Belt tensioning device

Abstract

The range of a belt to be tensioned is expanded. The belt tensioning device (10) is provided with a clamping mechanism (22) and a reciprocating mechanism. The clamping mechanism (22) pulls the belt along with the reciprocating motion. The reciprocating mechanism reciprocates the clamping mechanism (22). The clamping mechanism (22) has a chuck base (90) and a pressing jig (92). The chuck base (90) has a pair of forming walls (110) and a tape support portion (112). The pair of forming walls (110) forms an entry path (122) for the belt. The tape support section (112) is connected to the pair of forming walls (110) so as to straddle the pair of forming walls (110). The belt support section (112) has an inclined facing surface (170). The inclined facing surface (170) faces the entry path (122). The inclined facing surface (170) is inclined. The pressing jig (92) slidably presses the tape against an inclined facing surface (170) in the chuck base (90).

Description

Technical Field

[0001] The invention relates to a belt tensioning device. Background Art

[0002] Patent document 1 discloses a belt tensioning device. The belt tensioning device has a clamping mechanism, a reciprocating mechanism and a return suppression mechanism. The clamping mechanism pulls the belt as it reciprocates in a specified direction. The reciprocating mechanism causes the clamping mechanism to reciprocate in a specified direction. The return suppression mechanism suppresses the return of the belt pulled by the clamping mechanism. The clamping mechanism has a chuck base and a clamp. The chuck base slides in a specified direction. The clamp repeatedly pushes and releases the belt toward the chuck base as the chuck base reciprocates. The chuck base has a pair of forming walls and a platform. The pair of forming walls form an entry path for the belt. The platform is connected to the pair of forming walls in a manner spanning the pair of forming walls. The clamp repeatedly pushes and releases the platform in the chuck base. A slot is provided on the platform.

[0003] According to the belt tensioner disclosed in Patent Document 1, buckling of the belt can be substantially prevented.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2005-239430 Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, in the invention disclosed in Patent Document 1, there is a problem that the belt to be tightened is restricted to a certain extent.

[0009] An object of the present invention is to expand the range of belts that can be tightened.

[0010] Technical means of solving problems

[0011] The present invention is described with reference to the accompanying drawings. In addition, the reference numerals used in the drawings in this column are intended to help understand the content of the invention. The reference numerals used in the drawings in this column are not intended to limit the content of the invention to the scope of the drawings.

[0012] In order to achieve the above-mentioned object, according to one aspect of the present invention, the belt tensioning device 10 comprises: a housing portion 20 having a sliding surface 72, a clamping mechanism 22 and a reciprocating mechanism 24. The clamping mechanism 22 pulls the belt 500 as it reciprocates along the sliding surface 72. The reciprocating mechanism 24 causes the clamping mechanism 22 to reciprocate along the sliding surface 72. The clamping mechanism 22 comprises a chuck base 90 and a pushing fixture 92. The chuck base 90 is in contact with the sliding surface 72 in a slidable manner. The pushing fixture 92 pushes the belt 500 toward the chuck base 90. The chuck base 90 comprises a pair of forming walls 110, 110 and a belt supporting portion 112. The pair of forming walls 110, 110 respectively comprises a contact surface 130. The contact surface 130 is in contact with the sliding surface 72. The pair of forming walls 110, 110 forms an entry path 122 for the belt 500. The belt support portion 112 is connected to the pair of forming walls 110, 110 in a manner spanning the pair of forming walls 110, 110. The belt support portion 112 has an inclined facing surface 170. The inclined facing surface 170 faces the entry path 122. The inclined facing surface 170 is inclined relative to the contact surface 130 in a manner approaching the contact surface 130 as it approaches the entry port 120 of the belt 500. The pushing jig 92 pushes the belt 500 toward the inclined facing surface 170 in the chuck base 90 in a slidable manner.

[0013] The clamping mechanism 22 pulls the belt 500 as it reciprocates along the sliding surface 72. The reciprocating mechanism 24 causes the clamping mechanism 22 to reciprocate along the sliding surface 72. The clamping mechanism 22 has a chuck base 90. The chuck base 90 has a belt support portion 112. The belt support portion 112 has an inclined facing surface 170. The pushing clamp 92 pushes the belt 500 toward the inclined facing surface 170 in the chuck base 90 in a slidable manner. When the chuck base 90 slides in a direction in which the belt 500 is pulled into the entry path 122, the belt 500 contacts the inclined facing surface 170 and is pulled. By being able to pull the belt 500, restrictions on the belt 500 that is the object of pulling are reduced. As a result, the belt tensioning device 10 of the present invention can expand the range of belts that are the objects of tensioning.

[0014] In addition, preferably, the clamping mechanism 22 further comprises a support body 98. The support body 98 supports the belt 500 at the entrance 120 of the belt 500.

[0015] When the chuck base 90 pulling the belt 500 slides in a manner returning to the original position by the reciprocating mechanism 24, the tension applied to the pulled belt 500 is reduced. In the case described below, the portion of the belt 500 that enters the inside of the entry path 122 is easy to bend inside the entry path 122. This situation refers to the situation where the portion of the belt 500 that does not enter the entrance 120 of the belt 500 lacks movement as its tension decreases. The support body 98 supports the belt 500 at the entrance 120 of the belt 500. Since the belt 500 is supported by the support body 98, even if the portion of the belt 500 that is easy to bend wants to bend, the bending can be suppressed. As a result, the bending of the belt 500 inside the entry path 122 is suppressed.

[0016] In addition, it is preferred that the support body 98 has a belt support surface 190. The belt support surface 190 faces the inlet 120 of the belt 500.

[0017] When the belt support surface 190 faces the entrance 120 of the belt 500, the portion of the belt 500 that is easy to bend is supported by the belt support surface 190. When the portion of the belt 500 that is easy to bend is supported by the belt support surface 190, the region where the bending is suppressed in the portion that is easy to bend becomes larger than when it is supported by a sharp belt, for example. As a result, the bending of the belt 500 inside the entrance path 122 can be further suppressed.

[0018] In addition, preferably, the belt supporting surface 190 and the inclined facing surface 170 extend in directions intersecting with each other.

