Chain vice device and band saw equipped with it

Abstract

To provide a chain vise device that can stably fix a workpiece irrespective of a shape and a dimension and can be made compact, and a band saw including the chain vise device.SOLUTION: A chain vise device 10 for stretching a chain 16 across a workpiece WK includes: a base part 24 in which a chain 16 is stored, the base part 24 including a placement part 14 in which the workpiece WK is placed; a chain guide 54 and a chain stopper 60 arranged in the base part 24 for fixing the chain 16 in one side of the placement part 14; and a hook 48 arranged in the base part 24 for fixing the chain 16 in the other side of the placement part 14.SELECTED DRAWING: Figure 3A

Description

[Technical Field]

[0001] The present invention relates to a chain vise device and a band saw equipped with the same. [Background technology]

[0002] Patent Document 1 discloses a chain vise device that secures a workpiece (workpiece) such as a pipe by winding a chain around it and tightening it. In a chain vise device in which one end of the chain is fixed to a base and then stretched over the workpiece, securing a small workpiece can be difficult because the other end of the chain is in the way. Furthermore, the chain can be thrown to the ground and become dirty. For this reason, the chain vise device described in Patent Document 1 has one end of the chain fixed to a base and a rotatable vise shaft with a pulley, worm wheel, and screw holder for winding the chain. Furthermore, a spiral spring fixed to the base is attached to one end of the vise shaft, generating a rotational force that winds up the chain. The other end of the chain is attached to a chain handle and secured by hooking it onto a chain hook located on the base.

[0003] However, in the chain vise device described in Patent Document 1, the range of motion of the chain hook is limited, so as the workpiece becomes smaller, the force pulling the chain also decreases, and the force with which the chain handle is hooked onto the chain hook also decreases. Furthermore, to prevent excess chain slack at one end of the chain and ensure that the pulley can wind up a long length, the pulley must be made large. As a result, the space below the base becomes larger, necessitating a larger base, which increases the weight of the chain vise device. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-193029 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a chain vise device that can stably fix a workpiece regardless of its shape or size and that can be configured compactly, and a band saw equipped with the same. [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided a chain vise device for hanging a chain on a workpiece, the chain vise device having a mounting portion for placing the workpiece and comprising: a base portion in which the chain is housed; a first fixing member disposed on the base portion and fixing the chain on one side of the mounting portion; and a second fixing member disposed on the base portion and fixing the chain on the other side of the mounting portion.

[0007] Furthermore, according to another aspect of the present invention, the device may include a support shaft extending along the width direction of the base portion and having both ends fixed to both sides of the base portion in the width direction, a fixing arm having a cylindrical shape and formed integrally with a rotating shaft that is rotatable relative to the support shaft arranged inside, and extending along the radial direction of the rotating shaft, and a biasing mechanism for rotating the fixing arm, and the first fixing member and the second fixing member may be configured to be rotatable relative to the support shaft in conjunction with the rotation of the fixing arm.

[0008] According to another aspect of the present invention, the device may include a chain guide that is arranged on one side of the mounting portion and engages with the chain to guide the chain in and out of the base portion, and the first fixing member may be configured to be able to engage the chain guide by being rotated toward the chain guide in conjunction with the rotation of the fixing arm.

[0009] Furthermore, according to another aspect of the present invention, the second fixing member may be configured to be able to engage a fixed end formed at the end of the chain that is pulled out from the base portion by rotating in conjunction with the rotation of the fixing arm.

[0010] According to another aspect of the present invention, a constant force spring may be disposed in the base portion, and the end of the chain inside the base portion may be connected to the constant force spring.

[0011] Furthermore, according to another aspect of the present invention, the chain may be a single piece, and may be provided with a chain grip that can be held at the end of the chain that is pulled out from the base portion.

[0012] According to another aspect of the present invention, a band saw may include the chain vise device according to the present invention. [Effects of the Invention]

[0013] In the chain vise device according to the present invention, the chain wound around the workpiece is fixed on one side of the mounting section by a first fixing member and on the other side of the mounting section by a second fixing member. This allows the workpiece to be stably fixed regardless of the size of the workpiece placed on the mounting section. Furthermore, since the chain only needs to be long enough to be wound around the workpiece, the storage space for the chain in the base section can be made compact. This allows the chain vise device with the base section to be configured compactly.

