JPH063553U - Automatic cutting device for polishing machine - Google Patents

Abstract

(57) [Summary] [Purpose] To grind the blade surface of a tool into a flat surface. [Structure] The sliding base 5 supporting the grindstone 7 is attached to the feed screw 1
2, and the feed screw is connected to the automatic drive unit 15 so that the tool post 3 is automatically rotated in response to the reciprocal switching.
A grindstone is sequentially cut into the tool 6 attached to the tool rest. The detection unit of the automatic drive unit detects the position of the end of the tool rest, and the pulse generation circuit generates a pulse when the intermediate portion of the tool faces the grindstone after a certain time has elapsed from the signal generation of the detection unit. The operating member 19 is operated by the pulse from the pulse generating circuit, and rotates the feed screw by a predetermined amount. The counting unit counts the number of output signals output from the detection unit. Since the grindstone performs a cutting operation when facing the middle portion of the blade, the blade surface is polished flat over its entire length without excessively polishing only the end portion of the blade surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic cutting device for a polishing machine for polishing a blade such as a planer blade for cutting a predetermined amount of a grindstone into the blade surface of the blade.

[0002]

[Prior art]

 As a polishing machine for polishing a cutting tool such as a super-finishing planer blade, an automatic planer blade, an electric planer blade, there is a type as disclosed in JP-A-4-8462. This is because the sliding base supporting the grindstone was screwed onto the feed screw, and this feed screw was connected to the automatic drive unit to automatically rotate in response to the reciprocating switching of the tool post, and was attached to the tool post. The grindstone is sequentially cut into the blade. More specifically, as shown in FIG. 6, when the blade 6 is fed in parallel to the axial direction of the grindstone 7 and the blade surface 6a of the tool 6 approaches the grindstone 7, the grindstone 7 is cut by an arrow so as to cut the tool 6. For example, 3/100 mm is fed in the A direction. From this state, the blade 6 is reciprocated in the direction of arrow B for polishing.

[0003]

[Problems to be solved by the device]

 However, according to the conventional polishing machine, as shown in FIG. 5, when the blade 6 comes to the polishing start position and the detecting portion detects it, the solenoid for sending the grindstone 7 is immediately actuated and the grindstone is actuated. To the blade surface 6a of the blade 6. Therefore, at the moment when the end portion 6b of the blade surface 6a comes into contact with the grindstone 7, the grindstone 7 rotating at a high speed in the unloaded state causes the blade 6 to receive an impact and retract in the direction of arrow A. Therefore, the end portion 6b of the blade surface 6a cannot be finished horizontally.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention is designed so that a sliding base supporting a grindstone is screwed onto a feed screw, and this feed screw is connected to an automatic drive unit to automatically rotate in response to reciprocal switching of a tool post. In an automatic cutting device for a polishing machine that sequentially cuts the grindstone onto a tool attached to the tool post, the automatic drive unit includes a detection unit that detects a position of an end of the tool post, A pulse generation circuit that generates a pulse when the intermediate portion of the blade faces the grindstone after a certain time has elapsed from the signal generation of the detection unit, and the pulse from the pulse generation circuit operates to move the feed screw by a predetermined amount. It is composed of an operating member that rotates and a counting unit that counts the number of output signals output from the detection unit.

[0005]

[Action]

 When the detecting section detects the end of the tool rest, the pulse generating circuit generates a pulse when the middle section of the cutting tool faces the grindstone after a certain time has elapsed from the signal generation of the detecting section.

When the pulse generating circuit generates a pulse, the operating member operates to rotate the feed screw to cut the grindstone into the blade. After that, the blade surface is polished by a grindstone while the tool rest reciprocates.

