JP2023047592A - Material feeding device and control method of the same - Google Patents

Abstract

To provide a material feeding device which enables improvement of followability to a press device when a feed roll is released, and to provide a control method of the material feeding device.SOLUTION: A material feeding device includes: a fixed frame 214; a lower feed roll 210 rotatably attached to the fixed frame 214; a movable frame 216; an upper feed roll 212 rotatably attached to the movable frame 216; an air spring 230 which compresses the movable frame 216 downward; an eccentric shaft 236 rotatably attached to the fixed frame 214; and a motor 240 which rotates the eccentric shaft 236. The movable frame 216 moves vertically in response to rotation of the eccentric shaft 236. The upper feed roll 212 contacts with the lower feed roll 210 or presses the lower feed roll 210 by the air spring 230 compressing the movable frame 216 downward and separates from the lower feed roll 210 or stop pressing the lower feed roll 210 in conjunction with the movable frame 216 by the eccentric shaft 236 rotating to push up the movable frame 216.SELECTED DRAWING: Figure 4

Description

The present invention relates to a material feeder and a control method for the material feeder.

2. Description of the Related Art Conventionally, there is a press apparatus that performs progressive press working (hereinafter referred to as progressive working). In progressive machining, one mold has a plurality of machining stages and performs a plurality of machining (a plurality of processes). A die of a press machine that performs progressive processing is provided with a pilot pin for positioning the die and a coil material (also referred to as a work). A scrap portion of the coil material is provided with a pin hole for fitting a pilot pin. The pilot pin is fitted into the pin hole while processing is being performed by the press device. Progressive press working is also called multi-step press working or Transfer Press Stamping.

A material feeding device for feeding a coil material to the pressing device is installed on the upstream side of the pressing device (see, for example, Patent Document 1). The material feeding device has a pair of upper and lower rotating bodies (hereinafter referred to as feed rolls), and the feed rolls feed a coil material of a predetermined feeding length to the press device before processing is performed by the press device. The feed rolls can be in a closed, abutting state and an open, spaced apart state. The feed rolls are open to allow free movement of the coiled material while it is being processed by the press. The feed roll changes from the closed state to the open state at the timing when the pilot pin is fitted into the pin hole. The change of the feed roll from the closed state to the open state is called release of the feed roll. On the other hand, the process of closing the feed rolls from the open state in order to convey the coil material to the pressing device is called pressurization of the feed rolls. Conventionally, an air cylinder is used for opening and closing the feed roll. Air cylinders are suitable for applying pressure due to their compressibility.

JP 2017-159325 A

However, since an air cylinder is used to open and close the feed rolls, there are the following problems. In the control of the opening/closing operation using an air cylinder, highly accurate speed control and position control are difficult, so there is a possibility that the release following the operation of the press device cannot be performed. If the operation of the air cylinder is accelerated as the rotation speed of the press increases, the feed roll frame collides with other parts when the feed roll is changed from the closed state to the open state, and the feed roll is changed from the open state to the closed state. Then, the feed roll collides with the coil material. As a result, there is a risk that collision noise will be generated, and that other parts and coil materials will be damaged. Furthermore, when the feed rolls are in the open state, the gap between the upper and lower rotors becomes larger than necessary, resulting in increased air consumption and a longer stroke until the feed rolls are closed again. For this reason, it is required to improve the release followability of the feed roll.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a material feeding device and a method of controlling the material feeding device, which are capable of improving followability to a press device when a feed roll is released. This is an exemplary task.

In order to solve the problems described above, the present invention has the following configurations.
(1) A material feeding device for feeding a coil material to a press device,
a fixed frame fixed to the material feeding device;
a first rotating body rotatably attached to the fixed frame;
a movable frame movable with respect to the fixed frame;
a second rotating body rotatably attached to the movable frame;
a pressure unit that presses the movable frame downward;
an eccentric shaft rotatably attached to the fixed frame;
a drive unit that rotates the eccentric shaft;
with
the movable frame moves up and down according to the rotation of the eccentric shaft;
When the movable frame is pressed downward by the pressing portion, the second rotating body contacts or presses the first rotating body, and the eccentric shaft rotates to rotate the movable frame. A material feeding device that separates from the first rotating body or does not press the first rotating body in conjunction with the movable frame when the frame is pushed up.