[0014] According to another aspect of the present invention, the first and second fixing members are configured to be rotatable relative to the support shaft in conjunction with the rotation of the fixing arm. The fixing arm can be rotated by a biasing mechanism. This allows the first and second fixing members to centrally fix and release the chain, ensuring stable fixation of the workpiece. Furthermore, since there is no need to provide a separate biasing mechanism for rotating the first and second fixing members, the chain vise device can be configured compactly.

[0015] According to another aspect of the present invention, the first fixing member is configured to rotate toward the chain guide in conjunction with the rotation of the fixing arm, thereby engaging the chain guide that guides the chain into and out of the base portion, and to fix the chain on one side of the mounting portion, thereby enabling the workpiece to be stably fixed.

[0016] Furthermore, according to another aspect of the present invention, the second fixing member is configured to rotate in conjunction with the rotation of the fixing arm, thereby locking the fixed end formed on the end of the chain and fixing the chain on the other side of the mounting part, thereby enabling the workpiece to be stably fixed.

[0017] According to another aspect of the present invention, the end of the chain inside the base is connected to the tip of the constant force spring. Therefore, after the workpiece is secured, the excess part of the chain can be pulled back inside the base. This allows the workpiece to be secured stably. Furthermore, because the chain is connected to the tip of the constant force spring, the chain does not retract. This allows the space inside the base to be compact.

[0018] According to another aspect of the present invention, the chain is a single piece, and the end of the chain pulled out from the base portion is provided with a grippable chain grip. This allows the base portion for accommodating the chain to be made compact, and the chain grip can be formed compactly. This allows the chain vise device to be configured compactly.

[0019] According to another aspect of the present invention, a band saw is provided with the chain vise device of the present invention, which allows a workpiece to be stably fixed regardless of its shape or size, and can be configured compactly.

[0020] From the above, the chain vise device and the band saw equipped with the same according to the present invention can stably fix the workpiece regardless of its shape or size, and can be configured compactly. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a perspective view of a band saw equipped with a chain vise device according to this embodiment. [Figure 2] FIG. 2 is a perspective view of the chain vise device according to this embodiment. [Figure 3A] FIG. 3A shows a perspective view of the chain vice mechanism according to this embodiment. [Figure 3B] FIG. 3B shows a side view of the chain vice mechanism according to this embodiment. [Figure 3C] FIG. 3C shows a side view of the chain vice mechanism according to this embodiment with the chain stretched over it. [Figure 3D] FIG. 3D shows a bottom perspective view of the chain vise mechanism according to this embodiment. [Figure 4] FIG. 4 shows an enlarged perspective view of the first fixing member according to this embodiment. [Figure 5] FIG. 5 shows an enlarged perspective view of the second fixing member according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0022] A chain vice device and a band saw equipped with a chain vice device according to this embodiment will be described below with reference to the accompanying drawings. Similar or corresponding elements are designated by the same reference numerals, and duplicate explanations will be omitted. For ease of understanding, the scale of the drawings may be changed. Furthermore, the chain vice device and band saw shown in the accompanying drawings are merely examples, and chain vice devices and band saws of different dimensions may be formed.

[0023] FIG. 1 shows a perspective view of a band saw 12 equipped with a chain vice device 10 according to this embodiment. FIG. 2 shows a perspective view of the chain vice device 10 according to this embodiment. The band saw 12 is a device for cutting a workpiece (workpiece WK), such as a bar or pipe, placed on a mounting portion 14 of the chain vice device 10. The chain vice device 10 also hangs a chain 16 across the upper surface of the workpiece WK placed on the mounting portion 14 to secure the workpiece WK. In the figure, arrows also indicate the longitudinal direction (front-to-rear direction) of the chain vice device 10, which is the cutting direction of the workpiece WK, the lateral direction (width direction) of the chain vice device 10, which is the direction in which the workpiece WK is placed, and the up-down direction of the chain vice device 10. In the figure, FR indicates the front side of the device, W indicates the width direction of the device, and UP indicates the upper side of the device.

