JPS6348382Y2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to a device for automatically setting the reference position of a grinding wheel in a grinding machine for sharpening blades for woodworking machines.

Recently, knife polishing machines that sharpen knives for woodworking machines are trying to save labor by automating the reciprocation of the knife and the feeding of the grinding wheel. Since the setting operation still requires manual labor and time, labor-saving efforts have not yet been achieved.

The present invention was developed in response to this current situation, and operates when the grinding wheel hits the cutter on the feed screw of the grinding wheel.
To provide a device that automatically sets a reference position of a grinding wheel to align the grinding wheel with the blade surface of a cutter by providing a means for returning the grinding wheel by an inertial drop after stopping the grinding wheel.

Next, an example of the implementation of the device related to the present invention will be explained based on the drawings.

In the figure, reference numeral 1 shows the machine body of a woodworking knife polisher. A horizontal bed 2 is provided on the top of the machine, and a reciprocating means 4 such as a pinion rack or the like driven by a motor 3 is used to reciprocate left and right on this bed 2. A reciprocating table 5 is provided, and a cutter holder 8 is provided on the reciprocating table 5, which is rotatably supported by a pair of left and right bearings 6, 6, and whose angle is adjusted by an angle adjusting means 7 such as a worm/worm gear. A cutter 10 is mounted onto this cutter holder 8 with a holding piece 9 with the cutter surface facing upward. Reference numerals 11 and 11 denote a pair of guides established on the rear side of the fuselage 1, which support the elevator plates 12 and 12 separately, and a motor 13 is vertically attached to one of the elevator plates 12, and a disc-shaped motor 13 is attached to the shaft thereof. A grinding wheel 14 is attached, a motor 13 is attached vertically to the other lifting plate 12, and a bowl-shaped grinding wheel 15 is attached to the shaft thereof, so that the polishing portions of both the grinding wheels 14 and 15 touch the blade surface of the cutter 10 described above. It is made so that it corresponds to 16, 16 are the elevating body 1 from the upper part of the guides 11, 11.
A feed screw is hung toward the feed screws 2 and 12, and motors 17 and 17 with brakes, which can easily change speed, are connected to the upper ends of the feed screws so as to rotate the feed screws in forward and reverse directions. 18,18
is a cylindrical body that is attached to the elevator plates 12, 12 and encloses the feed screws 16, 16, and the feed screws 16 are screwed into each of the cylinders as shown in FIGS. 3 and 4 of the drawings. One non-rotating nut 19 is accommodated in which a vertical groove 20 provided on the circumferential surface is engaged with a detent 21 protruding inside the cylinder 18, and the upper surface of this nut 19 is provided on the upper part of the cylinder 18. A single nut structure may be used, in which a spring 24 is inserted between the lower surface and the lower receiving surface 23 provided at the bottom of the cylinder body 18, or the structure shown in FIGS. 5 and 6 in the drawings. As shown in cylindrical body 1
8, two non-rotating nuts 19 are screwed onto the feed screw 16 with a slight distance between them, and a detent 21 protruding inward from the cylinder body 18 is engaged in a vertical groove 20 provided on the circumferential surface thereof. , 19', and the upper surface of the upper nut 19 is provided on the upper part of the cylinder body 18.
the bottom surface of the lower nut 19' and the cylinder body 1.
The spring 24 is inserted between the spring 24 and the lower receiving surface 23 provided at the lower part of the screw nut 8.The multiple nut structure is advantageous in that it can eliminate backlash in both the up and down directions in the feed screw 16. Reference numeral 25 designates an adjusting screw ring for adjusting the elasticity of the pressure spring 24 described above, and when provided at the lower part of the cylinder body 18 as shown in FIG. 5, it also serves as the lower receiving surface 23, and as shown in FIGS. 6th
As shown in the figure, when it is screwed into the upper part of the cylindrical body 18, it also serves as an upper receiving surface 22. 26 is the cylindrical body 18,
In the notch or hole 27 provided in the upper part of 18,
The upper surface of the single nut 19 or the multiple nut 19,1
9' is a switch operator attached to the upper surface of the upper part 19, and a feed screw stop switch 2 is installed below it.
Elevating plate 1 with feed screws 16 and 16 arranged oppositely.
If no resistance is applied to the lifting plates 12, 12 when feeding the grinding wheels 14, 12, the on contact of the stop switch 28 is held in the on state, and the grinding wheels 14,
15 hits and stops the elevator plates 12, 12, the spring 24 is compressed and lowered, turning off the on contact of the stop switch 28 and stopping the rotation of the motors 17, 17 that drive the feed screws 16, 16. Reference numeral 29 denotes return means for the lifting plates 12, 12, which is turned on when the on contact of the stop switch 28 is turned off as shown in FIG. By pulling up 12, it turns off and stops the motors 17, 17, or
A timer or a counter 30 as shown in Figure 8 of the drawings is combined with the above-mentioned off contact, and the time for reversing the motors 17, 17 is regulated by such timing and counting, thereby achieving accuracy in the amount of return. be.

