JP2009184026A - Telescopic cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel telescopic cover for preventing wipers placed respectively on a plurality of protective covers from loosening and dropping, thereby surely preventing metal chips or the like from entering a movable part of a machine tool. <P>SOLUTION: The telescopic cover includes a plurality of nestedly stacked protective covers 2, 3, 4 and 5 including main plates 2a, 3a, 4a and 5a and side plates formed on both sides of the main plate, and is made stretchable through the entire protective covers. At the leading edges of the respective protective covers 2, 3 and 4 except the innermost cover 5 among the plurality of protective covers, there are provided a clamp 71 fixed to the protective cover and a wiper 72 having a lip 72b stuck to the clamp 71 and provided to partially overlap the leading edges of the protective covers 2, 3 and 4 to which the clamp 71 is fixed constantly in slide contact with the main plates 3a, 4a and 5a of the other protective covers 3, 4 and 5 or external surfaces of the side plates. The wiper 72 is made of an elastic material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a telescopic cover that is installed to protect the internal mechanical structure, for example, by covering a movable part of a machine or device such as a machine tool, a three-dimensional measuring machine, etc., with a plurality of retractable protective covers. The present invention relates to a telescopic cover that can prevent the wipers disposed on a plurality of protective covers from being loosened or dropped off.

  Machine tools and coordinate measuring machines are provided with machining heads and measuring units that are driven linearly, and movable parts with rail-shaped or shaft-shaped guide surfaces are arranged in the movement range of such machining heads. The machining head or the like moves forward and backward along the guide surface of the movable part. However, if metal scraps, dust, coolant liquid, or the like generated during processing adheres to the movable part, the accuracy of the processing head or the like may be hindered or a failure may occur. Therefore, conventionally, a telescopic cover in which a plurality of protective covers are arranged in a telescopic manner has been used in order to protect movable parts such as processing heads from metal scraps.

  The telescopic cover is, for example, fixed at the base end side to the machine tool main body and fixed at the distal end side to the processing head or the like, thereby performing an expansion / contraction operation along with the linear drive of the processing head or the like. By the way, since such a telescopic cover has a gap formed between the protective covers on one side and the other side of a plurality of nested protective covers, a machine tool or the like passes through this gap. In some cases, metal scrap, dust, coolant liquid, or the like enters the movable part of the steel plate, impairing the accuracy of the processing head or the like, or causing a failure. Accordingly, a telescopic cover is known in which a wiper is disposed in the gap to prevent metal dust or the like from entering the movable part in order to prevent such accuracy degradation and failure of the machining head (see FIG. 6). ).

  The telescopic cover 101 shown in FIG. 6 includes a wiper 104 formed of synthetic rubber or the like and having a lip 104b slidably in contact with the lower protective cover 103 at the tip, and a fastening portion 104a of the wiper 104. It is sandwiched between a lower surface portion of the upper protective cover 102 and a fixing bracket 105 fixed to the upper protective cover 102 via the wiper 104 by the fastening force of the set screw 106. is there. The relative movement between the upper protective cover 102 and the lower protective cover 103 causes the lip 104b of the wiper 104 to slide on the lower protective cover 103, and the lower lip 104b of the wiper 104 lowers the lip 104b. The metal scrap on the protective cover 103 on the side is rejected and prevented from entering a movable part such as a machine tool.

  However, in the conventional wiper 104, the fastening portion 104a is interposed between the upper protective cover 102 and the fixing metal 105, and is fixed by the set screw 106. The fastening portion 104a of the wiper 104 contracts or deteriorates due to a load transmitted to the fastening portion 104a from the lip portion 104b which is a sliding contact portion of the wiper 104 due to secular change or sliding operation due to the expansion / contraction operation, and the attached state Becomes unstable, causing the fastening portion 104a of the wiper 104 to rattle or fall off. When the fastening portion 104a of the wiper 104 rattles or falls off in this way, the wiper 104 prevents metal waste, dust, cutting fluid, etc. from entering the movable portion of a machine tool or the like. There was a problem that I could not.

  Therefore, the present invention has been proposed in order to solve the problems of the above-described conventional telescopic cover, and prevents the wipers disposed on the plurality of protective covers from being loosened or dropped off. The purpose of this is to reliably prevent the intrusion of moving parts into machine tools, etc., and to maintain the positioning accuracy of the machining head, etc. for a long period of time, or to avoid cases that cause failure. is there.

  In order to achieve the above-described object, a telescopic cover according to the first invention (the invention described in claim 1) includes a plurality of protective covers including a main plate portion and side plate portions formed on both sides of the main plate portion. A telescopic cover that is arranged in a nested state and is extendable and retractable over the entire protective cover, wherein each of the protective covers excluding the protective cover arranged on the innermost side among the plurality of protective covers. On the front end side, a fixing bracket fixed to the protective cover, and the main plate portion of another protective cover that is bonded to the fixing bracket and arranged to partially overlap the front end side of the protective cover to which the fixing bracket is fixed Alternatively, the wiper has a lip portion that is always in sliding contact with the outer surface of the side plate portion, and a wiper formed of an elastic material.

  In the first invention, the wiper is bonded to the fixing bracket, and is not fixed by screwing in a state sandwiched between the protective cover and the fixing bracket like a conventional telescopic cover, Each wiper is contracted or deteriorated due to aging or sliding movement of each protective cover over a long period of time or a load transmitted from the sliding contact portion to the screwing portion due to sliding operation. It becomes stable and can prevent the wiper from rattling or falling off.

  In the first aspect of the invention, the method of bonding the wiper fixed to the fixing bracket is not limited, and the wiper may be bonded with an adhesive interposed between the wiper and the fixing bracket. You may adhere | attach by the vulcanization adhesion | attachment (vulcanization adhesion of Claim 5) which adhere | attaches a metal simultaneously with shaping | molding. Examples of the wiper material made of an elastic material include natural rubber, synthetic rubber nitrile butadiene rubber (NBR), hydrogenated nitrile rubber (HNBR), and ester-bonded polyester urethane rubber (AU) (AU). ), Ether-bonded polyether urethane rubber (EU), or the like can be used. Each of the protective covers may be connected to the pantograph mechanism or may be simply combined in a nested manner without being connected by the pantograph mechanism.

  According to a second invention (invention according to claim 2), in the first invention, the fixing bracket is parallel to or inclined with respect to the outer surface of the main plate portion or the side plate portion of the other protective cover. The wiper has a first facing surface that is bonded to the facing surface, and a second bonding surface that is bonded to the tip surface. It is characterized by having.

  In the second aspect of the invention, the wiper is attached not only to the first bonding surface bonded to the facing surface formed on the fixing bracket but also to the fixing bracket. Since the adhesive surface is formed and bonded to the fixing metal fitting by these first and second adhesive surfaces, the wiper sliding operation by the expansion and contraction operation of each protective cover is repeated over a long period of time. However, the risk of falling off can be effectively prevented. That is, since the front end surface formed on the fixing bracket and the second bonding surface of the wiper bonded thereto are surfaces formed in a direction intersecting with the expansion / contraction direction of each protective cover, Dropping can be further prevented as compared with the case of only adhesion between the opposing surface and the first adhesive surface of the wiper.

