JPS593798Y2 - Grinding wheel front safety cover device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a grinding wheel front protection cover device for a grinding machine.

The purpose of the present invention is to open and close the front cover of the grinding wheel using a part of the stroke of the pusher advance/retreat rod, especially in a grinding machine equipped with a pusher device that presses a workpiece against the chuck body. The operating mechanism is simplified and reliable operation is achieved.

The grinding machine is provided with a grindstone front cover as a security measure to prevent an operator's hands from touching the rotating grindstone and injuring himself when attaching or removing a workpiece.

This grinding wheel front cover avoids interference with the forward and backward movement of the grinding wheel during machining of a workpiece, and only intrudes between the grinding wheel and the side of the chuck when the grinding wheel returns to its original position and attaches/detaches the workpiece. do.

Conventionally, the front cover of the grindstone is opened and closed manually or with a dedicated opening/closing drive cylinder.

The manual opening/closing method is troublesome to operate, and the automatic opening/closing method requires a special cylinder mechanism, resulting in high costs.Also, there is loss time in the responsiveness of opening/closing operations related to the forward and backward movement of the grinding head. It had some problems.

In order to solve this conventional problem, the present invention is designed to automatically open and close the grindstone front cover in conjunction with the operation of the pusher device.

Embodiments of the present invention will be described below with reference to the drawings.

In Figures 1 and 2, 1 is a table, 2 is a headstock installed on the table 1, 3 is a spindle rotatably supported on the headstock 2, and 4 is a chuck fixed to the end of the spindle. It is the main body.

A hydraulic mandrel arbor 5 is attached to this chuck body 4.

Reference numeral 6 denotes a positioning reference surface for the workpiece W, which is pressed against the workpiece W by a pusher device to be described later, and grips the inner diameter of the workpiece W by the outer diameter expanding action of the mandrel arbor 5.

Reference numeral 7 denotes an actuator of the mandrel arbor 5, which expands the oil sealed in the mandrel arbor 5 under the pressing action of a bushing rod 8 that extends vertically through the axis of the main shaft 3 so as to be freely retractable.

The bushing rod 8 is moved forward and backward by an actuating device such as a flashing cylinder.

Reference numeral 9 denotes a pusher device body installed on the table 1 facing the headstock 2.

As shown in FIG. 3, in this pusher device, a cylinder 24 for moving the pusher advancement/retraction rod 10 forward and backward is installed in the pusher device main body 9.

The piston 25 within the cylinder 24 and the pusher reciprocating rod 10 are integrally connected.

A pressing member 12 that presses the workpiece W through a tapered head 11 is connected to the tip of the pusher advancing/retracting rod 10 by tapered fitting, and is constantly pressed by a spring 13 interposed between the pressing member 12 and the holding member 14. The member 12 is pressed and biased in the forward direction.

23 indicates a grindstone.

The present invention provides a grinding machine having the pusher device as described above, which performs three-position control in which the pusher reciprocating rod 10 is stopped at an intermediate position in addition to the retracted position and the forward position.

That is, as shown in FIG. 3, the three-position control is performed by an electromagnetic switching valve 26 formed by 5OL1 and 5OL2.

LSI is a limit switch for confirming the backward position, LS2 for confirming the intermediate position, and LS3 for confirming the forward position.

The above-mentioned pusher advancement/retraction loft 10 is premised on three-position control, and is further equipped with the following security cover mechanism.

A support bracket 15 is protrudingly provided on the side surface of the table 1 (on the equivalent grindstone head side) between the headstock 2 and the pusher device main body 9 and at a position close to the pusher device main body 9 side.

A cover plate 16 is pivotally attached to this support bracket 15 by a pivot 18.

The tip of the cover plate 16 has a length that penetrates between the workpiece W held by the chuck body 4 and the grindstone 23 that has returned to its original position, and the tip of the cover plate 16 has a length that allows it to enter between the workpiece W held by the chuck body 4 and the grindstone 23 that has returned to its original position. An outpost cover 17 is formed which covers the area.

Further, a weight 19 is attached to the rear end of the cover plate 16 for causing the cover plate 16 to pivot upward under its own weight.

Further, a retaining pin 20 is provided in a protruding manner to cause the cover plate 16, which has been pivoted upward, to pivot downward to the shielding position.

