JP4280461B2 - Band saw machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a band saw machine such as a vertical band saw machine or a horizontal band saw machine for cutting a workpiece.
[0002]
[Prior art]
In general, a band saw machine is a machine that cuts a workpiece in a cutting region by moving a saw blade housing provided with the band saw blade in a cutting direction while circulating and running an endless band saw blade. The saw blade housing is provided with a pair of saw blade guide devices for guiding and supporting the band saw blade so that a tooth tip of an entry portion entering the cutting region of the band saw blade faces the cutting direction side. is there. Here, each saw blade guide device supports a fixed insert that supports one side surface of the body portion of the band saw blade, and supports the other side surface of the body portion of the band saw blade and moves in the opening / closing direction (opening direction, closing direction). Each of the movable movable inserts and an insert cylinder for moving the movable insert in the opening / closing direction are provided.
[0003]
Therefore, the movable insert is moved in the closing direction by the operation of the insert cylinder in each saw blade guide device, and the body portion of the band saw blade is clamped by the cooperation of the movable insert and the fixed insert. Accordingly, the band saw blade is guided and supported by the pair of saw blade guide devices so that the tooth tip of the entry portion faces the cutting direction side. Then, the workpiece is cut by the entry portion of the band saw blade in the cutting region by moving the saw blade housing in the cutting direction while circulating the band saw blade.
[0004]
[Problems to be solved by the invention]
By the way, since the body part of the band saw blade is clamped by a powerful force by the movable insert and the fixed insert in each saw blade guide device, when the band saw blade is circulated, the insert (the movable insert and The friction between the guide surface of the fixed insert) and the body of the band saw blade becomes very large. Therefore, the guide surface of the insert is heavily worn, and it is necessary to frequently replace the insert (including exchanging only a part of the insert), and cause an early breakage in the body of the band saw blade. There is a problem that scratches occur and the life of the band saw blade is shortened. Furthermore, there is a problem in that energy loss due to friction between the guide surface of the insert and the body portion of the band saw blade increases, and the work efficiency of the band saw machine decreases.
[0005]
[Means for Solving the Problems]
In the first aspect of the invention, the saw blade housing provided with the band saw blade is cut in the cutting direction while the endless band saw blade is circulated while being guided and supported by the pair of saw blade guides. A band saw machine that performs a cutting process on a workpiece in a cutting region by moving the workpiece,
Each saw blade guide device
A guide body provided in the saw blade housing;
A fixed insert provided on the guide body and supporting one side of the body of the band saw blade;
A support arm swingably provided on the guide body;
A movable insert that is provided at one end of the support arm, supports the other side of the body of the band saw blade, and is movable in an opening direction and a closing direction;
An insert cylinder having an insert hydraulic chamber and a pistonton movably provided in the insert hydraulic chamber;
A first spring that is provided between the guide body and the support arm and biases the other end of the support arm in a direction of pressing the other end of the support arm against the tip of the piston;
When hydraulic oil is supplied to the insert hydraulic chamber, the support arm swings in one direction to move the movable insert in the closing direction, and when the hydraulic oil in the insert hydraulic chamber is discharged, the first spring is attached. The support arm is configured to swing in the other direction by the force to move the movable insert in the opening direction,
In addition, each cylinder operating means for operating the insert cylinder in each saw blade guide device is provided,
Each cylinder operating means
A main circuit that can be switched between a pump connection state in which one end portion is connected to the insert hydraulic chamber and the other end portion is connected to a pump that pumps hydraulic oil, and a tank connection state that is connected to a tank that stores hydraulic oil,
A hydraulic oil direction regulating means that is disposed in the middle of the main circuit and regulates the flow of hydraulic oil to the opposite side of the insert hydraulic chamber;
A bypass circuit connected to the main circuit so as to straddle the hydraulic oil direction regulating means;
In the middle of this bypass circuit, a case having a discharge chamber connected to the pump side and a return chamber connected to the insert cylinder side,
A discharge piston provided in the discharge chamber so as to be capable of reciprocating in a liquid-tight manner;
A return plunger which is provided in the return chamber so as to be capable of reciprocating in a liquid-tight manner, and is integrally connected to the discharge piston,
When the hydraulic fluid is pumped by the pump when the main circuit is in the pump connected state, the pressure acting area of the discharge piston is set to the return plan so that the discharge piston moves fluid-tightly to the forward stroke end. Configured to be larger than the pressure acting area of the jar,
Furthermore, each cylinder operating means
Provided in the case, so that when the other end of the main circuit is switched from the pump connection state to the tank connection state, the discharge piston returns in a liquid-tight manner to the return stroke end. And a second spring for urging the discharge piston toward the backward stroke end side.
