JPS618260A - Fixed length head driving gear - Google Patents

Abstract

PURPOSE:To improve the supporting rigidity of a fixed length head for measuring the machining diameter by performing the attitude control while stretching a guide bar between a fixed length head supported rotatably and the pivot shaft of head supporter. CONSTITUTION:Upon machining of a work W to fixed dimension, the grinding wheel table will retract while simultaneously the movable shafts 23, 24 of a fixed length head 20 will move in the opposite directions to displace the contractors 21, 22 in the direction departing from the work W thus to turn the rotary shaft 16 and the turning arm 17 to the left through rotary drive. The fixed length head 20 will turn along an arched orbit C together with a pivot shaft 18 thus to separate the contactors 21, 21 from the work W. Here, the fixed length head 20 will lift along a guide bar 33 while maintaining such angular position as the center of the guide hole 34 will cross with the axis of the pivot shaft 31 and upon turning of said arm 17 by predetermined angle to bring said head 20 to the end of lift, said head 20 is maintained in approximately same angular position with that at the measuring position and waits.

Description

[Detailed description of the invention] <Industrial application field> The present invention is for sizing to measure the machining diameter of a workpiece.

The present invention relates to a sizing head driving device that moves a sizing head between a measurement position and a retreat position, and changes the measurement position of the sizing head depending on the processing position of a workpiece.

<Prior art> A sizing device that measures the machining diameter of a workpiece is designed to release the sizing head from the measurement position to a retracted position in order to attach or remove the workpiece. It is broadly divided into two types. Among these, the rotating type sizing device has the advantage that the sizing head is retracted upward, making it easier for the operator to attach and detach the workpiece.

Generally, a rotating type sizing device supports a sizing head 1 by a parallel link mechanism 2, as shown in FIGS. 4 and 5.
By rotating the drive link 3 of the parallel link mechanism 2, the sizing head 1 is reciprocated between the measurement position and the retreat position while maintaining a constant angular posture.

<Problems to be Solved by the Invention> However, in this type of device, the two parallel links of the parallel link mechanism 2, that is, the driving link 3 and the driven link 4, are shifted in the direction of the rotation axis so that they do not interfere with each other. As a result, the overhang of the sizing head 1 increases, resulting in a disadvantage in terms of space.Especially in the case where the sizing head I is moved in the axial direction according to the machining position of the workpiece, The increase in the amount of overhang may cause problems in terms of rigidity.

Means for Solving the Problems> The present invention has been made to solve the above problems, and includes a head support that rotatably supports a swivel arm, and a sizing head rotatably supported on the swivel arm. A guide bar for controlling the attitude of the sizing head is spanned between this sizing head and a pivot shaft pivotally supported by the head support.

<Operation> With the above configuration, when the swing arm is rotated, the sizing head' is raised and lowered along an arcuate trajectory, and the angular attitude of the sizing head I'' is regulated by the guide bar.

<Example> Embodiments of the present invention will be described below based on the drawings.

In FIGS. 1, 2, and 3, reference numeral 10 indicates a support stand, and this support stand 10 is fixed to a fixed head 1) that is attached to a fixed part such as a belly button F of a grinding machine. A ram 12 and a pilot bar 13 are respectively fitted to the support base 10 so as to be slidable along the axial direction of the workpiece W.
and a head support 14 at the tip of the Pyro 7 bar 13.
is fixed. A rotary shaft 16 formed with a spline 15 is rotatably supported on the head support 14 around an axis parallel to the sliding direction of the ram 12, and this rotary shaft 16 is rotatably and slidably supported on the support base 10. possible to be mated.

A rotating arm 17 is fixed to the tip of the rotating shaft 16,
A pivot shaft 18 is rotatably supported on this swing arm 17 at a position offset by a predetermined amount from the axis of the rotation shaft 1 [; and rotatably around an axis line ip to the rotation shaft 12. A sizing head 20 is fixed to. The sizing head 20 has a pair of movable shafts 23 each having contactors 21 and 22 attached thereto, which contact two points on the diameter line of the workpiece W.
．． 24 are provided so as to be relatively displaceable in directions opposite to the shingle, and the diameter of the workpiece W is measured by a displacement detector (not shown) based on the relative displacement of these movable shafts 23 and 24.

A rotation sleeve 25 is attached to the support base 10 and the rotation shaft 16 is connected to the rotation sleeve 25.
The rotary sleeve 25 is rotatably supported on the same axis as the rotary shaft 16, and the rotary sleeve 25 is spline-engaged with a spline 15 formed on the rotary shaft 16 so as to be able to move only in the relative axial direction. A gear 26 is fixed to the rotating sleeve 25, and this gear 26 is rotationally connected to a rotation driving means such as a rotary shilling (not shown).
The rotation arm 17 is rotated between the lower rotation end and the upper rotation arm 1 by the operation of the rotation drive means.

