JPH0796184B2 - Woodworking grinder - Google Patents

Description

The present invention relates to a grinder for woodworking, which is equipped with a grinding wheel such as a roll brush and is most suitable for grinding and polishing a frame material.

<Problems to be Solved by the Invention> As a grinding machine using a grinding wheel, there is one in which the grinding wheel is arranged in a direction orthogonal to the traveling direction of the processed material.

By the way, in the case of such a configuration, when grinding a frame material having front and rear bars x, y, when the grinding wheel is rotated at an appropriate number of revolutions on the finished surface, the front and rear bars x, y
For each of the front and rear edges of y, the rotation speed becomes excessively high, resulting in oversanding and edge drooping. On the other hand, if the rotation speed is reduced to eliminate this sagging, not only the work efficiency deteriorates, but also the finish of the vertical bars z and z between the front and rear bars x and y deteriorates.

An object of the present invention is to provide a grinder for woodworking capable of preventing edge drooping without reducing the overall finish as much as possible.

<Means for Solving Problems> In the present invention, a grinding wheel is provided above a material feeding device with a rotation axis orthogonal to the material feeding direction. A drive motor with a transmission that drives at least two modes capable of speed conversion, and a transmission so that the transmission is converted to a low speed side when the front and rear edges of the frame workpiece reach the grinding wheel position. And a timing command means for controlling switching.

Here, as the timing command means, a detector provided in front of the grinding wheel to detect arrival and passage of the frame processed material, and a transfer time t ₁ from immediately below the detector to immediately below the grinding wheel The sum of the timer T ₁ (T ₃ ) in which is set and the transfer time t _{1 of} the previous period and the transfer time t ₂ from the front edge f to the rear edge r of the front and rear crosspieces x and y of the frame workpiece w _The drive motor with a transmission is controlled by the time-up signal of timer T ₂ (T ₄ ) where ₃ is set and timer T ₁ (T ₃ ) to rotate the grinding wheel at low speed, and the time of timer T ₂ and T ₄ is set. It is proposed to control the drive motor with a transmission by the up signal to rotate the grinding wheel at a constant speed.

Further, as another timing command means, a detector provided in front of the grinding wheel for detecting arrival and passage of the frame processed material, and a distance from immediately below the detector to immediately below the grinding wheel. Counter with corresponding value set
A counter set with a value corresponding to the sum t ₃ of C ₁ (C ₃ ) and the distance and the width dimension from the front edge f to the rear edge r of the front and rear crosspieces x and y of the frame material w. C ₂ (C ₄ ) and counter C
_The drive motor with a transmission is controlled by the count exhaustion signal of ₁ (C ₃ ) to rotate the grinding wheel at low speed,
A central control unit for controlling the drive motor with a transmission by the count exhaust signal of ₂ (C ₄ ) to rotate the grinding wheel at a constant speed can also be proposed.

<Operation> When the front and rear rails x and y of the frame processed material arrive at the grinding wheel, the grinding wheel is switched to low speed rotation, and the front and rear rails x and y are lightly ground. Therefore, the front and rear crosspieces x and y are ground without any edge sag. Further, the grinding wheel is in a constant rotation on the vertical rails z and z between the front and rear rails x and y of the frame material, and high-speed grinding suitable for the material of the frame material is performed to achieve a good finished surface.

<Example> An example of a wood working grinder of the present invention will be described with reference to Figs.

Reference numeral 1 is a machine frame, and a material feeding device 2 is arranged in the front-rear direction in the lower portion thereof.

Explaining the configuration of the material feeding device 2, the material feeding frame 3
Is provided with a driving material-feeding roll 4 and a driven material-feeding roll 5 driven by a material-feeding motor 6 at the front and rear ends protruding from the machine frame 1. The material feeding belt 7 having the holes formed therein runs around and runs.

In the material feeding frame 3, a grinding head 13 to be described later is provided.
At the position of a, 13b, inscribed in the upper running part of the material feeding belt 7,
A suction port 9 for sucking grinding dust is provided. The material feeding frame 3 is supported by a screw shaft (not shown), and can be adjusted up and down by rotating the handle 10 to rotate the screw shaft. The suction port 9 communicates with a vacuum device (not shown) arranged outside the machine frame 1.

