JPH078450B2 - Automatic measuring device for straight material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to an automatic measuring and cutting device for linear materials such as reinforcing bars.

<Prior art> A so-called stopper, which stops an advancing object, is fixed at a required position on the measuring rod, and the tip of the linear member advanced along the measuring rod resists the urging of the measuring rod together with the stopper. The measuring instrument cutting device for automatically returning the measuring rod after cutting while the rear portion of the linear member is being cut by a flexible shearing device which is fixed to the rear end of the measuring rod and moves integrally with the measuring rod. For example, it is known as seen in Japanese Examined Patent Publication No. 53-17189. Since both the stopper and the shearing device are fixed to the measuring rod,
If the gap between the stopper stop contact surface and the shearing blade surface of the shearing device is adjusted to the required length of the linear material such as reinforcing bar to be cut, no matter how the stopper is pushed by the tip of the linear material, the shearing Since the blade moves together, it can always be sheared to the required length. As a result, the rebar can be cut to a fixed length without being stopped and the productivity can be improved, so that it is an indispensable device for the supply section of the rebar for welding wire mesh.

<Problems to be Solved by the Invention> For example, in the case of a welded wire net, a large number of reinforcing bars are required to form one wire net, but the number of wire nets having the same size is not so large. It is necessary to manufacture wire mesh with different order sizes one after another.

When the wire mesh size changes, the cutting length of the rebar also changes. Therefore, as in the above-mentioned publication, although the push screw is not visible in the conventional cutting device, the push screw that fastens and fixes the stopper to the measuring rod is loosened each time, and the stopper is replaced by a new one. It was necessary to manually move it to the position and tighten the set screw to re-fix it. The setting work of the stopper positioning remains as one of the few manual works of the automatic wire mesh manufacturing apparatus, and has been a problem in terms of labor, measuring accuracy, and downtime.

According to the present invention, the cutting length changing and setting work which has been conventionally performed manually can be automated without deteriorating the measuring performance of the apparatus.
The position of the stopper with respect to the measuring rod can be freely changed and set at the centralized control position.

<Means for Solving the Problem> The automatic measuring device for a linear material of the present invention fixes the stopper at a required position of the measuring rod and stops by the tip of the linear material advanced along the measuring rod. The measuring rod is pushed forward together with the stopper, and the measuring rod is automatically returned after cutting while the rear portion of the linear member is being moved by a movable shearing device that is fixed to the rear end of the measuring rod and moves integrally with the rod. In the measuring scale cutting device, a setting device consisting of a servomotor-driven fixed-position screw shaft and a moving female screw for positioning the stopper forward and backward along the measuring rod, and an automatic attachment to the measuring rod attached to the stopper, It is characterized by comprising a releasing chuck mechanism and an automatic connecting device for connecting the stopper to the moving female screw of the setting device only when the stopper is positioned.

<Operation> The present invention comprises a setting device for automatically positioning a stopper for determining a cutting length, which is composed of a servomotor-driven fixed-position screw shaft and a moving female screw engaging with the fixed-position screw shaft. Move the moving female screw a required distance to move the stopper forward and backward. Since the moving female screw and the stopper are connected by an automatic connecting device which can be connected and released by pushing and pulling the fluid pressure cylinder, when the stopper performs its function by releasing the connecting portion after positioning the stopper. Moves lightly without being restrained by the automatic setting device.

Another heavy load, the automatic fixing device, that is, the device that fixes the positioned stopper to the measuring rod is attached to the stopper, but it does not automate the conventional push screw but adopts the automatic chuck mechanism, so it is more than the push screw. Stable, relatively lightweight, suitable for control by a fluid pressure cylinder.

That is, according to the present invention, the stopper position setting device is separated from the stopper after positioning, and the fixing mechanism of the stopper and the measuring rod is provided with a lightweight automatic chuck attached to the stopper, so that the centralized control can be performed without lowering the measuring performance. Enables automatic positioning and fixation.