  According to a third invention (invention of claim 3), in the first or second invention, the lip portion of the wiper is always on at least the outer surface of the main plate portion or the side plate portion of the other protective cover. A low friction resistance resin sheet is bonded to a portion in sliding contact.

  In the third aspect of the invention, since the low-friction resistance resin sheet is adhered to the lip portion of the wiper at least at a portion that is always in sliding contact with the outer surface of the main plate portion or the side plate portion of the other protective cover, When each protective cover constituting the cover expands and contracts, the lip portion of the wiper which is an elastic material slides through the low friction resistance resin sheet without directly sliding with the sliding surface. Can reduce the sliding frictional force (sliding frictional resistance). That is, by reducing this sliding frictional force, the load transmitted from the sliding portion between the lip portion of the wiper and the sliding surface to the fixing portion of the fixing bracket fixed to the protective cover can be reduced. In this fixing portion, a so-called loosening phenomenon called rattling is unlikely to occur, and the fixing bracket can be prevented from being loosened or dropped off. Further, since the sliding frictional force generated at the sliding portion can be reduced, the wear resistance can be improved and the inclusion of foreign matters such as metal scraps can be prevented.

  In addition, as a raw material of the low friction resistance resin sheet, polytetrafluoroethylene (PTFE) which is a fluororesin, a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA), a tetrafluoroethylene / hexafluoropropylene copolymer ( FEP), polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene-ethylene copolymer (ETFE), polyvinylidene fluoride (PVDF), aliphatic polyamide (nylon), aromatic polyamide (Kevlar, etc.) Any resin sheet such as polyester (polyethylene terephthalate (PET)) can be used.

  According to a fourth invention (invention according to claim 4), in the third invention, the low friction resistance resin sheet is at least a lip portion of the wiper and is a main plate portion or a side plate of the other protective cover. The distal end side that is always in sliding contact with the outer surface of the portion is adhered to the lip portion while being exposed to the outside, while the proximal end side is adhered while being embedded in the wiper. Is.

  In the fourth invention, the low friction resistance resin sheet is not only bonded only to the lip portion of the wiper, but also the base end side is embedded in the warper. Even if a tensile load is applied to the entire low friction resistance resin sheet, it is possible to effectively prevent a risk that the low friction resistance resin sheet peels off from the lip portion of the wiper. That is, the base end side of the low friction resistance resin sheet is embedded in the wiper and bonded to increase the bonding area, so that the low friction resistance resin sheet is against the tensile load. Peeling can be further prevented as compared with the case where the adhesive is adhered only to the lip portion of the wiper. In particular, when fluororesin is used as the material of the low friction resistance resin sheet and rubber is used as the elastic material that is the material of the wiper, it is difficult to firmly adhere to each other. Thus, the adhesive strength can be increased, and a stable attachment state can be maintained over a long period of time.

  According to a fifth invention (invention according to claim 5), in the third or fourth invention, the wiper is made of rubber, and the wiper and the fixing metal are bonded together and the low friction resistance resin is used. Both the sheet and the wiper are bonded by vulcanization.

  In the fifth aspect of the invention, the wiper is made of rubber, and the adhesion between the wiper and the fixing bracket and the adhesion between the low friction resistance resin sheet and the wiper are performed simultaneously with the rubber molding of the wiper, Because it is a vulcanized adhesive that adheres to the low friction resistance resin sheet, the wiper is bonded to the fixing metal fitting and the low friction resistance resin sheet with a strong adhesive force due to the bonding between the molecules, and the wiper falls off the fixing metal fitting, Or it can prevent that a low friction-resistance resin sheet peels from a wiper. In addition, as a vulcanization adhesion method, a direct vulcanization adhesion method in which a compound such as natural rubber, synthetic rubber, urethane rubber, a fixing metal fitting and a low friction resistance resin sheet are overlapped and directly bonded during press vulcanization, or Any of indirect vulcanization bonding methods in which a vulcanized adhesive is applied to a fixing metal fitting and a low friction resistance resin sheet and bonded via the vulcanized adhesive may be used.

  In the telescopic cover according to the first invention (the invention according to claim 1), the wiper is bonded to the fixing bracket, and the screw is sandwiched between the fixing bracket and the protective cover like the conventional telescopic cover. Since it is not fixed by the stopper, the wiper contracts due to the secular change of each protective cover over a long period of time or the load transmitted from the sliding contact part to the screwing part due to the sliding operation. Or the deterioration of the mounting state becomes unstable, and the wiper can be prevented from rattling or dropping off. As a result, it is possible to reliably prevent metal scraps from entering the movable part of the machine tool, etc., and maintain the positioning accuracy of the machining head etc. over a long period of time, or to avoid a case that causes a failure. it can.

  In the second invention (the invention described in claim 2), the wiper is not only the first adhesive surface bonded to the facing surface formed on the fixing metal fitting, Since the second adhesive surface to be bonded to the tip end surface is formed, and the first and second adhesive surfaces are bonded to the fixing bracket, the sliding operation of the wiper by the expansion and contraction operation of each protective cover is performed for a long time. Even if it is repeated over a long period of time, the risk of falling off can be effectively prevented, and metal debris etc. can be reliably prevented from entering movable parts such as machine tools, and over a long period of time. It is possible to maintain the accuracy of the movable part such as the machining head or to avoid a case that causes a failure.

  In the third invention (the invention described in claim 3), the lip portion of the wiper is provided with a low friction resistance resin sheet at least at a portion which is always in sliding contact with the outer surface of the main plate portion or the side plate portion of the other protective cover. Because it is bonded, the sliding frictional force can be reduced, so that the load transmitted from the sliding portion between the lip portion of the wiper and the sliding surface to the fixing portion of the fixing bracket fixed to the protective cover can be reduced. In this fixing portion, a so-called loosening phenomenon called rattling is unlikely to occur, and the fixing bracket can be prevented from loosening or falling off. In addition, since the sliding frictional force generated at the sliding portion can be reduced, the wear resistance can be improved. As a result, it is possible to reliably prevent metal scraps from entering the movable part of the machine tool, etc., and maintain the positioning accuracy of the machining head etc. over a long period of time, or to avoid a case that causes a failure. it can.

  Further, in the fourth invention (invention of claim 4), the low friction resistance resin sheet is not only bonded to the lip portion of the wiper, but also the base end side is embedded in the warper, Even if a tensile load is applied to the entire low friction resistance resin sheet by the expansion and contraction operation of each protective cover, the risk of the low friction resistance resin sheet peeling from the lip portion of the wiper can be effectively prevented. As a result, it is possible to reliably prevent metal scraps from entering the movable part of the machine tool, etc., and maintain the positioning accuracy of the machining head etc. over a long period of time, or to avoid a case that causes a failure. it can.

