JPH0558362B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] In recent years, in order to effectively utilize thinned wood, attempts have been made to cut off four sides of thin logs and use them as square lumber.

By the way, the above-mentioned square timbers, floor pillars, and other precious woods and ordinary pillar materials have the disadvantage that they crack when dried due to differences in moisture content, shrinkage rate, etc. of the materials. As a way to eliminate these cracks, a crack-preventing process called core sawing was used, in which cuts were made on one side of the column in the longitudinal direction of the column. However, it could not be used in areas where the entire circumferential surface was exposed because the cut lines were an eyesore.

An effective way to eliminate cracks in wood without core sawing is to drill a through hole in the center of the wood to absorb the shrinkage of the wood. However, such wood is long and requires very deep holes to be drilled.

The present invention relates to a woodworking drilling machine for drilling deep holes as described above, and to a device for supporting a long drill so that the drill core does not run out.

[Conventional technology]

Conventional drilling machines for woodworking are cantilever type with a headstock, and at best, a guide means is provided at the tip of the drill, and there are no drills that support the drill itself at multiple points. Nakatsuta.

[Problem to be solved by the invention]

With conventional cantilever type drilling machines, it is difficult to accurately align the center of a long drill and the center tends to run out due to deflection due to its own weight, making it difficult to accurately drill long and deep holes. It was difficult to put it on. In view of these shortcomings of conventional products, the present invention provides a deep hole drilling machine for woodworking, especially a long drill, which can drill deep holes with as little center deviation as possible even when the drill is long. He invented the supporting device.

[Means to solve the problem]

A fixed pedestal 9 for supporting the tip of the drill is disposed at the front of the movement process of the headstock 3, which holds the base end of the drill 7 and moves back and forth along the guide rod 2. And between the headstock 7 and the fixed pedestal 9,
A movable pedestal 10 is provided to support the middle part of a long drill. This movable pedestal 10 is moved in the same direction as the headstock 3 and at a slower speed than the headstock 3.

A plurality of movable cradle disposed between the fixed pedestal 9 and the headstock 3 can be provided at intervals that substantially equally divide the space between the headstock 3 and the fixed pedestal 9. At this time, the plurality of movable pedestals 10, 10 are moved at a slower speed as they move closer.

The means for moving the movable pedestal may be changed to various mechanisms, but for example, an air cylinder 27 that urges the movable pedestal forward, and a mechanism between the movable pedestal 10 and the headstock 3 are used. Wind the rope 22,
By winding and unwinding, the distance between the movable cradle 10 and the headstock 3 can be successively changed.

[Effect]

The drill 7, which is the long dimension of a deep hole drilling machine, has its base end attached to the headstock 3 and is driven to rotate, but its front end is supported by a fixed pedestal 9, and its middle part is It is supported by movable pedestals 10 and 11 to prevent the drill from swinging.

As the drilling work progresses, when the headstock 3 moves forward, the movable supports 10 and 11 also move forward, but at this time, the moving speed of the movable supports is slower than the moving speed of the headstock. , the fixed pedestal and the movable pedestal, and the movable pedestal and the headstock move closer together. That is, when the headstock moves, the drill is always supported by the movable pedestal between the moved headstock and the fixed pedestal.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a long drill support device for a deep hole drilling machine for woodworking according to the present invention will be described based on the accompanying drawings.

1 to 4 show an embodiment of a drilling machine using two movable pedestals, and a pair of guide rods 2, 2 are installed on one side of the main body frame 1.
A headstock 3 is movably mounted on the guide rods 2, 2. That is, a rack 4 is installed on one side of the main body frame 1, and a motor 5 for movement is provided on the headstock 3 to drive a pinion 6 that meshes with the rack 4.

A main motor 8 for driving the drill 7 is mounted on the headstock 3, and holds the base end of the drill 7.
This is driven to rotate. The tip of the long drill 7 is supported by a fixed pedestal 9, and movable pedestals 10 and 11 are further provided between the headstock 3 and the fixed pedestal 9, and the middle part of the drill is supported by a fixed pedestal 9. are being paid.

