JPH05228905A - Drill supporter in deep hole drill for woodworking - Google Patents

Abstract

PURPOSE:To move a moving pedestal within a range that the moving pedestal avoids the run-out of a drill at all times as drilling operation by the drill progresses when the intermediate section of the drill is supported by the moving pedestal in order to prevent the run-out of the drill in long size, and to simplify the driving means of the moving pedestal in the deep hole drill for woodworking drilling a deep hole such as a through-hole through a work in long size. CONSTITUTION:A rear end section is held on a head stock 2 in a drill 1 forwarded and retreated toward and from a work in long size, and a front end section is supported to a fixed pedestal 3 brought near to the work and fixed while an intermediate section is supported by one or two or more of moving pedestals 4. The fixed pedestal, the moving pedestals and the head stock are connected by connecting rods 5, 8 so as to be able to slide freely within a predetermined range of interval in the correlation of the adjacent pedestals and head stock.

Description

Detailed Description of the Invention

[0001]

[Industrial field of application] In recent years, in order to effectively use thinned wood, it has been practiced to cut out four relatively thin logs of four faces and use them as square lumber. It is known that such square timbers, general pillars such as timbers and logs, or floor pillars cause cracks due to drying due to differences in water content and shrinkage ratio between the central part and the peripheral part of the pillars. .. In order to prevent cracks or to dry the inside of the workpiece, a notch called "grinding" is performed in the longitudinal direction on one side of the column to reach almost the center. This core grinding process absorbs the difference in shrinkage rate of wood by expanding the notch and prevents cracks from occurring on the surface of the pillar, but depending on the purpose of the pillar material, the notch appears on the surface. However, there is a drawback that when the cut portion expands, it deforms as a pillar material.

In order to prevent cracking of the pillar material without performing core grinding, it is effective to form a through hole at the center of the pillar material and absorb the shrinkage of the wood. However, such a pillar material has a long dimension, and it is necessary to form a very deep hole.
The present invention relates to a drilling machine for drilling a deep hole as in the above case, and relates to a bearing device for bearing a middle portion of a long-sized drill so as not to cause runout.

[0003]

2. Description of the Related Art In a conventional general woodworking boring machine and drilling machine for woodworking, it was usual to rotate a workpiece by supporting a drill cantilevered by a headstock. The applicant holds the base end of a long-sized drill on a headstock that advances and retreats toward the workpiece, supports the tip on a fixed bearing stand, and supports the middle part of the drill on a moving bearing stand. We have developed a drilling machine that can process deep holes, such as drilling through holes in pillars, without causing runout as much as possible by receiving them. Further, as a support device for supporting an intermediate portion of a long-sized drill, a concept of providing a moving bearing stand that moves at a slower speed than the headstock between a fixed bearing stand and the headstock (JP-A-1-247102). Is inventing.

[0004]

In the deep hole drilling machine according to the applicant's earlier application, the moving speed of the headstock that pushes the drill toward the workpiece is slower than the moving speed of the headstock. The moving bearing stand is moved by. Specifically, it proposes to forcibly move the moving bearing stand by a cylinder or rope. However, in the case of forcibly moving the movable bearing stand, the drive device is required and the device itself becomes complicated. It is an object of the present invention to make the structure relating to the movement of the movable bearing base a simpler structure.

[0005]

As a result of the research conducted by the present inventors, it is preferable that the support positions of the drill by the movable bearing base are arranged at equal intervals between the fixed bearing base and the headstock. However, it has been found that the runout can be sufficiently avoided by supporting the middle portion of the drill within a certain range even if the intervals are not exactly equal. A long-sized drill 1 has its base end held on a headstock 2 which advances and retreats toward a workpiece A, and its tip end supported by a fixed bearing base 3. The middle part of the drill 1 is the headstock 2
And a fixed bearing base 3 are supported by a movable bearing base 4 which is freely movable, and the fixed bearing base 3, the movable bearing base 4 and the headstock 2 are supported.
Are connected by connecting rods 5 and 8, respectively. The connecting rods 5 and 8 have stoppers 6 and 9 at one end fixed to the front end and penetrating the rear end to prevent the connecting rods from coming off.

[0006]

When the headstock 2 is in the most retracted state, as shown in FIG. 1 (a), the tip of the drill 1 is supported by the fixed bearing base 3 and the moving bearing base 4 is supported at its intermediate position. ing. Since the distance between the fixed bearing stand 3 and the moving bearing stand 4 and the distance between the moving bearing stand 4 and the headstock 2 are the farthest distances L ₁ and L ₂ regulated by the stoppers 6 and 9, they can move. Can not.