  In the fifth invention (the invention described in claim 5), the wiper is made of rubber, and the adhesion between the wiper and the fixing metal and the adhesion between the low friction resistance resin sheet and the wiper are the rubber of the wiper. Since it is a vulcanized adhesive that bonds to the fixing bracket and the low friction resistance resin sheet simultaneously with molding, the wiper is bonded to the fixing bracket and the low friction resistance resin sheet with a strong adhesive force by bonding between the molecules. It is possible to prevent the low-friction resistance resin sheet from being detached from the fixing metal or from the wiper. As a result, it is possible to reliably prevent metal scraps from entering the movable part of the machine tool, etc., and maintain the positioning accuracy of the machining head etc. over a long period of time, or to avoid a case that causes a failure. it can.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode of a telescopic cover for carrying out the present invention will be described in detail below with reference to the drawings. The telescopic cover 1 according to this embodiment is mounted on a machine tool (not shown).

  As shown in FIG. 1 or FIG. 2, the telescopic cover 1 includes first to fourth protective covers 2, 3, 4, 5 made of iron, and these first to fourth protective covers 2, 3. , 4, and 5, and a pantograph mechanism 6, which is extendable in the + Y and −Y directions shown in FIG. 1. The first to fourth protective covers 2, 3, 4, and 5 include a main plate portion 2a, 3a, 4a, and 5a and a left plate portion (this book) formed on the left side of the main plate portions 2a, 3a, 4a, and 5a. Invention side plate portions) 2b, 3b, 4b, 5b, right side plate portions (side plate portions of the invention) 2c, 3c, 4c, 5c formed on the right side of the main plate portions 2a, 3a, 4a, 5a, and the above First to fourth rear plate portions 8, 9, 10, 11 formed at the rear ends of the main plate portions 2a, 3a, 4a, 5a.

  And the said 1st protective cover 2 is a member by which the rear-plate part 8 of the base end side is fixed to the machine tool main body which is not shown in figure, On the other hand, the said 4th protective cover 5 is the front of the front end side. This is a member fixed to a machining head (not shown) in which the plate portion 12 moves forward and backward. The second protective cover 3 is disposed inside the first protective cover 2, and the third protective cover 4 is disposed inside the second protective cover 3, and the fourth protective cover 4 is disposed. The cover 5 is arranged inside the third protective cover 4, and the shape of the first to fourth protective covers 2, 3, 4 and 5 is such that they can be arranged in a nested manner. The first protective cover 2 is disposed on the outermost side and is gradually formed into a small shape.

  The first to fourth protective covers 2, 3, 4, 5 configured in this way are the guide plates 15, 16, 17, 18 and the first to fourth short links 24, constituting the pantograph mechanism 6. 25, 26, 27, first to fourth long links 28, 29, 30, 31 and first to tenth connecting shafts 34 ... 43, and a fourth protection together with a machining head (not shown). When the cover 5 moves forward and backward, the second to fifth protective covers 3, 4 and 5 perform an expansion / contraction operation.

  Further, on the outside of the second to fourth rear plate portions 9, 10, 11 shown in FIG. 1 or FIG. 2, first to sixth impact absorbing members 44, 45, made of synthetic rubber or urethane rubber are provided. 46, 47, 48, and 49 are fixed, and the telescopic cover 1 is configured to absorb an impact and prevent noise when the telescopic cover 1 is most contracted. That is, when the telescopic cover 1 is most contracted, the first and second shock absorbing members 44 and 45 fixed to the second rear plate portion 9 shown in FIG. And the third to fourth shock absorbing members 46 and 47 fixed to the third rear plate portion 10 collide with the second rear plate portion 9 facing each other, and contact the fourth rear plate portion 11. The fixed fifth to sixth shock absorbing members 48 and 49 are arranged so as to collide with the third rear plate portion 10 facing each other, so as to absorb the shock caused by the collision and prevent the generation of noise. It is configured.

  And the wiper which comprises this embodiment is integrated in the 1st thru | or 3rd wiper assembly 51,52,53 mentioned later, and the said 1st thru | or 4th protective covers 2,3,4,5 are included. The first to third protections except for the fourth protective cover 5 which is located between the first and fourth protective covers 2, 3, 4 and 5 shown in FIG. First to third wiper assemblies 51, 52, and 53 are disposed on the front end sides of the covers 2, 3, and 4, respectively, and these wiper assemblies 51, 52, and 53 are provided with first to third embodiments to be described later. Each wiper 72, 82, or 92 constituting the form is fixed.

  Hereinafter, the first to third wiper assemblies 51, 52, and 53 will be described. The first wiper assembly 51 is between the first protective cover 2 and the second protective cover 3 and is fixed to the front end portion of the first protective cover 2. The wiper assembly 52 is between the second protective cover 3 and the third protective cover 4 and is fixed to the tip of the second protective cover 3. The third wiper assembly 53 is between the 3rd protective cover 4 and the 4th protective cover 5, Comprising: It fixes to the front-end | tip part of the 3rd protective cover 4. As shown in FIG.

  Further, these wiper assemblies 51, 52, 53 are first to third main plate side wiper assemblies 54 fixed to the main plate portions 2a, 3a, 4a of the protective covers 2, 3, 4 shown in FIG. , 57, 60, first to third left-side plate-side wiper assemblies 55, 58, 61 fixed to the left-side plate portions 2b, 3b, 4b shown in FIG. 1, and the right-side plate portions 2c, 3c, 4c. The first to third right side plate-side wiper assemblies 56, 59, and 62 are fixed to each other. When these are arranged for each protective cover, the first protective cover 2 includes a first main plate-side wiper assembly 54 fixed to the main plate portion 2a, and a first left-side plate-side wiper fixed to the left-side plate portion 2b. An assembly 55 and a first right side plate-side wiper assembly 56 fixed to the right side plate portion 2c are disposed.

  The second protective cover 3 includes a second main plate-side wiper assembly 57 fixed to the main plate portion 3a, a second left-side plate-side wiper assembly 58 fixed to the left-side plate portion 3b, and a right-side plate portion. A second right side wiper assembly 59 fixed to 3c is arranged. The third protective cover 4 includes a third main plate-side wiper assembly 60 fixed to the main plate portion 4a, a third left-side plate-side wiper assembly 61 fixed to the left-side plate portion 4b, and a right-side plate portion. A third right side wiper assembly 62 fixed to 4c is arranged. Each of the wiper assemblies 54 to 62 includes a wiper 72 shown in FIG. 3 constituting a first embodiment to be described later, a wiper 82 shown in FIG. 4 constituting a second embodiment, and a third wiper assembly. The wiper 92 shown in FIG. 5 constituting the embodiment or a wiper (not shown) having the same configuration as these is fixed.