[0019] The belt support surface 190 and the inclined facing surface 170 extend in directions that intersect each other. Thus, unlike the reduction in the above-mentioned tension, the belt 500 bends near the entrance 120 of the belt 500. In the case where this bend exists, the tension applied to the pulled belt 500 is reduced, and the possibility that the portion of the belt 500 that temporarily enters the inside of the entry path 122 returns to the outside of the chuck base 90 again becomes lower than in the case where this bend does not exist. In addition, the pushing jig 92 pushes the belt 500 toward the inclined facing surface 170 in the chuck base 90 in a slidable manner. Thus, the possibility that the portion of the belt 500 that temporarily enters the inside of the entry path 122 slides on the inclined facing surface 170 and passes through the entry path 122 becomes higher. Since this possibility becomes higher, the bending of the belt 500 inside the entry path 122 can be further suppressed.

[0020] In addition, the belt support portion 112 preferably has a belt inclined path 172 in addition to the inclined facing surface 170. The belt inclined path 172 is inclined relative to the contact surface 130 so as to be away from the contact surface 130 as it approaches the entrance 120 of the belt 500. In this case, the belt inclined path 172 preferably connects the entrance 120 of the belt 500 and the inclined facing surface 170.

[0021] The inlet 120 and the inclined facing surface 170 are connected by the belt inclined path 172, so that the inclination of the inclined facing surface 170 relative to the contact surface 130 becomes larger than when the belt support portion 112 does not have the belt inclined path 172. When the inclination becomes larger, the belt 500 entering the inlet path 122 is strongly pulled. As a result, the belt tensioning device 10 of the present invention can increase the force for pulling the belt 500.

[0022] Effects of the Invention

[0023] The present invention can expand the range of belts that can be tightened. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a first external view of the belt tensioner according to one embodiment of the present invention.

[0025] Figure 2 This is a second external view of the belt tensioner according to the embodiment of the present invention.

[0026] Figure 3 This is a diagram showing the interior of a belt tensioner according to an embodiment of the present invention.

[0027] Figure 4 This is a first external view of a casing according to an embodiment of the present invention.

[0028] Figure 5 This is a second external view of the casing according to one embodiment of the present invention.

[0029] Figure 6 This is an external view of a housing body according to one embodiment of the present invention.

[0030] Figure 7 This is a diagram showing the vicinity of a sliding surface in a housing body according to one embodiment of the present invention.

[0031] Figure 8 It is a diagram showing the structure of a clamping mechanism according to one embodiment of the present invention.

[0032] Fig. 9 This is a cross-sectional view of a clamping mechanism according to one embodiment of the present invention.

[0033] Fig.10This is a first external view of a chuck base according to one embodiment of the present invention.

[0034] Fig.11 This is a second external view of the chuck base according to one embodiment of the present invention.

[0035] Fig.12 This is an external view of a pressing jig according to one embodiment of the present invention.

[0036] Fig.13 This is an appearance diagram of an elastic guide according to one embodiment of the present invention.

[0037] Fig.14 This is an external view of a support body according to one embodiment of the present invention.

[0038] Fig.15 It is a diagram showing the structure of a reciprocating mechanism according to one embodiment of the present invention.

[0039] Fig.16 It is a diagram showing a passage formed in a manifold according to one embodiment of the present invention.

[0040] Fig.17 It is a diagram showing the structure of a return suppression mechanism according to one embodiment of the present invention.

[0041] Fig.18 It is a perspective view of a return suppression jig and a jig pressing rod according to one embodiment of the present invention.

[0042] Fig.19 It is a cross-sectional view of a return suppression mechanism according to one embodiment of the present invention.

[0043] Fig. 20 It is a diagram showing the structure of a cutting mechanism according to one embodiment of the present invention.

[0044] Fig.21 This is a diagram showing air compressors included in a belt tensioner according to an embodiment of the present invention and their connection relationship.

[0045] Fig. 22 This is a cross-sectional view of the clamping mechanism when the belt is pulled according to one embodiment of the present invention. DETAILED DESCRIPTION

[0046] Hereinafter, the embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same components are marked with the same reference numerals. Their names and functions are the same. Therefore, their detailed description will not be repeated.

[0047] [Structure with tensioning device]

[0048] Figure 1This is a first external view of the belt tensioner 10 according to the present embodiment. Figure 2 This is a second external view of the belt tensioner 10 according to the present embodiment. Figure 3 1 is a diagram showing the interior of the belt tensioner 10 according to the present embodiment. Figures 1 to 3 , the structure of the belt tensioner 10 according to the present embodiment will be described.

[0049] The belt tensioner 10 of this embodiment is a device for tensioning the belt 500. The belt tensioner 10 of this embodiment includes a housing 20, a clamping mechanism 22, a reciprocating mechanism 24, a return suppression mechanism 26, an adjuster 28, a cutting mechanism 30, and a holding arm 32.

[0050] The housing 20 accommodates various components of the belt tensioner 10 of the present embodiment. The specific structure of the housing 20 of the present embodiment will be described later.

[0051] The clamping mechanism 22 clamps the belt 500 and pulls the belt 500. The specific structure of the clamping mechanism 22 of this embodiment will be described later.

[0052] The reciprocating mechanism 24 reciprocates the clamping mechanism 22. The specific structure of the reciprocating mechanism 24 of this embodiment will be described later.

[0053] The return suppression mechanism 26 suppresses the return of the belt 500 pulled by the clamp mechanism 22. The specific structure of the return suppression mechanism 26 of this embodiment will be described later.

[0054] The regulator 28 is connected to an air introduction joint (not shown). The regulator 28 adjusts the pressure of air supplied from an air introduction source (not shown) through the air introduction joint to a predetermined pressure.

[0055] The cutting mechanism 30 cuts the tape 500. The specific structure of the cutting mechanism 30 of this embodiment will be described later.

[0056] The holding arm 32 is fixed to the housing 20. The user of the belt tensioner 10 of the present embodiment passes his or her hand between the housing 20 and the holding arm 32. Thus, the belt tensioner 10 is held.

[0057] Figure 4 This is a first external view of the casing 20 according to the present embodiment. Figure 5 This is a second external view of the casing 20 according to the present embodiment. Figure 6 It is an external view of the case body 50 of this embodiment. Figure 7 This is a diagram of the vicinity of the sliding surface 72 in the housing body 50 of this embodiment. Figures 4 to 7 , the structure of the shell portion 20 of the present embodiment will be described.

[0058] The housing portion 20 of the present embodiment includes a housing body 50 , a first housing cover 52 , a second housing cover 54 , and a chuck cover 56 .

