.

Furthermore, by using a compression coil spring that has a quadratic curved spread that gradually spreads toward the bottom like the foot of Mt. Fuji, stability is increased during contraction, the contraction allowance can be increased, and the stroke is superior and space is saved. It has become possible to provide dampers that can respond to the change and expand the range of designs.

に左右に移動し、左テレスコ２と右テレスコ３は、工作機械のテーブル１の駆動に従動して伸縮する。図１と図２はテーブル１が右方向に移動した状態で、左テレスコ２は伸びた状態、右テレスコ３は縮んだ状態を示している。以下、図２、図３の左テレスコ２により構成を説明する。第一のカバー４は、テーブル１にネジ８により固定するための取付板７を構成部材として備えており、テーブル１の移動により従動するが伸縮しない固定カバーである。また、第三のカバー６も固定されていて伸縮しない固定カバーである。第１のカバー４と第二のカバー５および第三のカバー６の幅方向の寸法Ｗ１、Ｗ２Ｗ３を比較すると、Ｗ１＞Ｗ２＞Ｗ３の関係に有り、幅方向以外の他の部分も同様の関係となっていて、テーブル１が左方向に駆動しテレスコ２が縮む方向に動くと、第一のカバー４に第二のカバー５が潜り込み、第二のカバー５に第三のカバー６が潜り込むようになるので、テーブル１の左右への移動に伴い伸縮できる構造となっている。First, the configuration, operation, problems, and the like of the conventional telesco will be outlined with reference to FIGS. 1 to 4. FIG. 1 is a schematic view showing an example of a conventional telescoping, is a projection drawing of a telescoping used for the X-axis of a small vertical machine tool by a three-dimensional CAD, and FIG. 2 is a sectional view taken along the line AA of FIG. Yes, FIG. 3 is a sectional view taken along line BB of FIG. In FIG. 1, the table 1 has the left telesco 2

The left telescopic 2 and the right telescopic 3 move to the left and right, and expand and contract according to the drive of the table 1 of the machine tool. 1 and 2 show a state in which the table 1 is moved to the right, a state in which the left telesco 2 is extended, and a state in which the right telesco 3 is contracted. Hereinafter, the configuration will be described with reference to the left telesco 2 of FIGS. 2 and 3. The first cover 4 is provided with a mounting plate 7 for fixing to the table 1 with screws 8 as a constituent member, and is a fixed cover that is driven by the movement of the table 1 but does not expand or contract. Further, the third cover 6 is also a fixed cover that is fixed and does not expand or contract. Comparing the dimensions W1 and W2W3 in the width direction of the first cover 4, the second cover 5, and the third cover 6, there is a relationship of W1>W2> W3, and the other parts other than the width direction have the same relationship. When the table 1 is driven to the left and the telesco 2 moves in the contracting direction, the second cover 5 slips into the first cover 4 and the third cover 6 slips into the second cover 5. Therefore, it has a structure that can be expanded and contracted as the table 1 moves to the left and right.

The second cover 5 and the third cover 6 are composed of a standing plate 9 and a standing plate 10, respectively, to which a rubber stopper 11 and a rubber stopper 12 are attached, respectively. FIG. 4 is a view in which the approximate dimensions of the rubber stopper 11 used for comparison with the embodiment of the present invention described later are entered, and the groove 13 is a grommet type for fitting into the mounting plate 7 and the vertical plates 9 and 10. It is a groove of. When the table 1 moves to the left and reaches near the end of the stroke, the U surface of the rubber stopper 11 attached to the standing plate 9 of the cover 5 collides with the V surface of the mounting plate 7 and hits the standing plate 10 of the cover 6. The S surface of the attached rubber stopper 12 collides with the T surface of the rubber stopper 11 of the cover 5, the contraction stroke of the left telesco 2 is completed, and when the table 1 moves to the right, the left telesco 2 extends. It becomes. The rubber stopper 11 and the rubber stopper 12 used in the conventional telesco are made of a rubber elastic body such as NBR, and are intended to alleviate the impact due to a collision at the time of contraction, and are rubber for making a predetermined stroke. Although it is a stopper, it has a problem that it has a low function of sufficiently absorbing noise and vibration generated at the time of a collision near the end on the contraction side, and the noise and vibration are large. The present invention is intended to solve the problem.