Further objects or other features of the present invention will be made clear by preferred embodiments described below with reference to the accompanying drawings.

Advantageous Effects of Invention According to the present invention, it is possible to provide a material feeding device and a method of controlling the material feeding device capable of improving followability to a press device when a feed roll is released.

FIG. 1 is a schematic front view showing the configuration of a press system according to an embodiment; FIG. 2 is a schematic perspective view showing the configuration of the press device of the embodiment; FIG. 3 is a schematic front view showing a pilot pin of the embodiment; FIG. 4 is a cross-sectional view showing (a) the configuration of the feeder of the embodiment, and (b) a cross-sectional view taken along line AA of (a). FIG. 5 is a schematic perspective view showing a main part of the feeder of the embodiment; FIG. 6 is a block diagram of the press system of the embodiment 7A and 7B are schematic diagrams of main parts showing the relationship between the eccentric shaft and the contact/separation between the upper feed roll and the lower feed roll according to the embodiment. (b) A diagram showing a case where the eccentric direction of the eccentric shaft is directly above

[Embodiment]
(press system)
FIG. 1 is a schematic front view showing the configuration of the press system of this embodiment. FIG. 1 also shows the conveying direction and the upstream, downstream and vertical directions. The press system of this embodiment includes an uncoiler 100 , a feeder 200 and a press device 300 . The uncoiler 100 and feeder 200 operate in conjunction with the processing operation of the press device 300 . A leveler, which is a correction device for correcting the curl of the coil material, may be arranged between the uncoiler 100 and the feeder 200, and furthermore, between the leveler and the feeder 200, the bending (loop) of the coil material may be corrected. A controlling loop table may be arranged.

(uncoiler)
The uncoiler 100, which is a holding device for holding the coil material, has a mandrel 110, a control section 130, and a driving section 140. As shown in FIG. The mandrel 110 holds a coiled material 120 that is an object to be processed by the pressing device 300 . For example, the inside diameter of the coiled material 120 is held by the mandrel 110 . The control unit 130 causes the driving unit 140 to rotate the mandrel 110 and unwind the coil material 120 so as to be interlocked with the processing operation by the press device 300 .

(Press device)
The press device 300 in FIG. 1 will be described with reference to FIG. FIG. 2 is a schematic perspective view showing the configuration of the press device 300 of the present embodiment, for example, a schematic view of the integrated straight side frame type or C frame type press device 300. As shown in FIG. Also, the press device 300 is, for example, a device that performs progressive press processing that performs a plurality of processing operations on a plurality of stages. FIG. 2 shows the conveying direction of the coil material 120, the upstream (left), the downstream (right) in the conveying direction, the vertical direction, and the front and rear directions (front and rear). The press device 300 includes a drive motor 304 , a transmission mechanism 306 , a crankshaft 308 , a connecting rod 310 , a slide 312 and a bolster 322 inside and outside a housing 302 . The press device 300 also has a controller 314 , a storage section 315 , a display section 316 and an input section 318 . Furthermore, the press device 300 has a sensor 324 , a rotary encoder 325 and a gib 326 . The press machine 300 of this embodiment is a progressive press machine that performs progressive press working (hereinafter referred to as progressive machining), and has a plurality of working stages. Progressive processing is also called transfer stamping, and the transfer press tool that constitutes it can be a single press die (upper and lower dies) by itself, or can be arranged in a continuous station. There can also be multiple press dies.