[0024] The band saw 12 is configured to rotate a band saw blade 20 suspended on a pulley (not shown) arranged inside a frame portion 18 using a motor (not shown). The band saw 12 equipped with a chain vice device 10 is installed on a horizontal surface such as the floor. The workpiece WK is placed on a mounting portion 14 of the chain vice device 10 and secured by a single chain 16. The secured workpiece WK is cut by lowering the frame portion 18 from above the workpiece WK. Specifically, the band saw blade 20, which rotates due to the rotation of the pulley inside the frame portion 18, continues to cut the workpiece WK as it descends. The band saw 12 is configured to automatically switch off when cutting is complete.

[0025] The chain vise device 10 according to this embodiment includes a vise mechanism 22 for suspending the chain 16 over the workpiece WK, a base 24 that forms a housing that houses the vise mechanism 22 and is installed on the floor or the like, a power plug 26 for supplying power to the motor (not shown) of the band saw 12, and a switch 28 for turning on / off the operation of the band saw 12. The base 24 also has legs 30 for attaching bolts or the like (not shown) for fixing the base 24 to the floor or the like when the base 24 is installed on the floor or the like.

[0026] A V-shaped mounting portion 14, as viewed from the side, is formed along the width direction of the device on the upper part of the base portion 24. The workpiece WK is placed along the mounting portion 14 and can be cut at a cutting position CP where the band saw blade 20 of the band saw 12 descends.

[0027] 3A to 3D show only the vise mechanism 22. As shown in FIG. 3A, a constant force spring 32 is disposed on the lower and front side of the base unit 24 (vice mechanism 22). The constant force spring 32 is a long leaf spring wound with a constant curvature and is fixed inside the base unit 24 by a mounting pin 34. As shown in FIG. 3B, the chain 16 is connected to the constant force spring 32 by connecting a chain joint 36 connected to the end of the chain 16 on the lower side of the device with a plate member 32A provided at the tip of the constant force spring 32. The constant force spring 32 is normally wound in a roll. When the chain 16 is pulled toward the mounting unit 14, the constant force spring 32 is pulled out in conjunction with this. When the chain 16 is released (no longer pulled), the constant force spring 32 automatically rewinds. At this time, the rewinding force is constant regardless of the length of the pulled leaf spring.

[0028] The chain 16 connected to the constant force spring 32 extends toward the rear of the device along the longitudinal direction of the base portion 24 (the front-to-rear direction of the device), and is guided toward the upper side of the device via a chain roller 38 that is arranged on the lower and rear side of the device of the base portion 24 and is rotatable around a roller support shaft 38A that is arranged along the width direction of the device.

[0029] As shown in Fig. 3C, a leaf chain is used as the chain 16. The chain 16 is formed in a chain shape by alternately overlapping inner plates 16A and outer plates 16B connected by link pins 16C. Note that in the following description, a leaf chain is used as the chain 16, but this is not limiting and a chain other than a leaf chain may also be used.

[0030] Chain collars 40 are attached to the chain 16 to prevent the chain 16 from being excessively pulled out or pulled back from the base portion 24. Two pairs of chain collars 40 are attached to both sides of the chain 16 in the width direction of the device, one at the front side of the device and one at the rear side of the chain guide 54 (described later). The link pin 16C1 between the two pairs of chain collars 40 extends in the width direction of the device (along the width direction of the chain 16) longer than the width of the chain 16. A pair of cylindrical chain collars 40 that can fit into the link pin 16C1 are attached to both ends of the link pin 16C1. The chain collars 40 are sized to catch on the chain guide 54 and cannot pass through it. Therefore, when the chain 16 is pulled back into the base portion 24, the chain collar 40 on the front side of the device catches on the chain guide 54, preventing the chain 16 from returning too far toward the base portion 24. Furthermore, when the chain 16 is pulled out to the outside of the base portion 24, the chain collar 40 on the rear side of the device is caught on the chain guide 54, preventing the chain 16 from coming out too far from the base portion 24.