The mounting plate 7 is a constituent member of a cover having a role of mounting on a machine body or a table 1 (not shown), and the standing plate 9 and the standing plate 10 are constituent members of the cover 5 and the cover 6, but are rubber stoppers. The 11 and the rubber stopper 12 may be attached to the standing plate 9 and the standing plate 10, or may be attached to the mounting plate 7 and the standing plate 9 or the standing plate 10. Further, FIG. 14 of FIG. 2 is a wiper for eliminating the accumulation of cutting agents such as chips generated by cutting and cutting oil used at the time of cutting on the cover 2. In order to explain the present invention. Since it is not necessary, the description is omitted. Further, although a member such as a guide (not shown) on which the telescopic slides or rolls on the guide surface of the machine tool is actually used as a constituent member, the drawings and the description thereof will be omitted. Since the right telesco 3 is almost the same as the left telesco 2 due to its own difference, the description thereof will be omitted, but if one moves to the contraction side, the other moves to the extension side.

Next, the first invention will be described with reference to FIGS. 5 to 10 according to the first embodiment. FIG. 5 is a diagram illustrating an outline of the first embodiment, is a projection drawing of a telesco drawn by a three-dimensional CAD as in the conventional example of FIG. 1, and FIG. 6 is a sectional view taken along the line CC of FIG. 7 is a partially enlarged view of the Y portion of FIG. 6, which is a detailed view showing a state in which the cylindrical coil spring 15 is fastened to the standing plate 9 with screws 16. 8 is a diagram showing the cylindrical coil spring 15 used in the first embodiment, FIG. 9 is a schematic view showing the cylindrical coil spring and the screw 16, FIG. 10 is a right side view of FIG. 9, and the cylindrical coil spring 15 is on the bottom side. It is a figure which shows the fastening seat 17 seen from. The telescoping of FIGS. 5 to 6 described in the first embodiment is different from the conventional telescoping described in FIGS. 1 to 3 in that a cylindrical coil spring is used as a damper 15 for the NBR stopper 11 and the stopper 12. Since the other members do not change, the codes of the members that do not change are the same. In addition, since the operation is the same as that of the conventional telescopic, the description thereof will be omitted. Hereinafter, the coil portion forming the upper surface of the upper and lower surfaces of the compression coil spring is used as the top portion, the coil portion forming the bottom surface is used as the bottom portion, and the bottom surface is a surface to be fastened to the mounting plate 7, the standing plate 9 and the standing plate 10 by screws 16. The upper surface of the opposite surface is described as the surface on which another shrinking cover collides.

In the present invention, as shown in FIGS. 8 and 10, the coil end of the bottom of the compression coil spring 15 is extended, the extended coil is bent inward, and a substantially circular fastening seat 17 is coiled in the same phase as the bottom. By providing it integrally with the spring and processing a female screw in advance on the standing plate 9, the standing plate 10, or the mounting plate 7, the screw 16 is provided via the fastening seat 17 as shown in FIGS. 6, 7, and 9. The fastening seat 17 is characterized in that it can be easily attached to and detached from the mounting plate 7, the standing plate 9, and the standing plate 10 and used as a damper at the time of contraction to attenuate the impact and vibration generated at the time of contraction. Has a substantially circular inner diameter through which the shaft portion of the screw 16 can pass and cannot pass through the head, and can be fastened by pressing the coil of the fastening seat 17 with the head of the screw 16. The inner diameter is a diameter through which the screw 16 can pass and the screw 16 can be fastened to the vertical plate 9, the vertical plate 10 or the mounting plate 7 using a tightening tool, and is used when the compression coil spring is provided with a fastening seat. The length of the head of the screw is shorter than the height of the compression coil spring when it is in close contact.

In the first embodiment, instead of the conventional rubber stopper 11 and the rubber stopper 12 described with reference to FIGS. 1 to 4, the cylindrical coil spring in which the fastening seat 17 is provided on the cylindrical coil spring is contracted by telesco. It was used as the damper 15 on the side. A cylindrical coil spring 15 provided with such a fastening seat 17 was attached to the standing plate 9 and the standing plate 10 as shown in FIG. 6, and a verification test was conducted to verify the effect of reducing noise and vibration. The vibration measurement results are shown in Table 1.

