JP2001138098A - Position detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position detector of a press brake which is small in size, versatile in selection of a fitting place, simple in structure, small in number of parts, and compact in arrangement. SOLUTION: An encoder 16 is fitted to a pulley 28 with a wire 17 wound therearound, a tip of the wire 17 and the pulley 28 with the wire 17 wound therearound are provided on a ram or a side plate 7, and the side plate 7 or the ram, respectively, the elevating/lowering motion of the ram is transmitted via the wire 17 and the pulley 28, and converted in the notational motion of the encoder 16, and the ram elevating/lowering position is detected via the encoder 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a position detecting device, and more particularly to a position detecting device applied to a press brake.

[0002]

2. Description of the Related Art Conventionally, in a press brake (FIG. 8), the raising / lowering position of a ram composed of an upper table 6 or a lower table 1 has been a problem.

[0003] That is, the press brake shown in FIG. 8 has a side plate 50, and an upper table 51 is provided above the side plate 50.
However, a lower table 53 is arranged at the lower part.

A punch 52 is provided on the upper table 51.
However, dies 54 are attached to the lower table 53, respectively.

With this configuration, the work W is placed on the die 54. For example, in the case of a lifting press brake, the lower table 53 is raised, so that the punch 52 and the die 54 cooperate on the work W. A predetermined bending process is performed.

In this case, the bending angle θ of the work W is determined by the raised position of the lower table 53, and the bending angle θ
Is smaller and sharper at a higher position of the lower table 53, and larger and duller at a lower position.

When the bending process is completed, the lower table 53 is lowered to stop at the original position when it reaches the lower limit position.

Therefore, it is necessary for the NC incorporated in the press brake (FIG. 8) to constantly monitor the elevation position of the lower table 53 and control the lower table 53 as described above.

For this reason, conventionally, a press brake has been provided with a position detecting device for detecting the elevation position of the lower table 53.

For example, in the press brake shown in FIG. 8, a pulse scale 55 is mounted on a side plate 50 via a mounting plate 61.

The head 5 of the pulse scale 55
6 is attached to the lower table 53 via a connecting member 57 and an attachment plate 58.

With this configuration, when the lower table 53 moves up and down, its position is detected by the pulse scale 55 via the head 56 and transmitted to the NC, and predetermined control is performed.

[0013]

[Problems to be solved by the invention]

However, the pulse scale 55 constituting the conventional position detecting device (FIG. 8) extends vertically in the vertical direction of the side plate 50.

Conventionally, a head 56 for reading the value of the pulse scale 55 is required, and a connecting member 57 and a mounting plate 58 for mounting the head 56 to the lower table 53 on the opposite side are required. It is.

For this reason, conventionally, the position detecting device has become extremely large.

[0017] In connection with the increase in size, the conventional position detecting device has a limited installation place.

For example, even if an attempt is made to attach to a small press brake, an appropriate portion cannot be found, and the installation may be difficult.

As a result, there is an adverse effect that the use of a small press brake is reduced.

Further, as described above, the conventional position detecting device (FIG. 8) uses a pulse scale 5 as a measurement scale.
5 and its reading part, such as a head 56,
Two parts are required.

Therefore, the structure of the conventional position detecting device is complicated by that much, and the number of parts is large and bulky.

An object of the present invention is to provide a position detecting device which is compact and has a simple structure, a small number of parts, and a compact arrangement in a press brake.

[0023]

In order to solve the above-mentioned problems, the present invention relates to a method of manufacturing a battery according to (A) side plate 7 as shown in FIGS.
The ram comprising one of the upper table 6 and the lower table 1 on which the punch 4 and the die 3 are mounted, which is disposed on the upper and lower sides, is raised and lowered, and the punch 4 and the die 3 cooperate to bend through the work W. Press brake,
(B) The encoder 1 is mounted on the pulley 28 around which the wire 17 is wound.
6 and attach the tip of the wire 17 to the ram or side plate 7,
A pulley 28 around which the wire 17 is wound is provided on the side plate 7 or the ram, respectively.
8, a rotational motion of the encoder 16 is converted into the rotational motion of the encoder 16, and the elevation position of the ram is detected via the encoder 16.