[0006]
Here, "move", in addition to the linear movement, Ru meaning der including swinging.
[0007]
According to the invention specific matter of the first aspect, the hydraulic oil direction regulating means is provided by pumping the hydraulic oil by driving the pump while the other end of the main circuit in each cylinder operating means is in the pump connected state. The hydraulic oil is supplied to the insert hydraulic chamber via. Thus, the movable insert in each saw blade guide device is moved in the closing direction to the clamping position for clamping the body portion of the band saw blade in cooperation with the fixed insert. The band saw blade is guided and supported so that the tooth tip faces the cutting direction.
In addition to supplying hydraulic oil to the insert hydraulic chamber by pumping hydraulic oil by driving the pump with the other end of the main circuit in each saw blade guide device being connected to the pump, the main circuit and Although the hydraulic oil flows into the discharge chamber and the return chamber via the bypass circuit, the hydraulic piston is configured so that the pressure action area of the discharge piston is larger than the pressure action area of the return plunger. Will be supplied. As a result, the discharge piston moves fluid-tightly to the forward stroke end, and the return plunger also moves fluid-tight integrally with the discharge piston.
Further, when the other end portion of the main circuit is switched from the pump connection state to the tank connection state, the discharge piston moves back in a liquid-tight manner to the return stroke end by the urging force of the second spring, and the return plunger Moves backwards in a liquid-tight manner integrally with the discharge piston. As a result, the hydraulic oil in the insert hydraulic chamber can be returned to the return chamber by an amount corresponding to the return movement of the discharge piston, and the movable insert is opened to the clearance forming position that forms a minute clearance with the band saw blade. It can be moved slightly in the direction. The “clearance” dimension means a length obtained by subtracting the thickness of the body portion of the band saw blade from the distance between the support surface of the fixed insert and the support surface of the movable insert.
At this time, the hydraulic oil direction restricting means restricts the hydraulic oil from flowing to the opposite side of the insert hydraulic chamber side, and the return plunger is provided in the return chamber in a liquid-tight manner. The hydraulic oil can be blocked at the portion between the hydraulic chamber and the hydraulic oil direction regulating means and at the insert hydraulic chamber side portion rather than the return plunger in the bypass circuit, and the position of the movable insert can be held at the clearance forming position. .
As described above, the band saw blade is guided and supported by the pair of saw blade guide devices so that the tooth tip of the entry portion faces the cutting direction side while the movable insert is held at the clearance forming position. be able to.
After guiding and supporting the body of the band saw blade by a pair of saw blade guide devices, moving the saw blade housing in the cutting direction while circulating the band saw blade, the entry in the band saw blade in the cutting region Depending on the portion, the workpiece can be cut. Here, since the position of the movable insert is held at the clearance forming position, the friction between the guide surface of the insert and the body portion of the band saw blade is minimized as much as possible while keeping the amount of bending of the band saw blade within an allowable range. Can be reduced .
In the invention according to claim 2 , in addition to the matters specifying the invention according to claim 1, the hydraulic oil direction regulating means regulates the flow of hydraulic oil to the opposite side of the insert hydraulic chamber side. The switching valve can be switched between a direction regulation state and a regulation release state in which hydraulic oil flows to the opposite side.