[0059] The housing body 50 of this embodiment is formed by connecting two parts. The housing body 50 of this embodiment has a housing portion 70, a sliding surface 72, and a return suppression mechanism fixing portion 74. The housing portion 70 accommodates the clamping mechanism 22, the reciprocating mechanism 24, a part of the return suppression mechanism 26, the regulator 28, and a part of the cutting mechanism 30. The sliding surface 72 serves as a passage for reciprocating the clamping mechanism 22. Another part of the return suppression mechanism 26 is fixed to the return suppression mechanism fixing portion 74.

[0060] The first housing cover 52 covers one side surface of the housing body 50. The second housing cover 54 covers the other side surface of the housing body 50. In the present embodiment, the holding arm 32 is fixed to the second housing cover 54 in the housing portion 20.

[0061] The chuck cover 56 is fixed to the housing body 50 so as to cover the sliding surface 72 .

[0062] Figure 8 It is a figure which shows the structure of the clamping mechanism 22 of this embodiment. Fig. 9 It is a cross-sectional view of the clamping mechanism 22 of this embodiment. Fig.10 This is a first external view of the chuck base 90 according to the present embodiment. Fig.11 This is a second external view of the chuck base 90 according to the present embodiment. Fig.12 It is an external view of the pressing jig 92 of this embodiment. Fig.13 This is an appearance diagram of the elastic guide 96 according to the present embodiment. Fig.14 : is an external view of the support body 98 of this embodiment. Figures 8 to 14 , the structures of the clamping mechanism 22 and the reciprocating mechanism 24 of this embodiment are described.

[0063] The clamping mechanism 22 of the present embodiment includes a chuck base 90 , a pressing jig 92 , a pair of holding elastic bodies 94 , 94 , an elastic body guide 96 , a support body 98 , and a pair of support body fixing pins 100 , 100 .

[0064] The chuck base 90 is slidably in contact with the sliding surface 72. The pushing jig 92 pushes the belt 500 toward the chuck base 90. At this time, the belt 500 is pushed in a slidable manner. The holding elastic body 94 pushes the pushing jig 92. In the case of this embodiment, the holding elastic body 94 is composed of a well-known coil spring. The elastic body guide 96 limits the direction in which the holding elastic body 94 expands and contracts. The support body 98 supports the belt 500. The support body fixing pin 100 fixes the support body 98 to the chuck base 90.

[0065] The chuck base 90 of the present embodiment has a pair of forming walls 110, 110, a belt support portion 112, and a belt entry prevention portion 114. The pair of forming walls 110, 110 form an entry port 120 and an entry path 122 for the belt 500. The belt support portion 112 is connected to the pair of forming walls 110, 110 in a manner spanning the pair of forming walls 110, 110. The belt entry prevention portion 114 is connected to the pair of forming walls 110, 110 in a manner connecting them to each other. The pair of forming walls 110, 110, the belt support portion 112, and the belt entry prevention portion 114 of the present embodiment are integrated.

[0066] The forming wall 110 of the present embodiment includes a contact surface 130 , a long hole forming portion 132 , a connecting pin through-hole forming portion 134 , and a supporting body fixing pin through-hole forming portion 136 .

[0067] The contact surface 130 contacts the sliding surface 72. The long hole 150 and the guide through hole 152 are formed in the long hole forming portion 132. In the case of the present embodiment, the long holes 150, 150 respectively opened in the long hole forming portion 132 of a pair of forming walls 110, 110 face each other. These long holes 150, 150 are inclined relative to the contact surface 130. These long holes 150, 150 are inclined in a manner of moving away from the contact surface 130 as they approach the entrance 120 of the belt 500. The pushing clamp 92 of the present embodiment slidably penetrates both sides of the long holes 150, 150. In the case of the present embodiment, the guide through holes 152, 152 respectively opened in the pair of forming walls 110, 110 also face each other. The elastic body guide 96 penetrates these guide through holes 152, 152. Grooves are formed at both ends of the elastic body guide 96. The retaining elastic body 94 is arranged in the groove and the long hole 150. A connection pin through-hole 154 is formed in the connection pin through-hole forming portion 134 . A support body fixing pin through-hole 156 is formed in the support body fixing pin through-hole forming portion 136 .

[0068] The belt support portion 112 of the present embodiment has an inclined facing surface 170 and a belt inclined path 172. The inclined facing surface 170 faces the entry path 122 of the belt 500. The inclined facing surface 170 is inclined relative to the contact surface 130 in a manner that approaches the contact surface 130 as it approaches the entry port 120 of the belt 500. The belt inclined path 172 is inclined relative to the contact surface 130 in a manner that moves away from the contact surface 130 as it approaches the entry port 120 of the belt 500. In the case of the present embodiment, the belt inclined path 172 connects the entry port 120 of the belt 500 and the inclined facing surface 170.

[0069] The support body 98 of the present embodiment includes a belt support surface 190 and a support surface fixing portion 192 .

[0070] The belt support surface 190 of the present embodiment is a plane facing the inlet 120 of the belt 500. Thus, the support body 98 of the present embodiment supports the belt 500 at the inlet 120 of the belt 500. In the case of the present embodiment, the belt support surface 190 has a region protruding from the inlet 120 of the belt 500 to the outside of the chuck base 90. In addition, in the case of the present embodiment, the belt support surface 190 extends along the contact surface 130 forming the wall 110. As a result, in the case of the present embodiment, the belt support surface 190 and the inclined facing surface 170 extend in directions intersecting with each other.

[0071] The support surface fixing portion 192 fixes the belt support surface 190 to the chuck base 90. In the case of the present embodiment, holes for the support body fixing pins 100, 100 to pass through are formed in the support surface fixing portion 192. The belt support surface 190 is fixed to a pair of forming walls 110, 110 in the chuck base 90 by the support body fixing pins 100, 100 passing through these holes and the support body fixing pin through holes 156, 156 of the belt support portion 112.

[0072] Fig.15 It is a diagram showing the structure of the reciprocating mechanism 24 of this embodiment. Fig.16 2 is a diagram showing passages formed in the manifold 210 of this embodiment. Fig.15 and Fig.16 , the structure of the reciprocating mechanism 24 of this embodiment is described.