On the upper part of the machine frame 1 is installed a mounting rail 11 in the width direction, and dovetail-shaped guides 12, 12 formed on the front and rear surfaces of the mounting rail 11 are provided with mounting frames 14, 14 of grinding heads 13a, 13b, respectively. It is mounted so that it can be raised and lowered. On the machine frame 1, rotating shafts 15, 15 are arranged before and after the installation rail 11, and a vertical lifting screw 17 screwed to the mounting frame 14 and held on the installation rail 11 is rotated. Axis 15,15
The bevel frame 14 is linked with the screw part of the rotating shaft 15 through a bevel gear, and the handle 16 provided at the end of the rotating shaft 15 is rotated to move the mounting frame 14 along the lifting screw 17 and the dovetail-shaped guide 12. I am going up and down. Grinding wheels 19a, 19b made of brush rolls are supported on the mounting frame 14, and are rotated by a three-phase drive motor 20a, 20b arranged on the mounting frame 14 via a belt interlocking mechanism 22. .

Further, the mouth end of the duct 23 for discharging grinding dust faces the lower portions of the grinding wheels 19a, 19b. Furthermore, a plurality of press rolls 24 are pivotally supported on the upper portion of the material feeding device 2.

The drive motors 20a and 20b are connected to transmissions 21a and 21b, which are inverters, respectively. The transmissions 21a and 21b convert the frequency of the AC voltage that drives the drive motors 20a and 20b,
The voltage is applied to the drive motors 20a and 20b,
A high-frequency steady rotation output and a low-frequency low-speed rotation output are generated and applied to the drive motors 20a and 20b. This rotation output conversion is performed by the timing command means 30a, 3 shown in FIGS.
Controlled by 0b. This timing command means 30a, 30b
(See FIGS. 3 and 4) are applied to the frame material w of furniture, respectively.

Details of the timing command means 30a will be described with reference to FIG.

Of the press rolls 24, those located immediately before the grinding wheels 19a, 19b are the detection rollers 24a, 24b.
Abutting portions 31, 31 are formed on the 4b, and limit switches LS ₁ , LS ₂ that are turned on by the raising of the detection rollers 24a, 24b are arranged immediately below the abutting portions 31, 31. Thus, this detection roller 24a, 2
The detector of the present invention is constituted by 4b and the limit switches LS ₁ and LS ₂ .

The limit switches LS ₁ and LS ₂ are connected to the central control unit CPU, and a detection signal accompanying the ON operation is input to the central control unit CPU. On the output side of the central control unit CPU, timers T ₁ and T ₂ corresponding to the grinding wheel 19a and a grinding wheel 19b are provided.
Timers T ₃ and T ₄ corresponding to are connected. This timer T
₁ and T ₂ are activated as the detection signal of the limit switch LS ₁ is generated. Further, the timer T ₁ is set with the transfer time t ₁ from immediately below the detection roller 24a to immediately below the grinding wheel 19a, and the timer T ₂ has the transfer time t ₁ and the frame workpiece w. A sum t ₃ of the transfer time t ₂ from the front edge f to the rear edge r of the front and rear crosspieces x and y is set. Then, the transmission 21a is converted to the low speed side by the time-up signal of the timer T ₁ , a low frequency AC voltage is applied to the drive motor 20a, the grinding wheel 19a is rotated at low speed, and the time of the timer T ₂ is set. With the generation of the up signal, the transmission 21
a returns to the steady speed side, and a high frequency alternating voltage is applied to the drive motor 20a to rotate the grinding wheel 19a at the steady speed.

Similarly, the timers T ₃ and T ₄ are activated when the limit switch LS ₂ is turned on, and the timer T ₃ is set to transfer time t ₁ ′ from immediately below the detection roller 24b to immediately below the grinding wheel 19b.
The timer T ₄ is set to the sum t ₃ ′ of the transfer time t ₁ ′ and the transfer time t ₂ . Then, the transmission 21b is converted to the low speed side by the tie-up signal of the timer T ₃ , the grinding wheel 19b is rotated at a low speed, and the transmission 21b is returned to the steady speed side with the generation of the time-up signal of the timer T _4. Then, the grinding wheel 19b is rotated at a constant speed.

Next, the operation of the above embodiment will be described.

