JPS59143601A - Method and device for detecting position of retreat and stoppage of tool rest in veneer lathe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Object of the Invention) The present invention aims to mechanically accurately detect the retraction stop position of the tool post in accordance with the log diameter. The present invention relates to a stop position detection method and apparatus.

(Prior art) Conventionally, determining the backward stop position of a veneer race turret
The maximum diameter of the log was determined by visual judgment by the worker. For safety, the turret is moved back far compared to the diameter of the log, and during cutting, the turret is fed at high speed until just before cutting, and then the turret is switched to step feed to cut the log. Ta. Therefore, the retraction of the turret and the high-speed forward feed of the turret that is not involved in cutting the raw wood become larger, and the time required to excite the veneer lace becomes shorter.
There were problems such as the need for a mechanism to quickly switch from high-speed feed to step feed when the turret moves forward.

Furthermore, the positions for switching back and blocking the tool post, high-speed forward feed, and step feed are determined by the operator's visual judgment.
Due to this error in judgment, the retreating fence of the tool post is too slow compared to the log diameter, or the forward feed filter is too large, and the log comes into contact with the cutter, and in 1, there is no collision at all. I couldn't say that.

Due to the above-mentioned circumstances, worker fatigue increases, danger is involved, and automatic operation of veneer lace by unmanned operation is difficult.

(Structure of the Invention) The present invention has been made against the background of the above-mentioned prior art, and the gist thereof is to use a light beam, laser beam, ultrasonic wave, etc., which is attached vertically to the transfer surface of logs so as to be able to rise and fall freely. The maximum diameter of the log is detected by the log maximum diameter detection means used,
The lifting and lowering of the log maximum diameter detecting means and the advancing and retracting of the tool post were synchronized with each other so that the ratio between the lifting lid and the advancing/retracting filter was 2=1, and the log maximum diameter detecting means detected the maximum diameter of the log. This involves transmitting a signal to the tool rest, causing the tool rest to move back to an appropriate position corresponding to the diameter of the log, and then stop.

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

In Figures 1 and 2, a carry-in conveyor l for carrying in logs W is installed horizontally on the i side of the veneer race L, and between this carry-in conveyor l and the veneer race L, A pair of vibration materials 2 are slightly tilted to cross the rack.The front end of the vibration materials 2 temporarily holds the raw wood W that has rolled on the member 2, and rotates around the shaft 3. A pair of log input members 4 are provided for inputting the log W held by moving between both chucks C of the veneer race L.

A phototube box 6 is attached to the front surface 5a of one headstock 5 of the veneer race L perpendicularly to the vibration member 2.

In addition, in FIGS. 1 to 4, two guide rods 9 are supported by an upper plate 7 and a lower plate 8 fixed to the top and bottom of the photocell box 6. Elevating body 1 via bearing 10
1 is slidably attached to the elevating body 11, and a phototube 12, which serves as a means for detecting the maximum diameter of logs, is integrally attached. A guide pulley 14 is attached to the center of the upper plate 7 via a shaft 13. Also, the first
As shown in the figure and FIG. 5, the side surface 5b of the headstock 5
Another guide pulley 15 is attached substantially below the guide pulley 14 at , and another guide pulley 17 is attached in front of the forward end position of the lower end of the tool rest 16 on the side surface 5b of the headstock 5. pulley 17
An adjustment bolt 19 is screwed into a bracket 18 attached diagonally below the tool post 16 so as to be freely movable in the direction of movement of the tool post 16.

On the other hand, the tool rest 16 is configured to be able to move forward and backward in a direction inclined at a predetermined angle with respect to the horizontal.
A bracket 20 is attached to the lower end surface 16a that does not interfere with the movement of the
A moving pulley 21 is attached via. or,
One end of the rope 22 is fixed to the elevating body 11, this rope 22 is sequentially hung on the guide pulley 14.1'5.17 and the moving pulley 21, and the other end of the rope 22 is attached to the tip of the adjustment bolt 19. When the turret 16 is fixed and moved back, the rope 22 is gradually pulled and the elevating body 11 with the phototube 12 attached rises.When the turret 16 moves forward, the elevating body 11 descends while pulling the rope 22 by its own weight. is configured to do so.

