JPH01271127A - Expansion shaft with locking key - Google Patents

Abstract

PURPOSE:To prevent the sliding of a cutter by a large rotational torque by providing three uniform semi-circular grooves on the sleeve of an expansion shaft and inserting a round bar key by providing an uniform semi-circular groove on the cutter. CONSTITUTION:The semicircular groove 2 divided into three equal parts is provided on the sleeve 1 of the expansion shaft on which center shaft 7 the sleeve 1 is provided. On the other hand, the semi-circular groove 4 divided in equal three parts is provided on the cutter 3 to be inserted into the expansion shaft as well and a round bar shaped key 5 is inserted to the round hole composed of the semicircular grooves 2, 4. When an oil pressure is press-fitted into an oil groove 6, a gap is made zero with the sleeve 1 being expanded and brought into contact with the circular hole face of the cutter 7 and its expansion is made in a triangular shape with the thinned three semicircular grooves 2 of the sleeve 1 as the apex. The sliding between the cutter 3 and sleeve 1(expansion shaft) is prevented even if a large rotational torque is exerted on the cutter 3 together with the key 5.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a spacerless slitter using an expansion/contraction shaft. More specifically, in recent years, the arbor shaft of a slitter has been made into a double shaft by fitting a sleeve around the outer periphery of the shaft, pressurizing hydraulic pressure into the gap between the shaft and the sleeve, and expanding the outer sleeve shaft to increase the outer diameter. This invention relates to a spacerless slitter that holds the cutter by tube expansion force and positions and fixes the cutter by eliminating a sleeve between the cutters.

<Conventional technology> Spacer-less slitter has conventionally expanded the double shaft and fixed the cutter by the expansion force, but when the cutting torque becomes large, the cutter may not be held by the frictional force between the cutter and the shaft alone. There was a problem where the shaft and cutter sometimes slipped. In particular, if a large tensile force was applied to the plate being cut while the line was being started, the cutter would sometimes slip.

<Problems to be Solved by the Invention> After the cutter is fixed to the shaft by tube expansion force, the cutter is prevented from slipping on the C-axis and idling due to the cutting torque.

Means for Solving the Problems> A semicircular groove is provided on the cutter and the shaft, and a round bar-shaped key is inserted into the cutter and shaft to prevent rotation. In addition, keyways are provided at three equal locations, and the shaft is expanded into a triangular rice ball shape, and the cutter is constructed so that the keyways are located at three equal locations.

<Example> Three semicircular grooves 2 are provided on an expansion/contraction shaft with a sleeve 1 provided on the central shaft 7. A cutter 3 inserted into one shaft is provided with three semicircular grooves 4, and a round bar-shaped key 5 is inserted into the round hole formed by the semicircular grooves 2 and 4.

<Operation> When hydraulic pressure is applied to the oil groove 6, the sleeve 1 expands. The sleeve 1 expands and comes into contact with the inner hole surface of the cutter 3, making the gap between the cutter 3 and the shaft sleeve 1 O, and the tube expands at the three points of the semicircular groove 2, that is, at the straight points of the sleeve 1. Expand the tube into a rice ball-shaped triangle with the point where it is located as the apex. Further, rotation of the shaft and cutter 3 is restricted by the round bar key 5. Therefore, even if a large rotational torque is applied to the cutter 3, the cutter 3 does not rotate sharply, and the function is fully satisfied.

<Effects of the Invention> The expansion/contraction shaft allows the gap between the cutter and the shaft to be O, preventing eccentric movement of the cutter, and at the same time, even if a large rotational torque is applied to the cutter, rotation is prevented by the round bar key.
Satisfies the cutting function.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the present invention, and FIG. 2 is a sectional view showing the relationship between the cutter, the round bar key, the shaft, and the semicircular groove. 1- Sleeve 2- Semi-circular groove 3- Cutter 4- Semi-circular groove 5- Round bar key 6- Oil groove 7- Axis Application agent Hisashi Matsumoto

Claims (1)

[Claims] In the expansion/contraction shaft made up of a shaft and a sleeve, the sleeve has three semicircular grooves equally divided, the cutter has three semicircular grooves equally divided, and the semicircular grooves formed in the shaft and An expansion/retraction shaft with a detent key that is constructed by inserting a round bar-shaped key into a circular groove formed by a semicircular groove provided in the cutter.