The drive motor 304 is, for example, a servo-controlled servomotor, and vertically moves the mold 303 to be described later via a transmission mechanism 306, a crankshaft 308, and a connecting rod 310 while controlling the amount and direction of rotation. The transmission mechanism 306 includes transmission members such as gears and belts, and transmits the rotation of the motor shaft of the drive motor 304 to the crankshaft 308 . Control signals to drive motor 304 are sent from controller 314 .

The crankshaft 308 and connecting rod 310 are for converting the rotational movement of the motor shaft transmitted by the transmission mechanism 306 into reciprocating movement (vertical movement in this embodiment). The rotation of the motor shaft causes the crankshaft 308 to rotate, and the rotation is transmitted to a connecting rod 310 having one end connected to the crankshaft 308 to move the connecting rod 310 up and down.

Further, the crankshaft 308 is provided with a rotary cam switch (not shown) that outputs an ON signal or an OFF signal in conjunction with the rotation of the crankshaft 308 . The rotary cam switch outputs an ON signal or an OFF signal when, for example, the rotation of the crankshaft 308 reaches a predetermined angle, in other words, when it reaches a predetermined timing during machining operation. The timing at which the rotary cam switch outputs the ON signal (or OFF signal) is hereinafter referred to as output timing. The controller 314 interlocks with the uncoiler 100 and the feeder 200 based on the signal output from the rotary cam switch to perform machining operations.

A slide 312 is connected near the other end of the connecting rod 310 . As the connecting rod 310 moves up and down, the slide 312 moves up and down along the gib 326 . A bolster 322 is arranged to face the slide 312 in the press device 300 . An upper mold 303 a as a part of the mold 303 is attached to the surface of the slide 312 facing the bolster 322 (lower surface in this embodiment). A lower mold 303b that forms a pair with an upper mold 303a is mounted as a part of the mold 303 on the surface (upper surface in this embodiment) of the bolster 322 facing the slide 312 .

The coil material 120 as an object to be processed is placed between the upper die 303a and the lower die 303b, and pressed by the upper die 303a and the lower die 303b. will be The coil material 120 is conveyed, for example, from the left (upstream) side to the right (downstream) side in FIG. In the press working having a plurality of steps, the processing in the early stage is performed from upstream in the conveying direction of the coil material 120 , and the processing in the final stage is performed in the downstream in the conveying direction of the coil material 120 .

Specifically, the drive motor 304 rotates under the control of the controller 314 . Rotation of the drive motor 304 is transmitted to the connecting rod 310 via the transmission mechanism 306 and the crankshaft 308, and the slide 312 moves up and down. As the slide 312 moves downward, the upper mold 303a and the lower mold 303b are pressed, and the coil material 120 is pressed. That is, in the press device 300, the drive motor 304, the transmission mechanism 306, the crankshaft 308, the connecting rod 310, and the slide 312 constitute a press section. The transmission mechanism 306 is provided with a rotary encoder 325 which is rotation speed detection means for detecting the rotation speed of the crankshaft 308 . The controller 314 can detect the position of the slide 312 by detecting the rotation speed of the crankshaft with the rotary encoder 325 .

The sensor 324, which is load detecting means for detecting the load during processing, is a sensor for detecting the load acting on the connecting rod 310 when the press device 300 presses the coil material 120, and is, for example, a load cell. Sensors 324 may be, for example, strain gauges mounted on housing 302 . Sensor 324 may be installed at any position on connecting rod 310 (for example, near the center). Furthermore, a plurality of sensors 324 may be installed. For example, the strain on the left and right sides of the housing 302 may be detected, and the detected results may be added to obtain the total load. 2, the side where the display unit 316 is arranged is the front side of the press device 300. As shown in FIG.

The controller 314 controls the press device 300 according to various programs stored in the storage section 315 . A display unit 316 displays data indicating the state of the press device 300 . The input section 318 is used to input data necessary for operating the press device 300 . The input unit 318 is used when the user inputs the length of conveying the coil material 120 (hereinafter referred to as the feeding length). The feed length is, for example, the length of the processing stage in the transport direction. The controller 314 controls so that the feeder 200 and the press device 300 work in conjunction with each other. In the press machine 300 that performs progressive processing, when the processing in one processing stage is completed, the controller 314 causes the feeder 200 to convey the coil material 120 to the next processing stage at a predetermined feed rate by a predetermined feed length. to control.