As is clear from the above explanation, the ratio of the up/down movement QL of the phototube 12, which is the means for detecting the maximum log diameter, to the movement ML of the tool post 16 is 2:1. Therefore, when the phototube 12, which is the log maximum diameter detection means, rises and detects the maximum diameter of the log W, the tool rest 16 moves back by half the amount of rise of the phototube 12 and stops.

Here, when the log W is put between the two chucks C, a photocell 1 which is the log maximum diameter detection means is used to prevent the log W from coming into contact with or colliding with the cutter 23 attached to the tool post 16.
2 detects the maximum diameter of the log W and the tool rest 16 stops, the length of the rope 22 is set so that a predetermined gap t is formed between the cutter 23 attached to the tool rest 16 and the log W. is adjusted, and the size of the gap t can be freely adjusted by moving the adjustment bolt 19 back and forth! I11 set up.

Also, in Fig. 1, 24 is a roller that serves both for centering and for driving the outer circumference of the raw wood W held between the chucks C, and the three rollers 24 synchronize with each other and approach the fine point of the main shaft. - Constructed so that they can be separated.

Further, in Fig. 2, 25 is a reflecting plate for reflecting the light beam emitted from the phototube 2, and this reflecting plate 25 and
The line segment connecting the photocell tube 12 is inclined at a predetermined angle with respect to the axis of the raw wood W, so that even if the diameter of the raw wood W to be input changes, the maximum diameter of the raw wood W can always be detected. be.

In addition, in the above embodiment, the phototube 12 has both light emitting and light receiving functions.
Although the log maximum diameter detecting means is constituted by the and reflecting plate 25, the log maximum diameter detecting means may be constituted by a light emitting phototube and a light receiving light illtw, and furthermore, a laser beam or an ultrasonic wave may be used. The log maximum diameter detection means may be configured by the transmitter and the receiver.

Also, when the tool rest 16 moves forward, the elevating body 11 due to its own weight.
descends and the rope 22 is pulled, but if the resistance of the rope 22 is large and the rope 22 cannot be pulled by the weight of the elevating object 11 alone, for example, the elevating object! 1 and the lower plate 8 may be connected by a tension spring (not shown), and the elevating body 11 may be forcibly lowered by the tensile force of this tension spring to pull the rope 22.

Note that 26 in the figure indicates a window provided in the phototube section 6.

(Operation of the Invention) Next, to explain the operation of the present invention, when the log W is transferred from the carry-in conveyor 1 to the member 2 in FIGS. 1 and 2, the log W rolls and As shown by the two-dot chain line, the raw wood is temporarily held by the raw wood inputting member 4. In this state, the tool rest 16 is stopped at the forward end position as shown by the two-dot chain line.

After that, when the body of the tool rest 16 (not shown) is activated and moved backward, the rope 22 is pulled as the movable pulley 21 moves backward, and the elevating body 11 with the phototube 12 attached moves to the log W. When the light beam emitted from the phototube 2 rises in a direction perpendicular to the rolling surface and is reflected by the reflector plate 25 and received, the maximum diameter of the log W is detected, and this signal is used to drive the tool post 16. Transmitted to the device and the turret 16
moves backward and stops at the position indicated by the solid line. Here, the retraction 111L of the tool rest 16 is the number of the rising scale of the phototube 12, which is a means for detecting the maximum diameter of the log.
It retreats by approximately a moon of its diameter and then stops.