[0008]
According to subject matter as defined in claim 2, in addition to the action by the subject matter of claim 1, in the case to exchange the band saw blade and the other end the tank connection state of the main circuit The switching valve is switched from the direction restriction state to the restriction release state, and the hydraulic oil in the insert hydraulic chamber is discharged to the tank via the main circuit. Accordingly, the movable insert can be moved in the opening direction to remove the band saw blade from between the fixed insert and the movable insert, and another band saw blade is inserted between the fixed insert and the movable insert. can do.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0010]
FIG. 1 is a view taken along line II in FIG. 2 and also shows cylinder operating means. FIG. 2 is a front view of the saw blade guide device according to the embodiment of the present invention. FIG. 3 is a diagram showing an arrow II in FIG. 2, FIG. 4 is a diagram showing a configuration of a main part of the cylinder operating means, and FIG. 5 is an operation explanatory diagram of a saw blade guide measure. FIG. 6 is a plan view of the saddle type band saw machine according to the embodiment of the present invention, in which a part of the front vice device and a part of the rear vice device are omitted, and FIG. FIG. 8 is a view taken along line IV-IV in FIG. 6.
[0011]
Here, “upper” means a table toward the paper surface in FIGS. 1 and 6, and means “upper” in FIGS. 2, 3, 5, 7, and 8, and “lower” means FIGS. 6, the back of FIG. 2, FIG. 3, FIG. 5, FIG. 7 and FIG. 8, the front means “bottom” in FIG. 1 and “front” in FIG. 2 and FIG. , FIG. 3, FIG. 6, FIG. 7 means the right, “rear” means the top in FIG. 1, the back in FIG. 2 and FIG. 7 means the left, “left” means the left in FIG. 1, FIG. 2, FIG. 8, the table in FIG. 3, FIG. 4, FIG. 7, and the bottom in FIG. “Right” means the right in FIGS. 1, 2 and 8, the back in FIG. 3, FIG. 4 and FIG. 7, and the top in FIG.
[0012]
As shown in FIGS. 6 to 8, the vertical band saw machine 1 according to the embodiment of the present invention is a machine that performs a cutting process on a workpiece W in a cutting area A, and includes a base frame 3. A support frame 5 extending in the right direction is provided at the center of the base frame 3.
[0013]
The base frame 3 is provided with a front table 7 and a rear table 9 that support the workpiece W so as to be movable in the front-rear direction. The rear table 9 includes a plurality of support rollers 11. A pair of vice guides 13 extending in the front-rear direction are provided on the left portion of the base frame 3, and a front vice device 15 and a rear vice device 17 are provided in the pair of vise guides 13. It is provided so as to be movable in the front-rear direction by operation of a cylinder (not shown).
[0014]
Here, the front vice device 15 includes a pair of vice jaws 19 and 21, and the left vice jaw 19 is movable in the left-right direction approaching and separating from the right vice jaw 21 by the operation of the vise cylinder 23. is there. Similarly, the rear vise device 17 includes a pair of vice jaws 25 and 27, and the left vice jaw 25 is movable in the left-right direction approaching and separating from the right vise jaw 27 by operation of the vise cylinder 29. .
[0015]
The support frame 5 is provided with a pair of housing guides 31 extending in the left-right direction. A pair of housing guides 31 includes a saddle-shaped saw blade housing 35 having endless band saw blades 33 driven by a housing motor 37. It is provided so as to be movable in the left-right direction. The saw blade housing 35 is provided with a driven wheel 39 and a drive wheel 41 which are supported in a state where the band saw blade 33 is wound around, and the driven wheel 39 and the drive wheel 41 are rotatable. Below the saw blade housing 35, there is provided a wheel motor 43 that is linked to the rotating shaft of the drive wheel 41.
[0016]
A pair of saw blades that guide and support the body of the band saw blade 33 so that the tooth tip of the entry portion 33a that enters the cutting region A of the band saw blade 33 faces the cutting direction side (left side) at the left portion of the saw blade housing 35. Guide devices 45T and 45U are provided, respectively. Here, one (upper) saw blade guide device 45T is connected to the other (lower) saw blade guide device 45U so that the distance between the pair of saw blade guide devices 45T and 45U can be adjusted according to the size of the workpiece W. On the other hand, the position can be adjusted in the vertical direction that approaches and separates.