(Mold)
FIG. 3 is a schematic front view showing the configuration of a mold for performing progressive press working according to this embodiment. It is a schematic diagram explaining. FIG. 3 also shows a portion of the feeder 200 and the conveying direction, upstream, downstream and vertical directions. The press apparatus 300 of the present embodiment performs various multiple processes (multiple processes) such as coining, restrike, shaving, ironing, and drilling with one die 303 . A portion (range) of the mold 303 to be processed is called a processing stage. The mold 303 shown in FIG. 3 is provided with, for example, four processing stages St1, St2, St3, and St4 from the upstream side in the transport direction.

In the processing stage St1, a punch 350 is provided on the upper die 303a. A die 360 is provided at a position facing the punch 350 in the lower die 303b. The punch 350 and the die 360 punch a pilot hole 122 in a portion of the coil material 120 to be scrapped (hereinafter referred to as a scrap portion) when machining of the machining stage St1 is performed. The pilot hole 122 is a hole into which a pilot pin 352 for positioning the mold 303 and the coil material 120 during machining operation is fitted.

In the processing stages St2 to St4, pilot pins 352 are provided on the upper die 303a. A die 362 is provided at a position facing the pilot pin 352 on the lower die 303b. The pilot pin 352 is fitted into the pilot hole 122 formed in the coil material 120 when the machining stages St2 to St4 are processed, and positions the die 303 and the coil material 120 during the machining operation.

(feeder)
The feeder 200 is a material feeding device that feeds the coil material 120 held by the uncoiler 100 to the press device 300 . FIG. 4(a) is a cross-sectional view showing the configuration of the feeder 200 of this embodiment, and (b) is a cross-sectional view taken along the line AA of (a). FIG. 4A also shows the vertical direction and the front-rear direction (front and back), and FIG. 4B also shows the vertical direction and the horizontal direction (conveyance direction) (upstream and downstream). FIG. 5 is a schematic perspective view showing the essential parts of the feeder 200 of this embodiment, and also shows the vertical direction, the front-rear direction (front and back), and the left-right direction (conveyance direction).

Feeder 200 has lower feed roll 210 , upper feed roll 212 , fixed frame 214 , movable frame 216 , motor 218 , coupling 220 , cam follower 222 , eccentric cam follower 224 and center guide pin 226 . Feeder 200 has gear 228 , air spring 230 , precision regulator 232 , suspension spring 234 , eccentric shaft 236 , roller follower 237 , coupling 238 and motor 240 . The feeder 200 has a control section 250 and a storage section 260 . Note that the feeder 200 may have a display section and an input section.

The fixed frame 214 is a frame that is fixed to the feeder 200, and has a set of support portions 214a in the left-right direction (see FIG. 4B). FIG. 5 shows only the right support portion 214a of the pair of support portions 214a. The support portions 214a are arranged at both ends of the center guide pin 226, and support the center guide pin 226 in a vertically movable state.

The movable frame 216 can move vertically with respect to the fixed frame 214 . The movable frame 216 moves vertically according to the rotation angle of the eccentric shaft 236 . The movable frame 216 has support portions 216a and 216b, a plate portion 216c, a frame portion 216d, and spring contact portions 216e and 216f.

The support portion 216a, which is the first support portion, rotatably supports one end side of the upper feed roll 212, for example, the front side of the rotating shaft. The support portion 216b, which is the second support portion, rotatably supports the other end side of the upper feed roll 212, for example, the rear side of the rotating shaft. The plate-like portion 216c, which is a connecting portion, is a plate-like portion that connects the support portions 216a and 216b and extends substantially parallel to the longitudinal direction of the upper feed roll 212 (the front-rear direction in this embodiment). The frame portion 216d has a frame-like shape when viewed from the front, and is provided in plurality (for example, two in the present embodiment) in the front-rear direction. The frame portion 216 d surrounds the eccentric shaft 236 . The frame portion 216d is connected to the support portions 216a and 216b and the plate portion 216c.