Therefore, according to the configuration of the present invention, the wire 1
7 and the encoder 16 is attached to the pulley 28 around which the wire 17 is wound, so that the entire size is reduced, so that it can be attached even to a small press brake or the like. Is provided.

Further, the wire 17, the pulley 28 and the encoder 16 are continuously and integrally formed, so that the ascending and descending movement of the ram is transmitted by the wire 17 and the pulley 28 and converted into the rotational movement of the encoder 16 so that the ram is rotated. , The structure is simplified, the number of parts is reduced, and a compact position detection device is provided.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings according to embodiments. FIG. 1 is an overall view showing an embodiment of the present invention.

As the press brake to which the present invention is applied, there is, for example, a lift press brake (lower view in FIG. 1). The lift press brake has a lower table 1 which is moved up and down by a cylinder 8. A die 3 is attached to the lower table 1.

The lift press brake shown in FIG.
Side plates 7 are provided on both sides thereof, and an upper table 6 is fixed to the side plates 7, and a punch 4 is attached to the upper table 6.

With this configuration, the press brake performs a predetermined bending process on the work W by cooperation of the punch 4 and the die 3.

The press brake shown in FIG.
The position detecting device shown in FIG.

In FIG. 2, a wire 17 is connected to a pulley 28
The encoder 16 is attached to the pulley 28 via one shaft 35.

A coil spring 29 is fitted between the pulley 28 and the encoder 16.

With this configuration, if the tip of the wire 17 is attached to a movable portion, for example, the lower table 1 and the pulley 28 is attached to a stationary portion, for example, the side plate 7, the pulley is connected via the wire 17 as the lower table 1 moves up and down. The rotation of the encoder 28 causes the encoder 16 attached to the pulley 28 to also rotate.

That is, the vertical movement of the lower table 1 is transmitted by the wire 17 and the pulley 28 and converted into the rotational movement of the encoder 16, and the vertical position of the lower table 1 is detected.

In addition, since the pulley 28 is urged by the coil spring 29, the wire 17 is always tensioned by the restoring force of the pulley 28, and the position of the lower table 1 ascending and descending can be detected more accurately.

Specifically, as shown in FIG. 3, for example, a pulley 28 having the encoder 16 mounted on the side plate 7 side is used.
Is attached to the lower table 1 side, respectively.

That is, the pulley 28 on which the encoder 16 is mounted is supported on the side plate 7 via the mounting plate 34, and the other shaft 36 of the pulley 28 is rotatably mounted on the side plate 7 by the bearing 33. ing.

The wire 1 wound on the pulley 28
Reference numeral 7 denotes an idler pulley 31, 3 attached to the side plate 7.
2 to the lower table 1 and the wire 17
Are attached to the lower table 1 by bolts 30 via spacers 38.

With this configuration, when the lower table 1 is raised (FIG. 4A), the wire 17 guided by the idler pulleys 31 and 32 resists the restoring force of the pulley 28 urged by the coil spring 29. Then, it is pulled upward.

Therefore, the pulley 28 rotates in a direction in which the wire 17 is released, for example, counterclockwise (FIG. 4A).

Accordingly, the encoder 16 attached to the pulley 28 also rotates in the same direction, and the ascending position of the lower table 1 is detected via the encoder 16.

When the lower table 1 is lowered (FIG. 4B), the wire 17 guided by the idler pulleys 31 and 32 is moved downward by the restoring force of the pulley 28 urged by the coil spring 29. Pulled.

Therefore, the pulley 28 rotates in the direction of rewinding the wire 17, for example, clockwise (FIG. 4B).

Accordingly, the encoder 16 attached to the pulley 28 also rotates in the same direction, and the lowered position of the lower table 1 is detected via the encoder 16.

In this case, the wire 17 is generally elongated (FIGS. 1 to 3), and the pulley 28 around which the wire 17 is wound and the encoder 16 attached to the pulley 28 are both formed in a cylindrical shape. Have been.

Therefore, as compared with the conventional position detecting device (FIG. 8), the position detecting device according to the present invention (FIGS. 1 to 3) has a small overall size. It is possible to attach to such a thing, and it doesn't matter where it is attached.

