JPS632282Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a work rest, and more particularly to a work rest in which a lower shoe can be moved in conjunction with the swing movement of a swing arm that swings around a pivot in a vertical plane.

When grinding a workpiece, it is known to set a work rest near the part of the workpiece to be machined. Furthermore, if the workpiece is a crankshaft, it is necessary to move the work rest shoe back significantly when indexing the table. FIG. 1 shows an example of a conventional work rest, in which a swinging arm 2 is pivotally supported by a pivot 3 to a fixed frame 1, and an upper shoe 4 is held at the front end of the swinging arm 2. There is. On the other hand, a lower shoe 5 is pivotally supported on the swing arm 2 by a pivot 6.
transmits the movement of the pressing cylinder device 7 to the intermediate lever 8, which moves the drive rod 9 via the cam roller R and the cam groove G, whereby the lower shoe 5 is pivoted. There is. Also,
The swing arm 2 is adapted to be driven by a swing cylinder device 10.

However, such conventional work rests have a complicated link mechanism for driving the lower shoe, requiring a large number of links and levers, and pins for pivotally connecting them. There were problems in that troubles caused chatter or that the lower shoe could not be operated quickly.

SUMMARY OF THE INVENTION An object of the present invention is to provide a work rest that eliminates the cam device for releasing the lower shoe and simplifies the motion transmission mechanism so that the lower shoe can be moved quickly.

In order to achieve this purpose, the work rest according to the present invention includes a fixed frame, a swinging arm whose lower end is pivotally supported with respect to the fixed frame and is swingable, and the swinging arm is driven to swing. A driving cylinder device, an upper shoe held at the free end of the swinging arm, and a lower shoe rotatably pivoted on the fixed frame to extend toward the workpiece while the driven arm is rotated in the opposite direction. a lower steady rest extending in the direction; and a pair of drives provided on the swing arm side and acting on the driven arm to provide rotational motion to the lower steady rest in conjunction with the swing motion of the swing arm. It is characterized by comprising a roll.

An embodiment of the work rest according to the present invention will be described below with reference to FIGS. 2 and 3.

In FIG. 2, reference numeral 11 indicates a fixed frame fixed to the bed, and a swinging arm 13 which is swingable via a pivot shaft 12 is pivotally attached to this fixed frame 11. The operating arm 1 is attached to the pivot 12.
A piston rod 16 of a drive cylinder device 15 is attached to the tip of the operation arm 14.
The operating end of the is connected. Therefore, the swing arm 13 can be swung in the vertical plane by the operation of the drive cylinder device 15, and its most advanced position is achieved by the stopper pin 17 coming into contact with the stopper 18 on the fixed frame 11 side. It's becoming regulated. Further, an upper shoe 20 that can pivot about a shaft 19 is pivotally attached to the upper front end of the swing arm 13, and this upper shoe 20 acts to press the workpiece 21 toward the grinding wheel 22. . A minute feed device 23 is provided on the back side of the upper shoe 20 so that the amount of advance of the upper shoe 20 can be finely adjusted.

Further, on the front surface of the fixed frame 11 and below the stopper 18, a jaw portion 24 is provided protrudingly, and a lower steady rest 25 is rotatably supported on the jaw portion 24 so as to be rotatable around a pivot shaft 26. . The lower steady rest 25 includes a lower shoe 27 that can extend downwardly from the workpiece 21, a driven arm 28 that extends in the opposite direction, and a fine adjustment arm 29. The driven arm 28 of the lower steady rest 25 follows and interlocks with the swinging motion of the swinging arm 13. In this embodiment, the pair of drive rolls 30 and 31 move along the swinging arm 28.
It has come to act on That is, in conjunction with the swinging movement of the swinging arm 13, the drive roll 3
0 and 31 engage with the driven arm 28 to rotate the lower steady rest 25 about the pivot shaft 26.

Further, a minute feed device 32 is provided on the front surface of the swing arm 13, and the tip of this device 32 acts on the fine adjustment arm 29 of the lower steady rest 25 to give a minute feed to the lower shoe 27. It's getting old.

Next, the operation of the work rest described above will be described.

FIG. 3 shows the work rest 1 relative to the workpiece 21.
3 is shown before the piston rod 16 of the drive cylinder device 15 is extended,
The swing arm 13 is pivoted to the pivot point 1 via the operating arm 14.
2 to the illustrated position, the drive rolls 30 and 31 act on the driven arm 28 of the lower steady rest 25 to rotate it around the pivot 26, and the lower shoe 27 retreats below the workpiece 21. Indicates the condition. To set the work rest on the workpiece 21 from this state, the piston rod 16 of the drive cylinder device 15 is retracted, the swing arm 13 is tilted toward the workpiece 21 via the operation arm 14, and the stopper pin 17 is set against the stopper pin 17. The swing arm 13 is fixed at the position where it abuts against the swing arm 18. During this forward tilting movement of the swing arm 13, the drive roll 3
0 and 31 act on the driven arm 28 to rotate the lower steady rest 25 about the pivot 26 in the clockwise direction in the figure. Therefore, the lower shoe 27 approaches the workpiece 21 from below and stops just before contacting the workpiece 21. This state is shown in FIG. 2, and finally, the minute feed device 23 is driven to press the upper shoe 20 toward the workpiece 21, and the minute feed device 32 is driven to cause the lower part to run out. The stop 25 is rotated a small amount around the pivot 26 to adjust the degree of pressure contact of the lower shoe 27. In this way, the upper
By appropriately adjusting the pressing force of the lower shoe 27 and the lower shoe 27, grinding can be performed under appropriate conditions.

As described above, according to the present invention, the drive roll acts on the driven arm of the lower steady rest in conjunction with the swinging movement of the swinging arm, so that the lower shoe approaches the workpiece. , the complicated device for driving the lower shoe is omitted, and the intermediate link mechanism, cam roller, and cam groove for transmitting motion are no longer required, and the upper shoe and lower shoe can be easily connected to the workpiece. can be set quickly.

[Brief explanation of the drawing]

Figure 1 is a side view showing a conventional work rest.
FIG. 2 is a side sectional view showing the work rest according to the present invention set to a workpiece, and FIG. 3 is a side sectional view showing the work rest released from the set. 11... fixed frame, 12... pivot, 13...
... Swing arm, 15 ... Drive cylinder device, 20
...Upper shoe, 21...Workpiece, 25...Lower steady rest, 26...Pivot, 27...Lower shoe,
28...Followed arm.

Claims (1)

[Scope of utility model registration request] a fixed frame, a swinging arm whose lower end is pivotally supported with respect to the fixed frame so as to be swingable, and a drive cylinder device for swinging the swinging arm;
An upper shoe held at the free end of the swing arm and a lower shoe rotatably supported on the fixed frame extend toward the workpiece, while the driven arm extends in the opposite direction. a lower steady rest provided on the swing arm side, and a pair of drive rolls that act on the driven arm to provide rotational motion to the lower steady rest in conjunction with the swing motion of the swing arm. A work rest.