When the headstock 2 starts moving toward the work A, as shown in FIG. 1 (b), the tip of the drill 1 projects from the fixed bearing base 3 and is fixed to the work A. To start drilling. At this time, the movable bearing base 4 supports the intermediate position of the drill 1 in a state where it can freely move between the fixed bearing base 3 and the headstock 2. That is, the moving bearing stand 4
Also, the headstock 2 is slidable on the connecting rods 5 and 8 and is allowed to move only within a certain range of a distance closest to each other and a distance farthest from each other. The total distance between the headstock 2 and the fixed bearing base 3
Has become the interval.

When the headstock 1 is moved to the most forward position, the fixed bearing stand 3, the moving bearing stand 4 and the headstock 2 are closest to each other and stopped at that position, as shown in FIG. 1 (c). become. In this way, the moving bearing base 4 becomes the headstock 2
Moves toward the fixed bearing stand, it is always located between the fixed bearing stand 3 and the headstock 2 even though no drive means is provided for moving the moving bearing stand 4, and The distance between the fixed bearing base 3 and the headstock 2 does not become wider than the distances L ₁ and L ₂ required to prevent runout of the drill 1. That is, the connecting rod functions as a mechanical stopper at the front and rear ends with respect to the movement of the headstock.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a drill support device for a deep hole drilling machine for woodworking according to the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a plan view schematically showing a drill support device according to the present invention. As shown in FIG. 1 (a), a long drill 1 has its base end held by a headstock 2 which advances and retreats toward a workpiece A, and its tip end supported by a fixed bearing base 3. ,
The middle part of the drill 1 is supported by one moving bearing stand 4.

On the fixed bearing base 3, one end of a connecting rod 5 is fixed in parallel with the drill 1, and the other end is provided with a stopper 6 which loosely penetrates the moving bearing base 4 and prevents the stopper from coming off.
The connecting rod 5 is provided with another stopper 7 at a fixed dimension l ₁ from the fixed bearing base 3, and the movable bearing base 4 is connected by the connecting rod 5 in a relative relationship with the fixed bearing base 3. _{It is} possible to freely slide in the range of L ₁ 'between stoppers 6 and 7 except for the constant dimension l ₁ of ₁ . The fixed dimension l ₁ from the fixed bearing stand 3 is a dimension that allows the fixed bearing stand 3 and the moving bearing stand 4 to be closest to each other, and avoids a phenomenon in which the moving bearing stand 4 collides with the fixed bearing stand 3. To do.

One end of another connecting rod 8 is fixed to the movable bearing base 4, and this connecting rod 8 extends through the headstock 2 and is provided with stoppers 9 and 10 as in the case of the connecting rod 5. In the relative relationship between the headstock 2 and the moving bearing base 4, a constant dimension l ₂ of the maximum distance L ₂ connected by the connecting rod 8
It is possible to slide freely within the range of L ₂ 'excluding. At the most retracted position of the headstock 2 shown in Fig. 1 (a), the fixed bearing base 3
The distance between the headstock 2 and the headstock 2 is the distance L ₁ at which the fixed bearing stand 3 and the moving bearing stand 4 are farthest apart, and the distance between the moving bearing stand 4 and the headstock 2 is L ₂ so that the moving bearing stand is 4 is in a state in which it cannot move at all.

As shown in FIG. 1 (b), when the headstock 2 starts to move toward the front side of the workpiece A, the gap between the fixed bearing base 3 and the headstock 2 narrows, and the moving bearing bases 4 move toward each other. It is possible to freely slide in the range of l except for the closest distances l ₁ and l ₂ . When the headstock 2 moves further in the forward direction, the fixed bearing stand 3 and the moving bearing stand 4 are moved as shown in FIG. 1 (c).
And the distance between the headstock 2 reaches the closest positions of l ₁ and l ₂ , respectively. In this state, the moving bearing stand 4 does not move.

In FIG. 2, two movable bearing bases 4 and 4'are provided between a fixed bearing base 3 and a headstock 2, and a drill 1 having a longer dimension is provided.
It is designed to be able to deal with. The headstock 3 and the first moving bearing base 4 are connected by a connecting rod 5, and the second moving bearing base 4'and the headstock 2 are connected by a connecting rod 8, respectively, and the moving bearing bases 4 and 4'are connected by a connecting rod 11. Are linked by. Similar to the connecting rods 5 and 8, the connecting rod 11 has a stopper 12 for preventing it from coming off, and a space closest to the stopper 12.
A stopper 13 that regulates l ₃ is provided. In the case where the two movable bearing bases 4 and 4'are provided, the farthest distance between the fixed bearing base 3, the two movable bearing bases 4 and 4 ', and the headstock 2 is regulated by the connecting rods 5, 8 and _11. , L ₂ , L ₃ ,
It is possible to freely slide within the range of L ₁ ', L ₂ ' and L ₃ 'relatively.

