JPS6192807A - Speed adjusting compensator 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 (Objective of the Invention) The present invention aims to improve the cutting speed and discharge speed caused when a veneer IJ plate cut and discharged by a veneer race equipped with a knife and a nose bar is directly conveyed to a subsequent process. The purpose is to automatically correct the speed difference between the speed and the speed difference, and eliminate the decrease in veneer yield and process efficiency caused by breakage or bending of the cut veneer due to the speed difference. .

(Structure of the Invention) As illustrated in an example of its implementation, the present invention provides an appropriate space on the slope 7a of the frustum 7 that supports and covers the knife 6 of the veneer lace 1, and on the unloading container 8 provided in series with the slope 7a. is formed, and the device is arranged so that the cut veneer 4 is in a tensile state or a slack state in the space. Also, raw water 9 is used for veneer lace 1.
A speed N-1 generator 11 that can measure the number of rotations of the spindle 10 that rotates, and a position indexer 12 such as a variable resistor or variable transformer that can measure the position of the frustum 7.3 are combined. By calculating the cutting speed of veneer A7 race 1,
A uniform speed controller 14 is provided which sends a speed command signal to a variable speed motor 13 that drives the carry-out conveyor 8, and the speed control unit 14 transmits a speed command signal to a variable speed motor 13 that drives the carry-out conveyor 8. The cut veneer 4 is conveyed to the subsequent process by synchronizing the conveyance speeds.

However, the cutting speed of the veneer race 1 and the general output speed of the unloading conveyor 8 are actually not mutually exclusive due to the calculation error of the uniform speed controller 111 and the difference in elongation rate of the material of the veneer veneer immediately after cutting. A speed difference occurs, and the tension state of the cut veneer 4 (see FIG. 2) or excessive slack state (
(see FIG. 4), it is rare for the wire to remain stable for a long time in a slightly loosened state as illustrated in FIG. Therefore, 1 of the 1 public conveyor 8
Although the general speed will be corrected, the excessive slack state described above is an abnormal situation in the speed control a, 11, and can be easily eliminated by manual readjustment of the speed limiter 140. Therefore, it is possible to eliminate this and automatically detect and compensate for the range from the slight slack state to the tensile state.
In order to be able to send a signal, a slack detector 15 consisting of a reflective limited distance photoelectric switch or the like is placed facing the space, and when the tensile state of the cut veneer 4 reaches its limit, it turns on and off.
The device is designed to emit a tension detection signal of the F output, or to emit an analog output tension detection signal steplessly from a slight slack state to the limit of the tension state. Further, the tension detection signal detected by the slackness detector 15 is superimposed on the speed command signal sent from the first front speed controller 14 to the variable speed motor 13, and the tension detection signal is superimposed on the speed command signal sent from the first front speed controller 14 to the variable speed motor 13, and the tension detection signal is transmitted by an appropriate amount, for example, 50 to 1.
A correction controller 16 is provided so as to be able to correct the general output speed of about 0.00 meters per minute (in contrast, an appropriate amount of about 5 to 10 meters per minute to the deceleration side), and the constant speed i controller 14 and the speed change This is inserted between the motors 13 to automatically detect the loosening of the cut veneer 4 during the unloading process, and to automatically control the speed to maintain a slight slack as shown in FIG. 1 at all times. In addition, the above-mentioned slack detector 15 is used to correct the deviation of the
There are various methods for detecting the loosening of the cut veneer 4 during the unloading process, such as a photoelectric method, a mechanical method, and an ultrasonic method. The type photoelectric switch 15a has a light emitting section 17 and a light receiving section 1.
L from outside the detection area, which is shown by a chain line.
Turns ON when the cut veneer 4 reaches the detection distance shown in the figure.
・A device that is capable of detecting slack in the cut veneer 4 in a non-contact state by emitting an OFF output or by continuously emitting an OFF output within the detection area. It is.

Next, the present invention also detects an excessive slack state of the cut veneer 4 caused by an abnormal situation in uniform speed control as illustrated in FIG.
For the unexpected 11 states that transmit the signal, a signal output that lasts for a limited time and a signal output that does not last for a limited time are distinguished between the slack XO device 15 and the correction controller 16, and the latter is discussed. If the signal output does not last for a limited time, or if the signal output is intermittent due to excessive slack as shown in Fig. 4, the signal output can be cut off and eliminated by a time controller such as a timer. 19 can be inserted into the control circuit to prevent the occurrence of erroneous signals.

(Effects of the Invention) As described above, the present invention safely accommodates the tensile state and slack state caused by the discrepancy in uniform speed control between the cutting speed of the cut veneer 4 discharged from the veneer A7 race 1 and the general output speed. A space is formed on the slope 7a of the truncated cone 7 on the knife 6 side and on the conveyor 8, and the most frequently occurring tension or slack state of the slope 4 is created during cutting in the space. This device automatically detects the slackness of the condition with the slackness detector 15 and automatically corrects the slippage of the uniform speed control so as to maintain a slight slackness as illustrated in FIG. 1 at all times. This invention completely eliminates the reduction in veneer yield and process efficiency caused by breakage or bending of the cut veneer 4 due to the speed difference between the cutting speed and the conveyance speed, and this invention has significantly contributed to streamlining the veneer cutting process.

[Brief explanation of drawings]

The figures do not show an example of the implementation of the present invention, and FIG. 1 is a side view, FIG. 2 is an explanatory diagram of a cut veneer in a tensile state,
FIG. 3 is an explanatory diagram of the operation of the slack detector, and FIG. 4 is an explanatory diagram for detecting excessive slack in a cut veneer. 2... Nose bar, 3.7... Silver white, 4... Cutting veneer, 6... Knife, 8... Carrying out conveyor, 10...
... Spindle, 13... Variable speed motor, 14... Speed constant controller, 15... Slack detector, 15a... Reflective limited distance photoelectric switch, 16... Correction controller, 19
...Timed controller.

Claims (2)

[Claims] (1) Leave an appropriate space above the slope of the knife-side planer stand and the carry-out conveyor connected thereto, and transmit a speed command signal for the variable speed motor that drives the carry-out conveyor from the rotational speed of the spindle and the position of the plane stand. A veneer race is provided with an equalization speed controller in the control circuit to equalize the cutting speed of the veneer and the speed of unloading the veneer, and the veneer race is installed at a position near the veneer discharge end of the knife-side planer stand to detect the slack state of the veneer. A correction controller is provided in the control circuit to correct the speed command signal of the speed equalization controller to the speed reduction side by an appropriate amount based on the tension detection signal from the slackness detector. Uniform speed correction device for veneer lace. (2) A time controller is provided in the control circuit of the slack detector and correction controller to discriminate and eliminate an erroneous signal from the slack detector transmitted from the excessive slack of the cut veneer formed in the space. A uniform speed correction device for a veneer race according to claim 1.