JP6276082B2 - Band saw device - Google Patents

Description

  The present invention relates to a band saw device including a vise bed that supports a work and a band saw head that is connected to the vise bed so as to be tiltable and to which an annular band saw is mounted, and particularly relates to an improvement in the support structure of the driven pulley. It is.

  Conventionally, for example, as shown in FIG. 7A, a band saw apparatus in which a motor is disposed on the back side of the frame 108 (opposite to the user) so that the band saw can be replaced from the front side of the frame 108. 101 is known (see, for example, Patent Document 1). In the band saw device 101, the tension lever 116 is disposed on the upper side of the driven pulley 107 and fixed to the driven pulley shaft 107a. In order to apply tension by rotating the driven pulley shaft 107a, a slide groove sleeve 110 provided with an eccentric pin 115a is provided on the back side of the driven pulley shaft 107a. The spring 111 for applying tension is disposed on the rear end side of the sleeve 110 with the slide groove.

  On the other hand, for example, as in the band saw device 201 of Patent Document 2 shown in FIG. 8, a driven pulley 207 that rotates with a band saw 203 on the outer periphery is attached to a slide plate 210 that can slide along the slide surface 210 a of the frame 208. What is rotatably supported by 207a is known. In the band saw device 201, the driven pulley 207 and the tension spring 211 are both provided on the back side of the frame 208.

Japanese Patent No. 3275635 Japanese Utility Model Publication No.59-74026

  In the invention of Patent Document 1, when the driven pulley shaft 107a is rotated, the reaction force of the spring 111 compressed by the eccentric pin 115a is applied to the driven pulley shaft 107a and is pushed along the slide groove, and the band saw 103 is tensioned. It is like that. For this reason, as shown in FIG. 7A, the reaction force of the tension load of the band saw 103 (the white arrow) and the reaction force of the spring compression load (the black arrow) are applied above and below the slide groove. The surface works so that two rotational moments strengthen each other in the same direction. Further, since it is necessary to rotate the driven pulley shaft 107a in order to apply tension to the band saw 103, as shown in FIG. 7B, the sleeve 110 with a groove is circular and receives a rotational moment. There is a limit to expanding the slide surface 110a in the direction. Due to this large rotational moment and the narrow slide surface 110a, the surface pressure of the slide surface 110a increases and the slidability deteriorates.

  As a result, the followability of the driven pulley 107 is deteriorated, so that even if the driven pulley 107 and the drive pulley (not shown) are slightly eccentric, a large tension is instantaneously applied to the band saw 103. The same applies when a heavy load is applied for some reason.

  Thus, if the followability of the driven pulley 107 is poor, a large tension is instantaneously applied to the band saw 103, and the band saw breaking life is shortened.

  Further, in the band saw device 201 as in Patent Document 2, as shown in FIG. 8, two rotational moments of the tension load reaction force (white arrow) and the spring compression load reaction force (black arrow) of the band saw 203 are shown. And the slide surface 210a can be widened in the direction of receiving the rotational moment, and the followability of the driven pulley 207 is good and the band saw breaking life is long. However, since the band saw 203 is on the back side, the replacement work is difficult.

  On the other hand, even if the band saw device 201 of Patent Document 2 is configured to be reversed so that the driving pulley and the driven pulley come to the front side as in Patent Document 1, the slide plate 210 that supports the driven pulley 207 is not connected to the driven pulley. Since it comes directly below 207, the cutting powder dropped from the rotating band saw 203 accumulates on the sliding surface of the slide plate 210, and the slide of the slide plate 210 becomes worse, and the followability of the driven pulley 207 may be hindered.

  In addition, since the tension lever 216 for tensioning the band saw 203 is disposed in a direction approaching the driving pulley on the back side of the frame 208, the tension lever 216 is disposed far from the periphery of the frame, and the tension lever 216 can be operated by extending the hand toward the back side. difficult.

  One of the two binders 212 and 213 that compresses both end surfaces of the pair of tension springs 211 is fixed, the other binder 213 is movable, the band saw 203 is stretched, and the tension lever that moves the movable side binder 213 is moved. In the structure in which 216 is provided on the frame 208 side, the tension lever 216 cannot be disposed in a direction away from the drive pulley (arranged on the periphery of the frame).

  The present invention has been made in view of the above points, and the object of the present invention is to smooth the movement of the support plate that supports the driven pulley, improve the followability of the driven pulley, and shorten the breaking life of the band saw. It is to prevent.

  In addition, it is easy to operate even if the tension lever is on the back surface of the head side frame.