Next, the second embodiment will be described with reference to FIG. FIG. 11 is a projection drawing of a truncated cone-shaped (hereinafter abbreviated as conical coil spring) compression coil spring used in the second embodiment by three-dimensional CAD. In the second embodiment, instead of the cylindrical coil spring 15 described in the first embodiment, the conical coil spring of the present invention is attached to each telesco as a damper 15a in the same manner as in FIG. Like the cylindrical coil spring 15 described in the first embodiment, the conical coil spring 15a has the same end as the bottom coil by extending the end of the coil at the bottom so that it can be attached to the stand plate or the mounting plate with screws. A substantially circular fastening seat 17 is integrally provided on the phase, and as in the first embodiment, a verification test described later was performed to measure noise. The measurement results are shown in Table 1.

Next, the test method, test conditions, and the like of the verification test conducted to verify the effect of the present invention will be described. In the verification test, the X-axis telesco of the vertical machine tool described with reference to FIGS. 1 to 5 was actually manufactured, and the rubber stopper 11 and the rubber stopper 12 shown in FIG. 4 were covered on the manufactured telesco with the standing plate 9 of the cover 5. When three of the cylindrical coil springs 15 of the present invention described in the first embodiment and shown in FIG. 9 are attached to the standing plate 9 and the standing plate 10 of the cover 6 respectively. Further, in the case where three conical coil springs described in the second embodiment and shown in FIG. 11 are attached to the standing plate 9 and the standing plate 10, respectively, using a testing machine capable of continuously and automatically reciprocating, under the test conditions described later. A continuous reciprocating test was performed, and the noise generated at the end of the contraction side was measured using a sound level meter.

As shown in Table 1, the maximum value of noise for 3 days when the conventional NBR rubber stopper 11 and rubber stopper 12 are used is 85.7 (dB), whereas the cylindrical coil spring of the present invention is used as a damper. The maximum value when used as 15 was 69.4 (dB), and the average of the maximum values when the conical coil spring 15a shown in FIG. 11 was used as a damper was 69.7 (dB). From the results, the difference in noise between the compression coil spring and the conventional rubber stopper is about 16 (dB), which makes it clear that there is an extremely large difference, which can be industrially acceptable and has a fastening seat. It was confirmed that even the compression coil spring has a great effect as a damper. In addition, although there is no specific number for vibration, it was proved by verification tests that the vibration was clearly smaller and the damping performance was higher. There was almost no difference in noise between the cylindrical coil spring 15 and the conical coil spring 15a, which was within the error range. The rationale for no difference is unclear, but it has been proven to be effective as a damper with no difference between linear and non-linear, extending the coil termination and providing a substantially circular fastening seat integrated with the compression coil spring. It has been proved that it is possible to provide a damper that can be easily attached and detached.

Table 1 shows the noise measurement results from the verification experiment.

Next, the test conditions for the verification test are shown.
(1) Telesco used in the test
Total weight of Telesco: 3.5 (kg)
Cover plate thickness: 1.6 (mm), cover material: SPHC
Thickness of mounting plate and standing plate: 2.3 (mm), Material: SPHC
(2) Test conditions
Movement speed: 60 (m / min.)
Acceleration: 1G
Stroke: 400 (mm)
(3) Common specifications of the coils used in the first and second embodiments
Material: SWP-B
Wire diameter: φ1.6 (mm)
Outer diameter of bottom: φ20
Bottom shape: There is a substantially circular fastening part with screws
Inner diameter of fastening part (inner diameter of substantially circular part for screw fastening): φ4.5
(4) Cylindrical coil spring used in the first embodiment: FIGS. 5 to 11
Number of turns: 4.5 (effective number of turns: 2.5)
Inner diameter of top: φ16.8
Free length: 17.3 (mm)
Effective height when a load is 5 (kg): 10 (mm)
Adhesion height: 8 (mm)
Spring constant: Approximately 6.8
(3) Conical coil spring used in the second embodiment: FIG. 12
Number of turns: 5 (effective number of turns: 3)
Inner diameter of top: φ11.6
Outer diameter of bottom: φ20
Free length: 20 (mm)
Adhesion height: 9.17 (mm)
(4) Conventional NBR stopper used for comparison
8 and dimensions are also shown in FIG.
Hardness: Hs: 50
(5) Noise measuring equipment
Manufacturer: Ono Sokki
Sound level meter model: LA-220
Measurement: Measured 1 (m) away from the sound source.
(6) Measurement date and number of times
Measurement date: 3 days
Number of times: 10 times a day (7) Number of continuous reciprocating operation of the telesco using the cylindrical coil spring of Example 1
Number of times: 600 (10,000)