<Embodiment> FIG. 1 is an elevational view of an embodiment in which the present invention is applied to a reinforcing bar supply section of an apparatus for manufacturing a reinforcing bar net for concrete. Reinforcing bar B straightly stretched by a straight line machine travels on guide path 2 from guide roller 1 at the left end of Fig. 1 and enters the automatic measuring cutting device of the present invention.

As in the conventional scale-cutting device, the stopper 10 is fixed to a required position of the scale rod 3 and the movable shearing device 4 is fixed to the other end of the scale rod 3, so that the tip of the rebar B that has entered is fixed. When the stopper 10 is pushed (a little before that in the figure), the shearing device 4 also moves to the right and shears the rear portion of the reinforcing bar B to a desired size. The shearing device 4 is well known and does not operate at the standby position in FIG. 1, and when the reinforcing bar B pushes the stopper 10 and the shearing device 4 moves to the right together, a cam or the like for pressing down the upper blade 4a is applied. The pressure mechanism works effectively to shear the reinforcing bar B. Therefore, even if the stopper 10 is moving,
If the distance l between the shearing position of the shearing device 4 and 10 is adjusted to the required length of the reinforcing bar B, the reinforcing bar B can always be cut to the required length, and therefore the feeding of the reinforcing bar B does not have to be stopped. The stopper 10 shown in the figure is of the present invention, and conventionally, the plate piece was simply tightened and fixed to the measuring rod 3 with a set screw.

A bearing 5 for supporting the measuring rod 3 in parallel with the guide path 2 of the reinforcing bar B,
The traction spring 6 and the spring seat 7 for returning the measuring rod 3 pushed rightward are conventional ones.

The parts added by the application of the present invention are a setting device 12 including a fixed position screw shaft 12a for driving a servo motor 11 for pushing and positioning the stopper 10 along the measuring rod 3, and a moving female screw 12b screwed to the fixed position screw shaft 12a. The chuck mechanism 13 attached to the stopper 10 for automatic fixation and release to the measuring rod 3 and the fluid pressure cylinder 14 of its controller, and the stopper 10 is connected to the moving female screw 12b of the setting device 12 only when the stopper 10 is positioned. The coupling device 15 and the like. Screw shaft that rotates in the fixed position of the setting device 12
The ball screw 12a and the female screw 12b that can be moved by the screw 12a are light in operation. Both ends of the screw shaft 12a are supported by bearings 19, and one end is rotated by the servomotor 11.The rotation speed is the number of distances from the previous position of the stopper 10 to the new position divided by the screw pitch of the screw shaft 12a. , Its calculation,
It is needless to say that the command is given by the control unit having a small computer, and the description thereof is omitted because it is a well-known technique.

The female screw 12b is a protrusion 1 that engages with the upper guide rail 18.
Since it is provided with 2c, it moves without rotating together with the screw shaft 12a. A bracket 12d for coupling with the stopper 10 projects from the lower front and rear of the female screw 12b to fix the two horizontal guide rods 15a on the left and right of the coupling device 15 and to project the pressure end 16a between them. The fluid pressure cylinder 16 is attached.
The left and right horizontal guide rods 15a pass through the left and right through holes of the connecting projection 10a provided on the upper portion of the stopper 10 and guide the movement (about 10 mm) of the stopper 10 by abutting the reinforcing bar, but do not restrain it.

In order to change the position of the stopper 10 to connect with the female screw 12b side, the pressurizing end 16'a of the connecting fluid pressure cylinder is projected as shown by the chain line in FIG.
Is pressed against the tip of the opposite side adjusting screw 17 having a full movable range along the horizontal guide rod 15a to be restrained. With this, the stopper 10 and the female screw 12b for advancing and retracting the stopper 10 are connected. Therefore, if the servomotor 11 is driven in the reverse direction, the screw shaft 12a rotates, the female screw 12b moves, and the stopper 10 moves by the moving distance. Let

