JPH023385Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a sizing cutting device that cuts a random length bar into n regular lengths.

[Technical background of the invention and its problems] Conventionally, a device for cutting irregularly sized bars into n fixed-sized pieces requires manual labor when feeding each bar, such as a bar, to a fixed-size cutting device one by one. This made the work cumbersome and reduced work efficiency, creating a demand for automatic cutting.

Furthermore, as an apparatus for positioning and cutting a workpiece material, for example, a technique disclosed in Japanese Patent Publication No. 16770/1983 is known. This allows the stopper to be moved in the direction of movement of the workpiece material, and before the stopper reaches a predetermined position, the workpiece device comes into contact with the stopper, so that both stop in the predetermined position. Therefore, when a workpiece approaches the stopper, this is detected, and from this state the stopper is moved in the same direction as the traveling direction of the workpiece material, and before the stopper reaches a predetermined position, the workpiece comes into contact with the stopper, It is numerically controlled so that both stop at a predetermined position. However, the device is complicated, and when cutting continuously fed bar materials to a fixed size, the detector detects the tip of the workpiece, especially the tip of the workpiece that is fed later. was cut off,
There is a problem that material loss occurs.

[Purpose of the invention] The present invention can automatically feed individual bars independently without interfering with each other, and can automatically cut irregular length items that are continuously fed to a fixed size.
It is an object of the present invention to provide a sizing cutting device for bar materials that can efficiently remove scraps.

[Summary of the invention] The sizing cutting device for bars of the present invention comprises: a pair of preliminary feed rollers that pinch and feed the bar; a first pair of main feed rollers that pinch and feed the fed bar; A second main feed roller pair is installed between the first and second main feed roller pairs to sandwich and feed the bar material fed by the first main feed roller pair, and is provided with a constant speed with respect to the bar material. A bar rear end position detector determines the total number of bars made by cutting to n pieces, and this detector moves the bar back a predetermined amount so that the (n-1) cut scraps can be discharged. , and a movable stopper that detects contact with the front end of the next bar to be sent and returns to the original position together with the bar; the first and second main feed roller pairs are set to have a larger feeding speed and a larger clamping force for the bar material than the preliminary feed roller pair. , and a retraction dimension of the movable stopper is set to be larger than a dimension of the scrap material.

[Embodiment of the invention] An embodiment of the invention will be described below with reference to FIG.

FIG. 1 is a plan view of this embodiment, and from the right to the left in the drawing, a first bar, for example, bar 1 ₂
shall be sent.

However, the feeding system for the bar 1 ₂ consists of a pair of preliminary feed rollers 10 ₁ , 10 ₂ and a pair of main feed rollers 11 ₁ , 1 .
1 ₂ , and a second main feed roller pair 12 ₁ and 12 ₂ , each pair of rollers are arranged at a predetermined distance apart. That is, the preliminary feed roller pair 10 ₁ ,
10 ₂ and the first main feed roller pair 11 ₁ , 11 ₂ are arranged at positions where they respectively sandwich both sides of the independent irregular length bar 1 . First main feed roller pair 11 ₁ ,
The distance between the rollers 11 ₂ and the second pair of main feed rollers 12 ₁ and 12 ₂ is set to be approximately the same as the distance between the pair of preliminary rollers and the second pair of main feed rollers described above.
Between the first pair of main feed rollers 11 ₁ , 11 ₂ and the second pair of main feed rollers 12 ₁ , 12 ₂ , for example in the middle, there is a rear end portion of the bar for detecting the rear end of the bar. A position detector 13 is provided. As the bar rear end position detector 13, for example, a known proximity switch is used as a non-contact detection sensor.

In addition, the relationship between the feeding speeds of the preliminary feed roller pair and the first and second main feed roller pairs is such that the speed of each main feed roller pair is high, and the speed of the first main feed roller pair and the second main feed roller pair is The feeding speed is set to the same speed. Furthermore, the first and second main feed roller pairs 11 ₁ ,
The bar clamping forces of the rollers 11 ₂ , 12 ₁ and 12 ₂ are set to be larger than the bar clamping forces of the preliminary feed roller pair 10 ₁ and 10 ₂ .

A bar cutting device is installed following the above-mentioned feeding system, and this cutting device is equipped with a fixed cutting die 15 ₁ , a movable cutting punch 15 ₂ , and a movable stopper 16 in order from the direction in which the bar enters. has been done.

However, in this cutting device, the cutting die 15 ₁
There is a bar insertion slot 15 ₃ for easy insertion of the bar 1 ₂ .
is formed into a cone shape. Also cutting punch 1
5 ₂ cuts the bar 1 ₂ while being in contact with the cutting die 15 ₁ , and a bar presser _{15 4 for} supporting the bar 1 in advance is disposed opposite to the cutting punch 15 2 . In addition, a pin 155 for holding down the bar ₁₂ prior to cutting the bar ₁₂ and a spring ₁₅₆ for _constantly applying elastic force to this pin are installed in the cutting punch ₁₅₂ . .