[0073] The reciprocating mechanism 24 of this embodiment includes a manifold 210, a reciprocating mechanism directional control valve 212, a speed controller 214, a clamping mechanism driving actuator 216, a switch rod directional control valve 218, a starting directional control valve 220, a drive switching pin 222, a reciprocating connecting rod 224, a reciprocating connecting rod swing center pin 226, and a clamping mechanism connecting pin 228. Fig.15 They are not shown in the figure, but they are connected to each other by known pipes. The following describes how they are connected.

[0074] The manifold 210 is connected to the regulator 28. The manifold 210 forms six passages as described below. The first passage is an air passage 310 between the regulator 28 and the reciprocating mechanism directional control valve 212. Fig.16The air passage 310 is connected to the regulator 28 by a known joint and a pipe (not shown) connected to the air passage 310. The second passage is an air passage 312 between the directional control valve 212 for the reciprocating mechanism and the actuator 216 for driving the clamping mechanism. The third passage is another air passage 314 between the directional control valve 212 for the reciprocating mechanism and the actuator 216 for driving the clamping mechanism. The fourth passage is branched from the other air passage 314 between the directional control valve 212 for the reciprocating mechanism and the actuator 216 for driving the clamping mechanism. In the following description, the passage is referred to as a branch passage 316. The branch passage 316 is used in Fig.16 The known joint and the pipe (not shown) connected to the branch passage 316 are connected to the speed controller 214. The fifth passage is an exhaust passage 350 connected to the reciprocating direction control valve 212. The sixth passage is another exhaust passage 352 connected to the reciprocating direction control valve 212.

[0075] The reciprocating mechanism directional control valve 212 is connected to the regulator 28, the speed controller 214, and the clamping mechanism driving actuator 216 via the manifold 210. The reciprocating mechanism directional control valve 212 is also connected to the switch-lever directional control valve 218 and the starting directional control valve 220. The reciprocating mechanism directional control valve 212 switches the passage of air supplied from the regulator 28 and supplied to the clamping mechanism driving actuator 216 according to the air supplied from the switch-lever directional control valve 218.

[0076] The speed controller 214 is connected to the reciprocating mechanism directional control valve 212 and the clamping mechanism driving actuator 216 via a branch passage 316. In addition, the speed controller 214 is connected to the cutting mechanism 30 via an air passage 340 for cooperating the reciprocating mechanism 24 and the cutting mechanism 30 described later. More specifically, as described later, the speed controller 214 is connected to the cutting mechanism directional control valve 280 in the cutting mechanism 30. The speed controller 214 supplies air to the cutting mechanism directional control valve 280.

[0077] The clamping mechanism driving actuator 216 is connected to the reciprocating mechanism directional control valve 212 via the manifold 210. The clamping mechanism driving actuator 216 drives the reciprocating link 224. The clamping mechanism driving actuator 216 of the present embodiment is realized by a well-known air cylinder.

[0078] The switch-lever directional control valve 218 is connected to the reciprocating directional control valve 212 and the starting directional control valve 220. The switch-lever directional control valve 218 controls the reciprocating directional control valve 212 by supplying air. The switch-lever directional control valve 218 of this embodiment includes a switching valve body 240, a first switch lever 242, and a second switch lever 244. The switching valve body 240 is directly connected to the starting directional control valve 220 and the reciprocating directional control valve 212. When the first switch lever 242 is pushed by the drive switching pin 222, the air path in the switching valve body 240 is changed. As a result, air supplied from an air introduction source (not shown) flows to the starting directional control valve 220. When the second switch lever 244 is pushed by the drive switching pin 222, the air path in the switching valve body 240 is changed. As a result, air supplied from an air introduction source (not shown) flows to the starting directional control valve 212 without passing through the starting directional control valve 220. The structure of the switching valve body 240 for such an operation is well known, and therefore, a detailed description thereof will not be repeated here. In addition, the stroke of the clamping mechanism driving actuator 216 of the present embodiment is such that after the first switch rod 242 changes the air path in the switching valve body 240, the first switch rod 242 is not continuously pushed. In addition, the stroke of the clamping mechanism driving actuator 216 of the present embodiment is such that after the second switch rod 244 changes the air path in the switching valve body 240, the second switch rod 244 is not continuously pushed. Thus, damage to the first switch rod 242 and the second switch rod 244 is prevented.

[0079] The starting directional control valve 220 is connected to the switch-lever directional control valve 218 and the reciprocating mechanism directional control valve 212. The starting directional control valve 220 of the present embodiment includes a start button 250 and a start valve body 252. The start button 250 transmits the force received by itself to the start valve body 252. When the force is transmitted from the start button 250, the start valve body 252 opens the air passage 322 described below. The air passage 322 is the air passage 322 of the starting directional control valve 220 between the reciprocating mechanism directional control valve 212 and the switch-lever directional control valve 218. When the force is not transmitted from the start button 250, the start valve body 252 closes the air passage 322.

[0080] The drive switching pin 222 connects the clamp mechanism driving actuator 216 and the reciprocating link 224. Furthermore, the drive switching pin 222 presses the first switch lever 242 and the second switch lever 244 of the switch lever-equipped directional control valve 218.

[0081] The reciprocating link 224 transmits the power supplied from the clamping mechanism driving actuator 216 to the clamping mechanism 22 .

[0082] The reciprocating link oscillating center pin 226 oscillates and fixes the reciprocating link 224. Thus, the reciprocating link 224 oscillates with the power supplied by the clamp mechanism driving actuator 216. In addition, the reciprocating link oscillating center pin 226 itself is fixed to the housing portion 70 of the housing body 50.

[0083] The clamping mechanism connecting pin 228 connects the reciprocating connecting rod 224 to a pair of forming walls 110, 110 of the chuck base 90. In the case of the present embodiment, the clamping mechanism connecting pin 228 penetrates the connecting pin through holes 154, 154 of the chuck base 90. Furthermore, the clamping mechanism connecting pin 228 is embedded in the groove at one end of the reciprocating connecting rod 224. Thus, as the reciprocating connecting rod 224 swings, the clamping mechanism 22 is driven to reciprocate.

[0084] Fig.17 It is a diagram showing the structure of the return suppression mechanism 26 according to the present embodiment. Fig.18 It is a perspective view of the return suppression jig 262 and the jig pressing rod 264 according to the present embodiment. Fig.19 2 is a cross-sectional view of the return suppression mechanism 26 according to the present embodiment. Figures 17 to 19 , the structure of the return suppression mechanism 26 of this embodiment is described.