A mechanism for supporting the workpiece is provided ahead of the fixed pedestal 9. That is, a rotary table 12 is provided, whose center position is pivotally supported by the main body frame 1, and which can rotate 180 degrees in a plane.
A chuck device 13, 13 for the workpiece is provided. In addition, a fixing device 14 for selectively fixing one of the front and rear ends of the rotary table 12 is provided immediately before the fixed pedestal 9, and a fixing device 14 is provided for selectively fixing either the front or rear end portions of the rotary table 12. The drill 7 is fixed in such a manner that the center of the workpiece held by the drill 7 and the center of the drill 7 are aligned with each other.

Therefore, in the drilling machine of the illustrated embodiment, a long workpiece is held by the chuck devices 13, 13 of the rotary table 12, a deep hole is drilled from one end with the drill 7, and then the rotary table 12 is rotated 180 degrees. A deep hole can be drilled in the same way from the other end of the workpiece by rotating the drill plane, and a hole can be drilled twice as deep as the effective dimension of the drill.

The headstock 3 and movable cradle 10, 11 that hold the base end of the long drill 7 and drive it are
Both move on a guide rod 2. The guide rod 2 is shaped like a bar with a circular cross section, and is fixed with a bolt 16 to the top of the mounting base 15 having an inverted T-shaped cross section, as can be understood from FIGS. 5 and 6. 1 with bolts 17, 17. As shown in FIG. 5, open bearings 18, 18 are mounted on the headstock 3, and these are fitted into the guide rods 2, 2. Similarly, the movable pedestals 10 and 11 are also fitted to the guide rods 2, 2 by open bearings 18, 18, as shown in FIG.

In the above embodiment, the guide rod 2 is rod-shaped with a circular cross section, but it may also be oval or square in shape.In short, it is in the shape of a track and can support the headstock 3 and movable pedestals 10 and 11. The bearing 18 is not limited to the embodiment as long as the bearing 18 is an open type bearing as in the above embodiment, or may be a bushing. It is not limited to the embodiment as long as it can slide smoothly on the guide rod 2.

In other words, the guide rods 2, 2, the headstock 3, and the movable supports 10, 11 constitute a linear guide.

A support member 19 for the drill 7 is vertically disposed at the center of a movable pedestal 10 whose both ends fit into the guide rods 2, 2 and is movable along the guide rods 2.

A bush 20 made of a synthetic resin bearing material is attached to the support member 19 to prevent the drill from swinging.

In the illustrated embodiment, as can be understood from FIGS. 5 and 6, the two guide rods 2 and 2 and the drill 7 are arranged on the same plane, so that the force such as cutting resistance acting on the drill 7 is reduced. However, the headstock 3 and movable pedestal 1
0,11 so as not to act as an overturning moment.

A rope 22 is wound between the headstock 3 and the movable pedestal 10, which move back and forth along the guide rod 2, to adjust the speed of movement of both. That is, the headstock 3 is driven by the motor 5 and moves back and forth along the guide rod 2, and a driven pinion 21 that meshes with the rack 4 is provided in addition to the driving pinion 6. One end of the rope 22 is fixed to the headstock 3 and wound around the roller 23 of the movable pedestal 10 arranged at a predetermined interval, and then the other end is installed coaxially with the driven pinion 21. The film is wound around a roller 24 that has been rolled up.

Another movable pedestal 11 is arranged in front of the movable pedestal 10. A rope 25 has one end fixed to the main body frame 1 behind the movable pedestal 11.
is wound around a roller 26 provided on the movable pedestal 11, and the other end is connected to the movable pedestal 10 at the rear. Furthermore, an air cylinder 2 is installed on the back of the main body frame 1.
7 is provided to urge the front movable pedestal 11 forward.

