JPS6242745B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for grinding the surface of the main part of the blade of a sickle shape.

The blade edge of a general-purpose sickle has a special curve with a small radius of curvature at the base and gradually increases the radius of curvature toward the ends of the blade, and the surface of the main part of the blade has a wide width along its entire length. The wall is thin with a gentle slope towards the edge, and a small blade is attached to the edge of the blade. Grinding the surface of the main part of the blade to match the specially curved edge of the blade has traditionally been done manually using a grindstone, which is extremely inefficient and requires skill. ,
Moreover, it is unsuitable for mass production of homogeneous products and naturally increases costs.

This invention was made to solve the above problems, and the reference curve of the surface to be ground on the surface of the main part of the sickle blade is a series of two circular arcs with different radii of curvature. The present invention aims to provide a device that can appropriately mechanically grind the surface of the main part of the blade.

An embodiment of the present invention will be described below based on the drawings. 1 is a base mounted on the machine frame 2 so that it can move up and down,
A hydraulic cylinder 3 is installed at the bottom and moves up and down a predetermined stroke. 4 is a first member whose base is pivotally mounted on the substrate 1 by a support shaft 5, and which swings the base surface in the horizontal direction.
The swinging plate is regulated in its swinging range by an arcuate surface groove 6 provided on the plate surface and a pin 7 that engages with the arcuate surface groove 6 and projects from the base surface. Reference numeral 8 designates a second oscillating board whose base is pivoted near the top center of the first oscillating board 4 via a support shaft 9;
On the upper surface of the swing plate 8 is a recess 10 for fitting the sickle shape body A.
A fixing fastener 11 is also provided, and pins 12 and 13 protruding from the first oscillating plate face contact the side surface of the second oscillating plate in order to regulate the range of oscillation. Reference numeral 14 denotes a connecting arm whose base end is fixed to the second swing plate 8, and the tip of this arm 14 is connected to a hydraulic cylinder 15 disposed on the machine frame 2. 16 is the second swing plate 8
In order to grind the surface of the main part of the blade with the original body A fixed on top, the belt is an endlessly rotating abrasive belt with the lowest bending part 16a facing the part to be ground. The bent rotation portion is formed by hanging the belt 16 over an idling roller 17 having a relatively small diameter.
Although not shown, when the base 1 rises due to the operation of the hydraulic cylinder 3 and the ground surface B of the original object A hits the polishing belt 16, a predetermined pressure is sensed and the operation of the hydraulic cylinder 3 is stopped. Let them do it. In addition, when the hydraulic cylinder 15 is operated, the second swing plate 8 first swings and comes into contact with the pin 13, so that both the first and second swing boards 4 and 8 swing integrally. When the oscillating peripheral speed does not change,
The point in time when the swing plate 8 stops swinging is detected and the hydraulic cylinder 15 is controlled to accelerate its operation.

When the original body A is fitted onto the second swing plate 8, the reference line of the surface to be ground B, that is, the insulation C of the surface to be ground B on the surface of the main part of the blade is used as the grinding reference line, and this edge line C The arc radius r ₁ of the base of is made to coincide with the center of the spindle of the second swing plate 8, and the tip of the edge line C is made to match the center of the spindle of the first swing plate 4.

The operation of the present invention having the above configuration will be explained.

When the hydraulic cylinders 3 and 15 are contracted, the base 1 is at its lowest position, and the first and second swing plates 4 and 8 are at their swing starting points. When the original body A is now fitted onto the second swing plate 8 and the hydraulic circuit is started, the hydraulic cylinder 3 is first extended and the base of the surface B to be ground of the original body A is brought into contact with the abrasive belt 1.
6 and senses a predetermined pressure, the hydraulic cylinder 3
operation stops. Next, the second swing plate 8 starts swinging due to the extension operation of the hydraulic cylinder 15, and grinding begins. The second swing plate 8 continues to swing, and this pin 1
3, the first and second swing plates 4 and 8 start swinging as one. This movement is sensed, the operating speed of the hydraulic cylinder 15 is increased, and the swinging is continued at the same circumferential speed as when only the second swinging plate 8 is swinging, and the grinding by the abrasive belt 16 is continued to the end.

As described above, in this invention, in order to grind the surface of the main part of the blade of a sickle shape, the shape is attached to a rocking plate that swings horizontally around a support shaft, and the shape is ground by applying it to a rotary abrasive body. , uniform grinding is possible, and the grinding reference line for the base and tip of the surface to be ground is a continuous curve of two different arcs, and the first and second oscillations are made in accordance with this. Since the grinder is configured to use a combination of disks and perform grinding without changing the oscillation speed during grinding, the grinding conditions do not change and the surface to be ground is finished neatly, resulting in great practical effects.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view, FIG. 2 is a side view, FIG. 3 is a sectional view of the main part, and FIG. 4 is a front view of the product. 1... Base, 2... Machine frame, 3... Hydraulic cylinder, 4... First swing plate, 5... Support shaft, 6... Long groove, 7... Pin, 8... Second swing Panel, 9... Support shaft, 10... Recess, 11... Fixing fastener, 12
... Stopper arm, 13 ... Pin, 14 ... Connecting arm, 15 ... Hydraulic cylinder, 16 ... Abrasive belt, 17 ... Idle roller, A ... Original form of sickle.

Claims (1)

[Claims] 1. A base that moves up and down, a first swinging plate that is pivoted on the base and swings horizontally, and a second swinging board that is pivoted on the first swinging board and swings horizontally to hold the sickle shape. a rotating abrasive body disposed above the surface to be ground of the main part of the blade of the sickle shape body held by the second oscillating plate;
A sickle shape grinding device characterized in that the swinging plate is configured such that both boards integrally oscillate from the middle of the swinging of the second swinging plate.