[0085] The return suppression mechanism 26 of the present embodiment includes a lock base 260 , a return suppression jig 262 , a jig pressing lever 264 , a pressing coil spring 266 , and a lever swing center pin 268 .

[0086] In the case of the present embodiment, the locking base 260 is fixed to the return suppression mechanism fixing portion 74 of the housing body 50. The locking base 260 forms a space in which the return suppression clamp 262 is accommodated and through which the belt 500 passes. A pair of return suppression clamp embedding long holes 270, 270 are formed in the locking base 260. Both ends of the return suppression clamp 262 are embedded in these pair of return suppression clamp embedding long holes 270, 270. When the belt 500 passes through the locking base 260, the return suppression clamp 262 pushes the belt 500 against the inner peripheral surface of the locking base 260. The clamp push rod 264 pushes the return suppression clamp 262. One end of the push coil spring 266 is placed on the spring support plate 76 provided inside the housing body 50. The other end of the push coil spring 266 pushes the clamp push rod 264. The rod swing center pin 268 passes through the locking base 260. The rod swing center pin 268 fixes the clamp pressing rod 264 so that it can swing freely.

[0087] When the other end of the pushing coil spring 266 pushes the jig pushing rod 264, the jig pushing rod 264 swings around the rod swing center pin 268. As described above, the swinging jig pushing rod 264 pushes the return-inhibiting jig 262. Both ends of the pushed return-inhibiting jig 262 are embedded in the return-inhibiting jig embedding long hole 270 formed in the locking base 260. As a result, the pushed return-inhibiting jig 262 is pushed up along the return-inhibiting jig embedding long hole 270. At this time, when the belt 500 passes through the interior of the locking base 260, the pushed return-inhibiting jig 262 pushes the belt 500 toward the inner peripheral surface of the locking base 260.

[0088] Fig. 20 : is a diagram showing the structure of the cutting mechanism 30 of this embodiment. Fig. 20 The structure of the cutting mechanism 30 of this embodiment will be described. Fig. 20 , the cutting mechanism directional control valve 280 and the cutting mechanism driving actuator 282 are connected to each other using a tube for passing air. How to connect them is described below.

[0089] The cutting mechanism 30 of this embodiment has: a directional control valve 280 for the cutting mechanism, an actuator 282 for driving the cutting mechanism, an actuator connecting pin 284, a pair of transmission links 286, 286, a connecting rod connecting pin 288, a swing link 290, a swing center pin 292, a cutter body connecting pin 294, a cutter body 296 and a cutter guide 298.

[0090] The cutting mechanism direction control valve 280 is connected to an air introduction source (not shown), the speed controller 214, and a cutting mechanism driving actuator 282. The cutting mechanism direction control valve 280 controls the direction of the air flow supplied from the air introduction source (not shown). This control is implemented based on the air supplied from the speed controller 214.

[0091] The cutting mechanism driving actuator 282 supplies power for reciprocating the cutter body 296. The cutting mechanism driving actuator 282 is driven by air supplied from an air inlet source not shown. The direction of the air flow is controlled by the cutting mechanism directional control valve 280. In the present embodiment, the cutting mechanism driving actuator 282 is a known actuator driven by air.

[0092] The actuator connecting pin 284 connects the cutting mechanism driving actuator 282 and the pair of transmission links 286 , 286 .

[0093] The pair of transmission links 286 , 286 transmits the power supplied from the cutting mechanism driving actuator 282 to the swing link 290 .

[0094] The link connecting pin 288 connects a pair of transfer links 286 , 286 and a swing link 290 .

[0095] The swing link 290 transmits the power transmitted from the pair of transmission links 286 , 286 to the cutter body 296 .

[0096] The swing center pin 292 passes through a hole formed in the lock base 260. Thus, the swing center pin 292 is fixed to the return suppression mechanism 26. The swing center pin 292 swingably fixes the swing link 290. Thus, the swing link 290 swings according to the power supplied by the cutting mechanism driving actuator 282.

[0097] The cutter body connecting pin 294 connects the swing link 290 and the cutter body 296 .

[0098] When the cutter body 296 is pushed up by the swing link 290 and pressed toward the belt 500 , the belt 500 is cut.

[0099] The cutter guide 298 is fixed to the locking base 260. A recessed portion (not shown) is formed in the cutter guide 298. The cutter body 296 can be raised and lowered in a state of being inserted into the recessed portion. Thus, the cutter guide 298 restricts the moving direction of the cutter body 296 pushed up by the swing link 290. As a result, the cutter body 296 moves up and down according to the action of the swing link 290.

[0100] [Manufacturing method of belt tensioning device]

[0101] The belt tensioner 10 of the present embodiment is manufactured by mutually connecting the components constituting the belt tensioner 10. The method of manufacturing these components is well known per se, and therefore will not be described in detail here.

[0102] When these components are connected to each other, the clamping mechanism 22 is connected in the following steps. First, the push jig 92 is made to penetrate the guide through holes 152, 152 of the chuck base 90. Next, the push jig 92 is moved toward the long holes 150, 150. When the push jig 92 moves toward the long holes 150, 150, the elastic body guide 96 is made to penetrate the guide through holes 152, 152. When the elastic body guide 96 penetrates the guide through holes 152, 152, the elastic body 94 is retained and embedded in the grooves and long holes 150, 150 formed at both ends of the elastic body guide 96. Next, the support body fixing pins 100, 100 respectively penetrate the support body fixing pin through hole forming portions 136, 136 of the forming wall 110 of the chuck base 90. At this time, these support body fixing pins 100, 100 also pass through the holes of the support surface fixing portion 192 of the support body 98 which are arranged in advance between the pair of forming walls 110, 110. Thus, the clamping mechanism 22 of the present embodiment is completed.

[0103] [How to use the belt tensioner]

[0104] Fig.21 1 is a diagram showing the air compressors included in the belt tensioner 10 of the present embodiment and their connection relationship. Figures 1 to 21 A method of using the belt tensioner 10 according to the present embodiment will be described.