[0031] A chain rail 42 is provided on the rear side of the mounting section 14 of the base section 24 to guide the chain 16 being inserted and removed. The chain 16, guided toward the upper side of the base section 24 via the chain rollers 38, is guided toward the mounting section 14 along the chain rail 42 located on the rear side of the mounting section 14. For this reason, the chain rail 42 extends from the mounting section 14 toward the rear side of the device, and a cross section taken along the vertical and width directions of the device is formed into a groove shape that is concave toward the upper side of the device. Furthermore, the width of the grooved portion of the chain rail 42 is approximately the same as the width of the chain 16.

[0032] As shown in FIG. 4, the chain 16 guided by the chain rail 42 is guided (sent out) toward the front of the device by a chain guide 54 that is disposed above and in front of the chain rail 42 and is rotatable about a central axis 52 that is disposed along the width direction of the device. The chain guide 54 is formed in a generally circular plate shape and has an inner plate portion 54A that is disposed above the chain 16 passing through the chain rail 42, and an outer plate portion 54B that is also formed in a generally circular plate shape and is disposed outside the chain rail 42 in the width direction of the device. In the outer periphery of the inner plate portion 54A, recesses 56 for engaging with the chain 16 are formed at equal intervals along the outer periphery of the inner plate portion 54A. Therefore, the recesses 56 are recessed radially outward of the inner plate portion 54A, and their shape is formed to be generally the same as the outer periphery of the link pin 16C1. The intervals between the recesses 56 along the circumferential direction of the chain guide 54 are the same as the intervals between the link pins 16C1 along the chain 16. Therefore, the long link pins 16C1 between the two pairs of chain collars 40 can be fitted into the recesses 56. As a result, the link pins 16C1 fitted into the recesses 56 rotate the chain guide 54 as the chain 16 moves in and out of the base portion 24. A sawtooth gear is formed on the outer periphery of the outer plate portion 54B of the chain guide 54, with teeth and grooves 54B1 alternately formed at equal intervals.

[0033] In the base portion 24, an arm pin 58 formed in a generally rod shape as a support shaft is arranged along the width direction of the device (the width direction of the base portion 24) on the front side and the bottom side of the mounting portion 14. Both ends of the arm pin 58 in the longitudinal direction (the width direction of the device) are fixed to both sides of the base portion 24 in the width direction. Furthermore, a fixing arm 64 is arranged on one side of a rotating shaft 64A formed in a cylindrical shape along the width direction of the device in the longitudinal direction (the width direction of the device) of the rotating shaft 64A. The fixing arm 64 is formed integrally with the rotating shaft 64A and extends along the radial direction of the rotating shaft 64A. Specifically, the arm pin 58 is inserted (passes through) inside the cylindrical rotating shaft 64A, thereby making the fixing arm 64 rotatable relative to the arm pin 58. In addition, on the other side of the rotating shaft 64A in the longitudinal direction (device width direction), a chain stopper 60 serving as a first fixed member extending toward the rear side of the device and toward the device lower side of the chain rail 42 is arranged rotatably relative to an arm pin 58 passed through one end thereof.

[0034] As shown in FIGS. 3B to 3D, the chain stopper 60 extends from the mounting portion 14 toward the rear of the device, and both side portions 60A are positioned outward in the device width direction relative to the chain rail 42. This allows the chain rail 42 to be accommodated between the side portions 60A. Furthermore, the tip end (the end toward the rear of the device) of the side portion 60A is formed with a locking portion 60B that is pointed toward the chain guide 54. The locking portion 60B is formed to have substantially the same shape as the groove 54B1 of the outer plate portion 54B. This allows the outer plate portion 54B of the chain guide 54 to engage with the locking portion 60B of the chain stopper 60, thereby locking the chain guide 54.

[0035] One end of the chain 16, the end above the device, is a grip portion 44, and the grip portion 44 has a fixed end portion 46 formed by extending the link pin 16C1 along the width direction of the chain 16 longer than the width of the chain 16.

[0036] A hook 48 serving as a second fixing member is formed integrally with the rotating shaft 64A of the fixing arm 64 so as to sandwich the chain stopper 60 attached to the rotating shaft 64A from the outside in the width direction of the device. The hook 48 is formed so that both side portions 48A extend further toward the front of the device than the central portion 48B, and can accommodate the chain 16 in the central portion 48B. In addition, the tip portions (portions toward the front of the device) of both side portions 48A are formed with recessed portions 49 that are shaped approximately the same as the outer periphery of the fixed end portion 46 (link pin 16C1) and are engageable with the fixed end portion 46.