  As described above, the wiper assemblies 54 to 62 disposed at the front ends of the protective covers 2, 3, and 4 have the same configuration except that the length in the direction orthogonal to the expansion / contraction direction is different. FIG. 3 is a partially enlarged view of the first main plate-side wiper assembly 54 fixed to the front end portion of the main plate portion 2a of the first protective cover 2 shown in FIG. 4 showing the present embodiment and FIG. 5 showing the third embodiment, and explanations of the other wiper assemblies 55 to 62 are omitted. In the following description, since the reference numerals of the first main plate-side wiper assembly 54 are duplicated in the respective embodiments, the first main plate-side wiper assembly 54 in the first embodiment shown in FIG. The second embodiment shown in FIG. 4 is represented as a first main plate-side wiper assembly 54A, and the third embodiment shown in FIG. 5 is represented as a first main plate-side wiper assembly 54B.

  First, as shown in FIG. 3A, the wiper assembly 54 constituting the first embodiment is disposed on the front end side of the main plate portion 2a of the first protective cover 2, and is formed on the lower surface portion 2d thereof. A fixed fixture 71, a wiper 72 made of an elastic material bonded to the fixed fixture 71, a lip portion side sheet (low friction resistance resin sheet of the present invention) 73 and a body bonded to the wiper 72 It is comprised from the part side sheet | seat 75 and the some set screw 74 which fixes the said fixing metal fitting 71 to the said main-plate part 2a.

  Among these, the shape of the fixing metal 71 is substantially the same as the length in the direction orthogonal to the expansion / contraction direction of the main plate portion 3a of the second protective cover 3 shown in FIG. The cross section shown in FIG. 3 (a) is inclined parallel to the parallel portion 71a having a facing surface 71e parallel to the main plate portion 3a of the second protective cover 3, and from the front side of the parallel portion 71a to the lower left in the figure. An inclined portion 71b that is bent and has an opposing surface 71f that is inclined with respect to the main plate portion 3a, and is provided with a male screw of a set screw 74 at a plurality of positions in the length direction of the parallel portion 71a. A plurality of female screws 71c that are screwed together (reference numerals are omitted) are formed.

  The fixing metal 71 has an upper surface 71d in contact with the lower surface 2d of the main plate portion 2a of the first protective cover 2 and is tightened by a plurality of set screws 74 and screw holes 2f of the first protective cover 2. It is worn. The shape of the fixing bracket 71 is not limited to the one having the parallel part 71a and the inclined part 71b. For example, a part corresponding to the inclined part 71b may be formed on a straight extension of the parallel part 71a. In addition, the tip side of the main plate portion 2a of the first protective cover 2 may be bent in parallel to the inclined portion as a portion corresponding to the inclined portion 71b.

  A wiper 72 made of nitrile butadiene rubber (NBR), which is a synthetic rubber (elastic material), is bonded to the fixing metal 71 by vulcanization bonding described later. The fixing metal 71 includes an opposing surface 71e parallel to the lower surface portion 2d of the main plate portion 2a of the first protective cover 2 and the upper surface of the main plate portion 3a of the second protective cover 3, and the opposing surface. 71e, an inclined facing surface 71f that is inclined so as to gradually approach the main plate portion 3a of the second protective cover 3, a front end surface 71g that intersects with the inclined facing surface 71f, and the facing surface A rear end surface 71h that intersects 71e. Further, as shown in FIG. 3A, the wiper 72 is formed with a barrel portion 72a and a lip portion 72b extending from the front side of the barrel portion 72a so as to incline to the lower left in the drawing. Yes.

  The wiper 72 has, on its upper side, a first bonding surface 72c bonded to the facing surface 71e of the fixing bracket 71, a second bonding surface 72d bonded to the facing surface 71f of the fixing bracket 71, and a fixing bracket. 71 has a third bonding surface 72e bonded to the front end surface 71g of the 71 and a fourth bonding surface 72f bonded to the rear end surface 71h of the fixing metal 71, and is integrally bonded to the fixing metal 71. Yes. The first adhesive surfaces constituting the present invention are the first adhesive surface 72c and the second adhesive surface 72d, and the second adhesive surfaces constituting the present invention are the third adhesive surface 72e. It is.

  Further, as shown in FIG. 3A, the lip portion 72b of the wiper 72 is formed in a cone shape that is thinned from the body portion 72a side toward the distal end side. Further, the lip portion 72b of the wiper 72 has a concave surface 72h at a position on the lower surface side of the lip portion 72b from the thinnest tip portion 72g toward the upper right in the figure on the body portion 72a side. A lip portion side sheet (low friction resistance resin sheet) formed so as to be inclined with respect to the main plate portion 3a of the protective cover 3 and made of polytetrafluoroethylene (PTFE) as a fluororesin on the concave surface 72h. 73 is integrally bonded by vulcanization bonding described later. The bonding surface to which the lip portion side sheet 73 is bonded is not necessarily provided with a concave portion like the concave surface 72h, and may be the same surface as the lip portion side lower surface 72j.

  In the first main plate wiper assembly 54 constituting the first embodiment, as shown in FIG. 3A, a wiper 72 is bonded to a fixing metal 71, and the fixing metal 71 is connected to the first metal plate 71. The lower surface of the lip portion side sheet 73 bonded to the lower surface side of the wiper 72 in the state of being fastened to the lower surface portion 2d of the main plate portion 2a of the protective cover 2 by a set screw 74 (reference numeral is omitted). However, it is arranged so as to partially overlap the front end side of the main plate portion 2a of the first protective cover 2, and is always in sliding contact with the main plate portion 3a of the other protective cover 3 that moves relatively.

  Therefore, in the first main plate-side wiper assembly 54, the lip portion side sheet 73 bonded to the lower surface side of the wiper 72 slides with the main plate portion 3a of the second protective cover 3 that moves relatively. Therefore, by repeating the telescopic operation of the telescopic cover 1, even if metal debris, dust, coolant liquid or the like adheres to the main plate portion 3a of the second protective cover 3, it adheres to the lower surface side of the wiper 72. It is possible to prevent the metal scrap, dust, coolant liquid and the like from being discharged by the lower surface of the lip portion side sheet 73 and entering the movable portion of the machine tool or the like.

  Further, as shown in FIG. 3A, a body lower surface 72i parallel to the main plate 3a of the second protective cover 3 is formed on the body 72a of the wiper 72, and fluorine is formed on the body lower surface 72i. A body side sheet (low friction resistance resin sheet) 75 made of polytetrafluoroethylene (PTFE), which is a resin, is integrally bonded by vulcanization bonding described later. The body portion side sheet 75 bonded to the body portion 72a of the wiper 72 and the body portion lower surface 72i of the body portion 72a is connected to the lip portion 72b of the wiper 72 and the lip portion side sheet 73 bonded to the lip portion 72b. The lip portion side sheet 73 is always in proper contact with the main plate portion 3a of the second protective cover 3 by preventing an excessive pressing force due to gravity or the like of the first protective cover 2 from being applied. It is arranged to regulate so as to slide with pressure.