When the positioning of the stopper 10 is completed in this way, the pressurizing end of the connecting fluid pressure cylinder 16 is retracted to release the constraint, and the chuck mechanism 13 is pulled back from the fluid pressure cylinder 14 and fixed to the measuring rod 3 as described later. Let In this example, the chuck mechanism 13 is a ball chuck. This is a commercial product, and the upper half of the cross section shown in FIG. 2 shows the chuck released state and the lower half shows the chuck fixed state. Cylindrical chuck body 13 on measuring rod 3
A and the ball retainer 13b are loosely engaged, and only the latter is screwed to the stopper 10. In the main body 13a, both wings are simultaneously driven by the two fluid pressure cylinders 14, and the rod 14 'of the cylinder 14 is projected to separate the main body 13a from the ball retainer 13b as shown in the upper half of FIG. It is designed so that it can be pulled up like the lower half of Figure 2. This chuck body 13a
Inside, that is, between the measuring rod 3 and the conical surface on the inner circumference of the chuck body 13a, a large number of balls (steel balls) 20 and a coil spring 21 for pressing these to the large diameter side of the conical surface are contained. This is a well-known structure in which the fluid pressure cylinder 14 pushes the ball 20 inward from the upper half of FIG.

The conventional method of tightening the set screw and fixing the stopper to the measuring rod is extremely easy by hand, but not only is it troublesome to automate, but dozens of rebars are repeatedly struck against the stopper. If you do, you will preserve the drawback of gradually sliding.

If a chuck mechanism that bites the measuring rod 3 around the entire circumference as in the present invention is used, the control by the fluid pressure cylinder is easy and the movement of the stopper during use can be reduced to a negligible range. The ball chuck can be used so that the impulse of the stopper enhances the wedge action of the ball.

The restriction of the stopper by retracting the pressurizing end of the connecting fluid pressure cylinder 16 may be released after the stopper is fixed to the measuring rod 3 by the chuck mechanism 13 described above. It goes without saying that all fluid pressure cylinders are commanded by the control panel in the centralized control position.

Although one embodiment has been described above, it goes without saying that the present invention can be variously changed and applied within the scope of the gist thereof by a well-known technique of a mechanical designer.

<Effects of the Invention> The automatic length-cutting device of the present invention uses a combination of a servomotor, a screw shaft, and a moving female screw that can accurately set the moving distance for positioning the stopper, and automatically connects the connecting portion between the female screw and the stopper. Since it can be connected and disconnected, positioning of the stopper without deteriorating the measuring performance of the cutting machine,
The changes could be automated.

Adhesion and release of the measuring rod and stopper facilitated automatic control by adopting a fluid pressure operated chuck mechanism.

This not only solved the problems of labor, measuring accuracy, operation downtime, and other problems in performing preparatory work manually, but in the future, there will be many unmanned roads for continuous mass production of rebars of different lengths. Opened.

[Brief description of drawings]

FIG. 1 is an elevational view of an embodiment of the present invention, FIGS. 2 and 3 are longitudinal sectional views and side views of the chuck mechanism, and FIG. 4 is an enlarged plan sectional view of the same coupling device. Is a measuring rod, 4 is a movable shearing device, 10 is a stopper, 10a is a connecting projection, 15a is a horizontal guide rod, and 16 is a fluid pressure cylinder.

Claims (1)

[Claims] 1. A stopper is fixed to a required position of the measuring rod, and the tip of a straight member advanced along the measuring rod pushes the stationary measuring rod together with the stationary stopper forward to move the measuring rod of the measuring rod. In a scale-cutting device that automatically returns the measuring rod after cutting while traveling the straight member rearward by a movable shearing device that is fixed to the rear end and moves integrally with the rod, the stopper is advanced and retracted along the measuring rod. A setting device consisting of a servomotor driven fixed-position screw shaft and a moving female screw, a chuck mechanism attached to the above stopper for automatically fixing and releasing to the measuring rod, and moving the stopper only when positioning the stopper. An automatic measuring device for a straight material, characterized by comprising an automatic connecting device for connecting to a female screw.