JPH0716884Y2 - Locking mechanism of stroke adjusting screw in rodless cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a lock mechanism for a stroke adjusting screw in a rodless cylinder.

[Prior Art] With the recent miniaturization of various devices, small rodless cylinders have been required, but the axial length of the rodless cylinder is determined by the stroke of the workpiece. It is necessary to reduce the height of the cylinder body and the mover that moves along the cylinder body.

On the other hand, the rodless cylinder is used to adjust the stroke of the moving element or to absorb the impact caused by a collision.
As shown in the figure, the screw holder 1 is fixed in the width direction of the cylinder body (direction orthogonal to the moving direction of the mover), and the stroke adjusting screw 2 such as a stopper bolt or shock absorber is screwed to the screw holder. The stroke adjusting screw 2 is moved forward and backward with respect to the screw holder 1 to adjust the stroke of the moving element, and the position is locked by the lock nut 3.

However, as shown in FIG. 5, the lock nut 3 needs an outer diameter B corresponding to the thread diameter of the stroke adjusting screw 2. Therefore, if the height of the screw holder 1 becomes low due to the downsizing of the mover, the lock nut 3 will be locked. The nut 3 is the height A of the screw holder 1.
Since it becomes higher (see FIG. 4) and hinders the movement of the work, the size of the lock nut 3 may hinder the downsizing of the rodless cylinder.

[Problems to be Solved by the Invention] An object to be solved by the present invention is to provide a lock mechanism for a stroke adjusting screw, which enables a rodless cylinder to be small in size and which is hard to loosen.

[Means for Solving the Problems] In order to solve the above problems, a lock mechanism for a stroke adjusting screw in a rodless cylinder of the present invention includes a screw holder fixed to a cylinder body of the rodless cylinder, and a screw attachment to the screw holder. In a rodless cylinder including the stroke adjusting screw and the lock mechanism for the stroke adjusting screw, a lock plate in which the lock mechanism is screwed onto the stroke adjusting screw, and a bolt for tightening the lock plate to the screw holder are provided. It is characterized by being configured with.

[Operation and Effect of Invention] When the lock plate is screwed into the stroke adjusting screw screwed to the screw holder, a slight gap is created between the screw holder and the lock plate due to the mismatch of the screw thread tips of these screw holes. It is formed.

Therefore, when the lock plate is tightened to the screw holder with the bolt, the lock plate slightly bends with the threaded portion of the stroke adjusting screw as the apex, so an axial force is generated in the stroke adjusting screw, and this force causes the stroke adjusting screw to move. Locked.

Since the lock mechanism locks the adjusting screw by the axial force generated in the stroke adjusting screw itself, even if the moving element moving in the same direction repeatedly collides, the lock does not loosen.

Also, unlike the lock nut, the stroke adjusting screw can be locked even if the height of the lock plate is lowered, so that the height of the mover or the like can be reduced, and thereby the rodless cylinder can be downsized. .

The stroke of the rodless cylinder can be adjusted by releasing the tightening of the lock plate with the bolt and moving the stroke adjusting screw forward and backward with respect to the screw holder.

[Embodiment] A rodless cylinder 10 schematically shown in FIG. 3 includes a moving element 12 that moves along an upper surface of a cylinder body 11 and the moving element 12.
Shock absorber 13 for adjusting the stroke of
A stroke adjusting screw described later such as a stopper bolt 14 and the like is provided.

The rodless cylinder 10 has end plates 16 and 16 on both sides of the cylinder body 11, and the mover 12 moves integrally with the piston (not shown) that reciprocates in the cylinder body 11. .

In the rodless cylinder, the structure in which the piston and the mover are integrally moved is to provide a plurality of magnet rows that attract each other, and to form the piston and the mover in the longitudinal direction of the cylinder body. It is known that the rodless cylinder of the present invention is connected by a connecting member that passes through the slit, but any of these may be used.

In the cylinder body 11, the screw holders 17, 17 are attached to a mounting bracket (not shown) and bolts 19 ... that are screwed to the mounting bracket, so that the width direction of the cylinder body 11 (direction orthogonal to the moving direction of the mover 12). ), Female screw 17a of each screw holder 17
Stroke adjusting screws 20, 20 such as a shock absorber 13 and a stopper bolt 14 are screwed to (see FIG. 1).

A lock plate 21 is screwed to the end plate 16 side of each of the stroke adjusting screws 20, and the lock plate 21 has cap bolts 22, 22 passing through bolt holes 21a, 21a near both ends in the longitudinal direction.
Tighten the screw holder 17 by the lock plate 21
Stroke adjusting screw 2
A zero lock mechanism 24 is configured.

Since the lock mechanism 24 locks the adjusting screw 20 by the axial force generated in the stroke adjusting screw 20 itself, even if the moving element 12 moving in the same direction repeatedly collides, the lock is kept. It does not come loose.

Unlike the lock nut, the lock plate 21 can be made low in height, so that it can be prevented from protruding from the height A of the screw holder 17 even if the height of the moving element 12 is low (see FIG. 2). Therefore, the lock mechanism 24 does not hinder the downsizing of the rodless cylinder 10.

In this case, in order to generate an axial force of the stroke adjusting screw 20 on the lock plate 21 by tightening the cap bolts 22, 22, it is necessary that there is a slight gap between the screw holder 17 and the lock plate 21. However, since the screw holder 17 and the tip of the screw thread of the lock plate 21 do not usually match, if the lock plate 21 is brought into contact with the screw holder 17 and the stroke adjusting screw 20 is screwed onto them, there will be a gap between them. Is formed.

However, since the tips of the two screw threads may coincide with each other by chance, the thickness of the lock plate 21 may be different from the integral multiple of the screw pitch. This way,
If the tips of the threads are accidentally aligned, lock plate
When the stroke adjusting screw 20 is screwed by reversing the screw 21, a gap is formed between the screw holder 17 and the lock plate 21.

Use the stroke adjustment screw 20 to release the tightening of the lock plate 21 with the cap bolts 22 and 22,
The stroke of the moving element 12 can be adjusted by moving the moving element 12 forward and backward.

After adjusting the position of the stroke adjusting screw 20,
When the lock plate 21 is tightened to the screw holder 17 with 2, 22, an axial force of the stroke adjusting screw 20 is generated in the lock plate 21, and this force causes the stroke adjusting screw 20 to move.
Is locked.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view showing an essential part of an embodiment of the present invention, and FIG.
The figure is a vertical sectional front view, FIG. 3 is a plan view showing a state of being attached to a rodless cylinder, FIG. 4 is a vertical sectional front view of a known lock mechanism, and FIG. 5 is a plan view of a lock nut. 10 …… Rodless cylinder, 11 …… Cylinder body, 17…
… Screw holder, 20 …… Stroke adjusting screw, 21 …… Lock plate, 22 …… Cap bolt, 24 …… Lock mechanism.

Claims (1)

[Scope of utility model registration request] 1. A rodless cylinder comprising a screw holder fixed to a cylinder body of a rodless cylinder, a stroke adjusting screw screwed to the screw holder, and a lock mechanism for the stroke adjusting screw, wherein the lock mechanism is provided. A lock mechanism for a stroke adjusting screw in a rodless cylinder, comprising: a lock plate screwed onto the stroke adjusting screw; and a bolt for tightening the lock plate to the screw holder.