An example of the implementation of the device according to the present invention is constructed as described above, and as shown in FIGS. 3 and 4 of the drawings, a single non-rotating nut 19 is screwed onto the feed screw 16. In the nut type, by positioning the cutter 10 under the grinding wheel 15 and rotating the feed screw 16 as shown in FIG. In order to lower the elevating plate 12, the grinding wheel 15 supported by the elevating plate 12 is sent out to the cutter 10, and
When it hits the blade surface of 0, it stops and a stop switch 28 attached to the cylinder body 18 is stopped. However, since the switch operator 26 attached to the non-rotating nut 19 is fed by the feed screw 16, the stop switch 28 is actuated to turn off its on contact and the motor 17 is turned off.
At the same time, the return means 29 using an off contact is turned on, power is supplied to the motor 17 to reversely rotate the feed screw 16, and the nut 19 raises the elevator plate 12 by the amount of inertia descent. At this time, since the return means 29 is turned off, the motor 17 is stopped and the feeding of the grinding wheel 15 is stopped. Therefore, the grinding wheel 15 stops at a position where it is just touching the blade surface of the cutter 10, and the cutter 10 is moved to the grinding wheel 1 in order to set the next depth of cut.
Even if the blade 10 is moved laterally to escape from under the grinding wheel 15, the blade 10 will not hit the grinding wheel 15, and the blade 10 will be dragged on the grinding wheel surface, resulting in chipping or crushing of the blade 10, and damage to the grinding wheel 15.
The reference position of the cut is automatically and accurately set without causing any dents or chips. After setting the reference position in this way, the reciprocating means 4 causes the blade holder 8 to reciprocate, and the feed screw 16 lowers the elevating plate 12 to send the grinding wheel to the reciprocating blade 10. If the wheel 14 is made to cut into the cutter 10 by an appropriate amount of cut at the intermediate portion, the cutter 10 can be cut without bending the cutting edge of the cutter 10 and causing the edge of the cutter 10 to fall off, which is likely to occur due to insufficient rigidity of the machine. Polishing is performed accurately.

Further, when the above-described return means 29 is used in combination with a timer and a counter 30, the timer and counter 30 are activated by the operation of the return means 29, and the timer and counter 30 are clocked and counted to reverse the rotation of the motor 17 at a preset value. , and the return of the grinding wheel is stopped. In this case, the lifting amount of the grinding wheel 15 can be precisely regulated, so the operation accuracy is higher than when only the off contact of the stop switch 28 is operated. , the setting position can be changed and corrected by adjusting the pulling amount.

Next, when the two non-rotating nuts 19, 19' are screwed onto the feed screw 16 as shown in FIGS. 5 and 6, when the feed screw 16 is rotated, the
The non-rotating nuts 19, 19' are uniformly screwed downward, lowering the cylinder 18 and the lifting plate 12,
The grinding wheel 15 supported by the lifting plate 12 is brought close to the cutter 10, and as soon as it touches the blade surface, the grinding wheel 15
When the stop switch 28 attached to the cylinder body 18 stops, the non-rotating nuts 19, 19' stop the feed screw 1.
6 to move the switch operator 26, the stop switch 28 operates as described above to stop the motor 17, and at the same time, the return means 29 operates.
The motor 17 is rotated in the opposite direction, the elevator plate 12 is pulled up by the inertial descent, and the grinding wheel 15 is stopped at a position where it is just touching the blade surface of the cutter 10.The reference position for the cut of the grinding wheel 15 is automatically set. It is the same as the single nut type. However, in this multiple nut type, the two upper and lower non-rotating nuts 19, 19' are separated and screwed together to the feed screw 16, and the weight of the lifting plate 12, grinding wheel 15, and drive unit 13 is applied to the upper one. By applying the elastic force of the spring 24 to the lower part, the non-rotating nuts 19 and 19' are pressurized in opposite directions, so that the feed screw 16 is no longer buckled in both the up and down directions, and the grinding wheel 15 is prevented from falling. This makes it possible to perform extremely high-precision feeding without any problems.