[0037] A first torsion spring 62 is attached to the arm pin 58 at a portion of the chain stopper 60 on the inside in the device width direction (between the side portions 60A) in order to bias the chain stopper 60. The arm pin 58 passes through a coil portion 62A of the first torsion spring 62, and the first torsion spring 62 is arranged along the front-to-rear direction of the device. An arm 62B on the front side of the first torsion spring 62 abuts against the lower side of the hook 48, and an arm 62C on the rear side of the device is arranged to abut against the lower side of the chain stopper 60. Therefore, the chain stopper 60 can be rotated in conjunction with the rotation of the hook 48 and the rotating shaft 64A via the first torsion spring 62.

[0038] A chain grip 50 is attached to the end of the chain 16 on the grip portion 44 side. The chain grip 50 is formed compactly so that it can be held with one hand, for example. This makes it easy to insert and remove the chain 16 from the base portion 24, and allows the vise mechanism 22 to be made more compact than when a handle or the like that can be held with both hands is provided.

[0039] As shown in FIG. 5 , the fixing arm 64 is formed in a rod shape extending from the pivot shaft 64A toward the front and bottom of the device, and a spherical seat 66 that opens toward the front of the device is formed along the longitudinal direction. The spherical seat 66 has a cross section cut along the short direction of the fixing arm 64 that is formed in a substantially arc shape. A second torsion spring 70 is disposed on the pivot shaft 64A adjacent to the fixing arm 64. The second torsion spring 70 is disposed with its coil portion 70A passing through the pivot shaft 64A. An arm 70B on the front side of the second torsion spring 70 is disposed along the longitudinal direction of the fixing arm 64, and its tip is fixed to the fixing arm 64. An arm 70C on the rear side of the second torsion spring 70 is restrained by a member (not shown) inside the base portion 24 so as not to be displaced (deformed) toward the rear of the device.

[0040] On the front side of the fixing arm 64, biasing mechanisms 74, 76 are provided for pressing the fixing arm 64 and rotating it about the arm pin 58 to fix the fixing arm 64. Specifically, a substantially cylindrical feed screw holder 72 is disposed, fixed to the base portion 24, and extending downward from the front side of the device to the rear side of the device. A rod-shaped feed screw shaft 74 with a thread formed on its surface is inserted (screwed) into the feed screw holder 72. The feed screw shaft 74 passes through the feed screw holder 72 and extends to the spherical seat portion 66 of the fixing arm 64, and a substantially spherical pivot 78 (universal joint) is formed at its tip end in contact with the spherical seat portion 66 and is rotatable and swingable relative to the spherical seat portion 66.

[0041] As shown in FIG. 5 , a handle 76 is connected to the upper end (front end) of the feed screw shaft 74. A release switch 80 is provided on the upper side of the feed screw holder 72, facing the feed screw shaft 74 on the lower side of the device, with a half nut (not shown) formed thereon. The half nut engages with a threaded portion on the surface of the feed screw shaft 74 to secure the feed screw shaft 74. The release switch 80 is biased by a spring disposed between the release switch 80 and the feed screw holder 72, causing the switch 80 to rotate around a pin inserted into the release switch 80 along the width direction of the device, and the half nut engages with the feed screw shaft 74. This secures the feed screw shaft 74. To secure the fixing arm 64 using the feed screw shaft 74, the user first grasps the handle 76 and pushes the feed screw shaft 74 toward the fixing arm 64 (toward the rear of the device). As the feed screw shaft 74 is pushed in, the release switch 80 rotates around the pin against the spring, temporarily releasing the engagement between the half nut portion and the feed screw shaft 74. This allows the feed screw shaft 74 to be pushed toward the fixing arm 64 (toward the rear of the device). The pushed-in feed screw shaft 74 engages with the half nut portion of the release switch 80, which is biased by the spring, and is fixed in the pushed-in position. Furthermore, from this state, the user can further tighten the handle 76 while maintaining the engagement between the half nut portion and the feed screw shaft 74, thereby pushing the feed screw shaft 74 further toward the fixing arm 64. This allows the feed screw shaft 74 and the pivot 78 at its tip to stably stationary (position) the fixing arm 64. Furthermore, the fixing arm 64, into which the feed screw shaft 74 is pushed, rotates around the arm pin 58 toward the rear of the device, causing the hook 48 to rotate as well. As a result, the fixed end 46 of the chain 16 that engages with the recess 49 of the hook 48 is pulled toward the lower side of the device, and the chain 16 further presses the workpiece WK against the mounting portion 14. This makes it possible to further stabilize the fixation of the workpiece WK by the chain 16.

