JPH0171004U - - Google Patents

Description

[Brief Description of the Drawings] Fig. 1 is a longitudinal sectional side view of the essential parts of an embodiment of the device of the present invention, in which the upper half from the central axis shows the tool clamped state, and the lower half shows the tool unclamped state. ing. FIGS. 2 and 3 are longitudinal sectional front views taken from the lines - and - in FIG. 1, and FIG. 4 is a schematic configuration diagram of the entire main shaft drive device. A...Main shaft, B...Main shaft motor, C...Clutch, D...Gear reduction means, E...Drawbar, F
...Positioning nut, G...Sliding ring, H...Connecting pin, I...Piston for tool unclamping,
J...Counter piston, K...Cylinder, L...
...Spindle head, 14... Spring, 15... Engaging protrusion, 2
1... Engagement recess.

Claims (1)

[Claim for Utility Model Registration] A spindle whose outer diameter surface becomes smaller toward the rear end and is rotatably supported within the spindle head, and a spindle which is disposed coaxially with the spindle in the spindle head facing the rear end of the spindle. The main shaft motor is installed between the rear end of the main shaft and the output shaft of the main shaft motor so that it can be engaged and disengaged, and is retained within the spindle head during maintenance of the main shaft, allowing the main shaft to be inserted and removed.
A clutch that drives the main shaft at high speed, a gear reduction means that drives the main shaft at low speed through a group of reduction gears from the main shaft motor when the clutch is disengaged, and a gear reduction means that is slidably inserted into the main shaft and is always biased backward by a spring. a drawbar; a positioning nut that is fixed to the outer diameter surface of the main shaft in front of the clutch mounting position and has engaging protrusions formed at equidistant positions on the outer diameter surface; and an outer diameter surface of the main shaft between the clutch and the positioning nut. A sliding ring is slidably disposed on the top and has an outer diameter smaller than the engaging protrusion of the positioning nut, and the sliding ring and the drawbar are connected to each other by passing through an elongated hole in the axial direction of the main shaft. A connecting pin is arranged on the outside of the sliding ring so that it can slide in the axial direction of the main shaft, and when the tool is unclamped, it comes into contact with the rear end of the sliding ring and the sliding ring engages the positioning nut. A tool unclamping piston that presses the drawbar forward of the main shaft against a spring until it abuts, and a piston for unclamping the tool, which is disposed on the outside of the positioning nut so as to be able to slide in the axial direction of the main shaft, and the engagement protrusion of the positioning nut. It has an inner diameter surface that is smaller in diameter than the outer diameter and slightly larger than the outer diameter of the sliding ring body, and when aligned in the rotating direction of the main shaft corresponding to the engagement protrusion, it can be positioned together with the main shaft. a counter piston having an engaging recess on its inner diameter surface through which a nut can pass, and which abuts and engages with the front end of the positioning nut to receive the reaction force of the tool unclamping piston when the tool is unclamped; a cylinder that is fixed to the cylinder, slidably engages the pistons, moves the pistons toward each other when the tool is unclamped, and moves the pistons away from each other when the tool is clamped; A spindle device for a machine tool, characterized by comprising: