JPH0329080Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a grinding wheel feed crush prevention device for a knife grinder used in the construction and woodworking industries.

The inventor of the present invention previously devised a device for setting the reference position of the cut in a blade polishing machine according to Utility Model Application No. 57-34356. This tool includes a blade holder that holds a blade and is reciprocated by a reciprocating means, a grinding wheel that is supported by a lifting plate that engages a guide and is disposed on the blade, and a grinding wheel that is supported by the lifting plate. In a knife polishing machine equipped with a feed screw that is screwed onto a non-rotating nut to give feed to the grinding wheel to cut into the cutter, two upper and lower screws are screwed together so as not to contact each other with the feed screw. a non-rotating nut, an upper receiving surface of the elevating plate that abuts the upper non-rotating nut, and a spring interposed between the lower receiving surface of the elevating plate and the lower non-rotating nut; A switch operator is attached to the upper non-rotating nut so as to protrude outside the elevator plate, and a stop switch is attached to the elevator plate so as to be operated by the switch operator to stop the screw feeding means. Then, apply the weight of the lift plate system to the upper non-rotating nut, apply spring pressure to the lower non-rotating nut, and bring both nuts into close contact with the feed screw from opposite directions. At the same time, when the screw-fed grinding wheel hits the cutting tool, the lifting plate stops, but the non-rotating nut moves due to the tension of the spring, and the stop switch is actuated by the switch operator, and the cutting tool is stopped. Since the feed is automatically stopped, not only is the grinding wheel fed with extremely high accuracy by completely removing the bumps, but also when the grinding part of the grinding wheel hits the blade surface of the cutter, the grinding wheel stops moving in this state. This has the unique effect of automatically and accurately setting the standard for the grinding wheel, which stops the feed of the grinding wheel and aligns the grinding wheel with the cutting edge of the cutter.

However, in this device, since the switch operator is attached to the non-rotating nut on the upper side of the lift plate which is heavy, backlash of the non-rotating nut occurs in the feeding direction of the feed screw.

For this reason, even if the grinding wheel that feeds the screw stops when it hits the cutter, and the switch immediately stops along with the lifting plate, the switch operator will be unable to feed the screw because the upper non-rotating nut is back-crashed. The switch-off is delayed because the operator is not activated immediately, and during this time, the lower non-rotating nut, which does not have backlash in the feed direction, is fed by the feed screw and presses the grinding wheel against the cutting tool in order to lower the elevator plate. That's true. Therefore, when the grinding wheel touches the cutter, the screw feed is stopped at that moment, and the reference position of the grinding wheel, which aligns the grinding wheel with the blade surface of the cutter, is not set as desired, and if the grinding is large. Not only does this cause the grinding wheel to be strongly pressed against the cutting tool, causing chipping of the cutting tool's edge or local damage to the grinding wheel, but also the backlash between the feed screw and the non-rotating nut is variable for each machine. Therefore, it is impossible to set the standard position of the grinding wheel uniformly for all machines, and the backlash increases as the screws and nuts wear out, so it is necessary to correct the standard position setting accordingly. There was a problem.

The present invention was made to eliminate the above-mentioned drawbacks, and the switch operator for operating the stop switch of the feed screw is attached to the lower non-rotating nut that does not have a backlash in the screw feeding direction, above the switch. At the same time, when the grinding wheel hits the cutter and stops, the switch is operated to stop the feed screw, and the reference position is set with high precision to align the grinding wheel with the blade surface of the cutter. The aim is to provide a device that does not cause damage to the car.

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

In Figure 1 of the drawings, reference numeral 1 denotes the machine body of a woodworking knife grinder.A horizontal bed 2 is provided on the top of the machine, and a reciprocating means 4 such as a pinion rack driven by a motor 3 is used to move left and right on this bed 2. A reciprocating carriage 5 is provided, and an angle adjusting means 7 such as a worm or worm gear is rotatably supported on the carriage 5 by a pair of left and right bearings 6, 6.
A blade holder 8 whose angle can be adjusted is provided, and a blade 10 is mounted onto this blade holder 8 with a holding piece 9 with the blade surface facing upward. 11,11
is a pair of guides established on the rear side of the machine body 1, which support the lifting plates 12, 12 separately, and a motor 13 is horizontally attached to one of the lifting plates 12, and a disc-shaped grinding wheel 14 is attached to the shaft of the motor 13. Attach the other lifting body 12
A motor 13 is mounted vertically on the shaft, and a bowl-shaped grinding wheel 15 is mounted on the shaft of the motor 13.
The abrasive portion of the blade contacts the blade surface of the cutter 10 described above. Reference numerals 16 and 16 are feed screws suspended from the upper portions of the guides 11 and 11 toward the elevator plates 12 and 12, and the upper ends thereof are connected to motors 17 and 17 with variable speed brakes so that the screws can be rotated in forward and reverse directions. It is set as. Reference numerals 18 and 18 indicate nut accommodating portions that are attached to the elevator plates 12 and 12 and contain the feed screws 16 and 16, respectively.
16 so that they do not come into contact with each other, and protrude inward from the nut accommodating portions 18, 18 into vertical grooves 20, 20' provided on the circumferential surface thereof, respectively.
21', a pair of upper and lower non-rotating nuts 19,
19', the upper non-rotating nut is brought into contact with the upper receiving surface 22 provided on the upper part of the accommodating parts 18, 18, and the lower non-rotating nut 19' and the accommodating parts 18, 1
A spring 24 is inserted between the lower receiving surface 23 provided at the lower part of the spring 8. Reference numeral 25 designates an adjusting screw ring for adjusting the elasticity of the spring 24 described above, which also serves as the lower receiving surface 23 when screwed into the lower part of the nut accommodating portion 18 as shown in FIG. 3 of the drawings. 26 is the nut accommodating portion 18
In the notch 27 provided in the middle of the lower non-rotating nut 19', the stop switch 28 of the feed screw 16 is connected to the lower side of the switch operator attached to the lower non-rotating nut 19'. If no resistance is applied to the elevator plates 12, 12 when the elevator plates 12, 12 are fed by the feed screws 16, 16, the stop switch 28 is held in the ON state and the grinding wheels 14, 15 are fed. Grinding wheel 1 to knife 10
4 and 15 hit and stop the elevator plates 12 and 12,
Operate the stop switch 28 to turn it off and stop the rotation of the reducer motors 17, 17 that drive the feed screws 16, 16, or operate an auxiliary circuit (not shown in the drawing) that combines a timer and a counter. , the motors 17, 17 after the stop are slightly reversed to pull up the elevating bodies 12, 12, and the grinding wheels 14, 15
The reference position of the cut is automatically set to match the blade surface of the cutter 10.