The drive material-feeding roll 4 is driven and the material-feeding belt 7 is run, and then a frame-shaped frame workpiece material w is supplied onto the material-feeding belt 7 (see FIG. 5). When the front crosspiece x of the frame was workpiece w is right below the detection roller 24a,該探knowledge roller 24a is raised, the limit be located LS ₁ is turned on actuation. And central controller C
This detection signal drives the timers T ₁ and T ₂ via the PU. As a result, the front edge f of the front rail x becomes the grinding wheel 19
When it arrives at a, the timer T ₁ is set in advance corresponding to the time until it arrives.
By the time-up signal of T ₁ , the transmission 21a is switched to the low speed side, and a low frequency AC voltage is applied to the drive motor 20a. Therefore, the grinding wheel 19a driven by the drive motor 20a is switched to the low rotation side, and the moderate grinding is performed from the front edge f to the rear edge r of the front bar x of the frame workpiece w. To be done. Further, when the trailing edge r of the front rail x arrives just below the grinding wheel 19a, the timer T ₂ outputs a time-up signal corresponding to the arrival time, the transmission 21a switches to the steady speed side, and the drive motor The high-frequency voltage is applied to 20a, and the grinding wheel 19b rotates at high speed in steady state.
Then, the longitudinal bars z, z in the front-rear direction of the frame material w are optimally ground.

Next, when the rear rail y of the frame material w comes to the detection roller 24a, the timers T ₁ and T ₂ are driven in the same manner, and the rear rail y is controlled by the switching control of the transmission 21a associated with the respective time-up signals. When the leading edge f reaches the grinding wheel 19a, the steady speed (high speed) is switched to the low speed, and the steady speed is switched again when the trailing edge r passes.

Further, when the front rail x passes the grinding wheel 19a and comes directly under the detection roller 24b, the limit switch LS ₂ is similarly turned on and the timers T ₃ and T ₄ are driven, and the front edge of the front rail x is moved. When f arrives at the grinding wheel 19b, the transmission 21b is switched to the low speed side and the grinding wheel 19b is switched to the low rotation side by the time-up signal of the timer T ₃ , so that the grinding wheel 19b is switched.
When the trailing edge r arrives just below, the timer T ₄ outputs a time-up signal, the transmission 21b is switched, and the grinding wheel 1
9b rotates at a high speed and the vertical bars z, z in the front-rear direction of the frame workpiece w are subjected to optimum grinding. Further, the grinding of the rear crosspiece y of the frame work material w is similarly performed.

Thus, the frame processed material w is ground twice by the grinding wheels 19a and 19b, and the front edge f and the rear edge r are given a moderate grinding by the low speed rotation, Its edges are prevented.

FIG. 4 shows another timing command means 30b, which is a limit switch L associated with the rise of the detection rollers 24a, 24b.
The conversion timing of the grinding wheels 19a and 19b by S ₁ and LS _{2 is} based on the rotation amount of the driving material feeding roll 4 that drives the material feeding belt 7.

That is, the slit plate 35 is fixed to the rotary shaft of the drive material feeding roll 4 or the drive system axis of the material feeding roll 4 such as the drive shaft of the material feeding motor 6 and is formed in the circumferential direction of the slit plate 35. The passage through the slit is read by the proximity switch SW, and the read signal is input to the central control unit CPU. And the central control unit CPU has a counter corresponding to the grinding wheel 19a.
C ₁ , C ₂ and counters C ₃ , C ₄ corresponding to the grinding wheel 19b
Are connected, and the counters C ₁ , C ₂ , C ₃ , and C ₄ count the output from the central control unit CPU based on the proximity switch SW, and when reaching a predetermined count value, the transmissions 21a and 21b are The conversion signal is added.

These counters C ₁ and C ₃ are detection rollers 24a and detection rollers 24b.
It is set from the position directly below the to correspond to the distance of the grinding wheel 19a, to just below the position of 19b, also counter C _2, C ₄
Is set to the sum of the count values of the counters C ₁ and C _{3 and} the count values corresponding to the widths of the front bar x and the rear bar y of the frame processed material w.