In order to achieve the above object, in the first invention, a vise bed for supporting a workpiece,
Is tiltably connected to said vice bed directed to a band saw apparatus that includes a band saw head having a head-side frame for supporting the driving pulleys which annular band saw is mounted on the front side.

And the band saw device
On the back side of the head side frame,
A support plate which is slidably provided on a rail-like sliding surface extending in a direction connecting the drive pulley and the driven pulley, and rotatably supports the driven pulley;
An urging member that presses the support plate in a tension direction in which the driving pulley and the driven pulley are separated and the band saw is stretched;
The biasing member is provided between the back surface of the driven pulley and the front surface of the sliding surface ,
The structure is such that the rotational moments acting on the support plate act in the direction of canceling each other by the reaction force of the tension load by the band saw and the reaction force of the pressing force of the compression coil spring .

  According to said structure, since a cyclic | annular band saw is mounted | worn with a front side, the replacement | exchange operation | work is easy. In addition, since the support plate is on the opposite side of the drive and driven pulleys and the head side frame, the head side frame does not collect cutting powder on the slide surface without adding parts to avoid cutting powder. It can be. Furthermore, since the reaction force of the tension load and the reaction force of the pressing force of the urging member work in the direction in which the rotational moment acting on the support plate cancels out, the surface pressure of the rail-like sliding surface is low and the support plate moves. Smooth and followable of driven pulley.

In the second invention, in the first invention,
The support plate is provided with an eccentric shaft at a position shifted from the support shaft of the driven pulley, and the eccentric shaft is provided with an eccentric portion for compressing the urging member by rotating and tensioning the band saw.
A tension lever that rotates the eccentric shaft is provided on the eccentric shaft, and the tension lever is disposed in a direction away from the drive pulley.

  According to the above configuration, there is an eccentric shaft that stretches the band saw at a position shifted from the support shaft of the driven pulley, and there is no need to rotate the support shaft of the driven pulley, so the support plate has a rail-like shape extending in the pulling direction of the band saw. The distance in the sliding direction can be kept long with respect to the sliding surface. That is, the surface pressure of the rail-like sliding surface due to the rotational moment acting on the support plate is low, the support plate moves smoothly, and the follower pulley has good followability. Even if there is a tension lever on the back side of the head side frame, the tension lever can be arranged on the periphery of the head side frame, so that it is easy to operate the tension lever by extending the hand to the back side.

In the third invention, in the first or second invention,
The raised portion at the peripheral edge of the opening through which the support shaft of the driven pulley is inserted in the head side frame has a radius from the rotation center of the driven pulley so that the tip of the raised portion is hidden when viewed from the radially outer side of the driven pulley. It bulges toward the surface extending in the direction .

  According to said structure, it is difficult for the cutting powder by a band saw to pass through an opening, and it becomes difficult for a support plate to slip easily by cutting powder.

  As described above, according to the present invention, it is possible to improve the followability of the driven pulley by smoothing the movement of the support plate that supports the driven pulley, and to prevent the breaking life of the band saw from being shortened.

  In addition, according to the second invention, it is easy to operate even if the tension lever is on the back surface of the head side frame.

It is sectional drawing which expands and shows a driven pulley, a tension lever, and its periphery. It is a perspective view which shows the band saw apparatus which concerns on embodiment of this invention. It is a perspective view which shows the band saw apparatus of the state which opened the cover member. It is a rear view which expands and shows a support plate, a tension lever, and its periphery. It is a perspective view which expands and shows a support plate, a driven pulley, and its periphery, omitting a head side frame. It is a perspective view which expands and shows an energizing member and its circumference, omitting a support plate. The band saw apparatus which concerns on a prior art is shown, (a) is sectional drawing, (b) is a front view. It is sectional drawing which shows the band saw apparatus which concerns on another prior art.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  2 and 3 show a band saw device 1 according to an embodiment of the present invention. The band saw device 1 is connected to a vise bed 2 that supports a workpiece and the vise bed 2 so as to be tiltable. An annular band saw 3 formed with saw teeth has a band saw head 4 mounted on the front side. The band saw head 4 includes a head side frame 8 that supports a driving pulley 6 and a driven pulley 7 on which an annular band saw 3 is mounted on the front side.

  The vise bed 2 includes a plate-like fixed vise 2a that can be fixed at a fixed position, and a movable vise 2c that moves along the linear groove 2b to sandwich the workpiece with respect to the fixed vice 2a. The movable vise 2c is connected to the vise knob 2d, and the work can be clamped at an arbitrary position on the linear groove 2b by turning the vise knob 2d.