  That is, when a pressing force is applied to the lip portion 72b shown in FIG. 3, the lip portion 72b of the wiper 72 formed of an elastic material is elastically deformed as shown in FIG. 3B, and FIG. The distance Da between the lower surface of the body side sheet 75 shown in FIG. 3 and the upper surface of the second protective cover 3 is reduced to a distance Di shown in FIG. 3B, and the lip portion 72b of the wiper 72 is caused by the pressing force accompanying this reduction. And the lip portion side sheet 73 are pressed. Therefore, the positional relationship between the body portion 72a and the lip portion 72b of the wiper 72 is such that the distance Di = 0 shown in FIG. 3B (the lower surface of the body portion side sheet 75 is in contact with the upper surface of the second protective cover 3) ), An excessive contact pressure is not applied between the lip portion side sheet 73 and the second protective cover 3. As described above, in the present embodiment, since the body portion 72a is formed in the above-described positional relationship, an excessive contact pressure is not applied to the lip portion side sheet 73 (the front end side thereof). The improvement can be achieved, and it is possible to prevent the tip portion sliding with the main plate portion 3a of the second protective cover 3 from peeling off and turning up.

  In addition, as a vulcanization bonding method for bonding the fixing bracket 71, the wiper 72, the lip portion side sheet 73 and the trunk portion side sheet 75, a compound of nitrile butadiene rubber (NBR) which is a material of the wiper 72 and the fixing bracket are used. 71 and the sheets 73 and 75 may be superposed and a direct vulcanization bonding method may be employed in which these are directly bonded during press vulcanization, or a vulcanizing adhesive may be used for the fixing metal 71 and the sheets 73 and 75. An indirect vulcanization bonding method in which the vulcanization adhesive is applied to the film and bonded through the vulcanized adhesive may be employed. In addition, such an adhesion method is such that the fixing metal 71, the lip portion side sheet 73, and the trunk portion side sheet 75 are disposed in a predetermined vulcanization mold (not shown), and the unvulcanized molded on the wiper 72 therebetween. By injecting rubber into the vulcanization mold, the wiper 72 is molded integrally with the fixing bracket 71, the lip portion side sheet 73, and the trunk portion side sheet 75, and the fixing bracket 71, the lip portion side sheet 73, A method of vulcanizing and adhering to the body side sheet 75, or after disposing the fixing bracket 71 in a predetermined vulcanizing mold, disposing unvulcanized rubber which is a material of the wiper 72, The wiper 72 is molded integrally, and thereafter, an unvulcanized rubber is interposed between the concave surface 72 h formed on the wiper 72 and the lip portion side sheet 73 so that the lip portion side sheet 73 is made to be a concave surface of the wiper 72. Added to 72h In addition to bonding, unvulcanized rubber is interposed between the body lower surface 72i and the body side sheet 75, and the body lower surface 72i and the body side sheet 75 are vulcanized and bonded. A method of adhering the fixing metal 71, the wiper 72, the lip portion side sheet 73, and the trunk portion side sheet 75 in stages may be employed. If each of these methods is employed, the lip portion side sheet 73 and the trunk portion side sheet 75 (fluororesin) and the wiper 72 (nitrile butadiene rubber (NBR), which have excellent releasability but are non-adhesive, are used. ) The adhesive strength with the compound) is increased.

  Further, the lower end portion of the set screw 74 that is fastened to the body portion 72a of the wiper 72 does not interfere with the body portion 72a of the wiper 72 below the set screw 74 shown in FIG. It is preferable to form a relief hole (not shown).

  The first main plate-side wiper assembly 54 constituting the first embodiment is configured as described above, but is another wiper assembly as shown in FIG. 1 or FIG. A left-side plate-side wiper assembly 55, a right-side plate-side wiper assembly 56 fixed to the protective cover 2, a main-plate-side wiper assembly 57, a left-side plate-side wiper assembly 58, and a right-side plate-side wiper assembly 59 fixed to the second protective cover 3. The main plate-side wiper assembly 60, the left-side plate-side wiper assembly 61, and the right-side plate-side wiper assembly 62 fixed to the third protective cover 4 have the same configuration except for the length.

  Next, as shown in FIG. 4, the wiper assembly 54A constituting the second embodiment is arranged on the front end side of the main plate portion 2a of the first protective cover 2, and is fixed to the lower surface portion 2d thereof. The fixing bracket 81, the wiper 82 made of an elastic material bonded to the fixing bracket 81, the lip portion side sheet 83 (low friction resistance resin sheet of the present invention) and the trunk portion side sheet 85 bonded to the wiper 82. And a plurality of set screws 84 for fixing the fixing bracket 81 to the main plate portion 2a. The wiper assembly 54A constituting the second embodiment is different from the wiper assembly 54 constituting the first embodiment in that the base end portion of the lip side sheet 83 shown in FIG. The structure of bonding in the state of being embedded in 82 is different, and the other structure is the same as that of the wiper assembly 54 constituting the first embodiment.

  Among these, the shape of the fixing bracket 81 is substantially the same length as the length in the direction orthogonal to the expansion / contraction direction of the main plate portion 3a of the second protective cover 3 shown in FIG. The cross section shown in FIG. 4 is bent in such a manner that a parallel part 81a having a facing surface 81e parallel to the main plate part 3a of the second protective cover 3 is inclined to the lower left in the figure from the front side of the parallel part 81a. And an inclined portion 81b having an opposing surface 81f that is inclined with respect to the main plate portion 3a, and a plurality of male screws (symbols are denoted by reference numerals) in the longitudinal direction of the parallel portion 81a. A plurality of female screws 81c that are screwed to each other are formed.

  The upper surface 81d of the fixing bracket 81 is in contact with the lower surface portion 2d of the main plate portion 2a of the first protective cover 2, and is fastened by a plurality of set screws 84 and screw holes 2f of the first protective cover 2. It is worn. The shape of the fixing bracket 81 is not limited to the shape having the parallel part 81a and the inclined part 81b. For example, a part corresponding to the inclined part 81b may be formed on a straight extension of the parallel part 81a. Alternatively, the tip side of the main plate portion 2a of the first protective cover 2 may be bent in parallel to the inclined portion as a portion corresponding to the inclined portion 81b.

  A wiper 82 made of nitrile butadiene rubber (NBR), which is a synthetic rubber (elastic material), is bonded to the fixing fitting 81 by vulcanization adhesion described later. The fixing bracket 81 includes an opposing surface 81e parallel to the lower surface portion 2d of the main plate portion 2a of the first protective cover 2 and the upper surface of the main plate portion 3a of the second protective cover 3, and the opposing surface. An inclined facing surface 81f that is continuous with 81e and is gradually inclined so as to approach the main plate portion 3a of the second protective cover 3, a front end surface 81g that intersects with the inclined facing surface 81f, and the facing surface A rear end surface 81h that intersects with 81e. In addition, as shown in FIG. 4, the wiper 82 is formed with a body portion 82a and a lip portion 82b that extends from the front side of the body portion 82a so as to incline to the lower left in the drawing.