At the most retracted position of the headstock 2 shown in FIG. 2 (a), the fixed bearing base 3, the movable bearing bases 4 and 4 ', and the headstock 2 are spaced at intervals L ₁ , L ₂ and L ₃ , respectively. , Moving bearing stand 4,
4'cannot move. And the fixed bearing stand 3
The headstock 2 and the headstock 2 are connected by the connecting rods 5, 8 and 11 and function as a mechanical stopper and a safety device against the backward movement of the headstock 2.

At the position where the headstock 2 shown in FIG. 2 (b) has moved partway toward the workpiece A, the movable bearing bases 4 and 4'are fixed bearing bases 3 restricted by the presence of the stoppers 7 and 10. And the range of l except the closest distances l ₁ and l ₂ to the headstock 2, and the distance between the fixed bearing base 3 and the moving bearing bases 4 and 4 ′ and the headstock 2 that can be most separated from each other is L. It is possible to move freely within the range of ₁ , L ₂ , L ₃ and the approachable distances satisfying the conditions of l ₁ , l ₂ , l ₃ . At a position where the headstock 2 is the most advanced is shown in FIG. 2 (c), the fixed bearing stand 3, the mobile bearing block 4, 4 ', interval headstock 2 collides becomes l _1, l _2, l _3, respectively In addition, the movable bearing bases 4 and 4'become in a state of not moving. In other words, the headstock 2 cannot move forward and functions as a mechanical stopper.

When the moving bearing stand 4'and the headstock 2 approach the fixed bearing stand 3 and the moving bearing stand 4 in front of the front to some extent, the tips of the connecting rods 5 and 11 move to the moving bearing stand 4'and the headstock 2. Will be in the movement range of. Therefore, in order to prevent the rear ends of the connecting rods 5 and 11 from colliding with the moving bearing base 4'and the headstock 2, the size of the connecting rods 5 and 11 including the stoppers 6 and 12 passes in the illustrated embodiment. Through holes 14, 15, 16 are provided in the moving bearing base 4 ′ and the headstock 2. Instead of providing the through holes 14 to 16, the shapes of the moving bearing base 4 ′ and the headstock 2 and the mounting positions of the connecting rods may be devised. The connecting rods 5, 8 and 11 are arranged parallel to the drill 1 and on different linear loci so as not to collide with each other.

FIG. 3 is an overall front view showing an example of a deep hole drilling machine for woodworking embodying the present invention. The present invention may be applied to a deep hole punching machine that performs machining from only one end of the workpiece, but in the embodiment shown in FIG. 3, the work fixing portion 18 is arranged at the center of the main body frame 17. The drills 1 and 1 that move forward and backward toward the work fixing portion 18 are arranged on both the left and right sides thereof. By doing this, it is possible to perform processing from both ends of the work piece and to form through holes in the work piece A having a longer dimension. The fixed bearing pedestals 3 and 3 are located as close to the end surface of the workpiece A as possible,
When this is moved toward the work fixing portion 17 so that it can be fixed at that position, it is possible to deal with the processing of the workpiece A having different lengths. Left and right drill 1,1
Since the same ones face each other, one of them will be specifically described below.

As shown in FIGS. 4 and 5, the base end portion of the drill 1 is detachably attached to a spindle 19 provided on the headstock 2 and is rotationally driven by a motor 20, while the tip end portion is fixed to a main body frame 17. It is supported by the fixed bearing base 3. In addition, the middle part of the drill 1 has two moving bearing bases 4,
It is supported by 4 ', so that the long drill does not bend or run out. That is, the embodiment shown in FIG. 3 and subsequent figures corresponds to the embodiment of the drill support device shown in FIG.
If one of the movable bearing bases 4 and 4'is omitted, the embodiment of the drill support device shown in FIG. 2 is obtained.

On the body frame 17, two guide rods 21, 21 are laid in parallel with the traveling direction of the drill 1, on which the two movable bearing bases 4, 4'and the headstock 2 move. I have to. The fixed bearing base 3 can also be moved along the guide rod 21 and can be fixed at any position where it has moved. As can be understood from FIG. 5 and FIG. 6, a feed screw 23 which is rotationally driven by a motor 22 is provided below the drill 1 in parallel with the drill, and the feed screw 23 is fixed to the female screw 24 fixed to the headstock 2. By screwing the headstock 2 forward and backward toward the workpiece.