[0042] To release the fixation (positioning) of the fixing arm 64 by the feed screw shaft 74, the user rotates the handle 76 in the opposite direction to the direction used when initially tightening the handle 76, thereby loosening the retightening of the feed screw shaft 74. Next, when the user presses the release switch 80, the engagement between the half nut portion and the threaded portion of the feed screw shaft 74 is released. As a result, the fixing arm 64, which is no longer pressed into the feed screw shaft 74, is rotated around the arm pin 58 toward the front of the device by the biasing force of the second torsion spring 70 arranged on the rotating shaft 64A. The rotation of the fixing arm 64 pushes (pushes) the feed screw shaft 74 further toward the front of the device. This releases the fixation (positioning) of the fixing arm 64 by the feed screw shaft 74, and the tension (pulling force) of the chain 16 stretched around the workpiece WK is also reduced (relaxed).

[0043] The operation and effect of this embodiment will be described below through an explanation of the procedure for suspending the chain 16 over the workpiece WK.

[0044] First, the user holds the chain grip 50 and pulls out the chain 16 from the base portion 24. At this time, the link pin 16C1 fitted in the recess 56 causes the chain guide 54 to rotate, guiding the chain 16 to the outside of the base portion 24. The constant force spring 32 is also extended in accordance with the length of the chain 16 being pulled out. After the required length of the chain 16 has been pulled out, it is placed across the workpiece WK, as shown in FIG. 3C, and the fixed end 46 of the chain 16 is locked by the hook 48.

[0045] Next, when the handle 76 is pushed toward the fixing arm 64 (rearward of the device), the feed screw shaft 74 is pushed into the spherical seat 66 of the fixing arm 64. As a result, the fixing arm 64 receives a moment force about the pivot shaft 64A and rotates from the front of the device toward the rear of the device. The rotation of the fixing arm 64 rotates the hook 48, and the chain 16 engaged with the hook 48 is pulled toward the bottom of the device. Furthermore, in conjunction with the rotation of the fixing arm 64, the chain stopper 60 attached to the arm pin 58 is biased by the first torsion spring 62 disposed between the hook 48 and the chain stopper 60 and rotates toward the chain guide 54 (upward of the device). The engaging portion 60B of the rotated chain stopper 60 engages with the groove 54B1 in the outer plate 54B of the chain guide 54. This restricts the rotation of the chain guide 54. This also restricts movement (in and out) of the chain 16 engaged with the chain guide 54, and the chain 16 is fixed at the position where it engages with the chain guide 54.

[0046] Furthermore, by rotating the handle 76, the pivot 78 of the feed screw shaft 74 is sent out toward the rear of the device, which pushes the fixing arm 64 further toward the rear of the device and allows the fixing arm 64 to rotate toward the rear of the device around the arm pin 58. This allows the chain 16, which is locked (fixed) by the hook 48 and the chain stopper 60, to be further tightened, and the workpiece WK over which the chain 16 is stretched can be stably fixed.

[0047] When the release switch 80 is pressed while the workpiece WK is fixed, the engagement between the release switch 80 and the feed screw shaft 74 is released, allowing the handle 76 to be pulled out toward the front of the device. When the handle 76 is pulled out toward the front of the device, the fixing arm 64 is no longer pressed by the feed screw shaft 74, and the biasing force of the second torsion spring 70 causes the fixing arm 64 to rotate toward the front of the device around the arm pin 58. This causes the hook 48, which has been engaging the fixed end 46, to rotate toward the upper side of the device around the arm pin 58. Furthermore, the first torsion spring 62 also rotates along with the hook 48, reducing the biasing force on the chain stopper 60, thereby releasing the engagement between the chain stopper 60 and the chain guide 54. When the chain 16 is released, the restoring force (spring force) of the constant force spring 32 guides the chain 16 along the chain rail 42 and the chain guide 54, and the chain 16 is accommodated inside the base portion 24.