As a result, the frame processed material w moves by a predetermined distance,
The front edge y of the front and rear crosspieces x and y of the frame material w is the grinding wheel 19a, 1
When it arrives just under 9b, the central control unit controls the drive motor with a transmission by the generation of the count exhaust signal of the counter C ₁ (C ₃ ), and the grinding wheel rotates at a low speed. Further, when the width dimension from the front edge f to the rear edge r of the front and rear crosspieces x and y of the frame work material w passes, the grinding wheel receives a steady speed by the count exhaust signal of the counter C ₂ (C ₄ ). It will return to rotation.

The timing instructing means 30b has an advantage that the timing can be surely set even when the material feeding speed varies or the material feeding speed varies due to some load. In addition, in the above-described embodiment, the present invention is applied to the grinding of the frame-shaped frame processed material w, but it is also applicable to a normal single plate. In this case, the leading edge or trailing edge is slow,
It will be subjected to grinding. Further, in the above embodiment, the grinding wheels 19a and 19b are roll brushes, but they can also be applied to ordinary grinding rolls.

Further, although the transmissions 21a and 21b of the above-described embodiment use electric means that utilize an inverter as the speed changing means, they may be mechanical means such as gear meshing control.

<Effects of the Invention> As described above, the present invention, when the front and rear rails x, y of the frame processed material arrive, perform light grinding on the front and rear rails x, y so as to reduce the rotation speed of the grinding wheel, As a result, the amount of grinding at each edge is eased, and the vertical bar between the front and rear bars x and y is reduced.
Since z and z are ground at an optimum speed, the edge of the frame workpiece w can be prevented without deteriorating the finished state, and good grinding and polishing can be performed as a whole. And so on.

[Brief description of drawings]

1 is a front view, FIG. 2 is a left side view of the same, FIG. 3 is a conceptual diagram showing a timing command means 30a, and FIG. 4 is a concept showing a timing command means 30b. FIG. 5 and FIG. 5 are schematic perspective views showing grinding of the frame processed material w. 2 ... Feeding device 4 ... Driving feeding roll 7 ... Feeding belt 19a, 19b ... Grinding wheel 20a, 20b ... Driving motor 21a, 21b .. Transmission 24a, 24b .. Detection roller 30a, 30b ...... Timing command means 35 …… Slit plate w …… Frame work material, f …… Leading edge, r …… Rearing edge LS ₁ , LS ₂ …… Limit switch T ₁ , T ₂ , T ₃ , T ₄ … … Timer C ₁ , C ₂ , C ₃ , C ₄ …… Counter

Claims (2)

[Claims] 1. A grinding wheel is arranged above a material feeding device with a rotary shaft orthogonal to the material feeding direction, wherein the grinding wheel is capable of speed conversion in at least two modes of low speed rotation and steady rotation. With the drive motor with transmission to drive, and the arrival of the frame processed material provided in front of the grinding wheel,
And detectors to detect the passage, the timer T ₁ the transport time t ₁ up to just below the grinding wheel from directly below the detector is set to (T _3), the transport time t ₁ and the frame was workpiece w Before and after
Sum of transfer time t ₂ from the leading edge f of x, y to the trailing edge r and t
Timer T ₂ (T ₄ ) set to ₃ and timer T ₁ (T ₃ )
The drive motor with transmission is controlled by the time-up signal of to rotate the grinding wheel at a low speed, and the drive motor with transmission is controlled by the time-up signal of timers T ₂ and T ₄ to rotate the grinding wheel at a constant speed. A grinder for woodworking, comprising: a timing command means including a control device. 2. A grinding wheel is arranged above a material feeding device with a rotary shaft being orthogonal to the material feeding direction, and the grinding wheel is capable of speed conversion of at least two modes of low speed rotation and steady rotation. With the drive motor with transmission to drive, and the arrival of the frame processed material provided in front of the grinding wheel,
A detector that detects passage and a counter C ₁ (C ₃ ) with a value corresponding to the distance from immediately below the detector to immediately below the grinding wheel, and the distance and the front and rear of the frame workpiece w Sum of width dimension from front edge f to rear edge r of crosspieces x and y t ₃
A counter C ₂ (C ₄₎ which is set a value corresponding to the grinding wheel rotating at low speed and controls the drive motor with gear unit by counting digestion signal counter C ₁ (C _3), counter C ₂ (C _A grinder for woodworking, comprising: a central control unit for controlling a drive motor with a transmission by a count exhaustion signal of ₄ ) to rotate a grinding wheel at a constant speed, and a timing command unit.