  The head side frame 8 is made of, for example, a cast product, and a drive motor 6a for driving the drive pulley 6 is provided on the back side. The band saw head 4 is largely open at the lower side so as to surround an area where the work around the fixed vise 2a is sandwiched. The front side of the head side frame 8 is covered with a cover member 4a made of a resin molded product, for example. The band saw 3 is exposed at the lower side to become a workpiece cutting portion, and the other portion is covered with a cover member 4a. The work held between the fixed vise 2a and the movable vise 2c is cut by lifting the band saw head 4 with the handle 4b and lowering the band saw 3 at a predetermined speed. When exchanging the band saw 3, as shown in FIG. 3, the cover member 4a can be largely opened upward with the hinge 4c as the center. A caster 5 is provided on the opposite side of the vise bed 2 to the vise knob 2d, and the vehicle can run with the handle 4b lifting the vice knob 2d side.

  As shown in FIGS. 1 and 6, a driven side recess 9 is formed on the back side of the driven pulley 7 in the head side frame 8. As shown in FIG. 4, the driven recess 9 is provided with a support plate 10 that rotatably supports the driven pulley 7. As shown in FIGS. 4 and 5, the support plate 10 is made of, for example, a rectangular plate-shaped metal member having a pair of protrusions 10 a, and the pair of protrusions 10 a are formed in a pair of driven recesses 9. It is slidably provided on the rail-like sliding surface 9a. The rail-shaped sliding surface 9 a extends in a direction connecting the driving pulley 6 and the driven pulley 7. The driven pulley 7 is rotatably supported by the support plate 10 by inserting the support shaft 7a through the circular through hole 10b. The support shaft 7 a is accommodated in, for example, a circular opening 9 b formed in the driven side recess 9, and does not directly contact the head side frame 8. Thus, since the support plate 10 is slidably provided on the rail-like sliding surface 9a extending in the direction in which the band saw 3 is pulled, the distance in the sliding direction can be kept long. Further, as shown in FIG. 1, the raised portion 9 d on the front side of the driven side recess 9 bulges toward the driven pulley 7 side by a height H from the lower surface of the driven pulley 7 in a side view. Since the center side of the driven pulley 7 is recessed on the back side as compared with the outer peripheral portion, the raised portion 9d does not come into contact. It is not always necessary that the raised portion bulges to the driven pulley 7 side to a size that ensures H.

  The support plate 10 is urged in a pulling direction in which the driving pulley 6 and the driven pulley 7 are separated and the band saw 3 is stretched by a compression coil spring 11 as an urging member. Specifically, as shown in FIGS. 4 and 6, a pair of compression coil springs 11 are fitted on the outer periphery of a rod bolt 12 having one end fixed to a plate-side binder 13 on the back side of the support plate 10. . A rod-like frame-side binder 14 is screwed to the other end of the rod bolt 12 with a nut 12a, and the frame-side binder 14 is fixed to the back surface of the driven-side recess 9 with a screw 14a.

  An eccentric shaft 15 is swingably connected to the side of the support plate 10 opposite to the frame side binder 14. The eccentric shaft 15 is supported by a lever mounting portion 10c at a position displaced from the support shaft 7a of the driven pulley 7, and an eccentric pin 15a is provided at a position displaced from the center of the tip end side. A tension lever 16 is connected to the proximal end side of the eccentric shaft 15. By oscillating the tension lever 16, the eccentric pin 15 a as an eccentric portion presses the plate side binder 13 and compresses the compression coil spring 11. Due to the reaction force of the compression coil spring 11, the band saw 3 is expanded and pulled.

  As shown in FIG. 6, a screw hole 9c is provided near the sliding surface 9a. The pair of pressing plates 17 are formed with screw insertion holes (not shown) corresponding to the screw holes 9c. As shown in FIGS. 4 and 5, the screws 17a are inserted into the screw insertion holes. By fastening to the screw hole 9c, the pressing plate 17 comes into contact with the support plate 10 from the back side to prevent it from coming off, and the support plate 10 can stably slide on the sliding surface 9a.

  The tension lever 16 that rotates the eccentric shaft 15 is arranged in a direction away from the drive pulley 6, that is, on the vice knob 2d side.

  Next, the attachment operation | work of the band saw 3 of the band saw apparatus 1 which concerns on this embodiment is demonstrated.

  First, in a state where the band saw 3 is not hung, the tension lever 16 faces downward in FIGS. 4 and 6, and the driven pulley 7 is in a position where the compression coil spring 11 is free length or slightly compressed, and the band saw 3 Is easily hooked to the drive pulley 6 and the driven pulley 7.