[0017]
The details of the upper saw blade guide device 45T will be described as follows. Since the lower saw blade guide device 45U has substantially the same configuration as the upper saw blade guide device 45T, the detailed configuration of the lower saw blade guide device 45U is omitted.
[0018]
As shown in FIGS. 1 to 3, the saw blade housing 35 is provided with a guide main body 47 that constitutes the base of the saw blade guide device 45 </ b> T. A guide roller 49 that supports the side surface is rotatably provided, and a guide roller 51 that supports the other side surface of the body portion of the band saw blade 33 is rotatably provided at the front portion of the guide main body 47. Further, a backup roller 53 that supports the back surface of the band saw blade 33 is rotatably provided on the guide main body 47.
[0019]
A fixed insert 55 that supports one side of the body portion of the band saw blade 33 is provided at the rear part of the guide body 47, and a support arm 57 can swing back and forth via a hinge pin 59 at the front part of the guide body 47. A movable insert 61 that supports the other side surface of the body portion of the band saw blade 33 is provided on the left end portion of the support arm 57 via a mounting bolt 63 and a spherical washer 65. Here, the mounting bolt 63 is configured to be able to slightly swing with respect to the support arm 57, and when the barrel portion of the band saw blade 33 is sandwiched between the fixed insert 55 and the movable insert 61, the movable insert 61 is fixed. It is configured to follow the support surface 55.
[0020]
In order to move the movable insert 61 in the opening direction and the closing direction , an insert cylinder 67 is provided inside the guide body 47. The insert cylinder 67 is inserted into the insert hydraulic chamber 69 and the insert hydraulic chamber 69 in the front-rear direction. A piston 71 is provided so as to be movable. Further, a first spring 73 is provided between the guide main body 47 and the support arm 57 to urge the right end portion of the support arm 57 in the direction in which the right end portion is pressed against the tip end portion of the piston 71 (rearward direction).
[0021]
Here, when hydraulic oil is supplied to the insert hydraulic chamber 69, the support arm 57 swings in one direction to move the movable insert 61 in the closing direction, and when the hydraulic oil in the insert hydraulic chamber 69 is discharged, the first The support arm 57 is configured to swing in the other direction by the urging force of the spring 73 to move the movable insert 61 in the opening direction.
[0022]
In order to operate the insert cylinder 67 in each saw blade guide device 45T (45U), a cylinder operating means 75 is provided. Each cylinder actuating means 75 and the first spring 73 are supplied to the insert hydraulic chamber 69 to provide a clamping position (FIG. 5B) that clamps the body portion of the band saw blade 33 in cooperation with the fixed insert 55. the movable insert 61 to the position) indicated the move into the closing direction to form a minute clearance C between the band saw blade 33 by returning the hydraulic oil in the insert hydraulic chamber 69 to the outside of the insert hydraulic chamber 69 The movable insert 61 is configured to slightly move in the opening direction to the clearance forming position (the position shown in FIG. 5C). Here, the dimension of the clearance C means a length obtained by subtracting the thickness of the body portion of the band saw blade 33 from the interval between the support surface of the fixed insert 55 and the support surface of the movable insert 61. Implementation of the present invention In this form, the range is from 0.01 mm to 0.02 mm.
[0023]
Each cylinder operating means 75 has the following specific configuration in addition to a pump 77 that pumps hydraulic oil and a tank 79 that stores hydraulic oil.
[0024]
That is, one end of the main circuit 81 is connected to the insert hydraulic chamber 69, and the other end of the main circuit 81 is connected to the A port of the direction control valve 83. One end of a pump circuit 85 is connected to the P port of the direction control valve 83, and the other end of the pump circuit 85 is connected to the pump 77. One end of a tank circuit 87 is connected to the T port of the direction control valve 83, and the other end of the tank circuit 87 is connected to the tank 79.
[0025]
Here, when the directional control valve 83 is moved from the neutral position (position shown in FIG. 1) to the left position , the A port and the P port communicate with each other, and the other end of the main circuit 81 is connected to the pump 77. When the directional control valve 83 is switched to the right position, the A port and the T port communicate with each other, and the other end of the main circuit 81 is connected to the tank 79. In other words, the other end of the main circuit 83 can be switched between the pump connection state and the tank connection state by a switching operation of the direction control valve 83. The tank connection state does not include a state where the tank is connected to the tank 79 via the pump 77.