Note that the above test condition (7) is a cone of the present invention because, in addition to reducing noise and vibration as a damper, there is a request from a machine tool manufacturer to withstand 500 (10,000 times) continuous reciprocating motions. The truncated cone spring was subjected to continuous reciprocating operation of 600 (10,000 times), which is slightly more than 5.5 million times. As a result, even a compressed L coil spring equipped with a fastening seat can be operated without any problem in terms of life, and the durability is verified, and the noise immediately after the start of the test and before the end of 600 (10,000 times) is also measured and there is no change. It was confirmed. Although it is not an absolute condition, if the upper and lower surfaces of the compression coil spring are ground, the upper and lower surfaces may be ground because they are stable and effective in extending the life.

As described above, the fastening seat 17 can be integrally manufactured with the fastening seat 17 and the compression coil spring by extending the end portion of the coil of the cylindrical coil spring 15, and the fastening seat 17 is provided with a screw. It became possible to screw it with, and it became easy to put on and take off. Further, providing the fastening seat 17 does not hinder the damper performance, which is the focus of the present invention, and its effect is great.

Subsequently, the second invention will be described as a third embodiment with reference to FIGS. 12 to 16. The second invention is a compression coil spring provided with a substantially circular fastening seat that can be easily attached and detached with the screw of the first invention, and several stages of coils or coil springs near the bottom including the bottom provided with the fastening seat. It is characterized by using a compression coil spring formed in a quadratic curved shape that gradually spreads toward the bottom like the foot of Mt. Fuji as a damper for telesco. In FIG. 12B, several stages of the coil near the bottom of the cylindrical coil spring are gradually expanded in a quadratic curve like the foot of Mt. Fuji, and the range of the Z portion of several stages of the coil near the top is It is shown that several steps below the Z portion of the cylinder are gradually expanded in a quadratic curve, and FIG. 13 shows a state in which the spring 15b of FIG. 12 is in close contact. Similarly, FIG. 15c shown in FIG. 14 shows the entire conic coil spring in a quadratic curve in which the hem gradually expands like the foot of Mt. Fuji, and FIG. 15 shows a state in which the spring of FIG. 14 is in close contact. In actual telesco, the compression coil springs of one of the multiple covers may be in close contact with each other, but the compression coil springs of all the covers are not designed to be in close contact with each other. If the compression coil springs of all the covers are in close contact with each other and try to drive further, the stroke will be over the stroke of the machine body, and the telescoping will be damaged or the machine tool will be adversely affected. Although it is designed so that it does not come into close contact with each other, in this explanation, it will be given in close contact with each other for convenience in order to make the explanation easier to understand. In the case of the cylindrical coil spring described in the first embodiment, the height at the time of close contact is 8 (mm), and when the load of the telesco is 50 (N), it shrinks to a height of 10 (mm) and has a margin so as not to be in close contact. Although it is designed to be set, by gradually making it a quadratic curve with a hem that spreads like the foot of Mt. Fuji, part or all of the coil at the top of the coil overlaps with the coil at the bottom so that it sinks in sequence. If it sinks, the total height of the coil at the time of close contact can be made low, and the coil height at the time of close contact can be suppressed lower than that of a simple cylindrical coil spring or a conical coil spring. The difference in dimensions from a mere compression coil spring may not seem like a big deal at first glance, because even if the second coil from the bottom is completely buried in the bottom coil, it is just the wire diameter of the coil. It has a great meaning in the actual design, and the range of design is widened. In the case of the wire diameter described in the first embodiment, a 1.6 (mm) coil ”was used, so that the second-stage coil is 3/4 for the bottom coil and the third-stage coil is used for the second-stage coil. Assuming that the coil is 1/2 and the 4th stage coil sinks 1/4 into the 3rd stage coil, 3/4 + 1/2 + 1/4 = 1.5 and 1.5 x 1.6 = 2.4. In the case of a three-layered cover, the damper described in the second invention is attached to the two covers, so the total length of the cover at the time of close contact is 2.4 compared to the case where a simple cylindrical coil spring is used. × 2 = 4.8 (mm) can be shortened, and in the case of 5 layers, it can be shortened by 9.6 (mm). However, in reality, since all the covers are provided with a margin so that they do not come into close contact with each other, the value is smaller than this, but the effect is large.