[0105] When air is supplied to the belt tensioning device 10 of the present embodiment from an air inlet source not shown in the figure, a part of the air is delivered to the regulator 28. Another part of the air is delivered to the directional control valve 218 with a switch rod. Still another part of the air is delivered to the directional control valve 280 for the cutting mechanism. The regulator 28 supplied with air adjusts the pressure of the air to a prescribed pressure. The air is supplied to the directional control valve 212 for the reciprocating mechanism. The air is supplied from the regulator 28 to the directional control valve 212 for the reciprocating mechanism via the air passage 310 therebetween. The air is supplied from the air inlet source not shown in the figure to the directional control valve 218 with a switch rod via the air passage 320 therebetween. The air is supplied from the air inlet source not shown in the figure to the directional control valve 280 for the cutting mechanism via the air passage 330 therebetween.

[0106] The air supplied to the reciprocating mechanism directional control valve 212 is supplied to the clamping mechanism driving actuator 216. Here, the air passes through another air passage 314 between the reciprocating mechanism directional control valve 212 and the clamping mechanism driving actuator 216. When the air is supplied in this way, the clamping mechanism driving actuator 216 pulls the reciprocating link 224.

[0107] The air supplied to the cutting mechanism directional control valve 280 is supplied to the cutting mechanism driving actuator 282. Here, the air passes through the air passage 332 between the cutting mechanism directional control valve 280 and the vicinity of the piston through-portion of the cylinder of the cutting mechanism driving actuator 282. At this time, in the air passage 334 between the cutting mechanism directional control valve 280 and the vicinity of the bottom of the cylinder of the cutting mechanism driving actuator 282, the air flows from the cutting mechanism driving actuator 282 to the cutting mechanism directional control valve 280. The air is discharged to the atmosphere via the cutting mechanism directional control valve 280. Thus, the piston of the cutting mechanism driving actuator 282 is accommodated in the cylinder.

[0108] The belt 500 is wound around a member in advance. The member around which the belt 500 is wound is not shown. When the front end of the belt 500 is tightened, the member around which the belt 500 is wound is restrained by the belt 500. The operator places the front end of the belt 500 on the cutter guide 298 of the belt tensioning device 10 of the present embodiment. However, when the front end of the belt 500 is placed, the operator directly pushes the front end of the belt 500 into the inside of the belt tensioning device 10 of the present embodiment. As a result, the front end of the belt 500 passes through the locking base 260. The front end of the belt 500 that has passed through the locking base 260 passes through the entry port 120 formed in the chuck base 90. The front end of the belt 500 that has passed through the entry port 120 passes through the entry path 122. The belt entry prevention portion 114 prevents the front end of the belt 500 that has passed through the entry path 122 from entering the inside of the belt tensioning device 10 of the present embodiment. As a result, the front end of the belt 500 that has passed through the entry path 122 protrudes out of the belt tensioner 10 of the present embodiment.

[0109] Next, the operator presses the start button 250 of the belt tensioner 10 of the present embodiment. When the start button 250 is pressed, the starter valve body 252 of the starter directional control valve 220 opens. As described above, air is supplied from the air introduction source (not shown) to the switch-lever directional control valve 218. Thus, when the starter valve body 252 of the starter directional control valve 220 opens, air is supplied from the switch-lever directional control valve 218 to the reciprocating mechanism directional control valve 212. The air passes through the air passage 322 between the reciprocating mechanism directional control valve 212 and the switch-lever directional control valve 218 and through the starter directional control valve 220. When air is supplied from the switch-lever directional control valve 218 to the reciprocating mechanism directional control valve 212, the flow of air supplied from the reciprocating mechanism directional control valve 212 to the clamping mechanism driving actuator 216 changes. The reciprocating mechanism directional control valve 212 changes the flow of air in this way. Thus, air flows from the reciprocating mechanism directional control valve 212 to the clamping mechanism driving actuator 216. The air passes through one air passage 312 between the reciprocating mechanism directional control valve 212 and the clamping mechanism driving actuator 216. Air flows from the clamping mechanism driving actuator 216 to the reciprocating mechanism directional control valve 212. The air passes through another air passage 314 between the reciprocating mechanism directional control valve 212 and the clamping mechanism driving actuator 216. As a result, the clamping mechanism driving actuator 216 pushes the reciprocating connecting rod 224.

[0110] The reciprocating link 224 is fixed to the reciprocating link swing center pin 226 so as to be swingable. Thus, the reciprocating link 224 is swung by being pressed by the clamping mechanism driving actuator 216. The reciprocating link 224 is connected to the chuck base 90 via the clamping mechanism connecting pin 228. The reciprocating link 224 is connected to the chuck base 90, so the chuck base 90 is pulled by the reciprocating link 224. The chuck base 90 pulled by the reciprocating link 224 slides on the sliding surface 72.

[0111] Fig. 22 2 is a cross-sectional view of the clamping mechanism 22 when the belt 500 is pulled. When the chuck base 90 slides on the sliding surface 72, the belt 500 passing through the chuck base 90 is pulled by the chuck base 90. Thus, the clamping mechanism 22 pulls the belt 500 as it reciprocates along the sliding surface 72.

[0112] Then, the drive switching pin 222 attached to the clamping mechanism driving actuator 216 pushes the second switch rod 244 of the switch rod directional control valve 218. When the drive switching pin 222 pushes the second switch rod 244 of the switch rod directional control valve 218, the flow of air in the switch rod directional control valve 218 changes. As a result, the supply of air in the air passage 322 of the starter directional control valve 220 between the reciprocating mechanism directional control valve 212 and the switch rod directional control valve 218 is cut off. The air from the switch rod directional control valve 218 is supplied through the air passage 324 of the starter directional control valve 220 that does not pass through the reciprocating mechanism directional control valve 212 and the switch rod directional control valve 218. When the air is supplied in this way, the reciprocating mechanism directional control valve 212 changes the flow of air supplied to the clamping mechanism driving actuator 216. As a result, the air is discharged from the clamping mechanism driving actuator 216 to the reciprocating mechanism directional control valve 212. The air passes through one air passage 312 between the reciprocating mechanism directional control valve 212 and the clamping mechanism driving actuator 216. The air exhausted to the reciprocating mechanism directional control valve 212 is exhausted to the atmosphere. On the other hand, air is supplied from the reciprocating mechanism directional control valve 212 to the clamping mechanism driving actuator 216. The air passes through another air passage 314 between the reciprocating mechanism directional control valve 212 and the clamping mechanism driving actuator 216. When the air is supplied in this way, the clamping mechanism driving actuator 216 pulls the reciprocating connecting rod 224.