[0048] According to the chain vise device 10 of this embodiment, the chain 16 stretched over the workpiece WK is fixed by the chain stopper 60 on the rear side of the mounting portion 14, and by the hook 48 on the front side of the mounting portion 14. This allows the workpiece WK placed on the mounting portion 14 to be stably fixed regardless of its size. Furthermore, since the chain 16 only needs to be long enough to stretch over the workpiece WK, the storage space for the chain 16 in the base portion 24 can be made compact. This allows the chain vise device 10 having the base portion 24 to be configured compactly.

[0049] Furthermore, according to this embodiment, the hook 48 is formed integrally with the pivot shaft 64A of the fixing arm 64, and the chain stopper 60 is configured to move in conjunction with the fixing arm 64 via the first torsion spring 62. Therefore, the chain stopper 60 and the hook 48 can be moved in conjunction with each other by pressing and rotating the fixing arm 64 with the biasing mechanisms 74, 76. This allows the chain 16 to be fixed and released in a unified manner, and the workpiece WK can be stably fixed. Furthermore, since there is no need to provide separate biasing mechanisms for rotating the chain stopper 60 and the hook 48, the chain vise device 10 can be configured compactly.

[0050] Furthermore, according to this embodiment, the chain stopper 60 is configured to lock (lock) the chain 16 on the rear side of the mounting section 14 by locking the chain guide 54 that guides the chain 16 in and out of the base section 24. This allows the workpiece WK to be stably fixed.

[0051] Furthermore, according to this embodiment, the hook 48 is configured to lock the fixed end 46 formed on the grip portion 44 of the chain 16, thereby fixing the chain 16 on the front side of the mounting portion 14. This allows the workpiece WK to be stably fixed.

[0052] Furthermore, in the chain vise device 10 according to this embodiment, a constant force spring 32 is disposed on the device lower side of the base portion 24, and the end portion of the chain 16 on the device lower side is connected to the tip portion (plate material 32A) of the constant force spring 32. As a result, the chain 16 is not wound up, and the space on the device lower side of the base portion 24 can be made compact.

[0053] Furthermore, according to this embodiment, the chain 16 is a single chain, and is provided with a grippable chain grip 50 at the grip portion 44 (end portion). This allows the space for accommodating the chain 16 to be compact, and the chain grip 50 to be formed compactly. This allows the chain vise device 10 to be configured compactly.

[0054] Furthermore, according to this embodiment, the band saw 12 is equipped with the chain vise device 10 according to the present invention. Therefore, the workpiece WK can be stably fixed regardless of its shape or size, and the band saw 12 can be configured compactly.

[0055] From the above, the chain vise device 10 according to this embodiment and the band saw 12 equipped with it can stably fix the workpiece WK regardless of its shape or dimensions, and can be configured compactly.

[0056] Furthermore, in the chain vise device 10 according to this embodiment, the hook 48 and the chain stopper 60 are arranged along the same longitudinal axis of the base portion 24. This allows a uniform force to be applied to the chain 16 stretched across the workpiece WK. This allows the workpiece WK to be stably fixed regardless of the size of the workpiece WK placed on the placement portion 14.

[0057] Furthermore, according to the chain vise device 10 of this embodiment, the chain 16 is a leaf chain, and the fixed end 46 is a link pin 16C1 of the chain 16 that extends in the longitudinal direction to a length greater than the width of the chain 16. Because the link pin 16C1 extends in the width direction, which is perpendicular to the length direction of the chain 16, the chain 16 can be stably fixed by locking the link pin 16C1.

[0058] Only one link pin 16C1 (at one location) on the grip portion 44 side of the chain 16 protrudes in the width direction of the chain 16 further than the other link pins 16C on the grip portion 44 side. This makes it possible to keep the position at which the chain 16 is engaged with the hook 48 constant, and to prevent excess length of the chain 16 when engaged, regardless of the size of the workpiece WK.