Then, while keeping the three rollers 24 separated from the axis of the main shaft, the log loading member 4 is rotated in the direction of arrow P to input the log W between both chucks C of the veneer race L. After that, when the three rollers 24 are moved closer to the axis of the main shaft to hold the log W, the log W is
The centering of 9 is done. In this state, as described above, a predetermined gap t is formed between the blade 23 of the blade base 16 and the original W held between the chucks C.

Next, the edge surface of the raw wood W held by the three rollers 24 is clamped by the chuck C, and then the cutting a device of the tool rest 16 is activated and fed forward to cut the raw wood 2W. When the turret 16 moves forward, the elevating body 1 to which the photocell l is attached
1 descends while tensioning the rope 22 due to its own weight.

(Effects of the Invention) The present invention synchronizes the lifting and lowering of the log maximum diameter detection means and the movement of the cutting tool so that the ratio of the lifting amount to the advancing and retreating amount is 2:, so that visual inspection is not required as in the conventional method. Without relying on judgment, it is possible to mechanically accurately detect the retraction stop position of the tool post in accordance with the log diameter, and to move the tool post back to an appropriate position and stop it. For this reason, the amount of advance of the blade bit table not related to cutting can be minimized,
Conventional glue @machining [Feed the turret at high speed until the front,
There is no need to switch to step-feeding after that, and it becomes possible to advance the tool rest by step-feeding from the beginning.

j Also, the retraction stop position of the tool post can be accurately detected mechanically in accordance with the diameter of the log.
It is possible to reliably avoid a situation in which the blade contacts or collides with the cutter.

Furthermore, the turret's retraction stop position is mechanically and accurately detected in accordance with the diameter of the log without relying on the visual judgment of the operator, and the turret is retracted to the appropriate pressure position and stopped, making the work easier. This reduces human fatigue, improves safety, and improves veneer lace automation by making it unmanned.
Driving becomes possible.

[Brief explanation of drawings]

FIG. 1 is a side view showing only the main part of a veneer race L equipped with a tool post retraction position detection device according to the present invention, and FIG.
The figures are the same < plan view, FIG. 3 is a plan view of the photocell 6,
Figure 4 is a front view, and Figure 5 is X-XI of Figure 1.
&I! ffi is a view taken in the direction of the arrow. (Explanation of symbols of main parts) 2...Brush material 5...Main
Axis stand 6... light'd13m 11...
...Lifting body 12... Phototube (Ig
Tree maximum diameter detection means) 14, 15. 17... Guide pulley ~ 21... Moving pulley 22...
...Lobe Figure 2C Figure 4 Figure 5

Claims (2)

[Claims] (1) The maximum diameter of the log is detected by a log maximum diameter detection means that uses light beams, laser beams, ultrasonic waves, etc., and is mounted vertically to the rolling surface of the log so as to be vertically movable. The vertical movement of the log and the forward/backward movement of the tool post are synchronized with each other so that the ratio of the vertical movement to the forward/backward amount is 2:l, and the log maximum diameter detection means transmits a signal indicating the maximum diameter of the log to the tool post. A method for detecting a backward stop position of a tool post in a veneer race, characterized by stopping the backward movement of the tool post. (2) A means for detecting the maximum diameter of logs using light beams, laser beams, ultrasonic waves, etc. is attached to the front of the headstock of the veneer lace so that it can move up and down in a direction perpendicular to the rolling surface of the log, thereby interfering with the movement of the tool rest. At the same time, a plurality of guide pulleys are installed at required points on the side of the headstock to guide the rope, and one end of the rope is fixed to the log maximum diameter detection means. At the same time, the rope is hung on each of the guide pulleys and the moving pulley,
The other end is fixed near the forward end position of the tool post, and the lifting and lowering of the log maximum diameter detection means and the advancing and retracting of the tool post are synchronized with each other so that the ratio of the lifting amount and the advancing and retreating amount is 2=1. 1. A device for detecting a backward stop position of a tool post in a veneer race, characterized in that it detects a backward stop position of a tool post corresponding to a log diameter.