The effect will be described with reference to FIG. FIG. 16 is a diagram comparing the dimensional relationship when the conventional rubber stopper is used in the upper figure and when the damper of the compression coil spring of the second invention of FIG. 12 or FIG. 14 is used in the lower figure. The dimensions of the table 1 are the same L and the stroke of the machine is the same in both the upper and lower figures, but the overall dimensions of the telesco and the dimensions of each cover are different as explained below. , 2a, 3a, 4a, 5a, and 6a, respectively. FIG. 16 shows a state in which the telescos 3 and 3a are contracted while the table 1 is moved to the right, and a state in which the telescos 2 and 2a on the left side are expanded. The overall dimension of the telesco 2 in the extended state of the telesco on the left side is L1 when the conventional rubber stopper in the above figure is used, whereas the compression coil spring of the present invention shown in FIGS. 12 and 14 has an overall dimension. When a damper is used, it is L2. Further, the telescos 3 and 3a on the right side are in a contracted state, and the overall dimensions are L3 and L4, respectively, and the dimensional relationship is as follows.
Telesco dimensions: L1-L2 = L3-L4 = ΔX
Cover dimensions: 4-4a = 5-5a = 6-6a = 1/3 ΔX
From the above relationship, when the telesco shrinks, the overall size of the telesco can be shrunk by ΔX larger than the conventional rubber stopper, and the size of each cover can also be reduced by 1/3 ΔX, so there is only a cost advantage in manufacturing the telesco. Not only that, because the telesco can be made smaller, the range of design can be expanded, which has the advantage of leading to space saving, and the effect is great.

The conventional rubber stopper made of NBR is called a rubber stopper, and the compression coil spring of the present invention is described as a damper, and the reason will be described. The conventional rubber stopper has a slight damper function because it absorbs a little impact, but as a function, it has a large role as a stopper and cannot be said to sufficiently suppress noise and vibration, whereas the compression coil of the present invention is used. Although the spring also functions as a stopper, it has a great effect as a damper that suppresses noise and vibration, so I decided to call it a damper. In addition, compression coil springs include linear cylindrical coil springs that have a proportional relationship between load and deflection, non-linear conical coil springs that do not have a proportional relationship, via barrel-shaped coil springs, and drum-shaped coil springs. However, in the present invention, it has been verified by a verification experiment that the effect is large on noise regardless of whether it is linear or non-linear. The verification revealed that the compression coil spring is effective as a telesco tamper without distinguishing between linear and non-linear.

In addition, since Telesco is a sheet metal product, some manufacturing errors cannot be denied. In addition, although there is a guide in the expansion / contraction direction, it does not always move linearly due to its structure, and it may meander slightly. If it meanders and contracts, the possibility that the compression coil spring will buckle cannot be said to be 0 (zero), but the several stages of coils near the bottom including the bottom or the entire coil spring move toward the bottom at the foot of Mt. Fuji. It also has the effect of improving stability by making it a quadratic curve that gradually spreads toward the hem. Although the description of stability is omitted in the first invention, it can be said that the inner conical coil spring of the compression coil spring is also superior in stability to the cylindrical coil spring and the like.

Furthermore, there are various types of coolant used when machining machine tools, such as cutting oil and weakly alkaline water-soluble cutting agents, but conventional rubber stoppers may swell or deteriorate depending on the coolant. On the other hand, since the compression coil spring of the present invention is made of steel, it has strong resistance and has an effect of extending the life. In the embodiment, an example in which SWP-B is used as the coil material of the coil spring is shown, but it is the present invention to use a stainless steel coil because it dislikes rust or to change the material due to the spring characteristics. It does not deviate and is not limited.

Further, a compression coil spring may be used as a damper, and a conventional rubber-like elastic body may be used together as a stopper. The meaning of using it together with the rubber elastic stopper is that the truncated cone coil spring is not used in such a dimension as described above, and the cylindrical coil spring used in Example 1 has a free length of 17.3 (mm) and a load of 50. When (N), it is made to have a height of 10 (mm), and if the adhesion height is 8 (mm), there is a difference of 2 (mm) until adhesion, but a rubber stopper is used together between the differences. It is also possible to prevent the compression coil springs from sticking to each other. In this case, most of the collision energy is absorbed by the compression coil spring, and finally the rubber elastic stopper is provided to expand and contract safely. Although not shown, the tip of the truncated cone coil spring is covered with a cap made of a plastic or rubber elastic body, or the mounting plate 7 or the standing plate 9 where the top of the truncated cone coil spring hits when contracted is covered with a plastic or rubber elastic body plate. Further noise reduction effect can be expected even if the above is embedded or pasted, and does not deviate from the present invention.

