JPH0365636U

JPH0365636U -

Info

Publication number: JPH0365636U
Application number: JP12567289U
Authority: JP
Priority date: 1989-10-30
Filing date: 1989-10-30
Publication date: 1991-06-26

Description

[Brief explanation of drawings]

第１図は本考案の一実施例の全体構造を示す一
部軸断面図、第２図および第３図は油圧シリンダ
による通常の上下送り状態を示す一部軸断面図、
第４図および第５図はサーボモータによる送り時
におけるオーバストローク時の対応状態を説明す
るための一部軸断面図。１……空圧シリンダ、２……第２のピストン、
３……第１のピストン、３ａ……突出部、４……
上方室、５……下方室、６，７……開口部、８…
…上端面、９……下端面、１０……油圧シリンダ
、１２……上蓋、１３……下蓋、１４……ピスト
ン、１７……砥石台、２０……空気源、２１，２
２……エアハイドロコンバータ、２９……サーボ
モータ、３１……ボールねじ、３２……ボールね
じナツト、３３……クラツチ、３４……ＮＣ制御
装置、３５，３６……リミツトスイツチ、３７…
…砥石。 FIG. 1 is a partial axial sectional view showing the overall structure of an embodiment of the present invention, FIGS. 2 and 3 are partial axial sectional views showing the normal vertical feeding state by a hydraulic cylinder,
FIGS. 4 and 5 are partial axial sectional views for explaining how to cope with overstroke during feeding by the servo motor. 1... Pneumatic cylinder, 2... Second piston,
3...first piston, 3a...protrusion, 4...
Upper chamber, 5... Lower chamber, 6, 7... Opening, 8...
...Upper end surface, 9...Lower end surface, 10...Hydraulic cylinder, 12...Upper lid, 13...Lower cover, 14...Piston, 17...Whetstone head, 20...Air source, 21,2
2... Air-hydro converter, 29... Servo motor, 31... Ball screw, 32... Ball screw nut, 33... Clutch, 34... NC control device, 35, 36... Limit switch, 37...
...Whetstone.

Claims

[Scope of utility model registration request]

In a cylinder stroke end variable mechanism for moving a moving body by a predetermined stroke length, in which a two-system feeding device of a hydraulic cylinder, an NC-controlled servo motor, and a ball screw are connected directly and via a clutch, on the cylinder,
A first moving simultaneously with the piston of the hydraulic cylinder.
A pneumatic cylinder is equipped with a piston having a built-in piston and a stroke length that is at least the predetermined stroke length plus an allowance stroke length. a second piston is disposed at a position separated by a distance of 100 mm, and the first piston contacts the upper end surface of the pneumatic cylinder when the piston of the hydraulic cylinder is at the upper end of its stroke; A cylinder stroke end variable mechanism characterized in that an opening connected to an air source is provided in the upper and lower chambers of the pneumatic cylinder defined by the second piston when the cylinder is at the lower end.