No drive means is provided on the movable bearing bases 4 and 4 ', the fixed bearing base 3 and the movable bearing base 4 are connected by the connecting rod 5, and the movable bearing bases 4 and 4'are connected by the connecting rod 11. The movable bearing base 4'and the headstock 2 are connected by a connecting rod 8. The specific structure and function of this connecting rod are as described above with reference to FIGS. 1 and 2.

All the three connecting rods 5, 8 and 11 are arranged in parallel with the drill 1 at different positions on the same plane. Figure 6
As shown in FIG. 3, the connecting rod 8 is loosely penetrating the headstock 2, but the connecting shaft 5 has a large through hole 16 through which the connecting rod 5 freely passes and a large through hole 15 through which the connecting rod 11 passes. It is provided. Further, as shown in FIG. 7, the movable bearing base 4'is provided with a connecting rod.
The movable bearing base 4'is provided with only one large through hole 14 through which the connecting rod 5 can freely pass.

The movable bearing bases 4 and 4'can freely move within a range regulated by the connecting rod, and their positions are not fixed. Even if the headstock 2 moves a little, the movable bearing bases 4 and 4'may not move. However, when the headstock moves and the drill 1 moves forward while rotating, it is often pushed forward to some extent by the resistance at the time of movement, and the intervals are naturally approximately equal. However, even if the distances between the movable bearing bases 4 and 4'are not equal to each other, the distance does not become larger than the maximum distance capable of preventing the runout of the drill 1, and the collision does not occur. Even if the moving bearing bases 4 and 4'contact the fixed bearing base 3 and the headstock 2, as long as they do not hinder the support of the drill 1, the position of the stopper closest to the position No regulation is required.

A general metal bearing may be used for the fixed bearing stand 3 and the movable bearing stands 4, 4'for supporting the drill 1. However, in such a fixed bearing, the cutting blade of the drill is used. If they come into contact, they can wear down the bearings themselves. In order to avoid this, the present inventor utilizes rotary bearings such as ball bearings and roller bearings. With this arrangement, when the drill comes into contact with the contact resistance, the sleeve starts to rotate together with the drill, and damage to the bearing itself can be avoided as much as possible.

[0024]

According to the drill support device for a deep hole drilling machine for woodworking of the present invention as set forth in claim 1, the middle portion of the drill, which is long in order to prevent runout of the drill, is supported by a movable bearing stand. Upon receipt, no moving device is required for the movement of the moving bearing stand itself, and moreover the moving bearing stand does not extend beyond an effective spacing to avoid runout of the drill.

According to the second aspect of the present invention, even when a drill having a longer dimension is used, the runout of the drill can be effectively avoided.

[Brief description of drawings]

FIG. 1 is a plan view schematically showing the relationship between a drill, a headstock and a moving bearing stand of a deep hole drilling machine for woodworking according to an embodiment of the present invention,

FIG. 2 is a plan view schematically showing the relationship between the drill, the headstock and the two moving bearing stands of the deep hole drilling machine for woodworking according to the embodiment of the present invention,

FIG. 3 is an overall front view of a deep hole drilling machine for woodworking utilizing the present invention,

FIG. 4 is a front view showing only the right half of FIG.

5 is a plan view showing only the right half of FIG.

6 is a sectional view taken along line XX of FIG.

FIG. 7 is a sectional view taken along line YY of FIG.

[Explanation of symbols]

1-drill, 2-headstock, 3-fixed bearing base, 4,
4'-moving bearing stand, 5,8,11-connecting rod, 6,7,9,
10, 12, 13-Stopper, 14, 15, 16-Through hole.

Claims (2)

[Claims] 1. A base end portion of a long-sized drill 1 is held on a headstock 2 which advances and retreats toward a workpiece A, and a tip end portion thereof is a fixed bearing base 3.
And a movable bearing stand 4 which allows the intermediate part of the drill 1 to move freely between the headstock 2 and the fixed bearing stand 3
Supported by the fixed bearing stand 3 and the moving bearing stand 4, and the moving bearing stand 4 and the spindle headstock 2.
Are connected by connecting rods 5 and 8, respectively, and the connecting rods 5 and 8 have fixed bearing bases 3 and movable bearing bases 4 whose one ends are forward.
A drill support device for a deep hole drilling machine for woodworking, characterized in that stoppers 6 and 9 are provided at the rear end of the movable bearing stand 4 and the headstock 2 so as to prevent them from coming off. .. 2. A plurality of moving bearing bases 4 and 4'are arranged between the fixed bearing base 3 and the headstock 2, and the moving bearing bases 4 and 4'are connected by a connecting rod 11, and the connecting rod 11 is connected. 2. A drill support for a deep hole drilling machine for woodworking according to claim 1, wherein one end is fixed to the front end and a rear one is loosely penetrated to provide a stopper 12 at the rear end portion for preventing the same from coming off. apparatus.