[0059] Furthermore, in the chain vise device 10 according to this embodiment, the biasing mechanisms 74, 76 are configured to temporarily fix the feed screw shaft 74 by engaging the half nut portion of the release switch 80 with the feed screw shaft 74 pushed in by the user. The user then rotates the handle 76 to retighten the fastening, stably fixing the fixing arm 64. In this manner, the fixing arm 64 can be easily fixed by the feed screw shaft 74. To release the fixing arm 64, the user releases the retightening and then presses the release switch 80, thereby releasing the engagement between the half nut portion of the release switch 80 and the feed screw shaft 74. The biasing force of the second torsion spring 70 can then push the feed screw shaft 74 back. In this manner, the fixing arm 64 can be easily released from the fixation by the feed screw shaft 74. This allows the workpiece WK placed on the mounting portion 14 to be easily fixed and released.

[0060] Furthermore, according to the chain vice device 10 of this embodiment, the constant force spring 32 has a constant restoring force (spring force) regardless of the length to which it is pulled out, thereby stably inserting and removing the chain 16. Furthermore, because the chain 16 can be inserted and removed using only the constant force spring 32, the number of parts can be reduced and the chain vice device 10 can be configured compactly.

[0061] Although the chain vice device 10 has been described as having one chain 16, the present invention is not limited to this and two or more chains may be provided in the chain vice device.

[0062] Furthermore, although it has been described here that the fixing arm 64 is rotatably attached to the arm pin 58, this is not limited to this, and the fixing arm and the arm pin may be formed integrally, with both ends of the arm pin configured to be rotatable relative to the base portion.

[0063] Although the chain vise device 10 that secures the chain 16 with the chain stopper 60 and the hook 48 and the band saw 12 equipped with the same have been described above, the present invention is not limited to the above-described embodiment. Various modifications of the above-described embodiment are included within the scope of those skilled in the art. [Explanation of symbols]

[0064] 10 Chain vice device 12 Bandsaw 14 Placement section 16 Chain 24 Base 32 Constant force spring 46 Fixed end 48 Hook (second fixing member) 50 Chain Grip 54 Chain guide 58 Arm pin (support shaft) 60 Chain stopper (first fixing member) 64 Fixing arm 64A Rotating shaft 74 Feed screw shaft (biasing mechanism) 76 Handle (biasing mechanism) WK Work

Claims

1. A chain vise device for stretching a chain over a workpiece, a base portion having a placement portion for placing the workpiece and accommodating the chain; a first fixing member disposed on the base portion and configured to fix the chain on one side of the mounting portion; a second fixing member disposed on the base portion and configured to fix the chain on the other side of the mounting portion; a support shaft extending along the width direction of the base portion within the base portion and having both ends fixed to the base portion; a fixing arm having a cylindrical shape, formed integrally with a rotation shaft that is rotatable relative to the support shaft disposed therein, and extending along a radial direction of the rotation shaft; a biasing mechanism for rotating the fixing arm; Equipped with The chain vise device, wherein the first fixing member and the second fixing member are configured to be rotatable relative to the support shaft in conjunction with the rotation of the fixing arm.

2. a chain guide disposed on one side of the mounting portion and engaging with the chain to guide the chain in and out of the base portion; 2. The chain vise device according to claim 1, wherein the first fixing member is configured to be able to lock the chain guide by being rotated toward the chain guide in conjunction with the rotation of the fixing arm.

3. 3. A chain vise device as described in claim 1 or claim 2, wherein the second fixing member is configured to be able to engage a fixed end formed at the end of the chain pulled out from the base portion by rotating in conjunction with the rotation of the fixing arm.

4. 4. The chain vise device according to claim 1, wherein a constant force spring is disposed in the base portion, and an end of the chain inside the base portion is connected to a tip end of the constant force spring.

5. 5. The chain vice device according to claim 1, wherein the chain is a single piece and is provided with a chain grip that can be held at an end of the chain that is pulled out from the base portion.

6. A band saw equipped with a chain vise device described in any one of claims 1 to 5.

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