In the description of the conventional example, the rubber stopper 11 or the damper 15 of the cylindrical coil spring is attached to the standing plate 9 of the cover 5 and the standing plate 10 of the cover 6 in the first embodiment, but the compression coil of the present invention has been described. The spring may be attached to the mounting plate 7 of the cover 4 and the standing plate 9 of the cover 5, and the effect does not change. Further, it may be attached to the standing plate surface on the opposite side to the example of FIG. 6, and the effect does not change.

The wire diameter, number of turns, contact height, bottom outer diameter, top inner diameter, etc. of the coil of the conical coil spring vary depending on the size of the telesco, the weight of the telesco, the driving speed of the machine tool, etc., and were used in the description in the embodiment. It is not limited to the wire diameter and the number of turns of the compression coil spring. Further, although the description has been made using a small telesco in the embodiment, it can be used for medium and large telescos that do not use a pantograph, and is not limited. Further, in the embodiment, the example of the three-layer telesco has been described, but the same effect can be obtained and is not limited to the case of four-layer, five-layer or more. Further, in the embodiment, the example in which three cylindrical coil springs are used for one cover has been described, but a plurality of cylindrical coil springs such as four or five may be used for one cover, and the number of uses may be increased. It is effective for medium-sized and large-sized telescos, and even if it is small, it can be handled by reducing the wire diameter of the coil of the compression coil spring or reducing the center diameter.

As explained above, using a compression coil spring as a damper on the contraction side of the telesco has the effect of absorbing energy at the time of a collision extremely efficiently, greatly reducing noise, and greatly damping vibration, resulting in space. It can be said that it is an effective method because it can solve the problem and can be easily attached and detached.

It is effective as a damper on the contraction side of the telescopic cover, which is a protective cover for machine tools.

Diagram explaining the configuration, operation, and problems of conventional telesco AA sectional view of FIG. BB sectional view of FIG. Conventional NBR rubber stopper The figure explaining Embodiment 1 and Embodiment 2. CC sectional view of FIG. Partially enlarged view of part Y in FIG. Cylindrical coil spring of embodiment 1 Schematic showing cylindrical coil springs and screws Right side view of FIG. The conical coil spring of the second embodiment The figure explaining the 2nd invention The figure explaining the effectiveness of the 2nd invention The figure explaining the 2nd invention The figure explaining the effectiveness of the 2nd invention The figure explaining the effectiveness of the 2nd invention

1 ... Machine table 2 ... Telesco on the left side 3 ... Telesco on the right side 4 ... First cover 5 ... Second cover 6 ... Third cover 7 ... Mounting plate 9 ... Stand plate of the second cover 10 ... Stand plate of the third cover 11 ... Conventional NBR stopper 15 ... Cylindrical coil spring 15a of the first embodiment ... Embodiment 2 Conical coil springs 15b and 15c ... Compression coil springs 17 of the second invention ... Fastening seat

Claims (2)

In the telescopic cover of a machine tool, which consists of a plurality of covers that overlap each other and are driven by the drive of the machine machine and are expanded and contracted, the end of the bottom side coil of the compression coil spring is extended, and the extended coil is formed by the bottom of the compression coil spring. Bend inward to form a fastening seat for screwing at the same height as the bottom, and the inner diameter of the fastening seat is a substantially circular shape that allows the shaft of the screw used for fastening to pass but not the head. At least two or more are detachably attached to the standing plate or mounting plate constituting the cover via the fastening seat, and when the cover shrinks, it is attached to the standing plate or mounting plate of another cover that shrinks. A telescopic cover characterized in that the upper surface opposite the fastening seat collides with each other. In the compression coil spring having the screw fastening seat according to claim 1, a quadratic curve in which a part or all of the compression coil spring gradually expands toward the bottom where the fastening seat is provided like the foot of Mt. Fuji. A telescopic cover characterized by using a compression coil spring formed in a shaped shape.

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