  The wiper 82 has, on its upper side, a first bonding surface 82c bonded to the facing surface 81e of the fixing bracket 81 and a second bonding surface bonded to the inclined facing surface 81f of the fixing bracket 81. 82d, a third bonding surface 82e bonded to the front end surface 81g of the fixing bracket 81, and a fourth bonding surface 82f bonded to the rear end surface 81h of the fixing bracket 81. It is bonded together. The first adhesive surfaces constituting the present invention are the first adhesive surface 82c and the second adhesive surface 82d, and the second adhesive surfaces constituting the present invention are the third adhesive surface 82e. It is.

  Further, as shown in FIG. 4, the lip portion 82 b of the wiper 82 is formed in a conical shape that is thinned from the trunk portion 82 a side toward the distal end side. Further, the lip portion 82b of the wiper 82 has a lip portion-side lower surface 82j at a position from the thinnest tip portion 82g toward the upper right side of the body portion 82a on the lower surface side of the lip portion 82b. The second protective cover 3 is formed so as to be inclined with respect to the main plate portion 3a, and the lip portion is formed in the wiper 82 from the intersection (not shown) of the lip portion side lower surface 82j and the middle step portion lower surface 82k. A recess 82m having the same surface as the side lower surface 82j is formed. A lip portion side sheet (low friction resistance resin sheet) 83 made of polytetrafluoroethylene (PTFE), which is a fluororesin, is provided between the lip portion side lower surface 82j and the recess 82m of the wiper 82. The front end side that is always in sliding contact with the main plate portion 3a of the protective cover 3 is exposed to the outside and is integrally bonded by vulcanization bonding described later.

  That is, the lip portion side sheet 83 is bonded to the lip portion side lower surface 82j with the tip end side exposed from the wiper 82, and the lip portion side sheet 83 is embedded in the wiper 82 while the base end portion is embedded in the wiper 82. Bonded in the recess 82m. Therefore, the lip portion side sheet 83 can effectively prevent the risk that the lip portion side sheet 83 is peeled off from the lip portion 82b of the wiper 82 even when a tensile load is applied by the expansion and contraction operation of each protective cover. . That is, the base end portion of the lip portion side sheet 83 is embedded and bonded in the concave portion 82m of the wiper 82, so that the adhesion area is increased. Can be further prevented from being peeled off as compared with the case where the adhesive is adhered only to the lip portion lower surface 82j of the wiper 82.

  In the first main plate-side wiper assembly 54A constituting the second embodiment, as shown in FIG. 4, a wiper 82 is bonded to a fixing metal 81, and the fixing metal 81 is used as the first protective cover 2. The lower surface (reference numeral is omitted) of the lip portion side sheet 83 adhered to the lower surface side of the wiper 82 in the state of being fastened to the lower surface portion 2d of the main plate portion 2a by the set screw 84. The first protective cover 2 is disposed so as to partially overlap the front end side of the main plate portion 2a, and is always in sliding contact with the main plate portion 3a of the other protective cover 3 that moves relatively.

  Therefore, in the first main plate-side wiper assembly 54A, the lip portion-side sheet 83 bonded to the lower surface side of the wiper 82 slides with the main plate portion 3a of the second protective cover 3 that moves relatively. Therefore, by repeating the telescopic operation of the telescopic cover 1, even if metal debris, dust, coolant liquid or the like adheres to the main plate portion 3a of the second protective cover 3, it adheres to the lower surface side of the wiper 82. It is possible to prevent the metal scrap, dust, coolant liquid and the like from being discharged by the lower surface of the lip portion side sheet 83 and entering the movable portion of the machine tool or the like.

  Further, as shown in FIG. 4, a lower surface 82i parallel to the main plate portion 3a of the second protective cover 3 is formed on the body portion 82a of the wiper 82. Polytetrafluoroethylene, which is a fluororesin, is formed on the lower surface 82i. The body side sheet (low friction resistance resin sheet) 85 is integrally bonded by vulcanization bonding described later using (PTFE) as a raw material. The body portion side sheet 85 bonded to the body portion 82a of the wiper 82 and the lower surface 82i of the body portion 82a is connected to the lip portion 82b of the wiper 82 and the lip portion side sheet 83 bonded to the lip portion 82b. This prevents the lip portion side sheet 83 from always contacting the main plate portion 3a of the second protective cover 3 with an appropriate contact pressure. It is arranged to be regulated so as to slide.

  That is, the lip portion 82b of the wiper 82 formed of an elastic material is elastically deformed when a pressing force is applied to the lip portion 82b (see FIG. 3B), and the body side sheet 85 shown in FIG. The distance between the lower surface and the upper surface of the second protective cover 3 is reduced, and the lip portion 82b of the wiper 82 and the lip portion side sheet 83 are pressed by the pressing force accompanying the reduction. Therefore, the positional relationship between the body portion 82a and the lip portion 82b of the wiper 82 is such that the lower surface of the body portion side sheet 85 is in contact with the upper surface of the second protective cover 3 and the second protection cover 83. It arrange | positions so that an excessive contact pressure may not be loaded between the covers 3. FIG. Thus, in the present embodiment, since the body portion 82a is formed in the above-described positional relationship, an excessive contact pressure is not applied to the lip portion side sheet 83, so that the wear resistance can be improved. It can prevent that the front-end | tip part which slides with the main board part 3a of the 2nd protective cover 3 peels, and it turns up.

  In addition, as a vulcanization adhesion method for adhering each of the fixing metal part 81, the wiper 82, the lip part side sheet 83, and the body part side sheet 85, it can be adhered in the same manner as in the first embodiment. Further, below the set screw 84 shown in FIG. 4, the lower end portion of the tightened set screw 84 is not shown in the body portion 82 a of the wiper 82 so that it does not interfere with the body portion 82 a of the wiper 82. It is preferable to form a relief hole.

  The first main plate-side wiper assembly 54A constituting the second embodiment is configured as described above, and is another wiper assembly, which is the first protection shown in FIG. 1 or FIG. Left side plate side wiper assembly 55, right side plate side wiper assembly 56 fixed to cover 2, main plate side wiper assembly 57, left side plate side wiper assembly 58, right side plate side wiper assembly 59 fixed to second protective cover 3, The main plate-side wiper assembly 60, the left-side plate-side wiper assembly 61, and the right-side plate-side wiper assembly 62 fixed to the third protective cover 4 have the same configuration except for the length.

  Next, as shown in FIG. 5, the wiper assembly 54 </ b> B constituting the third embodiment is directed upward from the front end of the main plate portion 2 a to the front end side of the main plate portion 2 a of the first protective cover 2. A bent plate portion 2e bent at a substantially right angle is formed, a fixing bracket 91 fixed to the front surface 2g of the bent plate portion 2e, a wiper 92 made of an elastic material bonded to the fixing bracket 91, The lip portion side sheet (low friction resistance resin sheet of the present invention) 93 adhered to the wiper 92 and a plurality of set screws 94 for fixing the fixing fitting 91 to the main plate portion 2a.