  Next, the band saw 3 is hooked on the drive pulley 6 and the driven pulley 7, and in this state, the tension lever 16 is rotated counterclockwise from the lower side as viewed in FIG. At this time, since the tension lever 16 is arranged on the periphery of the band saw head 4, even if the tension lever 16 is on the back side of the head side frame 8, the hand is extended from the driven pulley 7 side to the back side and the tension lever 16 is moved. Easy to operate.

  In the state where the band saw 3 is stretched, the distance in the sliding direction of the support plate 10 can be kept long, so that the area where the sliding parts come into contact with each other can be increased, the frictional force is reduced by reducing the surface pressure, It is easy to slide the support plate 10, that is, the driven pulley 7.

  Further, the support plate 10 is on the opposite side of the drive pulley 6 and the driven pulley 7 and the head side frame 8, and the raised portion 9 d bulges further to the back side than the lower surface of the driven pulley 7 and is cut by the band saw 3. Since it is difficult for the powder to pass through the opening 9b, the cutting powder does not accumulate on the slide surface by the head side frame 8 without adding any parts.

  Further, as shown in FIG. 1, since the rotational moment acting on the support plate 10 works in the direction of canceling out due to the reaction force of the tension load and the reaction force of the pressing force of the compression coil spring 11, the surface of the rail-like sliding surface The pressure is low, the movement of the support plate 10 is smooth, and the followability of the driven pulley 7 is good.

  Further, there is an eccentric shaft 15 that stretches the band saw 3 at a position shifted from the support shaft 7 a of the driven pulley 7, and there is no need to make a structure for rotating the support shaft 7 a of the driven pulley 7. For this reason, the support plate 10 can maintain a long distance in the sliding direction with respect to the rail-shaped sliding surface extending in the pulling direction of the band saw 3, and the rail-shaped sliding surface due to the rotational moment acting on the support plate 10 can be maintained. The surface pressure is lowered, the movement of the support plate 10 is smooth, and the followability of the driven pulley 7 is improved.

  Therefore, according to the band saw device 1 according to the present embodiment, the movement of the support plate 10 that supports the driven pulley 7 is made smooth to improve the followability of the driven pulley, and the breaking life of the band saw 3 is prevented from being shortened. Can do. In addition, it is easy to operate even if the tension lever 16 is on the back surface of the head side frame 8.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

  As described above, the present invention is useful for a band saw device that cuts a workpiece with a band saw.

1 Band saw device
2 Vise beds
2a Fixed vise
2b Straight slot
2c movable vise
2d vice knob
3 Band saw
4 Band saw head
4a Cover member
5 casters
6 Drive pulley
6a Drive motor
7 Driven pulley
7a Support shaft
8 Head side frame
9 Driven recess
9a Sliding surface
9b opening
9c Screw hole
9d ridge
10 Support plate
10a ridge
10b Through hole
10c Lever mounting part
11 Compression coil spring (biasing member)
12 Rod bolt
12a nut
13 Plate side binder
14 Frame side binder
14a screw
15 Eccentric shaft
15a Eccentric pin (Eccentric part)
16 Tension lever
17 Presser plate
17a screw

Claims (3)

A vise bed that supports the workpiece,
The vice bed tiltably connected to, a band saw apparatus that includes a band saw head having a head-side frame for supporting the driving pulleys which annular band saw is mounted on the front side,
On the back side of the head side frame,
A support plate which is slidably provided on a rail-like sliding surface extending in a direction connecting the drive pulley and the driven pulley, and rotatably supports the driven pulley;
An urging member that presses the support plate in a tension direction in which the driving pulley and the driven pulley are separated and the band saw is stretched;
The biasing member is provided between the back surface of the driven pulley and the front surface of the sliding surface ,
The band saw device according to claim 1, wherein a rotational moment acting on the support plate is canceled by a reaction force of a tension load by the band saw and a reaction force of a pressing force of a compression coil spring . The band saw device according to claim 1,
The support plate is provided with an eccentric shaft at a position shifted from the support shaft of the driven pulley, and the eccentric shaft is provided with an eccentric portion for compressing the urging member by rotating and tensioning the band saw.
A band saw device, wherein the eccentric shaft is provided with a tension lever for rotating the eccentric shaft, and the tension lever is disposed in a direction away from the drive pulley. In the band saw device according to claim 1 or 2,
The raised portion at the peripheral edge of the opening through which the support shaft of the driven pulley is inserted in the head side frame has a radius from the rotation center of the driven pulley so that the tip of the raised portion is hidden when viewed from the radially outer side of the driven pulley. A band saw device that bulges toward a surface extending in a direction .

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