A feed screw shaft 27 is also rotatably supported on the support base 10 on the same axis as the ram 12.
is screwed into a feed nand 28 fixed to the ram 12. A gear 29 is provided at one end of the feed screw shaft 27, and this gear 29 is rotationally connected to a feed motor (not shown), so that the head support 14 is moved in the axial direction of the workpiece W by the operation of the feed motor. ing.

Further, a pivot shaft 31 is rotatably supported on the support base 10 around an axis parallel to the rotation shaft 16.
A guide hole 32 is penetrated in the diametrical direction at the tip. A guide bar 33 is slidably fitted into the guide hole 32.
One end of this guide bar 33 is fitted and fixed into a guide hole 34 provided in the sizing head 20.

In addition, numeral 35 in the figure indicates a stopper provided on the support base 10, and the stopper 35 restricts the downward swing end of the swing arm 17.

Next, the operation in the above configuration will be explained. 1st
In the figure, when the size of the workpiece W reaches a fixed size, the cutting of the unillustrated grindstone head is stopped, and the grindstone head is moved back in rapid motion. At the same time, the pair of movable shafts 23, 24 of the sizing head 20 are moved in opposite directions,
The contacts 21, 22 are displaced away from the workpiece W. Subsequently, the rotary drive means of the enclosure is activated, and the rotary axis I
6 and the pivot arm 17 is pivoted counterclockwise in FIG. Due to the pivoting of the pivot arm 17, the sizing head 20 is pivoted together with the pivot shaft 18 along an arcuate trajectory C centered on the rotating shaft 16, and the contacts 21 and 22 are removed from the workpiece W. In this case, the sizing head 20 is raised while being held in an angular position where the center of its guide hole 34 intersects with the axis of the pivot 31 due to the guiding action of the guide bar 33. When the swing arm 17 is rotated by a predetermined angle and the sizing head 20 reaches the rising end, the sizing head 20
0 is kept in almost the same angular attitude as the measurement position, and waits in that state.

Note that when the machining position of the workpiece W is changed, the feed motor of the enclosure is controlled to change the measurement position of the sizing head 20 accordingly, and the head support 14 is moved through the feed screw shaft 27. is displaced in the axial direction of the workpiece W.
- In the above embodiment, the guide bar 33 is fixed to the sizing head side and slidably guided to the pivot 31, so the guide bar 33 is raised together with the sizing head 20, and the guide bar 33 is moved up to the sizing head 20. Although there is an advantage that the work space can be made wider at the rising end position of the guide bar 33, it is of course possible to fix the guide bar 33 to the pivot side and slidably guide it to the sizing head side. be.

<Effects of the Invention> As described above, the present invention provides a structure in which a sizing head is rotatably supported on a swing arm that is rotatably supported on a head support, and a sizing head is rotatably supported on a swing arm that is rotatably supported on a head support. The configuration is such that the posture of the sizing head is controlled by passing the guide bar between the head support and the sizing head. The interval is reduced, which is advantageous in terms of space, and the amount of overhang of the sizing head relative to the support base can be reduced, which has the effect of increasing the support rigidity of the sizing head.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall view showing the sizing head drive device, FIG. Cross-sectional view along the m-■ line, No. 4
FIG. 5 and FIG. 5 are diagrams showing a conventional example. IO...Support stand, 14...Head support, 16...
・Rotating axis, 17... Swivel arm, 18... Pivot axis, 20... Sizing head, 31... Pivot, 33...
・Guide bar.

Claims (2)

[Claims] (1) A head support is supported on a support stand so as to be movable in the axial direction of the workpiece whose machining diameter is to be measured, and a swing arm is attached to the head support to rotate around an axis parallel to the moving direction of the head support. a sizing head is pivotally supported on the swivel arm so as to be swingable about an axis parallel to the swivel axis of the swivel arm, a bar guide is provided on the sizing head, and a bar guide portion is provided on the sizing head; A pivot is rotatably supported around an axis parallel to the pivot axis of the pivot arm, a bar guide section is provided on the pivot, and a guide bar is fixed to one of the bar guide sections between the two bar guide sections. , a sizing head drive device which is slidably spanned over the other bar guide section. (2) The sizing head driving device according to claim 1, wherein the guide bar is fixed to a bar guide portion of the sizing head and slidably fitted to the bar guide portion of a pivot shaft.