JPH0242610B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the speed of the front and rear conveyance tables for a bar cutting machine when dividing a large number of straight bars into fixed lengths and trimming the leading and trailing ends thereof. It is.

Conventionally, in this type of group-feed straight bar cutting line table, as shown in FIGS. The conveyance speed control of the front and rear conveyance tables 4a and 5a for the cutting machine, which are composed of rollers 6a and 7a, is detected by bar passage detectors 10a and 10b provided at one location on the rear conveyance table 5a side, as shown in FIG. As shown in FIG. 1, since a single deceleration method was adopted from the rated speed a' to the deceleration b', it was extremely difficult to control the control stop position when the rated conveyance speed was increased.

In addition, there is a high possibility that an excessive impact force will be applied to the sizing stopper 9a for positioning the sizing material shown in FIG. This significantly impeded the length accuracy (dimension l' in FIG. 8), and also affected product yield and productivity.

In order to avoid these disadvantages, the present invention controls the conveyance speed of the material to be cut in multiple stages.
In other words, by controlling the front and rear conveyor tables for the bar cutting machine from the rated speed to near zero through multiple stages of deceleration control, the impact force against the sizing and positioning stopper for the sizing material is minimized, and the bar The purpose is to eliminate bouncing of the tip of the material, improve cutting accuracy, product yield, and quality, and further reduce the time required for sizing alignment due to high-speed conveyance, and improve productivity through high-efficiency processing. .

The method of the present invention will be explained below with reference to the drawings.

The straight bar cutting device includes a straight bar cutting machine main body 1 consisting of a lower cutter 3 and an upper cutter 2 that can be moved up and down, and a motor installed on the front and rear surfaces of the machine to convey the material to be cut. It is composed of a cutting machine front conveyance table 4 consisting of an arrangement of six groups of rollers, and a cutting machine rear conveyance table 5 consisting of a similar arrangement of seven groups of motorized rollers.

As shown in FIGS. 1 to 3, the method for cutting a large number of straight bars by group feeding is as shown in FIGS. The straight bars 14 are conveyed simultaneously by driving a group of 6 rollers that are rotated through the straight bars 14, and the straight bars 14 are stopped in a state beyond the cutting position of the bar cutting machine to check the size, shape, or quality of the straight bars' tips. The crop cut material 16 at the tip of the straight bar is cut off by operating the upper and lower cutters 2 and 3 of the bar cutting machine at the location corresponding to the mechanical defect.

Next, the straight bar 14 whose tip has been cut approaches the rear of the cutting machine, passes through the tilting table 8, and is moved to the front by the drive rotation of the tip rollers and the rollers 6, 7 with respective motors 19, 20, which are interlocked by the drive chains 17, 18. A fixed size positioning stopper 9 is conveyed in the direction of the arrow on the rear conveyance tables 4 and 5 and is provided on the rear conveyance table 5 so as to be able to move up and down so as to wait at a distance of a fixed length cutting length l from the cutting point. The tip of the straight bar hits the bar, and the bar stops in the state shown in FIGS. The front and rear conveyance table speed control first stage detection transmitters 10 of the cutting machine detect the passing of the leading edge of the material to be cut and issue an activation signal to both sides of the rear conveyance table 5 of the cutting machine at predetermined intervals. A second stage detection transmitter 12 and a second stage detection transmitter 13 for speed control of the conveyance table and the same receiver 13 are installed in multiple stages on the front and rear sides of the same cutting machine as described above, sequentially closer to the sizing positioning stopper 9 side. , the rated speeds of the rear conveyance tables 4 and 5 are controlled to be gradually decelerated in multiple stages. To explain this with reference to FIG. 9, after crop cutting the tip of the straight bar, the front and rear conveying tables 4 and 5
The table conveyance speed is rated speed a, and the straight bar is conveyed to the control command transmission point of the front and rear unloading table speed control detection transmitter 10 and receiver 11. Detects the tip and issues the first stage deceleration command at the same time.