A non-leak valve 89 is provided in the middle of the main circuit 81, and the non-leak valve 89 has a direction restriction state that restricts the flow of hydraulic oil to the opposite side (tank 79 side) of the insert hydraulic chamber 69 side, It is comprised so that it can switch to the regulation cancellation | release state in which hydraulic fluid flows to the said opposite side. Here, the non-leak valve 89 is switched between the direction restriction state and the restriction release state by receiving an electrical signal using a solenoid. This switching is performed using a pilot pressure or manually. You can go.
[0026]
As shown in FIGS. 1 and 4, a bypass circuit 91 is connected to the main circuit 81 so as to straddle the non-leak valve 89, and a case 93 is disposed in the middle of the bypass circuit 91. The case 93 has a discharge chamber 95 connected to the pump 77 side and a return chamber 97 connected to the insert hydraulic chamber 69. A discharge piston 99 is provided in the discharge chamber 95 so as to be able to reciprocate in a liquid-tight manner via a seal member 101, and a return plunger 103 is provided in the return chamber 97 so as to be capable of reciprocating via a seal member 105. The return plunger 103 is integrally connected to the discharge piston 99.
[0027]
In addition, when the hydraulic circuit is pumped by the pump 77 when the other end of the main circuit 81 is in the pump connection state, the pressure of the discharge piston 99 moves so that the discharge piston 99 moves in a liquid-tight manner to the forward stroke end. The operating area is configured to be sufficiently larger than the pressure operating area of the return plunger 103. Further, when the other end portion of the main circuit 81 is switched from the pump connection state to the tank connection state, the discharge piston 99 is placed in the case 93 so that the discharge piston 99 returns in a liquid-tight manner to the return stroke end. Is provided with a second spring 107 that urges the valve toward the backward stroke end side (left side in FIG. 4).
[0028]
In order to allow the return plunger 103 to reciprocate properly, the case 93 is provided with an air vent hole 109 that communicates the forward side portion of the discharge chamber 95 with respect to the discharge piston 99 and the outside portion of the case 93. is there. Further, a stroke length of the discharge piston 99 may be adjusted by providing a spacer (not shown) on the return side surface (left side surface in FIG. 4) of the discharge chamber 95.
[0029]
Next, the operation of the embodiment of the present invention will be described.
[0030]
Under the above pump connected state, the other end of the main circuit 81 in each cylinder operating means 75 pumps the hydraulic oil by driving the pump 77, thereby supplying the hydraulic oil to the insert hydraulic chamber 69 via the non-leak valve 89. Supply. As a result, the movable insert 61 in each saw blade guide device 45T (45U) is moved in the closing direction to the clamping position, and the tooth tip of the entry portion is cut in the cutting direction side (left side) by the movable insert 61 and the fixed insert 55. The band saw blade is guided and supported so as to face (see FIGS. 5A and 5B).
[0031]
Also, the hydraulic oil is supplied to the insert hydraulic chamber 69 by pumping the hydraulic oil by driving the pump 77 with the other end portion of the main circuit 81 in each saw blade guide device 45T (45U) being connected to the pump. In addition, hydraulic fluid flows into the discharge chamber 95 and the return chamber 97 via the main circuit 81 and the bypass circuit 91, but the pressure action area of the discharge piston 99 is sufficiently larger than the pressure action area of the return plunger 103. Therefore, the hydraulic oil is supplied to the discharge chamber 95. As a result, the discharge piston 99 moves in a liquid-tight manner to the forward stroke end, and the return plunger 103 also moves in a liquid-tight manner integrally with the discharge piston 99.
