JPS6320643B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive device for a workpiece, such as a camshaft, which is centrally supported at both ends.

An object of the present invention is to move the drive engagement member toward an engagement recess such as a keyway by engaging a workpiece shaft end with an engagement surface formed on the drive engagement member. To easily and quickly engage a drive engaging member in a keyway or a pin hole without bothering a worker's hands.

Another object of the present invention is to reduce the number of parts and simplify the structure by supporting the swinging member by a drive pin so that it can swing directly relative to the main shaft.

Conventionally, when driving a center-supported workpiece such as a camshaft, a floating member that can float in the radial direction of the main shaft is further engaged with a driving engagement member that engages with a keyway of the workpiece. A drive device is used in which the driving force of the driving engagement member is offset by the engaging portion so that no pressing force in the radial direction is applied to the workpiece.

Such conventional drive devices are cumbersome because the drive engagement member cannot be engaged with the keyway unless the floating member is manually released in the radial direction when inserting the workpiece, and the automatic There was a drawback that it could not be applied to a loading device.

Furthermore, since the floating member is linked to the main shaft, the movable range of the floating member is reduced, making it difficult to smoothly engage the key, and the number of parts increases, making the structure complex. It was hot.

The present invention has been made in order to solve these conventional drawbacks, and provides a drive device with a simple structure that allows key engagement or pin engagement to be performed easily and quickly using the insertion operation of a workpiece. We aim to provide the following.

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

In Fig. 1, 10 is the bed of the cam grinder;
Reference numeral 12 denotes a table that is moved horizontally on the bed 10 by a table feeding cylinder device (not shown);
Reference numeral 3 denotes a rocking table which is swingably supported on the table 12 by support shafts 14, 14 parallel to the moving direction of the table 12.

A main shaft 15 is rotatably supported on the rocking table 13 in parallel with the moving direction of the table 12, and the main shaft 15 has a pulley 16 fixed to its rear end, a pulley 17 concentric with the support shaft 14, and a pulley 16. , 17, and a rotary drive device 1 consisting of a motor (not shown) connected to the pulley 17, and a belt 18 suspended between the belt 18 and the pulley 17.
9, it is designed to be rotationally driven.

A fixed positioning device 74 for the main shaft 15 is provided at the rear of the main shaft 15 . That is, the main shaft 15
An index plate 75 having a notch on the outer periphery is fitted into the cylinder 76 fixed to the plate 61 on the main shaft frame 51, and a piston 77 is attached to the main shaft 15.
The cylinder 76
By selectively introducing fluid pressure upward and downward, the piston 77 is moved up and down, so that the tip of a piston rod 78 connected to the piston 77 engages and disengages from the notch of the index plate 75. It's getting old.

A master cam 20 is fitted and fixed to the center of the main shaft 15, and a main shaft center 21 (FIG. 3) is fitted to the tip of the main shaft 15 on its axis. A tailstock 22 is mounted and fixed on the upper right end of the rocking table 13, and a tailstock center 24 is attached to a ram 23 of a well-known structure that is moved back and forth by hydraulic pressure and spring pressure.
is fitted concentrically with the spindle center 21, and the workpiece W is supported by both centers 21 and 24.

A face plate 30 is fixed to the tip of the main shaft 15 as shown in FIGS. 2 and 3.
The angular position can be adjusted by loosening the bolt 31. A drive pin 32 is fixed to the front surface of the face plate 30, and this drive pin 32
A swinging member 33 is pivotally supported in a plane perpendicular to the main shaft axis. This swinging member 33
has a U-shape with a portion corresponding to the center 21 cut out, and a pair of holding portions 34, 34 are formed above the U-shape.

As shown in FIG. 4, the holding parts 34, 34 are guided and supported by a pair of guide members 35, 35 which are disposed opposite to each other on both sides of the main shaft 15 across the diameter line thereof. Prevents movement in the axial direction. A connecting plate 37 is fixed to the upper ends of the holding parts 34, 34, and a stopper bolt 36 is screwed onto this. Furthermore, the holding part 34,
34, a drive engagement member 39 having a key 39a is supported by a pivot pin 38 so as to be swingable in a direction intersecting the rotational direction of the workpiece in a plane parallel to the spindle axis. This drive engagement member 39 is the third
As shown in the figure, the tip of the key 39a has a tip engagement surface 40 that is inclined in the direction of the main shaft axis,
When the workpiece W is moved in and out in the direction of the spindle axis, the workpiece shaft engages with this tip engagement surface 40 and swings the drive engagement member 39 about the pivot pin 38, causing the workpiece W to engage. The drive engagement member 39 is adapted to be engaged with and disengaged from the mating recess S, that is, the keyway. Note that 50 is a spring that presses the drive engagement member 39 toward the engagement recess S.