[0113] As described above, since the reciprocating connecting rod 224 is connected to the chuck base 90, when the clamping mechanism driving actuator 216 pulls the reciprocating connecting rod 224, the chuck base 90 is pushed by the reciprocating connecting rod 224. Fig. 22As shown by the double-dashed line in the figure, the pressed chuck base 90 slides on the sliding surface 72 and approaches the locking base 260. The support body 98 enters the locking base 260. When the chuck base 90 approaches the locking base 260, the tension applied to the belt 500 passing through the chuck base 90 decreases. Fig. 22 As shown by the two-dot chain line, the return prevention jig 262 of the return prevention mechanism 26 presses the belt 500 toward the inner peripheral surface of the lock base 260. Thus, the belt 500 that has temporarily passed through the lock base 260 is prevented from returning to the lock base 260.

[0114] As described above, at this time, the return clamp 262 is suppressed from pushing the belt 500 toward the inner peripheral surface of the locking base 260. The tension applied to the belt 500 that passes through the entry path 122 in the chuck base 90 becomes smaller. As a result, the belt 500 is easily loosened near the entry port 120 of the chuck base 90. The belt 500 that is loosened near the entry port 120 of the chuck base 90 is supported by the belt support surface 190 of the support body 98. The belt 500 supported by the belt support surface 190 receives a reaction force from the belt support surface 190 and enters the entry path 122. The entered belt 500 is pushed out from the entry path 122.

[0115] Then, the drive switching pin 222 attached to the clamping mechanism driving actuator 216 pushes the first switch rod 242 of the switch rod directional control valve 218. When the drive switching pin 222 pushes the first switch rod 242 of the switch rod directional control valve 218, the flow of air in the switch rod directional control valve 218 changes. As a result, the supply of air to the air passage 322 of the starting directional control valve 220 between the reciprocating mechanism directional control valve 212 and the switch rod directional control valve 218 is restarted. The supply of air to the air passage 324 of the starting directional control valve 220 that does not pass through the reciprocating mechanism directional control valve 212 and the switch rod directional control valve 218 is cut off. When the air is supplied in this way, the reciprocating mechanism directional control valve 212 changes the flow of air supplied to the clamping mechanism driving actuator 216. As a result, the air is discharged from the clamping mechanism driving actuator 216 to the reciprocating mechanism directional control valve 212. The air passes through another air passage 314 between the reciprocating mechanism directional control valve 212 and the clamping mechanism driving actuator 216. The air exhausted to the reciprocating mechanism directional control valve 212 is exhausted to the atmosphere. On the other hand, air is supplied from the reciprocating mechanism directional control valve 212 to the clamping mechanism driving actuator 216. The air passes through an air passage 312 between the reciprocating mechanism directional control valve 212 and the clamping mechanism driving actuator 216. As a result, the clamping mechanism driving actuator 216 pushes the reciprocating connecting rod 224. Hereinafter, the pulling of the belt 500 and the pushing of the belt 500 from the entry path 122 are repeated in the same manner. As a result, the reciprocating mechanism 24 causes the clamping mechanism 22 to reciprocate along the sliding surface 72.

[0116] Then, when the belt 500 is sufficiently pulled, the clamping mechanism driving actuator 216 no longer pushes out the reciprocating link 224. After the clamping mechanism driving actuator 216 no longer pushes out the reciprocating link 224, air is also exhausted from another air passage 314 between the reciprocating mechanism directional control valve 212 and the clamping mechanism driving actuator 216. By this exhaustion, air is also exhausted from the branch passage 316 and the air passage 340 for making the reciprocating mechanism 24 cooperate with the cutting mechanism 30.

[0117] When the air is discharged in this way, the cutting mechanism directional control valve 280 changes the flow of air supplied to the cutting mechanism driving actuator 282. Thus, the air supplied from the cutting mechanism directional control valve 280 to the cutting mechanism driving actuator 282 passes through the air passage 334 between the cutting mechanism directional control valve 280 and the vicinity of the bottom of the cylinder of the cutting mechanism driving actuator 282. The air is discharged from the air passage 332 between the cutting mechanism directional control valve 280 and the vicinity of the piston through-portion of the cylinder of the cutting mechanism driving actuator 282. The air is discharged into the atmosphere through the cutting mechanism directional control valve 280.

[0118] As a result, the cutting mechanism driving actuator 282 pushes the pair of transmission links 286, 286. The pair of transmission links 286, 286 transmits the power supplied from the cutting mechanism driving actuator 282 to the swing link 290. The swing link 290 transmits the power transmitted from the pair of transmission links 286, 286 to the cutter body 296. When the cutter body 296 is pushed up by the swing link 290 and pressed against the belt 500, the belt 500 is cut.

[0119] When the tape 500 is cut, the operator releases his hand from the start button 250. As a result, the supply of air in the air passage 322 of the start directional control valve 220 between the reciprocating mechanism directional control valve 212 and the switch rod directional control valve 218 is stopped. At this time, the clamping mechanism driving actuator 216 is in the process of pushing the reciprocating connecting rod 224. Therefore, the clamping mechanism driving actuator 216 continues to operate. Then, when the drive switching pin 222 pushes the second switch rod 244 of the switch rod directional control valve 218, the flow of air in the switch rod directional control valve 218 changes. As a result, the clamping mechanism driving actuator 216 pulls the reciprocating connecting rod 224. As a result, air is supplied to the clamping mechanism driving actuator 216 via another air passage 314 between the reciprocating mechanism directional control valve 212 and the clamping mechanism driving actuator 216.

[0120] Along with the supply of the air, air is also supplied to the branch passage 316 and the air passage 340 for making the reciprocating mechanism 24 cooperate with the cutting mechanism 30. When there is the supply of the air, the cutting mechanism directional control valve 280 changes the flow of air to the cutting mechanism driving actuator 282. When the flow of air changes, in the air passage 332 between the cutting mechanism directional control valve 280 and the vicinity of the piston through-portion of the cylinder body of the cutting mechanism driving actuator 282, the air flows from the cutting mechanism directional control valve 280 to the cutting mechanism driving actuator 282. In the air passage 334 between the cutting mechanism directional control valve 280 and the vicinity of the bottom of the cylinder body of the cutting mechanism driving actuator 282, the air flows from the cutting mechanism driving actuator 282 to the cutting mechanism directional control valve 280. The air is discharged to the atmosphere via the cutting mechanism directional control valve 280. Thus, the piston of the cutting mechanism driving actuator 282 is accommodated in the cylinder body.