[0032]
Further, when the other end portion of the main circuit 81 is switched from the pump connection state to the tank connection state by the switching operation of the direction control valve 83, the discharge piston 99 is liquidated to the return stroke end by the urging force of the second spring 107. The return plunger 103 moves back in a fluid-tight manner integrally with the discharge piston 99. As a result, the hydraulic oil in the insert hydraulic chamber 69 can be returned to the return chamber 97 (outside the insert hydraulic chamber 69) by an amount corresponding to the return movement amount of the discharge piston 99, and the movable insert 61 is moved to the clearance forming position. It can be moved slightly in the opening direction (see FIG. 5C).
[0033]
At this time, the non-leak valve 89 restricts the hydraulic oil from flowing to the opposite side of the insert hydraulic chamber 69 side, and the space between the return plunger 103 and the return chamber 95 is liquid-tight by the seal member 105, so that the main circuit The hydraulic oil can be blocked at a portion between the insert hydraulic chamber 69 and the non-leak valve 89 in 81 and a portion closer to the insert hydraulic chamber 69 than the return plunger 103 in the bypass circuit 91, and the position of the movable insert 61 is formed by the clearance. Can be held in position .
[0034]
As described above, with the position of the movable insert 61 held at the clearance forming position , the band saw blade 33 is moved by the pair of saw blade guide devices 45T and 45 so that the tooth tip of the entry portion 33a faces the cutting direction side. Guide support is possible.
[0035]
After the body portion of the band saw blade 33 is guided and supported by the pair of saw blade guide devices 45T and 45U, the workpiece W is conveyed and positioned in the forward direction using the rear vice device 17 (or the rear vice device 17 and the front vice device 15). Next, the drive wheel 41 and the driven wheel 39 are rotated by driving the wheel motor 43 to cause the band saw blade 33 to circulate. Then, the saw blade housing 35 is moved in the left direction (the cutting direction) by driving the housing motor 37. As a result, the workpiece W can be cut by the entry portion 33a of the band saw blade 33 in the cutting area A. Here, since the position of the movable insert 61 is held at the clearance forming position, the guide surface of the inserts 55 and 61 and the body portion of the band saw blade 33 are pressed while keeping the amount of bending of the band saw blade 33 within an allowable range. Friction can be minimized .
[0036]
After the saw blade housing 35 is moved in the cutting direction to perform one-cut cutting, the movable insert 61 in each of the saw blade guide devices 45T and 45U is once moved to the clamping position, and the clearance is formed again. It is desirable to move it to a position.
[0037]
When exchanging the band saw blade, the non-leak valve 89 is switched from the direction restriction state to the restriction release state while the other end of the main circuit 81 is in the tank connection state, and the operation in the insert hydraulic chamber 69 is performed. Oil is discharged to the tank 79 via the main circuit 81. As a result, the movable insert 61 can be moved in the above opening direction, and the band saw blade 33 can be removed from between the fixed insert 55 and the movable insert 61, and another band saw blade can be inserted between the fixed insert 55 and the movable insert 61. can do.
[0038]
As described above, according to the embodiment of the present invention, even when the band saw blade 33 is circulated, the band saw blade 33 on the guide surfaces of the inserts 55 and 61 is kept while keeping the amount of bending of the band saw blade 33 within an allowable range. Since the friction of the body portion can be reduced as much as possible, the replacement of the inserts 55 and 61 (including replacement of a part of the inserts 55 and 61) is reduced while maintaining the cutting accuracy of the workpiece W, and the life of the band saw blade 33 is maintained. Can be improved. Further, for the same reason, energy loss due to friction between the guide surfaces of the inserts 55 and 61 and the body portion of the band saw blade 33 can be reduced, and the work efficiency of the vertical band saw machine 1 can be improved.
[0039]
The present invention is not limited to the description of the embodiment of the invention described above, and other modifications can be made by making appropriate changes such as applying a pair of saw blade guide devices 45U and 45T to a horizontal saddle-shaped band saw. It can be implemented in various ways.
[0040]
【The invention's effect】
According to the invention described in claim 1 or claim 2 , even if the band saw blade is circulated, the guide surface of the insert and the band saw blade are controlled while keeping the amount of bending of the band saw blade within an allowable range. Since the friction of the body portion can be reduced as much as possible, the replacement of the insert can be reduced while maintaining the cutting accuracy of the workpiece, and the life of the band saw blade can be improved. Further, for the same reason, energy loss due to friction between the guide surface of the insert and the body portion of the band saw blade can be reduced, and the work efficiency of the band saw machine can be improved.
