Cutting by use of rotating axially moving tool – Machine including plural tools – Coaxial tools
Reexamination Certificate
1999-09-01
2001-02-06
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
Machine including plural tools
Coaxial tools
C408S053000, C408S124000, C409S144000, C409S215000
Reexamination Certificate
active
06183172
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a structure for detachably mounting a horizontal drill head on a drill head of a machine tool such as a wood working machine.
2. Description of Background Art
In a conventional mounting structure, the detachable horizontal drill head is mounted on the drill head of the machine tool by securing the driving shaft of the horizontal drill head to the spindle of the machine tool as well as by securing the guide pin slidably inserted into the pin bore formed in the head case of the machine tool to the horizontal drill head. That is, the horizontal drill head is secured to the machine tool by the driving shaft and the guide pin slidable in the pin bore formed in the head case of the drill head of the machine tool.
In such a manner, the detachable horizontal drill head can be mounted on the drill head of the machine tool when horizontal drill working is required and the mounted horizontal drill head can be vertically advanced toward and retracted from the work placed on the work table by the vertical actuation of the driving spindle of the machine tool.
However, since the pin bore for slidably receiving the guide pin is formed in the bead case of the drill head of the machine tool, it is very expensive to form the pin bore with the required high accuracy of parallelism to the direction of sliding motion of the driving shaft of the horizontal drill head.
Also in the conventional detachable horizontal drill head, since the pin bore is formed in the head case of the drill head, the size of the head case is necessarily increased and thus the overall size of the machine tool is increased.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a structure for detachably mounting a horizontal drill head on a drill head which eliminates the formation of the pin bore in the head case, reduces the manufacturing cost of the head case, and reduces the size of the machine tool by providing a bearing for supporting the guide pin on the sidewall of the head case.
According to the present invention, there is provided a structure for detachably mounting a horizontal drill head on a drill head including a driving spindle rotatably driven by a driving means, a head case for holding the driving spindle above a work table on which the works “W” are placed, and an advancing/retracting means for moving the driving spindle toward and from the work table. The horizontal drill head has a driving shaft connected to the driving spindle and horizontal drills arranged substantially perpendicular to the axial direction of the driving shaft and is characterized in that the horizontal drill head is mounted on the drill head via a guide pin slidable within a bearing mounted on a sidewall of the head case along a direction parallel to the advancing/retracting direction of the driving shaft.
According to the structure of the present invention, since the guide pin slides in the bearing mounted on the sidewall of the head case, it is possible to eliminate the formation of the pin bore in the head case and thus to reduce the manufacturing cost of the head case as well as to reduce the overall size of the machine tool.
It is preferable that the horizontal drill head includes sets of bevel gears for converting the vertical rotation of the driving shaft to horizontal rotation of the horizontal drills.
According to this structure, since the vertical rotation of the driving spindle can be transmitted to horizontal rotation of the drills via the driving shaft and the bevel gears, it is possible to carry out a horizontal drilling operation with a simple mechanical structure.
It is preferable that the horizontal drill head includes two spindles for transmitting the converted horizontal rotation to the drills, the spindles being connected with each other via friction between the taper-shaped joint surfaces formed at the inward ends of the spindles.
According to this structure, the centering of the spindles can be easily attained.
It is preferable that the bearing is mounted on a seat secured on the sidewall of the head case.
According to this structure, since the bearing is mounted on the sidewall of the head case via the seat, it is possible to correct the parallelism between the driving spindle and the guide pin when the horizontal drill head is mounted on the head case by modifying the surface of the seat.
It is preferable that the bearing is adapted to be mounted on the seat via a bearing holder and a mounting member arranged between the bearing holder and the seat that has a step abutted on the top surface.
According to this structure, it is possible to mount the bearing on the sidewall of the head case easily and accurately merely by making the top surface of the bearing holder to be abutted against the step formed on the mounting member.
It is preferable that the horizontal drill head is mounted on the drill head via a guide pin holder arranged between the horizontal drill head and the guide pin, and has a guide pin receiving bore into which the guide pin can be inserted and an opening formed in a portion of the periphery of the guide pin receiving bore, the guide pin holder further including a closing means for closing the opening to secure the guide pin in the guide pin receiving bore after the guide pin is inserted into the bore.
According to this structure, it is possible to easily and firmly secure the guide pin within the guide pin holder.
It is preferable that the guide pin holder is formed with several slits extending radially from the periphery of the guide pin receiving bore.
According to this structure, it is possible to easily insert the guide pin in the guide pin receiving bore.
It is preferable that the guide pin holder is provided with a distance adjusting means for adjusting the distance between the guide pin and the driving shaft.
According to this structure, it is possible to mount the horizontal drill head on the drill head accurately by adjusting the error in the distance between the guide pin and the driving shaft.
It is preferable that the distance adjusting means comprises fasteners for connecting the guide pin holder and the horizontal drill head, and bores through which the fasteners pass so that the position of the fasteners within the bores can be changed based on the distance between the guide pin and the driving shaft.
According to this structure, it is possible to easily adjust the error in the distance between the guide pin and the driving shaft merely by adjusting the position of the fasteners relative to the bores.
Finally, it is preferable that the head case contains a plurality of driving spindles.
According to this structure, it is possible to increase the freedom of layout of the driving spindle relative to the head case.
REFERENCES:
patent: 2669162 (1954-02-01), Arliss
patent: 4614468 (1986-09-01), Waldrich et al.
patent: 4627773 (1986-12-01), Ehnert
patent: 5025548 (1991-06-01), Justesen
patent: 5494088 (1996-02-01), Susnjara
Harness & Dickey & Pierce P.L.C.
Howell Daniel W.
Shoda Iron Works Co., Ltd.
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