[0121] Then, the switching pin 222 is driven to push the first switch rod 242 of the switch rod directional control valve 218. As a result, the supply of air in the air passage 324 that does not pass through the starting directional control valve 220 between the reciprocating mechanism directional control valve 212 and the switch rod directional control valve 218 is cut off. At this time, the starting directional control valve 220 is closed. Therefore, the supply of air in the air passage 322 that passes through the starting directional control valve 220 between the reciprocating mechanism directional control valve 212 and the switch rod directional control valve 218 remains stopped. As a result, the new belt 500 can be tightened.

[0122] [Effects of the belt tensioner of this embodiment]

[0123] The belt tensioning device 10 of this embodiment pulls the belt 500 in contact with the inclined facing surface 170. Thus, unlike, for example, a case where a slot is provided in the belt support portion 112 and the belt 500 is inserted into the slot and pulled, the limitation of pulling only the belt 500 inserted into the slot is reduced. Since this limitation is reduced, the range of the belt 500 to be tightened can be expanded.

[0124] Furthermore, the belt tensioner 10 of the present embodiment can suppress bending of the belt 500 inside the entry path 122 .

[0125] Furthermore, the belt tensioner 10 of the present embodiment can increase the force for pulling the belt 500 .

[0126] [Description of Modifications]

[0127] The embodiments disclosed this time are illustrative in all aspects. The scope of the present invention is not limited by the above-mentioned embodiments. Of course, various design changes can be made within the scope that does not depart from the gist of the present invention.

[0128] For example, the form of the support body 98 is not particularly limited. Therefore, the portion of the support body 98 that directly contacts and supports the belt 500 may not be a plane. When the support body 98 has a belt support surface 190, the extending direction of the belt support surface 190 is not particularly limited.

[0129] In addition, the holding arm 32 may also be fixed to the first housing cover 52 instead of the second housing cover 54 .

[0130] Description of Reference Numerals

[0131] 10: With tensioning device

[0132] 20: Shell

[0133] 22: Clamping mechanism

[0134] 24: Reciprocating mechanism

[0135] 26: Inhibit return mechanism

[0136] 28: Regulator

[0137] 30: Cutting mechanism

[0138] 32: Holding arm

[0139] 50: Shell body

[0140] 52: First housing cover

[0141] 54: Second housing cover

[0142] 56: Chuck cover

[0143] 70: Accommodation

[0144] 72: Sliding surface

[0145] 74: Return suppression mechanism fixing part

[0146] 76: Spring support plate

[0147] 90: Chuck base

[0148] 92: Push clamp

[0149] 94: Keep elastic

[0150] 96: Elastomer guide

[0151] 98: Support

[0152] 100: Support body fixing pin

[0153] 110: Forming a wall

[0154] 112: With support part

[0155] 114: Belt entry prevention unit

[0156] 120: Entrance

[0157] 122: Enter the path

[0158] 130: Contact surface

[0159] 132: Long hole forming portion

[0160] 134: Connecting pin through hole forming portion

[0161] 136: Support body fixing pin through-hole forming portion

[0162] 150: Long hole

[0163] 152: Guide through hole

[0164] 154: Connecting pin through hole

[0165] 156: Support body fixing pin through hole

[0166] 170: Inclined facing surfaces

[0167] 172: With inclined path

[0168] 190: With support surface

[0169] 192: Support surface fixing part

[0170] 210: Manifold

[0171] 212: Directional control valve for reciprocating mechanism

[0172] 214: Speed ​​Controller

[0173] 216: Actuator for driving the clamping mechanism

[0174] 218: Directional control valve with switch lever

[0175] 220: Directional control valve for starting

[0176] 222: Drive switching pin

[0177] 224: Reciprocating connecting rod

[0178] 226: Reciprocating connecting rod swing center pin

[0179] 228: Clamping mechanism connecting pin

[0180] 240: Switching valve body

[0181] 242: First switch lever

[0182] 244: Second switch lever

[0183] 250: Start button

[0184] 252: Starter valve body

[0185] 260: Lock base

[0186] 262: Suppress return fixture

[0187] 264: Clamp push rod

[0188] 266: Pushing coil spring

[0189] 268: Rod swing center pin

[0190] 270: Suppress the return fixture embedded in the long hole

[0191] 280: Directional control valve for cutting mechanism

[0192] 282: Actuator for driving cutting mechanism

[0193] 284: Actuator connecting pin

[0194] 286: Transfer connecting rod

[0195] 288: Connecting rod pin

[0196] 290: Swing link

[0197] 292: Swing center pin

[0198] 294: Cutter body connecting pin

[0199] 296: Cutter body

[0200] 298: Cutter guide

[0201] 500: belt

Claims

1. A belt tensioning device, characterized in that: have: A housing portion having a sliding surface; a clamping mechanism that pulls the belt as it reciprocates along the sliding surface; and A reciprocating mechanism causes the clamping mechanism to reciprocate along the sliding surface; The clamping mechanism comprises: a chuck base capable of slidably contacting the sliding surface; as well as A pushing fixture pushes the belt toward the chuck base; The chuck base has: a pair of forming walls, each having a contact surface that contacts the sliding surface and forming an entry path for the belt; as well as a belt support portion connected to the pair of forming walls in a manner spanning the pair of forming walls; The belt support portion has an inclined facing surface, the inclined facing surface facing the entry path and inclined relative to the contact surface so as to approach the contact surface as approaching the belt entry port. The pressing jig presses the belt toward the inclined facing surface of the chuck base in a slidable manner.

2. The belt tensioning device according to claim 1, characterized in that: The clamping mechanism also has a support body that supports the belt at the belt entry port.

3. The belt tensioning device according to claim 2, characterized in that: The support body has a belt supporting surface facing the belt inlet.

4. The belt tensioning device according to claim 3, characterized in that: The belt supporting surface and the inclined facing surface extend in directions intersecting each other.

5. The belt tensioning device according to claim 1, characterized in that: The belt support portion has a belt inclined path in addition to the inclined facing surface, and the belt inclined path is inclined relative to the contact surface so as to be away from the contact surface as approaching the belt inlet. The belt inclined path connects the belt inlet and the inclined facing surface.

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