In the backlash prevention device for grinding wheel feeding in a cutter grinder configured as described above, the upper non-rotating nut 19 is screwed onto the vertical feed screw 16.
is in contact with the upper receiving surface 22 of the elevator board 12, and the elevator board 1
2. Since the weight of the grinding wheel 14 or 15 and the drive motor 13 is added, as shown in FIG. Since a pushing force is applied by the spring 24, the upper surface is brought into close contact with the lower surface of the feed screw 16, as shown in the figure, and no backlash occurs in both the upper and lower directions. Therefore, when the feed screw 16 is rotated to lower the nuts 19, 19' in the direction of the arrow, the nuts 19, 19' move exactly by the amount of feed of the feed screw 16, resulting in a high precision of 1/100 mm. The grinding wheel is fed smoothly and reliably.
When the grinding wheels 14 and 15 sent out in this manner hit the blade surface of the cutter 10, the elevator plate 12 stops. However, the feed screw 16 continues to operate, lowering the lower non-rotating nut 19' which has no backlash with respect to the feed direction, and operating the stop switch 28 using the switch operator 26 almost simultaneously with the stop of the lifting platform 12.
is activated, the motor 17 is stopped by the switch off, and the feed screw 16 is stopped, so the grinding wheel 1
4 and 15 stop when the grinding surface is aligned with the blade surface of the cutter 10, and the reference position for the next cut is automatically set.

The device related to this invention screws the upper and lower non-rotating nuts onto the feed screw of the lifting plate without touching them, the upper non-rotating nut carries the weight of the lifting plate system, and the lower non-rotating nut Apply spring pressure to
By bringing both nuts into close contact with the feed screw from opposite directions, it is possible to completely eliminate the buckle crash in both directions of the feed screw, and also to move the operator of the switch that stops the feed screw to the lower side that does not have buckle bumps in the screw feed direction. Attach the feed screw to the non-rotating nut above the switch that stops the feed screw, and at the same time as the screw-fed grinding wheel hits the cutter, operate the switch using the switch operator to stop the feed screw, and the grinding wheel will stop the feed screw. The reference position for grinding is set with high precision to match the blade surface of the grinder, and the grinding wheel is prevented from being pressed against the cutter, so there is no chipping of the cutter's edge or local damage to the grinding wheel, and the setting of the reference position is very accurate. Since the backlash of the screws has no effect on this, it is possible to completely equalize the set dimensions of each machine, and it has the unique effect of not causing changes in the set dimensions due to wear of the screws or nuts.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of a woodworking knife polisher equipped with a device related to the present invention. FIG. 2 is an enlarged side view of the grinding wheel feeding part in the same as above. FIG. 3 is an enlarged longitudinal sectional side view showing the structure of the main parts of the device. FIG. 4 is an explanatory diagram showing the backlash removing action of the above device. 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 and 19' are non-rotating nuts, 22 is an upper receiving surface,
23 is a lower receiving surface, 24 is a spring, 26 is a switch operation piece, and 28 is a stop switch for the feed screw 16.

Claims (1)

[Scope of utility model registration request] A cutter holder that holds a cutter and is reciprocated by a reciprocating means, a grinding wheel disposed on the cutter while being supported by an elevating plate that engages with a guide, and a non-rotating nut supported by the elevating plate. In a knife polishing machine equipped with a feed screw that is screwed together to give the grinding wheel the feed to cut into the cutter, two upper and lower non-rotating nuts are screwed together with the feed screw so that they do not come into contact with each other. , an upper receiving surface of the lifting plate that is brought into contact with the non-rotating nut on the upper part, a spring interposed between the lower receiving surface of the lifting plate and the lower non-rotating nut, and a nut housing of the lifting plate. A switch is attached to the outside of the lift plate to stop the feed screw, and a switch is attached to the above-mentioned lower non-rotating nut so as to protrude outward from the window hole of the lift plate so as to correspond above the stop switch, and when the lift plate is lowered, What is claimed is: 1. A grinding wheel feed crush prevention device for a knife sharpening machine, characterized in that it is equipped with an operator for operating a switch.