JPH0448916Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is capable of automatically setting a forced stopper in machine tools, etc. equipped with a reciprocating moving object to prevent the moving object from overrunning at a turning point. The present invention relates to a forced stopper device for a turning point of a reciprocating motion.

(Prior art) In a machine tool such as a jig grinder, a moving body such as a spindle head that grips a tool reciprocates to machine the workpiece. A stopper is usually provided to prevent overrun. This kind of stoppa is
Conventionally, it is a manual type, and is fixed to the immovable side by screws or the like at the turning point of the movable body.

(Problem to be solved by the invention) According to the conventional stopper device described above, when the stroke of the moving body changes and the turning point moves to a different position, the stopper must be moved to match that position and fixed again. However, the work is quite troublesome, and if you forget to screw the stopper, the moving body may overrun, causing accidents such as damage to the machine or workpiece.

The present invention was developed to solve these conventional problems, and it is possible to automatically fix the stopper of a moving object, and even if there is a change in the turning point of the moving object, the stopper can be automatically fixed in accordance with the change. An object of the present invention is to provide a forced stopper device for a turning point of a reciprocating motion, which can be set automatically.

(Means for solving the problem) As a means for achieving this purpose, this invention includes a stopper piece that is moved to a turning point by the first outgoing movement of a reciprocating moving body, and a stopper piece that is moved to a turning point by the first outward movement of a reciprocating moving body. The present invention is characterized by comprising: a clamp that is activated to fix the stopper piece when the stopper piece is moved to a maximum position; and a drive means that pushes the stopper piece back into contact with the movable body when the clamp is released. be.

(Example) This invention will be specifically explained below with reference to the illustrated example. Reference numeral 1 denotes a moving body such as the spindle head of a jig grinding machine, which is designed to reciprocate in the vertical direction. Reference numeral 2 denotes a stopper piece, which is attached to the tip of a driving means 3 mainly composed of an air cylinder or a hydraulic cylinder, and is adapted to be pushed down by the movable body 1 when it is not fixed at a predetermined position. Reference numeral 4 denotes a clamp, which can clamp and fix the stopper piece 2 when the stopper piece 2 is pushed by the movable body 1 and lowered to an appropriate position.

When setting the stopper piece 2, move the movable body 1 and push down the stopper piece 2, and the stopper piece 2 will move to the clamp 4 at the turning point on the first outward journey.
It is now fixed automatically. FIG. 1A shows the situation when the moving body 1 starts, and the stopper piece 2 is in an unclamped state. Figure B shows the starting position S of the moving body 1.
It shows the state when moving from and reaching the turning point T,
At this time, the clamp 4 operates to clamp the stopper piece 2.

When the stopper piece 2 is clamped in this way, only the moving body 1 returns to the top dead center U as shown in FIG. 1C. From the next stroke, the movable body 1 is always stopped by the stopper piece 2 at the turning point T, thereby preventing overrun and ensuring reciprocating movement between the top dead center and the top dead center U. Become.

Next, when the stroke of the movable body 1 changes and the position of the stopper piece 2 is changed, if the clamp 4 is released, the driving means 3
is activated, and at this time the stopper piece 2 is pushed back and comes into contact with the moving body 1 located at the top dead center U. From this state, if the movable body 1 is moved again with the newly set stroke, the stopper piece 2 will be pushed down by the movable body 1 in the same way as before, and when the movable body 1 reaches the turning point, it will be gripped and fixed by the clamp 4. . Therefore, the position of the stopper piece can be automatically set in this manner.

In the above embodiment, the stopper piece is forcibly set at the bottom dead center of the movable body, but it is also possible to forcibly set the stopper piece at the top dead center of the movable body. That is, as shown in FIG.
1 is pushed down from the start position P, the stopper piece 12 in the unclamped state is lowered, and when the movable body 11 reaches the turning point Q as shown in FIG.
2 is automatically clamped and fixed by the clamp 14. After this, as shown in Fig. 2 C, only the moving body 11 descends and reaches the bottom dead center R, and from the next stroke, the moving body 11 moves between the bottom dead center R and the turning point Q (top dead center). It reliably moves back and forth and is stopped by the stopper piece 12 at the turning point Q, thereby preventing overrun.

Also in this embodiment, as the stroke of the moving body 11 changes, the position of the stopper piece 12 can be automatically set according to the turning point. In the figure, 13 is a drive means for the stopper piece 12, and 15 is a stay attached to the lower end of the movable body 11, which is adapted to engage with the stopper piece 12.

(Effects of the invention) As explained above, according to this invention, the forced stopper can be automatically set at the turning point position during the first stroke of a reciprocating moving object, so that It is possible to prevent run-outs, prevent damage to machines and workpieces, and completely prevent forgetting to engage the stopper.Also, in the case of changing the position of the turning point, the forced stopper can be automatically activated in accordance with the change. It has excellent effects such as significantly improving work efficiency and eliminating the need for any manual equipment.

[Brief explanation of the drawing]

Figure 1 shows an example of this invention.
A is an explanatory diagram showing the starting position of the moving object, B is the turning point of the moving object, C is an explanatory diagram showing the state in which only the moving object has returned to the top dead center, and FIG. 2 shows another embodiment of this invention. A is an explanatory diagram showing the starting position of the moving body, b is a turning point of the moving body, and c is an explanatory diagram showing a state in which only the moving body has returned to the bottom dead center. 1, 11... Moving body, 2, 12... Stopper piece, 3, 13... Drive means, 4, 14... Clamp, 15... Stay, S, P... Start position,
T, Q...turning point, U...top dead center, R...bottom dead center.

Claims (1)

[Scope of utility model registration request] A stopper piece that is moved to a turning point by the first outward movement of a reciprocating moving body, a clamp that operates when this stopper piece moves to the turning point and fixes this stopper piece, and a A forced stopper device at a turning point of a reciprocating motion, comprising a drive means for pushing the stopper piece back into contact with the movable body.