Further, as described above, the wire 17, the pulley 28, and the encoder 16 are continuously and integrally formed (FIGS. 1 to 3), so that the ram moves up and down (FIG. 4).
The encoder 16 is transmitted by the wire 17 and the pulley 28
The rotational position of the ram is converted into the rotational movement of the ram to detect the vertical position of the ram.

Therefore, as compared with the conventional position detecting device (FIG. 8), the position detecting device according to the present invention (FIGS. 1 and 2) has a simplified structure and a reduced number of parts.
It is compact.

FIG. 5 is a view showing another embodiment of the position detecting device according to the present invention. Unlike FIG. 1 to FIG. 4, a pulley 2 having the encoder 16 mounted on the lower table 1 side.
8, the tip of the wire 17 is attached to the side plate 7 side.

That is, the pulley 28 to which the encoder 16 is mounted is supported on the lower table 1 via the mounting plate 34, and the other shaft 36 of the pulley 28 is rotatable by the bearing 33 with respect to the lower table 1. Installed.

The wire 1 wound on the pulley 28
The wire 7 is guided by an idler pulley 39 attached to the lower table 1 and extends to the side plate 7, and the tip of the wire 17 is attached to the side plate 7 by a bolt 30 via a spacer 38.

With this configuration, when the lower table 1 is raised (FIG. 6A), the wire 17 guided by the idler pulley 39 is pulled by the pulley 28 urged by the coil spring 7.
Is pulled down against the restoring force of

For this reason, the pulley 28 rotates in the direction in which the wire 17 is released, for example, counterclockwise (FIG. 6A).

Accordingly, the encoder 16 attached to the pulley 28 also rotates in the same direction, and the raised position of the lower table 1 is detected via the encoder 16.

When the lower table 1 is lowered (FIG. 6B), the wire 17 guided by the idler pulleys 31 and 32 is moved upward by the restoring force of the pulley 28 urged by the coil spring 7. Pulled.

Therefore, the pulley 28 rotates in the direction of rewinding the wire 17, for example, clockwise (FIG. 6B).

Therefore, the encoder 16 attached to the pulley 28 also rotates in the same direction, and the lowered position of the lower table 1 is detected via the encoder 16.

On the other hand, a follow-up device 11 is provided in front of the press brake shown in FIG.

The follower 11 (FIG. 1) moves the workpiece W on the basis of the elevation position detected via the encoder 16.
Is a device that supports the work W following the bending process, and has the effect that the worker does not need to support the work W being bent and is released from heavy labor.

The follower 11 moves in the front-rear direction (Y-axis direction) along the rail 20, and the wheels 19 on the rail 20 are connected to the motor M via the timing belt 37. I have.

The tracking device 11 has a main body 15 movable in the vertical direction (Z-axis direction). One end of a pantograph 12 is connected to the main body 15,
Is connected to the follow-up table 14.

With this configuration, the follow-up device 11 carries the work W sucked and fixed onto the follow-up table 14 via an electromagnetic holder or the like (not shown) into the press brake,
The work W is supported by controlling the operation of the main body 15 and the pantograph 12 following the bending process of the work W based on the elevating position detected via the encoder 16.

The abutment 13 is attached to the lower table 1 via the support 10 and abuts and positions the work W carried in by the follower 11.

The press brake (FIG. 1) has a control box 9, in which an NC 27 is built.

The NC 27 includes the CPU 21 and the encoder 1
6, operation unit 22, display unit 23, table control unit 2
4, a tracking control unit 25, and a storage unit 26.

The CPU 21 controls the entire apparatus shown in FIG. 1, such as performing a control operation of the position detecting apparatus according to the present invention based on a program (corresponding to, for example, FIG. 7) stored in the storage section 26. .

The encoder 16 detects the elevation position of the lower table 1 as described above, and compares the current value with the CP.
Send to U21.

The operation section 22 is composed of a keyboard, a mouse, and the like, and sets, for example, a target value of the lower table 1 (step 101 in FIG. 7).