As described above, since the grindstone moves to the tool side at the middle part of the tool, the blade surface is ground flatly over its entire length without distortion at its end.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, a polishing machine M according to the present invention has a base 1 extending in a longitudinal direction, rails 2 and 2 on the base 1, and a rail 1 on the rail 2 on the base 1. A table 4 is provided which slides in the longitudinal direction. A sliding base 5 is provided on one side of the base 1, and a circular grindstone 7 is supported on the sliding base 5. The round whetstone 7 is rotated by a whetstone motor 8. The sliding base 5 is slidably provided in a direction orthogonal to the longitudinal direction of the base 1, that is, in the lateral direction, and a tool rest 3 is provided at an appropriate position on the table 4, and the front surface of the tool rest 3 is provided. A blade 6 is obliquely fixed to the. A blade surface 6a is formed on the upper portion of the blade 6, and the polishing surface 7a of the grindstone 7 polishes the blade surface 6a. The tool rest 3 is pivotally attached to a support frame 4a provided on the table 4 by a shaft 3a, and by rotating the tool rest 3 about the shaft 3a, the position of the blade surface 6a of the tool 6 can be accurately measured. To control it.

A table 4 supporting the tool rest 3 is provided so as to be reciprocally movable in the longitudinal direction of the base 1, and the reciprocating motion is performed by a rotational force of a table drive motor 10 via a gear mechanism 11 and a table (not shown). It is performed by being transmitted by a pinion rack mechanism provided on the lower surface of No. 4. The pinion rack mechanism (not shown) is also driven by the table manual handle 9.

On the other hand, the grindstone 7 provided on the sliding base 5 is provided so as to be slidable in a direction (lateral direction) orthogonal to the longitudinal axis of the base 1, and the sliding base 5 moves. Is performed by rotation of the feed screw 12. A manual handle 14 is provided at the left end of the feed screw 12 in FIG. 2, and the feed screw 12 is automatically rotated at the right end of the feed screw 12. Drive unit 15 is formed. As shown in FIG. 3, the drive unit 15 has a circular ratchet 16 attached to one end of the feed screw, a reciprocating member 17 for rotating the ratchet 16 by a predetermined angle, and the like. A pawl 18 that engages with the teeth of the ratchet is provided at an intermediate portion of the reciprocating member 17, and the ratchet 16 is rotated by a predetermined angle by the reciprocating movement of the pawl 18. The reciprocating member 17 reciprocates in the DE direction by the solenoid 19, and the iron piece 20 attached to the right end portion of the reciprocating member 17 in the figure is attracted by the solenoid 19 so that the reciprocating member 17 moves in the E direction. Move to. The left end of the reciprocating member 17 in the figure is slidably supported by a support member 22 fixed to the frame of the driving unit 15, and is attached to the left end of the supporting member 22 and the reciprocating member 17 in the figure. The coil spring 23 is interposed between the retaining rings 24. The coil spring 23 urges the reciprocating member 17 in the left direction in the figure, that is, in the D direction. Further, the ratchet pawl 18 is pivotally attached to the pin 50, and the pawl 18 is biased counterclockwise in the figure by the coil spring 51 about the pin 50 so that the lower surface of the pawl 18 contacts the stopper 52. Due to this, the counterclockwise rotation is restricted.

According to such a configuration of the drive unit 15, when the solenoid 19 is excited, the forward / backward movement member 17 moves in the direction E in the figure, and thereby the pawl 18 slightly moves the ratchet 16 in the figure. Turn it counterclockwise. Then, when the solenoid 19 is not excited, the reciprocating member 17 returns in the direction D in the figure by the action of the coil spring 23. At this time, the pawl 18 slightly rotates clockwise in the drawing while pressing the spring 51, passes through the teeth of the ratchet 16 and engages with the next tooth. In this way, the solenoid 19 is energized and de-energized to rotate the ratchet 16 sequentially at a slight angle, which causes the feed screw 12 to rotate and the grindstone 7 to be fixed to the tool rest 3. 6a is sequentially cut into pieces.

In FIG. 1, an operation panel 25 is provided on the left side of the base 1 in the figure, and the operation panel 25 has, for example, a start button 40 for automatically feeding the grindstone 7 in the lateral direction. A stop button 39 or the like for stopping the automatic feeding operation is provided.

FIG. 4 shows the structure of an automatic feed unit 30 for automatically feeding the grindstone 7. This automatic feed control unit 30 has an automatic feed selection circuit 38 composed of a flip-flop circuit, The automatic feed selection circuit 38 is connected to a start button 40 and also connected to a stop button 39 via an OR circuit 37.