However, as shown in Figures 1 to 3,
In front of the headstock 3 on the guide rod 2, at predetermined intervals determined by the lengths of the ropes 22 and 25,
Two movable supports 10 and 11 are arranged, and when the headstock 3 moves forward, the pinion 21 rotates,
The rope 22 is wound up and the headstock 3 and movable pedestal 1
The distance between the 0's narrows and they all move forward. At this time, the front movable pedestal 11 is attached to the rope 25
Due to the turning action, the headstock 3 moves forward at half the speed of the movable pedestal 10, and finally the headstock 3 reaches the front end of the guide rod as shown in FIG. The state in which the headstock 3 reaches the front end of the guide rod 2 is the final stage of drilling a deep hole with the drill, and the drill 7 itself is inside the hole in the workpiece to prevent runout. It will also be done. The movement of the headstock 3 backward after machining is completed is completely opposite to the movement forward, but at this time the forward bias by the air cylinder 27 is released.

In the embodiment shown in FIGS. 1 to 4, the speed ratio of the front movable pedestal 11 and the rear movable pedestal 10 is 1:2, so they are arranged at approximately equal intervals from the fixed pedestal 9. However, since the speed ratio between the rear movable pedestal 10 and the headstock 3 is determined by the effective diameter of the pinion 21 and the winding diameter of the roller 24, the interval can be set arbitrarily.

If the fixed pedestal 9, the movable pedestals 10 and 11, and the headstock 3 are arranged at equal intervals, the speed ratio of the headstock 3 and the movable pedestal 10 is set to be 3:2.

The drive mechanism for moving the headstock and the movable pedestal is not limited to the method of winding a rope or winding a wound rope, but can be modified as appropriate, such as a combination of a feed screw and a reduction gear. Also, the movable pedestal may be one as shown in Fig. 8,
On the contrary, there may be three or more. The embodiment shown in FIG. 8 generally corresponds to the embodiment shown in FIGS. 1 to 4 without the movable pedestal 11 at the front, and the air cylinder 27 is connected to the movable pedestal 10.

In the embodiment shown in FIG. 8, a method is adopted in which one end of the rope 22 is wound, but it is also possible to fix one end of the rope to the main body frame 1 and simply wind it. A method of simply winding the rope without winding it can be used for items with two or more movable cradle, but in this case, the front movable cradle, the rear movable cradle, and the rear movable cradle may be used. Since the speed ratio between the spindle and the headstock is 1:2, it is not possible to arrange a plurality of movable supports at approximately equal intervals. On the other hand, in the case of a method in which one end of the rope is wound up, the speed ratio can be set arbitrarily.

FIG. 9 uses two movable pedestals, and the method of winding the rope is also applied between the front movable pedestal and the rear movable pedestal. Pinion 28 meshing with rack 4
A roller 29 for winding is installed. If this method is continued, even if the number of movable pedestals increases to three or more, the intervals between the movable pedestals can be made almost equal.

FIG. 7 shows the support structure of the rotary table 12.
A rotary table 12 is fixed to a rotary shaft 32 supported by bearings 30 and 31 to the main body frame 1, and this rotary table 1
A chuck device 13 for the workpiece is attached to 2. The chuck device 13 has a pair of left and right pressing members 3.
3 and 34 are moved by a screw 36 driven by a handle 35, and the screw 36 has opposite threads on the right and left sides of the center position of the rotary table.

The rotary table 12 is rotated 180 degrees in plane with respect to the main body frame 1, and is fixed by a fixing device 14 with its longitudinal center line coinciding with the center line of the drill 7. This fixing device 14 is provided just before the fixed pedestal 9 that supports the drill 7, and its structure includes a clamping piece 37 driven by an air cylinder, and a locking piece 37 protruding from both ends of the rotary table 12. The plate 38 is made to be attached and detached. In the drawing, the locking plate 38 has a hook shape with a notch formed therein, and is configured to be clamped while being accurately fitted to the drive shaft of the clamping piece 37.

〔Effect of the invention〕

According to the long drill support device in the deep hole drilling machine for woodworking according to the present invention as set forth in claim 1, the long drill is supported on a cantilever, and the long drill is supported by a plurality of fixed pedestals and movable pedestals. As a result of being supported by a fulcrum and being driven without causing lateral vibration or centering, it is possible to accurately drill deep holes, such as through-holes in the center of architectural pillars. .