  The wiper assembly 54B constituting the third embodiment is different from the wiper assembly 54 or 54A constituting the first embodiment or the second embodiment as shown in FIG. The bent plate portion 2e is formed on the distal end side of the main plate portion 2a of the protective cover 2, and the base end portion of the lip portion side sheet 93 shown in FIG. The point is different in that a trunk side sheet corresponding to the trunk side sheet 75 or 85 constituting the first embodiment or the second embodiment is not arranged.

  Among these differences, regarding the point that the base end portion of the lip portion side sheet 93 is bonded without being embedded in the wiper 92, the shape of the base end portion 92n of the wiper 92 described later is changed. A recess corresponding to the recess 82m shown in FIG. 4 can be formed. Further, regarding the point that the trunk side sheet corresponding to the trunk side sheet 75 or 85 constituting the first embodiment or the second embodiment is not disposed, a base end portion 92n of the wiper 92 described later is provided. The sheet corresponding to the trunk side sheet 75 or 85 is adhered to the base end portion, or an elastic member (not shown) is attached to the lower surface portion 2d of the first protective cover 2 shown in FIG. The sheet corresponding to the body side sheet 75 or 85 can be bonded to the lower surface of the elastic member.

  Among the components of the wiper assembly 54B, the shape of the fixing metal 91 is substantially the same as the length in the direction orthogonal to the expansion / contraction direction of the main plate portion 3a of the second protective cover 3 shown in FIG. 5 is a cross-sectional view of the base end portion 91i having a right side surface 91j substantially perpendicular to the main plate portion 3a of the second protective cover 3 and a lower side of the base end portion 91i. Inclined to the lower left and bent, and formed with an inclined portion 91b having an opposing surface 91f inclined with respect to the main plate portion 3a. The base end portion 91i has a plurality of portions in the length direction. Are formed with a plurality of female screws 91c that are screwed into male screws (not shown) of the set screw 94.

  The right side 91j of the fixing bracket 91 is in contact with the front surface 2g of the first protective cover 2, and is fastened by a plurality of set screws 94 and screw holes 2f of the first protective cover 2. . The shape of the fixing metal 91 is not limited to the shape having the base end portion 91i and the inclined portion 91b. For example, the bending angle of the bent plate portion 2e of the first protective cover 2 is set to an acute angle. The base end portion 91i may be formed on the extension of the inclined portion 91b.

  A wiper 92 made of nitrile butadiene rubber (NBR), which is a synthetic rubber (elastic material), is bonded to the fixing metal 91 by vulcanization adhesion, which will be described later, and is integrally formed. As shown in FIG. 5, the wiper 92 is formed with a base end portion 92n and a lip portion 92b extending from the base end portion 92n so as to be inclined to the lower left in the drawing.

  The wiper 92 has, on its upper side, a first adhesive surface 92c that is bonded to the opposing surface 91f of the fixing bracket 91, a second adhesive surface 92e that is bonded to the front end surface 91g of the fixing bracket 91, and a fixing bracket. 91 and a third adhesive surface 92f that is bonded to the downward curved portion of the right side surface 91j, and is integrally bonded to the fixture 91. In addition, the 1st adhesion surface which comprises this invention is the said 1st adhesion surface 92c, and the 2nd adhesion surface which comprises this invention is the said 2nd adhesion surface 92e.

  Further, as shown in FIG. 5, the lip portion 92b of the wiper 92 is formed in a conical shape that is thinned from the base end portion 92n side toward the tip end side. Further, the lip portion 92b of the wiper 92 has a concave surface 92h at a position on the lower surface side of the lip portion 92b from the thinnest tip portion 92g toward the upper right in the figure on the base end portion 92n side. A lip portion side sheet (low friction resistance resin sheet) made of polytetrafluoroethylene (PTFE), which is a fluororesin, is formed on the concave surface 92h. 93 is integrally bonded by vulcanization bonding described later. The adhesive surface to which the lip portion side sheet 93 is bonded is not necessarily provided with a concave portion like the concave surface 92h, and may be the same surface as the base end side lower surface 92p.

  In the first main plate-side wiper assembly 54B constituting the third embodiment, as shown in FIG. 5, the wiper 92 is bonded to the fixing metal 91, and the fixing metal 91 is used as the first protective cover 2. The lower surface (reference numeral is omitted) of the lip portion side sheet 93 adhered to the lower surface side of the wiper 92 in the state of being fastened to the front surface 2g of the main plate portion 2a by the set screw 94, The first protective cover 2 is disposed so as to partially overlap the front end side of the main plate portion 2a, and is always in sliding contact with the main plate portion 3a of the other protective cover 3 that is relatively moved.

  Therefore, in the first main plate-side wiper assembly 54B, the lip portion-side sheet 93 bonded to the lower surface side of the wiper 92 slides with the main plate portion 3a of the second protective cover 3 that moves relatively. Therefore, by repeating the telescopic operation of the telescopic cover 1, even if metal debris, dust, coolant liquid or the like adheres to the main plate portion 3a of the second protective cover 3, it adheres to the lower surface side of the wiper 92. It is possible to prevent the metal scrap, dust, coolant liquid and the like from being discharged by the lower surface of the lip portion side sheet 93 and entering the movable portion of the machine tool or the like.

  In addition, as a vulcanization adhesion method for adhering each of the fixing metal 91, the wiper 92, and the lip portion side sheet 93, it can be adhered in the same manner as in the first embodiment. In addition, the fluororesin polytetrafluoroethylene (PTFE), which is the material of the lip portion side sheet 93, is excellent in releasability but has non-adhesiveness. It is preferable that a plate-like unvulcanized rubber is pasted on the adhesive surface of the lip portion side sheet 93 in advance before the vulcanization adhesion.

  The first main plate-side wiper assembly 54B constituting the third embodiment is configured as described above, but is another wiper assembly, which is the first protection shown in FIG. 1 or FIG. Left side plate side wiper assembly 55, right side plate side wiper assembly 56 fixed to cover 2, main plate side wiper assembly 57, left side plate side wiper assembly 58, right side plate side wiper assembly 59 fixed to second protective cover 3, The main plate-side wiper assembly 60, the left-side plate-side wiper assembly 61, and the right-side plate-side wiper assembly 62 fixed to the third protective cover 4 have the same configuration except for the length.

  As described above, the telescopic cover 1 according to the first to third embodiments is attached to the fixing brackets 71, 81, or 91 shown in FIGS. 3 to 5 constituting the wiper assemblies 54 (54A or 54B) to 62, respectively. The wipers 72, 82, or 92 are bonded to each other, and the fixing brackets 71, 81, or 91 are fixed to the protective covers 2 to 4 shown in FIG. 1 or 2, respectively. Since it is not fixed by screwing in a state sandwiched between the protective covers 2 to 4 by the fixing brackets 71, 81 or 91 as in the conventional telescopic cover (see FIGS. 3 to 5). (Even if each lip portion side sheet 73, 83 or 93 shown is not adhered) The wiper 72, 82, or 92 contracts or deteriorates due to a load transmitted from the sliding contact portion to the screwing portion due to the sliding operation or the like, so that the mounting state becomes unstable, and the wiper 72 , 82 or 92 can be prevented from rattling or falling off.