The display section 23 is composed of a CRT, a liquid crystal or the like, and displays a processing operation according to the present invention (FIG. 7), for example.

The table control unit 24 and the follow-up control unit 25
In accordance with an instruction from the CPU 21, the operation of raising and lowering the lower table 1 and the operation of the following device 11 are controlled.

The storage unit 26 is composed of a ROM or a RAM, and the ROM stores the above-described program.
In M, data necessary for bending, such as a target value of the lower table 1 input from the operation unit 22 and a preset lower limit of the lower table 1, are stored.

Hereinafter, the operation of the present invention having the above configuration will be described.
A description will be given based on FIG.

In this case, the work W (FIG. 1) is previously attracted and fixed on the follow-up table 14 of the follow-up device 11, and the motor M is operated to move the follow-up device 11 forward along the rail 20. Then, the tip of the work W is abutted against the abutment 13 via the die 3 to perform positioning.

(1) Operation up to the end of bending (steps 101 to 106 in FIG. 7). In step 101 of FIG. 7, a target value is set. In step 102, it is determined whether or not the start switch is turned on. If the start switch is not turned on (NO), the same operation is repeated, and if it is turned on (YES). In step 103, the lower table 1 and the follower 11 are raised, and bending is started.

That is, when the operator inputs and sets the target value of the lower table 1 via the operation unit 22 (FIG. 1), and when the operator presses a start switch constituting the operation unit 22, it is turned on. The CPU 21 that has detected that the lower table 1 and the following device 11 are lifted via the table controller 24 and the following controller 25.

As a result, the work W placed on the die 3 of the lower table 1 and supported by the follower table 14 of the follower 11 is bent by the punch 4 of the upper table 6 and the die 3 of the lower table 1. Is applied.

Next, in step 104 of FIG.
The position is detected by the encoder 16, and it is determined in step 105 whether or not the target value is reached. If not, the process returns to step 103 and the same operation is repeated.
In the case of the target value (YES), in step 106, the lower table 1 and the following device 11 are stopped, and the bending is completed.

That is, when the lower table 1 is raised (FIG. 4)
(A)), as described above, the idler pulleys 31, 32
Is pulled upward against the restoring force of the pulley 28 urged by the coil spring 29.

Since the pulley 28 rotates in a direction in which the wire 17 is released, for example, in a counterclockwise direction (FIG. 4A), the encoder 16 attached to the pulley 28 also rotates in the same direction.

Then, the encoder 16 detects the rotational position as the ascending position of the lower table 1, and transmits it to the CPU 21 (FIG. 1) as a position detection signal.

At this time, the CPU 21 (FIG. 1) receives the position detection signal from the encoder 16 and compares it with the target value. Lower table 1 via control unit 25
And the follow-up device 11 is raised.

However, when the CPU 21 determines that the position detection signal from the encoder 16 has reached the target value, the CPU 21 stops the lower table 1 and the follower 11 via the table controller 24 and the follower controller 25. .

Thus, the work W is bent at a predetermined angle θ.

(2) Operation after completion of bending (steps 107 to 111 in FIG. 4).

Next, in step 107 of FIG. 7, the lower table 1 is lowered, and in step 108, the position is detected by the encoder 16. In step 109, it is determined whether or not the lower limit is reached. Returns to (NO) step 107 and repeats the same operation.
In the case of the lower limit value (YES), the lower table 1 is stopped in step 110, the follow-up device 11 is retracted in step 111, and all operations are ended (END).

That is, when the lower table 1 is lowered (FIG. 4B), the idler pulleys 31, 3
The wire 17 guided to 2 is pulled downward by the restoring force of the pulley 28 urged by the coil spring 29.

Therefore, the pulley 28 rotates in the direction of rewinding the wire 17, for example, clockwise (FIG. 4B).

Then, the encoder 16 detects the rotational position as the lowering position of the lower table 1 and transmits it to the CPU 21 (FIG. 1) as a position detection signal.

At this time, the CPU 21 (FIG. 1) receives the position detection signal from the encoder 16 and compares it with the lower limit value. To lower the lower table 1.