Further, in the invention as claimed in claim 2, in the invention as claimed in claim 1, as a result of having a plurality of movable cradle, it is possible to support the long drill with more fulcrums and drive it accurately. Moreover, the drilling work can proceed smoothly without the movable pedestals colliding with each other.

According to the invention described in claim 3, the movable pedestal can be moved by a simple combination of an air cylinder, a rope, and a pinion that winds the rope, and the moving speed of the movable pedestal can be arbitrarily selected. be able to.

According to the invention as set forth in claim 4, when a plurality of movable cradles are used, the moving speed of the plurality of movable cradles can be adjusted by a simple mechanism using a rope and a pinion, and
In other words, the arrangement interval of the movable pedestals can be arbitrarily selected.

According to the invention set forth in claim 5, it is possible to arrange a plurality of movable pedestals using a simpler mechanism than the one set forth in claim 4, in which the rope winding mechanism is omitted.

[Brief explanation of drawings]

The attached drawings show an embodiment of the long drill support device in a deep hole drilling machine for woodworking according to the present invention, in which Figure 1 is a front view of the entire drilling machine, Figure 2 is a plan view of the entire drilling machine, and Figure 3 is a plan view of the entire drilling machine. Figures 4 and 4 show the movement of the headstock and movable pedestal, and Figure 3 shows the state in which the headstock is retracted;
Fig. 4 is a front view schematically showing a state in which the headstock is advanced, Fig. 5 is a sectional view taken along the line - - in Fig. 1, and Fig. 6 shows the structure of the movable pedestal. 7 shows the structure of the rotary table.
FIG. 9 is a front view schematically showing each modified embodiment. 1...Body frame, 2...Guide rod, 3...
Headstock, 4...Rack, 5...Motor, 6,2
1, 28... Pinion, 7... Drill, 9... Fixed pedestal, 10, 11... Movable pedestal, 12... Rotating table, 18... Open bearing, 19... Support member, 20... Butsuyu, 22, 25...rope,
23, 24, 26, 29...roller, 27...air cylinder.

Claims (1)

[Claims] 1. A fixed pedestal 9 that holds a long drill 7 on a headstock 3 that moves in the front-rear direction along the guide rod 2, and supports the drill 7 in front of the movement process of the headstock 3. A movable pedestal 10 that moves along the guide rod 2 and supports the middle part of the drill is provided between the fixed pedestal 9 and the headstock 3, and the movable cradle 10 is connected to the headstock 3. A long drill support device for a deep hole drilling machine for woodworking, characterized in that the long drill support device is configured to move in the same direction at a slower speed than the headstock. 2. A plurality of movable pedestals 10, 11 are provided at approximately equal intervals between the fixed pedestal 9 and the headstock 3, and the plurality of movable pedestals 10, 11 are moved at a slower speed as they move closer to each other. A long drill support device for a deep hole drilling machine for woodworking according to claim 1. 3 An air cylinder 27 is connected to the movable pedestal 10 to urge it forward, and a rope 22 is wound between the movable pedestal 10 and the headstock 3, and the rope 2
2. The elongated drill support device for a woodworking deep hole drilling machine according to claim 1, wherein the long drill support device is adapted to take up and unwind the long drill at a speed slower than the moving speed of the headstock. 4 Connect an air cylinder 27 for urging forward to the movable pedestal 11 at the forefront of the plurality of movable pedestals, and wind a rope 22 between the movable pedestal 10 at the rear and the headstock 3, and 3. The rope 22 is wound up and unwound at a speed slower than the moving speed of the headstock, and further the rope 25 is wound between the movable supports, and the rope is wound and unwound. A long drill support device for deep hole drilling machines for woodworking. 5 At the frontmost movable pedestal 11 of the plurality of movable pedestals,
Connecting an air cylinder 27 that urges forward, winding a rope 22 between the rearmost movable pedestal 10 and the headstock 3, and winding the rope 22 at a speed slower than the moving speed of the headstock, Furthermore, one end of the rope 25 of a predetermined length is fixed to a fixed point on the frame, and the rope is wound around a movable pedestal in front of the fixed point and connected to the movable pedestal in the rear. The elongated drill support device for a deep hole drilling machine for woodworking according to claim 2.