In response to this deceleration command signal, the motors 19 and 20 of the motorized rollers 6 and 7 of the front and rear conveyance tables 4 and 5 lower their rotation speeds, and perform a primary deceleration b of the table conveyance speed to the deceleration setting value. The bar is conveyed, and then the straight bar is sent to the front and rear conveying table speed control detection transmitters and control command transmission points of the receivers 12 and 13 of the cutting machine. (The number of deceleration control stages may be any number of stages depending on the rated speed of the table, until the final speed is zero.) Before and after this final stage, the rear transport table speed control detection transmitter and receivers 12 and 13 are At the same time as detecting the tip of the bar, a control signal is issued, and pulse control is performed by acting on the rotation pulses of the roller motors 19 and 20 of the front and rear conveyance tables 4 and 5 until the conveyance speed is near zero, The motor speed is gradually lowered, and when the tip of the bar reaches the point of the sizing positioning stopper 9 of the sizing material, the second deceleration c is applied so that the table conveyance speed is lost, and the motor is moved directly to the sizing positioning stopper 9. The collision force of the bar material is made slight and a fixed length of a predetermined length l is ensured. At the same time, the upper and lower cutters 2 and 3 of the bar cutting machine main body 1 operate to cut the straight bar 14 into a fixed length, and as shown in FIG. In addition to feeding out by the roller drive of No. 5, the front conveyance table rollers are also moved, and after cutting, measuring and cutting to a fixed length are repeated again in the same manner as described above.

As described above, according to the method of the present invention that controls the conveyance speed of the table for a bar cutting machine in multiple stages, no matter how long the bar is fed directly in groups, disturbances occur in the tip alignment during sizing. Highly accurate sizing is possible without any problems. In addition, by increasing the number of deceleration stages even if the speed of the conveyance table is set as high as possible, it is possible to easily and accurately stop the straight bar at a predetermined position, which leads to an improvement in cutting work efficiency. This contributes to improved productivity as well as improved cutting accuracy and product yield.

[Brief explanation of the drawing]

Figure 1 is a plan view of the front and rear conveyance tables of a straight bar cutting machine according to the method of the present invention, and Figure 2 is a sectional view taken in the direction of the cutting line in Figure 1, showing the tip of the straight bar being cut during cutting. Figure 3 shows the previous state. Figure 3 is a cross-sectional view taken in the direction of the cutting line when the tip of the straight bar is cut from the state shown in Figure 2. Figure 4 shows the state before cutting the straight bar to a specified length. A plan view, FIG. 5 is a sectional view of FIG. 4, FIG. 6 is a sectional view showing the conveyance state after cutting the straight bar material in FIG. FIG. 8 is a plan view of the rear conveyance table, FIG. 8 is a sectional view in the direction of the cutting line in FIG. 7, FIG. 9 is a speed control diagram of the front and rear conveyance tables of the present invention, and FIG. A speed control diagram of the front and rear conveyance tables of the cutting line is shown. 1... Bar cutting machine main body, 2... Cutting machine upper blade,
3... Cutting machine lower blade, 4... Cutting machine front conveyance table, 5... Cutting machine rear conveyance table, 6, 7...
... Roller with motor, 9 ... Fixed size positioning stopper, 10, 12 ... Front and rear conveyance table speed control detection transmitter, 11, 13 ... Receiver, 1
4...Straight bar material, a...Rated speed, b...First reduction, c...Second or final reduction.

Claims (1)

[Claims] 1. In a straight bar cutting machine that transports a large number of straight bars by the front and rear conveyor tables of the roller-driven type on the front and rear sides of the bar cutting machine, and cuts a large number of straight bars at the same time into fixed lengths and trims the leading and trailing ends to align them. After crop-cutting the tip of the straight bar, the straight bar is transported at the rated speed of the front and rear transport tables, and the bars are placed on both sides of the table in front of the fixed size positioning stopper provided on the rear transport table. Before detecting the passage of the leading edge of the material and issuing an activation signal, the rear conveyance table speed control detection transmitter and the same receiver are installed in multiple stages at intervals to gradually reduce the conveyance speed of the front and rear conveyance tables in multiple stages. A method for controlling a conveyance table for a bar material cutting machine, characterized in that the table conveyance speed is controlled to near zero when the tip of the straight bar material reaches a fixed size positioning stopper.