On the other hand, the bar presser 15 ₄ is constantly given a resilient force by a spring 15 ₇ which is weaker than the pressing force of the cutting punch 15 ₂ . The width Lo of the cutting punch 15 ₂ is set to the fixed size cutting dimension of the bar material, and the cutting die 15 ₁
A cutting portion is provided at the right end of the cutting punch 15 ₂ that is in contact with the cutting punch 15 2 . The left end of this cutting punch ₁₅₂ coincides with the bar contact position of the movable stopper 16 at its original position. Further, the distance between the position of the cutting part of the cutting punch ₁₅₂ and the detection position of the rear end of the bar is set to a position corresponding to n lengths of the regular cutting dimension.

Further, the movable stopper 16 has a mechanism (not shown) that can freely move forward and backward in the same direction as the traveling direction of the bar ₁₂ , and the front end of the bar is used to detect contact of the bar at the original position of the movable stopper 16. part position detector 14
It also serves as Further, the movement size of the movable stopper 16 is set to be larger than the size of the scrap after cutting the (n-1)th bar ₁₂ , which will be described later.

The device of this embodiment is configured as described above, and its operation will be explained below.

First, the first bar 1 ₂ is held between the preliminary feed roller pair 10 ₁ , 10 ₂ and then transferred to the first main feed roller pair 11 ₁ , 11 ₂ and the second main feed roller pair 12 ₁ , 12 ₂ . Cutting dies 15 ₁ are fed sequentially
It passes through the insertion opening 15 ₃ and between the cutting punch 15 ₂ and the bar presser 15 ₄ . When the bar 1 ₂ advances further, it is first detected from the rear end of the bar 1 ₂ by the bar rear end position detection 13, and it is determined that n pieces are to be cut. When the (n-1)th piece of cut material is sent, the movable stopper 16, which is set at the original position (the left end position of the cutting punch), is moved back by a signal.
Offcuts are discharged. The amount of retraction is set in advance to be larger than the size of the scrap after cutting the (n-1)th piece of the bar in order to discharge the end. Next, when the bar 1 ₁ runs, it comes into contact with the movable stopper 16 and comes to a stop, but this movable stopper 1
6 also serves as a front end position detector 14 of the bar ₁₂ . This detection signal causes the movable stopper 16 to return to its original position, and the cutting punch 15 ₂ approaches, making it possible to cut the continuously fed second bar to a fixed size. In addition, pin 15 built into the cutting punch
₅ presses the bar ₁₂ first, and together with the bar presser ₁₅₄ serves an auxiliary function by smoothing the cutting by the cutting punch ₁₅₂ . When the cutting is completed, the cutting punch ₁₅₂ retreats and the bar material cut to the specified size falls. During this time, each feed roller is stopped, but the second feed roller
Only the main feed roller pair 12 ₁ , 12 ₂ starts rotating and feeds the bar. Then, since the bar rear end position detector 13 is specifically set to off, the front end of the bar is not detected and the second main feed roller pair 1
2 ₁ , 12 ₂ , cutting dies 15 ₁ , 15 ₂ , and cutting punch 15 in order, and impinge on movable stopper 16 . At this time, the movable stopper 16 has returned to its original position, so cutting is repeated by the above-described operation. In addition, when feeding the bar material, the preliminary feed roller pair and the first
Although the speeds of the first pair of main feed rollers are different, the clamping force of the first pair of main feed rollers is superior (larger) than the clamping force of the first pair of pre-feed rollers, so the gap between the pair of pre-feed rollers and the bar material is will end up spinning idly.

Furthermore, by making the escape amount of the movable stopper 16 larger than the size of the scraps of the bar ₁₂ remaining after the n-1th cut, the scraps become free and fall reliably after the n-th cut.

As described above, the irregular length bars supplied one by one are automatically supplied and cut to size automatically without interfering with each other, and production efficiency is significantly improved compared to the conventional method.

[Effects of the Invention] As described above, the present invention can automatically cut irregular length bars into fixed sizes while continuously supplying them, resulting in a significant improvement in work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing a bar stock cutting device to size according to an embodiment of the present invention. 10 ₁ , 10 ₂ ...preliminary roller pair, 11 ₁ , 11 ₂
...First main feed roller pair, 12 ₁ , 12 ₂ ...Second main feed roller pair, 13... Bar rear end position detector, 14... Bar front end position detector, 15... …
Cutting device, 16... movable stopper.

Claims (1)

[Scope of utility model registration request] a pair of preliminary feed rollers that pinch and feed the bar;
a first pair of main feed rollers that pinch and feed the fed bar; a second pair of main feed rollers that pinch and feed the long material fed by the first pair of main feed rollers; a bar rear end position detector that is installed between the first and second main feed roller pairs and determines the total number of bars made by cutting the bar to a fixed size to be n; The machine moves back a predetermined amount so that the scraps after the n-1 cut can be discharged,
and a movable stopper that detects contact with the front end of the next bar to be sent and returns to the original position together with the bar, and a fixed cutting size n from the position of the bar rear end detector. a cutting device disposed at the main feed position, the first and second main feed roller pairs are set to have a larger feeding speed and a larger clamping force for the bar material than the preliminary feed roller pair; The apparatus for cutting a bar to a fixed size, characterized in that a retraction dimension of the movable stopper is set to be larger than a dimension of the offcut material.