As described above, in the device according to the present invention, a grinding wheel supported by an elevating plate that engages with a guide is screwed into a non-rotating nut of the elevating plate, and the grinding wheel cuts into a blade. A feed screw, a blade holder that supports the blade so that the portion to be ground is in contact with the grinding wheel, and a reciprocating means that is linked to the blade holder and sequentially changes the grinding position of the blade by the grinding wheel. In a woodworking knife sharpening machine, when the screw feed of the lifting plate is stopped by being sandwiched between the lower surface of the non-rotating nut of the feed screw and the lower receiving surface of the lifting plate, the nut tightens and becomes non-rotating. a spring that enables the movement of the nut; a switch operator attached to the non-rotating nut so as to look out of the lifting plate; and a switch operator that allows the nut to be raised and lowered so as to be operated by the switch operator when the spring is compressed. This is because it is equipped with a stop switch for the feed screw attached to the board, and a return means that reversely operates the feed screw in response to the operation of the stop switch to return the elevating board by the amount of inertia descent. When the grinding wheel is placed on the cutting tool and the elevating plate is sent by the feed screw, the grinding wheel hits the blade surface of the cutting tool, and the elevating plate stops descending accordingly, but the non-rotating nut compresses the spring and descends. Operate the stop switch using the switch operator, stop the rotation of the feed screw, and activate the return means, rotate the feed screw in the opposite direction, raise the elevator by the amount of inertia during feeding, and move the grinding wheel so that it is just touching the blade surface of the cutter. Even if you move the tool laterally to remove it from under the grinding wheel in order to set the next depth of cut, the tool will not be dragged on the grinding wheel surface, resulting in chipping or crushing of the tool blade, or damage to the grinding wheel. Setting the reference position of the cut of the grinding wheel that will not cause dents or chips is done automatically without the need for human intervention, and in combination with the automation of the reciprocation of the blade and the feeding of the grinding wheel, it becomes possible to unattended the grinding of the blade, resulting in labor savings. It has sufficient effect.

In addition, this device allows the cutting tool to escape from under the grinding wheel by setting the reference position of the cut, and after reciprocating and placing the tool using the reciprocating means, allows the grinding wheel to cut into the middle part of the length. To achieve a high straightness precision, it is possible to polish a knife for a woodworking machine, which tends to have selvage on the edge because the cutting edge is thin and easily bent and the rigidity of the machine body is insufficient.

In particular, this device is troublesome because a switch operator that can be seen from the outside of the elevator plate is attached to a non-rotating nut screwed onto the feed screw of the elevator plate, and the stop switch of the feed screw is operated by this operator. The device can be constructed easily and inexpensively without the need for extensive machining or auxiliary equipment, and since the aforementioned non-rotating nut has a spring engaged at its bottom, the pressure of this spring causes the feed screw to rotate. This eliminates the back crush, which improves the screw feeding accuracy of the grinding wheel, and ensures the positioning of the nut.Also, after the grinding wheel and elevator stop, the nut is moved by compressing the spring, so the grinding wheel Even if the wheel is applied to the blade to set the position, the blade does not chip or collapse, which is a unique effect.

[Brief explanation of drawings]

The drawings show an example of the implementation of the device according to the present invention, and FIG. 1 is a front view of a knife polisher equipped with this device. FIG. 2 is an enlarged side view showing the main parts of the same as above. FIG. 3 is an enlarged longitudinal sectional front view showing a single-nut type device.
FIG. 4 is an enlarged longitudinal sectional front view showing another example same as the above. FIG. 5 is an enlarged longitudinal sectional front view showing a multiple-nut type device.
FIG. 6 is an enlarged longitudinal sectional front view showing another example same as the above. FIG. 7 is a conceptual diagram showing a feed screw stop switch and return means. FIG. 8 is a conceptual diagram showing another example same as the above. In the figure, 14 and 15 are grinding wheels, 12 and 12 are elevator plates, 11 and 11 are guides, 16 and 16 are feed screws, 19 or 19, 19' are non-rotating nuts, and 22
23 is an upper receiving surface, 23 is a lower receiving surface, 24 is a spring, 26 is a switch operator, 28 is a stop switch, and 29 is a return means.

Claims (1)

[Scope of utility model registration request] A grinding wheel supported by an elevating plate that engages with a guide, a feed screw screwed into a non-rotating nut supported by the elevating plate to cause the grinding wheel to cut into the blade, and a feed screw that causes the grinding wheel to cut into the blade. In the woodworking knife polishing machine, the woodworking knife polisher is equipped with a knife holder that supports the part to be ground so as to come into contact with the grinding wheel, and a reciprocating means that sequentially moves the knife holder so that the part to be ground is ground by the grinding wheel. a spring which is interposed between the lower surface of the non-rotating nut screwed into the feed screw and the lower receiving surface of the lifting plate, and is compressed when the screw feeding of the lifting plate is stopped, thereby enabling movement of the non-rotating nut; , a switch operator attached to the non-rotating nut so as to look out of the elevator plate; and a stop of the feed screw attached to the elevator plate so as to be operated by the switch operator when the spring is tightened. A reference position for automatic cutting in a knife sharpening machine, characterized in that it is equipped with a switch, and a return means that reversely operates the feed screw in response to the operation of the stop switch, and returns the elevator plate by an inertial descent amount. Setting device.