[Brief description of the drawings]
FIG. 1 is a view taken along line II in FIG. 2 and also shows cylinder operating means.
FIG. 2 is a front view of the saw blade guide device according to the embodiment of the present invention.
FIG. 3 is a diagram showing an arrow II in FIG.
FIG. 4 is a diagram showing a configuration of a main part of cylinder operating means.
FIG. 5 is an operation explanatory view of a saw blade guide measure.
FIG. 6 is a plan view of a saddle type band saw machine according to an embodiment of the present invention, in which a part of a front vice device and a part of a rear vice device are omitted.
7 is a view taken along line III-III in FIG.
FIG. 8 is a view taken along line IV-IV in FIG.
[Explanation of symbols]
1 vertical band saw machine 33 band saw blade 35 saw blade housing 45U saw blade guide device 45T saw blade guide device 55 fixed insert 61 movable insert 67 insert cylinder 69 insert hydraulic chamber 75 cylinder operating means 77 pump 79 tank 81 main circuit 89 bypass circuit 93 Case 95 Discharge chamber 97 Return chamber 99 Discharge piston 103 Return plunger

Claims (2)

By moving the saw blade housing with the band saw blade in the cutting direction while circulating and running the endless band saw blade guided and supported by a pair of saw blade guides, A band saw machine for cutting,
Each saw blade guide device
A guide body provided in the saw blade housing;
A fixed insert provided on the guide body and supporting one side of the body of the band saw blade;
A support arm swingably provided on the guide body;
A movable insert that is provided at one end of the support arm, supports the other side of the body of the band saw blade, and is movable in an opening direction and a closing direction;
An insert cylinder having an insert hydraulic chamber and a pistonton movably provided in the insert hydraulic chamber;
A first spring that is provided between the guide body and the support arm and biases the other end of the support arm in a direction of pressing the other end of the support arm against the tip of the piston;
When hydraulic oil is supplied to the insert hydraulic chamber, the support arm swings in one direction to move the movable insert in the closing direction, and when the hydraulic oil in the insert hydraulic chamber is discharged, the first spring is attached. The support arm is configured to swing in the other direction by the force to move the movable insert in the opening direction,
In addition, each cylinder operating means for operating the insert cylinder in each saw blade guide device is provided,
Each cylinder operating means
A main circuit that can be switched between a pump connection state in which one end portion is connected to the insert hydraulic chamber and the other end portion is connected to a pump that pumps hydraulic oil, and a tank connection state that is connected to a tank that stores hydraulic oil,
A hydraulic oil direction regulating means that is disposed in the middle of the main circuit and regulates the flow of hydraulic oil to the opposite side of the insert hydraulic chamber;
A bypass circuit connected to the main circuit so as to straddle the hydraulic oil direction regulating means;
In the middle of this bypass circuit, a case having a discharge chamber connected to the pump side and a return chamber connected to the insert cylinder side,
A discharge piston provided in the discharge chamber so as to be capable of reciprocating in a liquid-tight manner;
A return plunger which is provided in the return chamber so as to be capable of reciprocating in a liquid-tight manner, and is integrally connected to the discharge piston,
When the hydraulic fluid is pumped by the pump when the main circuit is in the pump connected state, the pressure acting area of the discharge piston is set to the return plan so that the discharge piston moves fluid-tightly to the forward stroke end. Configured to be larger than the pressure acting area of the jar,
Furthermore, each cylinder operating means
Provided in the case, so that when the other end of the main circuit is switched from the pump connection state to the tank connection state, the discharge piston returns in a liquid-tight manner to the return stroke end. A band saw machine comprising: a second spring that biases the discharge piston toward the end of the reverse stroke.   The hydraulic oil direction regulating means is a switching valve that can be switched between a direction regulating state in which hydraulic oil flows to the opposite side of the insert hydraulic chamber side and a restriction release state in which hydraulic fluid flows to the opposite side. The band saw machine according to claim 1.

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