RO129538A2 - Device for sharpening tools with helical surfaces - Google Patents

Abstract

The invention relates to a device used for sharpening tools with helical surfaces, placed on the table of a sharpener with abrasive discs. According to the invention, the device consists of a main shaft () whereon the tool () to be sharpened is fixed, the main shaft () passes through a ball bearing () inside which there is fixed, by hooping, a profiled ring () which is in contact with the main shaft (), the ball bearing () being fastened in a box () which is integral with a shaft () of a worm gear (), on the shaft () there being mounted a spring disk () and a pressure bearing () fixed in the bore hole of an upper plate (), the worm gear () mounted with a wedge on the shaft () gears with a worm (), at the end of a worm shaft () there being placed a handle () for gearing the worm (), by actuating the handle (), the worm () gears with the worm gear () which by rotation inclines the box () together with the ball bearing () under an inclination angle () which coincides with the inclination angle of the screw of the tool () thus defining the helical walk of the tool (), the tool () being driven by actuating a hand wheel () in one sense or another, alternately, the tool () performing a rotary-translation movement under an abrasive disk () placed at the angle ().

Description

The invention relates to a device used to measure or sharpen tools with helical surfaces.

The problem to be solved by the invention is to provide a mechanism that allows the device to be adapted according to the helical pitch of the tool to be sharpened so that the abrasive disc is in continuous contact with the helical surface of the tool.

The following is an example of an embodiment of the device, in relation to FIGS.

- Figure 1, side view of the device;

- figure 2, section with a plane B-B as shown in figure 1.

The device for controlling and sharpening tools with helical surfaces, according to the invention is made up of a main shaft (3) on which the tool (1) to be sharpened will be fixed. The main shaft passes through a radial bearing (4) within which a profiled ring (5) which contacts the main shaft (2) is fixed by means of a thread. The radial bearing (4) is fixed in a housing (6) closely connected to the screw wheel shaft (7). On the shaft (7) is mounted a disc spring (8) and a combined pressure bearing (9) fixed in the bore of the upper plate (10). The screw wheel (11) mounted on the shaft (7) engages with the screw (12). At the end of the screw shaft (13) is a handle for driving the screw (15).

The tilt of the bearing (4) with an angle γ, to give the shaft (3) a helical movement, is achieved by means of the high precision gear between the screw (12) and the screw wheel (11) by actuating the handle (15). For tools with a left helical pitch, the bearing (4) will bend at an angle - γ. By gear, the screw wheel (11) rotates, tilting the box (6) together with the bearing (4) at an angle γ through the screw wheel (7), tightly connected between the screw wheel (11) and the box (6). The tilt angle γ of the bearing (4) will be equal to the tilt angle of the tool propeller. The tool (1) to be sharpened is driven by the handwheel (3). The tool together with the main shaft (2) will perform a helical movement with the step taken by the inclination with the angle γ of the profiled ring (5) which comes into contact with the shaft, and the cutting edge of the tool will be in continuous contact with the abrasive disc.

By applying the invention, the following advantages are obtained:

- simple and cheap construction;

- the same device can be used to control or sharpen tools with different helical steps with left or right propellers;

- being a continuously adjustable device, helical surfaces with non-standardized parameters can be measured or sharpened;

- comfortable and precise adjustment of the pitch of the propeller;

The disadvantages of the invention are the following:

wear of contact elements may affect the accuracy of sharpening or measurement;

constructive limitations on the pitch of the propeller;

- the inclination of the profiled ring limited to a relatively small angle of ± γ;

Claims (5)

1. The tool for sharpening tools with helical surfaces, formed by a main shaft (2), on which the tool requiring sharpening (1) will be fixed, characterized in that the shaft (2) passes through a bearing (4) on whose inner diameter is fixed by fretwork a profiled ring (5), which contacts the shaft. The control device and sharp tools with helical surfaces, according to claim 1, characterized in that the bearing (4) is fixed in the box (6) tightly connected to the screw wheel (11) by means of the shaft (7) on which a shaft (7) is mounted. disc spring (8) and a combined pressure bearing (9). The tool for controlling and sharpening tools with helical surfaces, according to claim 1, characterized in that the helical movement of the main shaft (2) together with the tool to be sharpened (1) is achieved by tilting the bearing (4) with an angle. γ is equal to the inclination angle of the tool propeller. 4. The control and sharpening tools with helical surfaces, according to claim 3, characterized in that the tilting of the bearing (4) is achieved by actuating the handle (15) of the screw shaft (13) which by a high precision gear will act. the tread wheel (11) inclining the cassette (6) together with the bearing (4). The tool for controlling and sharpening tools with helical surfaces, according to claim 3, characterized in that the helical movement of the tool (1) together with the main shaft (2) is accomplished by actuating the hand wheel (3), the helical movement performing - is due to the inclination at an angle γ of the bearing (4) whose inner ring shaped profile (5) contacts the shaft (2).