However, if the CPU 21 determines that the position detection signal from the encoder 16 has reached the lower limit, the CPU 21 stops the lower table 1 via the table controller 24.

At this time, the work W that has been bent is, as shown in FIG.
The workpiece W is sucked and fixed, and the flange portion of the work W remains in contact with the punch 4 of the upper table 6, and only the lower table 1 reaches the lowermost position and stops.

Accordingly, the CPU 21 controls the following device 11 via the following control unit 25 to operate the main body 15 and the pantograph 12 so that the flange portion of the work W does not interfere with the punch 4 of the upper table 6. At the same time, the motor M is operated to retract the following device 11 backward.

In the above embodiment, the case where the present invention is applied to a lift press brake has been described in detail. However, the present invention is not limited to this, and the lower table is fixed and the upper table moves up and down. It is needless to say that the present invention is also applied to a descending type press brake which has the same effect.

[0094]

As described above, according to the present invention, according to the present invention, the encoder is mounted on the pulley around which the wire is wound, the tip of the wire is wound on the ram or side plate, and the wire is wound on the side plate or ram. Pulleys are provided, respectively, and the up-and-down movement of the ram is transmitted by a wire and a pulley, converted into a rotational movement of an encoder, and the up-and-down position of the ram is detected via the encoder.

Therefore, according to the configuration of the present invention, the whole is reduced in size by using a wire and attaching the encoder to the pulley around which the wire is wound. The wire, pulley, and encoder are continuously integrated with each other, so that the lifting and lowering movement of the ram is transmitted by the wire and pulley to the rotation of the encoder. Conversion detects the ram up and down position, simplifying the structure and reducing the number of parts.
There is an effect that a position detection device compactly provided is provided.

[0096]

[Brief description of the drawings]

FIG. 1 is an overall view showing an embodiment of the present invention.

FIG. 2 is a detailed view of the present invention.

FIG. 3 is a diagram showing a first embodiment of the present invention.

FIG. 4 is an operation explanatory view of FIG. 3;

FIG. 5 is a diagram showing a second embodiment of the present invention.

FIG. 6 is an operation explanatory view of FIG. 5;

FIG. 7 is a flowchart for explaining the operation of the present invention.

FIG. 8 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower table 3 Die 4 Punch 6 Upper table 7 Side plate 8 Vertical cylinder 9 Control box 10 Support 11 Following device 12 Pantograph 13 Plunge 14 Following table 15 Main body 16 Encoder 17 Wire 18 Hinge pin 19 Wheel 20 Rail 21 CPU 22 Operating part 23 Display Unit 24 table control unit 25 follow-up control unit 26 storage unit 27 NC 28 pulley 29 coil spring 30 bolt 31, 32, 39 idler pulley 33 bearing 34 mounting plate 35, 36 shaft of pulley 28 37 timing belt 38 spacer

Claims (6)

[Claims] 1. A ram comprising one of an upper table and a lower table provided with a punch and a die, which is disposed on an upper part and a lower part of a side plate, is moved up and down, and the punch and the die cooperate to perform a bending process through a work. In the press brake to be applied, an encoder is attached to the pulley around which the wire is wound, the tip of the wire is provided on the ram or the side plate, and the pulley around which the wire is wound is provided on the side plate or the ram. A position detecting device for transmitting the rotation, converting the rotation to the rotation of an encoder, and detecting the ascending / descending position of the ram via the encoder. 2. The position detecting device according to claim 1, wherein a coil spring is inserted between said pulley and said encoder. 3. The position detecting device according to claim 1, wherein said ram is constituted by a lower table, and detects a vertical position of the lower table via an encoder. 4. The position detecting device according to claim 3, wherein a tip of the wire is attached to the lower table, a pulley is attached to the side plate, and the wire is guided by an idler pulley attached to the side plate. 5. The position detecting device according to claim 3, wherein a tip of the wire is attached to a side plate, a pulley is attached to a lower table, and the wire is guided by an idler pulley attached to the lower table. 6. A bending device according to claim 1, wherein a follower installed in front of the press brake supports the workpiece by following a bending process of the workpiece based on the vertical position of the ram detected via the encoder. Processing equipment.