The signal from the automatic feed selection circuit 38 is input to the one-shot pulse generation circuit 36 composed of a monostable multivibrator, and the one-shot pulse generation circuit 36 turns ON / OFF the solenoid 19 as an operating member. Controlled. The one-shot pulse generation circuit 36 outputs a pulse signal having a pulse width determined by an external CR time constant circuit from its output terminal.

A pulse is applied to the one-shot pulse generating circuit 36 by a differentiating circuit 33, and a signal obtained by delaying the signal of the detecting section 32 by a timer 41 is input to the differentiating circuit 33. The detection unit 32 includes a limit switch provided at one position where the table 4, that is, the tool rest 3 reverses the lateral movement.

As a result, as shown in FIG. 5B, the signal from the detector 32 is delayed by the timer 41 for t seconds (for example, about 1 second), and the pulse output to the solenoid 19 is also delayed for t seconds. . Therefore, after the grindstone 7 comes into contact with the end of the blade surface 6a and the signal of the detection unit 32 is generated, the solenoid 19 operates t seconds later to cause the grindstone 7 to start cutting the blade 6.

That is, when the blade surface 6a of the blade 6 comes to a position where it abuts the grindstone 7 (see FIG. 6), the blade 6 is moved in the arrow B direction without advancing the grindstone 7 in the arrow A direction. Let At this time, since the grindstone 7 moves while lightly hitting the blade surface 6a of the tool 6, the grindstone 7 is in a loaded state and the rotational speed is slightly reduced. When the grindstone 7 reaches the middle portion of the tool 6 (for example, the central portion of the tool 6), cutting of the tool 6 by the grindstone 7 is started, and the grindstone 7 is fed in the direction of arrow A by about 3/100 mm. From this state, the blade 6 reciprocates in the direction of the arrow B, and the blade surface 6a is evenly cut over its entire length.

The middle portion of the blade 6 is a portion excluding the end portion 6b of the blade surface that does not impair the flatness of the blade surface 6a due to collision with the grindstone 7. The signal from the detection unit 32 is also given to a left and right reciprocating control unit 31 that reciprocates the table 4 left and right, and the left and right reciprocating control unit 31 controls the table motor 10.

The output signal from the detection unit 32 is also given to the counting unit 34, and a count setting circuit 35 is connected to the count unit 34. The output signal from the count setting circuit 35 is the OR signal. It is given to the automatic feed selection circuit 38 via the circuit 37. The output signal from the automatic feed selection circuit 38 is also given to the counting unit 34, which enables or disables counting.

Next, the operation of the automatic cutting device for the polishing machine of the present invention will be described. First, the tool 6 to be ground is fixed to the tool rest 3, and the table 4 is moved to the polishing start position, that is, its reference position. When the table 4 is at the reference position, that is, when the tool rest 3 is at the polishing start position, the manual handle 14 of the feed screw 12 is rotated to bring the sliding base 5 closer to the tool rest 3 and the grindstone 7 The polishing surface 7a is brought into contact with the blade surface 6a of the blade 6.

In this way, the first preparation for starting a predetermined amount of cutting is completed. In this state, the one-shot multivibrator is reset by the automatic feed selection circuit 38 and the counting unit 34 is in a state in which counting is not possible.