  Further, since each lip portion side sheet 73, 83 or 93, which is a low friction resistance resin sheet, is adhered to each wiper 72, 82 or 92, respectively, when each protective cover 2 to 5 expands or contracts. The lip portions 72b, 82b and 92b of the wipers 72, 82 or 92, which are elastic materials, slide through the lip portion side sheets 73, 83 or 93, respectively, without sliding directly on the sliding surface. Therefore, the sliding frictional force (sliding frictional resistance) generated at the sliding part can be reduced.

  Further, each wiper 72, 82 or 92 is bonded to each wiper 72, 82 or 92 and each fixing bracket 71, 81 or 91, and between each lip portion side sheet 73, 83 or 93 and the wiper 72, 82 or 92. Since the adhesion is a vulcanization adhesion that adheres to each fixing bracket 71, 81 or 91 and each lip portion side sheet 73, 83 or 93 simultaneously with the rubber molding of the wiper 72, 82 or 92, By the coupling, each wiper 72, 82 or 92 is adhered to each fixing bracket 71, 81 or 91 and each lip portion side sheet 73, 83 or 93 by a strong adhesive force, and each wiper 72, 82 or 92 is fixed to each other. Prevents the lip portion side sheets 73, 83, or 93 from being detached from the wipers 72, 82, or 92 by falling off the metal fittings 71, 81, or 91 Door can be.

  In the above embodiment, the main plate portions 2a, 3a, 4a, and 5a of the protective covers 2, 3, 4, and 5 are arranged as top plates, and the telescopic cover 1 that expands and contracts in the horizontal direction has been described. However, the present invention is not limited to this, and the main plate portions 2a, 3a, 4a, and 5a are arranged as a left or right plate shape, and a telescopic cover that expands and contracts in the horizontal direction can also be extracted. Further, the telescopic cover is not limited to the horizontal direction, and the telescopic cover can be similarly applied to the case where the telescopic cover extends and contracts in the vertical direction.

  Moreover, in the said embodiment, although the raw material of each wiper 72, 82, or 92 demonstrated by the nitrile butadiene rubber (NBR) which is a synthetic rubber (elastic material), this invention is not limited to this. Natural rubber, hydrogenated nitrile rubber (HNBR), which is the same synthetic rubber as in the above embodiment, ester-bonded polyester urethane rubber (AU), ether-linked polyether urethane rubber (EU), etc. Either can be applied.

  Moreover, in the said embodiment, polytetrafluoroethylene (PTFE) which is a fluororesin is used as a material for the lip side sheets 73, 83, 93 and the body side sheets 75, 85 as low friction resistance resin sheets. Although described, the present invention is not limited to this, and is also a fluororesin such as tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene / hexafluoropropylene copolymer (FEP), Any of polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene-ethylene copolymer (ETFE), polyvinylidene fluoride (PVDF), aliphatic polyamide (nylon), aromatic polyamide, polyester, etc. The resin sheet can be used , Having a small friction coefficient are preferred. Of the above, polytetrafluoroethylene (PTFE), which is a fluororesin, has a low dynamic friction coefficient of 0.10, which is preferable because of its excellent heat resistance, chemical resistance, and impact resistance.

  In the above-described embodiment, as a manner of attaching the telescopic cover 1 to a machine tool (not shown), the rear plate 8 on the base end side of the first protective cover 2 is fixed to a machine tool body (not shown). On the other hand, the fourth protective cover 5 has been described as a member that is fixed to a processing head (not shown) in which the front plate portion 12 on the front end side moves forward and backward. The front plate portion 12 of the fourth protective cover 5 may be fixed to a machine tool main body (not shown), and the rear plate portion 8 of the first protective cover 2 may be fixed to a processing head (not shown).

It is a perspective view of the back surface side of the telescopic cover which concerns on embodiment of this invention. It is AA arrow sectional drawing of the telescopic cover shown in FIG. It is sectional drawing of the wiper assembly which comprises 1st Embodiment, (a) shows the state in which the pressing force is not loaded on the wiper, (b) shows the state in which the pressing force is loaded on the wiper. Show. It is sectional drawing of the wiper assembly which comprises 2nd Embodiment, Comprising: The state where the pressing force is not loaded to the wiper is shown. It is sectional drawing of the wiper assembly which comprises 3rd Embodiment, Comprising: The pressing force is not loaded on the wiper. It is a fragmentary sectional view of the conventional telescopic cover, Comprising: The pressing force is not loaded on the wiper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Telescopic cover 2,3,4,5 1st thru | or 4th protective cover 2a, 3a, 4a, 5a Main board part 2d Lower surface part 51,52,53 1st thru | or 3rd wiper assembly 54,54A, 54B 1st Main plate side wiper assembly 71, 81, 91 Fixing bracket 71a, 81a Parallel part 71b, 81b, 91b Inclined part 71e, 81e Parallel opposing surface 71f, 81f, 91f Inclining opposing surface 72, 82, 92 Wiper 72a, 82a Portions 72b, 82b, 92b Lip portions 72c, 82c, 92c First adhesive surfaces 72d, 82d, 92e Second adhesive surfaces 72e, 82e, 92f Third adhesive surfaces 72h, 92h Concave surfaces 72j, 82j Lip portion side lower surface 73 Lip side sheet (low friction resistance resin sheet)
75 Torso side sheet

Claims (5)

It is a telescopic cover in which a plurality of protective covers each including a main plate portion and side plate portions formed on both sides of the main plate portion are arranged in a nested manner, and the entire protective cover is extendable. And
At the front end side of each protective cover excluding the innermost protective cover among the plurality of protective covers,
A fixing bracket fixed to the protective cover;
While having a lip portion that is always slidably contacted to the outer surface of the main plate portion or the side plate portion of another protective cover that is disposed so as to partially overlap the front end side of the protective cover to which the fixed fitting is fixed, A wiper molded from an elastic material;
A telescopic cover characterized by comprising: The fixing bracket has a facing surface that faces the outer surface of the main plate portion or the side plate portion of the other protective cover in parallel or inclined, and a tip surface that intersects the facing surface,
2. The telescopic cover according to claim 1, wherein the wiper has a first adhesive surface bonded to the facing surface and a second adhesive surface bonded to the tip surface.   The low-friction-resistance resin sheet is bonded to the lip portion of the wiper at least at a portion that is always in sliding contact with the outer surface of the main plate portion or the side plate portion of the other protective cover. One of the telescopic covers. The low frictional resistance resin sheet is bonded to the lip portion at least at the lip portion of the wiper and the tip side that is always in sliding contact with the outer surface of the main plate portion or the side plate portion of the other protective cover is exposed to the outside. 4. The telescopic cover according to claim 3, wherein the base end side is bonded while being embedded in the wiper. The wiper is made of rubber, and the adhesion between the wiper and the fixing metal and the adhesion between the low friction resistance resin sheet and the wiper are all vulcanized adhesion. Any of the telescopic covers described.