Further, a fixed plate 41 is fixed to the front surface of the swinging member 33, and the drive engagement member 39 is attached to the fixed plate 41 in the circumferential direction of the workpiece W.
An engaging portion 42 is formed at a position different in angular position from the above, and a pressing portion 43 is formed at a position facing the engaging portion 42 across the spindle axis. This one engaging portion 42 comes into contact with the side of the workpiece W as the swinging member 33 rotates counterclockwise, and applies a reaction force F2 to the workpiece W. This reaction force F2
is substantially canceled out by the driving force F1 applied by the drive engagement member 39 to the workpiece W, so that no radial bending moment is applied to the workpiece W. The other pressing portion 43 is elastically deformable by the slit 44, and uses this elastic force to press the workpiece W toward the engaging portion 42,
Even if the direction of action of the grinding resistance changes, the workpiece W does not separate from the engaging portion 42. Furthermore, 45
47 is a spacer that regulates the amount of elastic deformation of the pressing portion 43 to prevent breakage of the elastic deformation portion 46; 47 is a face plate 30;
A support ring 48 is fitted onto the drive pin 32 and is made of a wear-resistant material, allowing the swing member 33 to swing smoothly. In addition, 80 in FIG. 1 is a temporary holder for the workpiece W fixed on the rocking table 13;
1 is a workpiece W fixed to the ram 23 of the tailstock 22
The temporary cradle 82 is a protrusion facing the end surface of the workpiece W on the temporary cradle 81, and is provided in order to pull out the left end of the workpiece W to the left of the drive device when the ram 23 retreats. Further, 85 indicates a well-known automatic loading/unloading device as described in, for example, Japanese Utility Model Publication No. 44-17595.

Next, to explain the operation of the apparatus of the present invention, the figure shows a state in which the workpiece W has been processed by the grinding wheel G, and the main shaft 15 is held at a constant angle with the tip of the piston rod 78 fitted into the index plate 75. Indicates a stopped state.

Next, the ram of the tailstock 22 is retracted by a cylinder device (not shown), the tailstock center 24 is removed from the center hole of the workpiece W, and the projection 82 is moved from the workpiece by the subsequent retraction of the ram 23. Move the workpiece W to the right by pushing the end face of the W, and move the workpiece W from the spindle center 21.
Remove the center hole of the workpiece W and pull it out until the left end of the workpiece W is positioned to the right of the drive device in FIG.
In this state, the workpiece W is supported by the temporary supports 80 and 81. Due to this axial movement of the workpiece W, the drive engagement member 39 retreats in a direction away from the engagement recess S by the action of the tip engagement surface 40 against the repulsive force of the elastic member 50, and the workpiece Since it rides on the outer peripheral surface, the workpiece W can be pulled out smoothly in the axial direction.

The processed workpiece W supported on the temporary supports 80 and 81 is held by the unloading device 85 and moved upward, and then the loading device 85
The unprocessed workpiece W is carried between both centers 21 and 24 with the angular phase of the engagement recess S matched with that of the drive engagement member 39 in advance, and is placed on the temporary cradle 80 and 81.
After being placed on top, it is released from the gripping claws.

After that, the ram 23 moves forward, the tailstock center 24 fits into the center hole of the workpiece W, and further pushes the workpiece W, so that the other center hole of the workpiece W is connected to the spindle center 21.
At the same time, the workpiece W is fitted onto the temporary holders 80, 81.
It rises from above and is supported by both centers 21 and 24. Due to this axial movement of the workpiece W, the workpiece shaft end comes into contact with the tip engagement surface 40, and the key 39a of the drive engagement member 39 is moved against the outer peripheral surface of the workpiece by the action of the tip engagement surface 40. It rides on the top, and then engages with the engagement recess S by the force of the elastic pressure member 40.

When the engagement of the drive engagement member 39 with the engagement recess S is detected by a proximity switch (not shown), the piston rod 78 is disengaged from the index plate 75, and then the main shaft 15 is moved counterclockwise in FIG. When rotated in the direction, this rotation is transmitted to the swinging member 33 via the drive pin 32 on the face plate 30.
This counterclockwise rotation of the swinging member 33 causes the engaging portion 42 to come into contact with the side surface of the workpiece, thereby applying a reaction force F2 to the workpiece W. This reaction force F2 is balanced with the driving force F1 of the drive engagement member 39, and the workpiece W is rotationally driven without applying a moment in the radial direction.

Thereafter, the cam is ground with high precision by moving the grinding wheel G forward and performing a well-known cam grinding cycle.