On the other hand, an engagement member 22 that engages with the engagement pin 20 only when the pusher advancement/retraction rod 10 retreats backward from the intermediate position is fixed to the pusher advancement/retraction rod 10 .

Reference numeral 21 denotes a stopper provided on the support bracket 15, which restricts the upward pivoting position of the cover plate 16.

Since the present invention has the above-described structure, when the pusher reciprocating rod 10 is located at the backward end, as shown by the solid line in FIG. 1, the engaging member 22 engages with the engaging pin 20, and the cover The plate 16 is turned downward against the upward turning moment by the weight 19, and the front cover 17 is returned to its original position with respect to the workpiece W.

It is located between the grindstone 23 and the grindstone 23 and is in a shielded state.

In this state, the workpiece W is safely carried into and out of the chuck body 4.

The workpiece W mounted on the mandrel arbor 5 of the chuck body 4 is pressed against the workpiece positioning reference surface 6 by a pusher device.

That is, the cylinder 24 of the pusher device main body 9 is operated to advance the pusher reciprocating rod 10 to the forward position.

As a result, the pressing member 12 comes into contact with the workpiece W and presses against the reference surface 6.

As the pusher reciprocating rod 10 moves forward, the retaining member 22 also moves forward.

Therefore, the engaging pin 20 that has been engaged with the retaining member 22 is separated from the engaging member 22, and when the retaining member 22 advances further forward from the intermediate position, the retaining pin 20 is completely engaged with the retaining member 22.
0, the cover plate 16 pivots upward due to the gravity of the weight 19, and the upward pivoting position is regulated by the stopper 21.

In other words, the front cover 17 allows the grindstone 23 to move forward by making a large avoidance swing from between the workpiece W and the grindstone 23.

After the pusher rod 10 has completed pressing the workpiece W against the reference surface 6, it moves backward, but its retreating position stops at the mid-dipping position until the machining of the workpiece W is completed and the grindstone 23 returns to its original position. maintain.

This is because when the pusher advancing/retracting rod 10 is positioned at the retreating end all at once, the engaging member 22 engages with the engaging pin 22 to pivot the cover plate 16 downward, and the front cover 17 obstructs the forward movement of the grindstone 23. This is because it is necessary to stop the engaging member 22 at an intermediate position where it does not engage with the engaging pin 20 and to hold the cover plate 16 in the upper avoidance position.

Therefore, upon completion of machining the workpiece W and return of the grindstone 23 to its original position, the pusher advance/retreat rod 10 retreats from the intermediate position to the retreat position, and the retreat action causes the cover plate 16 to pivot downward to place the front cover 17 in the shielding position. The work of attaching and detaching the workpiece W is performed.

As described above, the device of the present invention uses a simple mechanism to open and close the cover that enters between the workpiece and the grindstone that is returning to its original position in conjunction with the forward and backward movement of the pusher device of the workpiece. Because of this, there is no need for a special opening/closing device such as a dedicated cylinder, and it automatically opens and closes when necessary, ensuring safety when attaching and detaching workpieces.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the main parts of the device of the present invention, and Figure 2 is Figure 1 I.
A sectional view taken along the line I-II and FIG. 3 are explanatory diagrams of the operating mechanism of the pusher device. 1...table, 2...headstock, 3.
...Main shaft, 4...Chuck body, 9...
... Pusher device main body, 10 ... Pusher advancement/retraction rod, 12 ... Pressing member, 15 ...
...Support bracket, 16...Cover plate,
17...Front cover, 18...Pivot,
19... Weight, 20... Engagement pin, 2
1...stopper, 22...engaging member,
23...Whetstone.

Claims (1)

[Scope of utility model registration request] In a grinding machine in which a pusher device that presses a workpiece against a chuck body at the end of the spindle is placed on a table facing the headstock, a cover plate is swingably pivoted to a support bracket fixed to the side of the table. A front cover is provided at the tip of the cover plate to intrude and shield between the grindstone that has returned to its original position and the side of the chuck body, and at the rear end of the cover plate, the front cover is usually avoided upward by its own weight. A weight and an engagement protrusion for downward rotation are attached to the pusher advance/retreat rod of the pusher device, and the pusher engages with the engagement protrusion only when the pusher advance/retreat rod moves rearward from an intermediate position to a rearward end. 1. A grindstone front safety cover device, characterized in that a retaining member is provided for pivoting the front cover downward, and the pusher advancing/retracting rod can be stopped at an intermediate position when retracting.