When the start button 40 is pressed in this state, the table 4 moves, and when it reaches one end, the limit switch of the detection unit 32 changes from the ON state to the OFF state. This signal is input to the timer 41 and a delayed output is generated. The delay time is set to the time from the signal of the limit switch of the detection unit 32 until the table 4 moves and the vicinity of the center of the blade 6 contacts the grindstone 7. When the vicinity of the center of the blade 6 is being ground by contacting the grindstone, the differential output of the timer 41 causes the differentiating circuit 33 to generate a pulse signal, which causes the one-shot multivibrator to send a signal of a predetermined width to the solenoid 19. Output (Fig. 5). That is, when the table 4 hits the limit switch of the detection unit 32 and the output changes from ON to OFF, the change is sent to the left / right reciprocating control unit 31 to reverse the rotation of the table drive motor 10 and change the output voltage of the limit switch. Is delayed and a negative pulse is generated by the differentiating circuit 33, whereby the solenoid 19 is excited for a predetermined time. When one pulse is generated from the one-shot multivibrator, the feed screw 12 rotates by an angle corresponding to one tooth of the ratchet 16, and the grindstone surface 7a of the grindstone 7 advances by a predetermined depth. When the table 4, that is, the tool rest 3 makes one round trip on the base 1 and is polished at a fixed amount, that is, a cutting amount equivalent to one pulse, and then returns to the original reference position again, the limit switch of the limit switch detection unit 32 The output voltage changes from the ON state to the OFF state. The change in the output voltage causes the differentiating circuit 33 to generate a pulse in the same manner, and the pulse excites the solenoid 19 via the one-shot pulse generating circuit 36 including a one-shot multivibrator. The ON / OFF operation of the limit switch of the detection unit 32 is counted by the counting unit 34, and when the count reaches the set number set by the number-of-times setting circuit 35, the output signal thereof outputs the OR circuit 37. It is then given to the automatic feed selection circuit 38. In the embodiment, the number of times setting is set to 10, and when the solenoid 19 is turned on and off 10 times, the automatic feed selection circuit 38 resets the one-shot pulse generation circuit and puts the counting section 34 into a non-countable state. To do.

In the embodiment, the grindstone 7 is cut into the blade surface 6a of the blade 6 in 10 steps, and thus the blade surface 6a of the blade 6 is accurately cut by the polishing surface 7a of the grindstone 7 by a predetermined amount. Only polished. The sliding base 5 is separated from the blade surface of the blade 6 by rotating a manual handle 14 attached to the feed screw 12. When the feed screw 12 is rotated in the reverse direction, the ratchet 16 of the drive unit 15 is rotated in the reverse direction, that is, the ratchet 16 is rotated counterclockwise in the figure. At this time, the ratchet teeth do not interfere with the movement of the pawl 18. Is formed. If it is desired to stop the cutting operation during the polishing of the blade 6, the stop button 39 is pressed and the change in the output voltage causes the automatic feed selection circuit 38 to operate, whereby the one-shot pulse generation circuit and count are performed. The operation of the section 34 is stopped.

[0024]

[Effect of device]

 Since the present invention is configured as described above, it is possible to polish the blade surface of a blade such as a planer blade over the entire length of the blade surface without excessively polishing only the end portion thereof.

[Brief description of drawings]

FIG. 1 is a plan view of a polishing machine according to the present invention.

FIG. 2 is a front view of the polishing machine.

FIG. 3 is a front view of a drive unit of the polishing machine.

FIG. 4 is a block diagram of an automatic feed control unit of the polishing machine.

FIG. 5 is a signal diagram in an automatic feed control unit.

FIG. 6 is an explanatory diagram showing a feed relationship between a grindstone and a blade.

[Explanation of symbols]

 3 ... Turret 5 ... Sliding base 6 ... Blade 7 ... Grinding stone 12 ... Feed screw 15 ... Automatic drive unit 19 ... Actuating member 32 ... Detecting unit 34 ... Counting unit 36 ... Pulse generating circuit

Claims (1)

[Scope of utility model registration request] 1. A sliding base supporting a grindstone is screwed onto a feed screw, and this feed screw is connected to an automatic drive unit so as to automatically rotate in response to reciprocal switching of the turret and mounted on the turret. In the automatic cutting device of the polishing machine that makes it possible to sequentially cut the grindstone into the cut blade, the automatic drive unit, the detection unit that detects the position of the end of the tool post, and the signal generation of this detection unit. A pulse generating circuit that generates a pulse when the intermediate portion of the blade faces the grindstone after a certain period of time, an operating member that operates by the pulse from the pulse generating circuit, and rotates the feed screw by a predetermined amount, and the detection. An automatic cutting device for a polishing machine, comprising: a counting unit that counts the number of output signals output from the polishing unit.