Note that when inserting the workpiece W into the drive device, if there is a phase shift between the engagement recess S and the drive engagement member 39, the drive engagement member 39 remains on the outer peripheral surface of the workpiece W. However, by rotationally driving the main shaft 15, only the drive engagement member 35 rotates with respect to the stationary workpiece W, and when the phases of the two match, the engagement recess S is moved by the repulsive force of the spring 38. There is no problem as it engages with the

The present invention is not only applicable to the workpiece W having the half-moon-shaped engagement recess S on the front side as described above, but also has a pin on the rear end surface as shown in FIGS. 5 and 6. It is also applicable to a workpiece W having a hole-shaped engagement recess S. In this embodiment, in relation to the difference in the engagement recesses S, the pin-shaped drive engagement member 39 can be moved forward and backward toward the engagement recesses S in a direction parallel to the spindle axis and in a direction intersecting the rotational direction of the workpiece W. The point that the swinging member 33 is fitted and supported by the fitting hole 51 on the swinging member 33 is
This embodiment differs from the previous embodiment in that it is swingably supported by a drive pin 32 located on the same side as the drive pin 32, that a cross-shaped swinging member 33 is used, and that the guide member 35 is constructed as a single piece. , and other basic configurations are substantially the same as those of the embodiment described above, so explanations thereof will be omitted, and those having the same functions as those of the embodiment described above will be designated by the same reference numerals.

According to this embodiment, when the workpiece W is inserted, if the angular phases of the engagement recess S and the drive engagement member 39 match well, the drive engagement member 39 smoothly engages with the engagement recess S; If there is a phase shift between the engagement recess S and the drive engagement member 39, the drive engagement member 39 remains on the end surface of the workpiece W, and then remains stationary by rotating the main shaft 15. The drive engagement member 39 rotates relative to the workpiece W, and when the rotational phases of the drive engagement member 39 and the workpiece W match, the drive engagement member 39 engages with the engagement recess S by the repulsive force of the elastic pressure member 50.

Also, during the rotation of the main shaft 15, the engaging portion 42 comes into contact with the workpiece W, similar to the embodiment described above, and a reaction force F2 of a magnitude almost balanced with the driving force F1 of the drive engaging member 39 is applied. Therefore, the workpiece W can be rotationally driven without applying a moment in the semi-longitudinal direction.

Note that 52 is a detent pin of the drive engagement member 39;
Reference numeral 53 denotes a regulating bolt that regulates the swinging end of the swinging member 33.

Furthermore, although the above embodiment is an example in which the drive device of the present invention is applied to a grinding machine equipped with an automatic loading and unloading device, the present invention is not limited to this, and the present invention is not limited to this. It can also be applied to boards.

As described above, the drive device of the present invention moves the drive engagement member forward and backward by engaging the end of the workpiece shaft with the front end engagement surface of the drive engagement member. The driving engagement member can be engaged with an engagement recess such as a keyway or a pin hole without any trouble, and there is an advantage that automatic loading is possible.

Further, in the drive device of the present invention, the swinging member is swingably supported with respect to the main shaft by the drive pin, and the drive engagement member is movably supported on the swinging member. The abutting operation of the abutting part and the engaging operation of the drive engaging member can accurately and reliably abut or engage at a predetermined location with respect to the workpiece without affecting each other. Since the rocking member only moves in one direction, a drive pin pivot structure can be used, which simplifies the support configuration and allows the rocking member to move in two directions.
There is no need for a complicated connection mechanism that allows for dimensional floating, and the simple structure means that the swinging member and drive engaging member can swing smoothly over a long period of time without being affected by chips, etc. It has the advantage of being able to advance and retreat.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a cross-sectional view of a main part of a cam grinder equipped with a drive device of the present invention, FIG.
The figure is a sectional view taken along the - line arrow in Figure 2, and Figure 4 is a cross-sectional view of Figure 2.
FIG. 5 is a cross-sectional view taken along the line -- in FIG. 1 showing another embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along the line -- in FIG. W...workpiece, S...engaging recess, 15...main shaft, 32
...Drive pin, 33... Swinging member, 39... Drive engagement member, 42... Engagement portion, 50... Resilience member.

Claims (1)

[Claims] 1 A main shaft, a drive pin implanted on the main shaft parallel to the main shaft axis and eccentrically from the center of the main shaft by a predetermined amount, and the drive pin causes the tip of the main shaft to have a first position in a plane perpendicular to the main shaft axis. a swinging member pivotally supported to be swingable in a direction; a swinging member supported on the swinging member to be swingable in a second direction intersecting the rotational direction of the workpiece; and a workpiece engagement recess at the tip thereof. a drive engagement member having a distal end engagement surface that engages with the drive engagement member; a resilient member that applies a force to the drive engagement member in a direction to engage the engagement recess;
and an engagement portion on the swinging member that engages with the workpiece at a position angularly distant from the tip engagement surface of the drive engagement member in the circumferential direction of the workpiece. Characteristic drive device.