The spring contact portion 216e is connected to the front frame portion 216d, and presses the front first air spring 230a (hereinafter simply referred to as the air spring 230a) from below when the eccentricity of the eccentric shaft 236 is right above. . The spring contact portion 216f is connected to the rear frame portion 216d, and when the eccentricity of the eccentric shaft 236 is directed upward, the rear second air spring 230b (hereinafter simply referred to as the air spring 230b) is activated. Press from below. A support portion 216 a of the movable frame 216 is sandwiched between a cam follower 222 and an eccentric cam follower 224 attached to the fixed frame 214 . The support portion 216b is similarly sandwiched between a cam follower (not shown) and an eccentric cam follower (not shown).

A rotation shaft of the lower feed roll 210 as a first rotating body is rotatably attached to a fixed frame 214 . The lower feed roll 210 is coupled to a motor 218 by a coupling 220 and is driven by the motor 218 to rotate. A gear 228 is provided at one end (for example, the front side) of the lower feed roll 210 and the upper feed roll 212 . Rotation of lower feed roll 210 is transmitted to upper feed roll 212 by gear 228 .

The upper feed roll 212, which is a second rotating body, has a rotation shaft rotatably attached to the support portions 216a and 216b of the movable frame 216, and moves up and down in conjunction with the vertical movement of the movable frame 216. FIG. That is, the upper feed roll 212 is in an open state separated from the lower feed roll 210 when the movable frame 216 is moved upward, and is in a closed state in contact with the lower feed roll 210 when the movable frame 216 is moved downward. The coil material 120 is sandwiched between the upper feed roll 212 and the lower feed roll 210 in a state where the upper feed roll 212 is in a closed state and is in contact with the lower feed roll 210, and is conveyed in the conveying direction. . Here, the contact means that the lower feed roll 210 does not necessarily contact the coil material 120, and the distance between the upper feed roll 212 and the lower feed roll 210 is equal to or less than the plate thickness of the coil material 120. The following distances are sufficient.

Cam follower 222 and eccentric cam follower 224 are attached to fixed frame 214 . In this embodiment, the eccentric cam follower 224 is arranged on the upstream side in the conveying direction, and the cam follower 222 is arranged on the downstream side. The eccentric cam follower 224 is provided to adjust the clearance or interference between the support portion 214 a (or the support portion 214 b ) and the cam follower 222 . The arrangement of the cam follower 222 and the eccentric cam follower 224 in the conveying direction may be reversed. Also, in this embodiment, two cam followers 222 and two eccentric cam followers 224 are provided in the vertical direction, but the number is not limited to two. The gap between the cam follower 222 and the support portion 216a (or 216b) of the movable frame 216 is appropriately adjusted, and the movement of the support portion 216a (or 216b) of the movable frame 216 in the left-right direction (conveyance direction) is restricted. , and guides during movement in the vertical direction.

The center guide pin 226, which is a guide shaft, penetrates the plate-like portion 216c of the movable frame 216 at a substantially central portion in the longitudinal direction. are doing. Both ends of the center guide pin 226 are supported by a pair of support portions 214a of the fixed frame 214 so as to be vertically movable. The presence of the center guide pin 226 restricts movement of the plate-like portion 216c in the front-rear direction. Note that the rotation of the center guide pin 226 around the center guide pin 226 is not restricted. Therefore, the plate-like portion 216c can tilt in the front-rear direction, and the upper feed roll 212 that moves in conjunction with the movable frame 216 can also tilt in the front-rear direction.

Air spring 230 , which is a pressure member, is provided above movable frame 216 . In this embodiment, for example, two air springs 230a and 230b are provided. The air spring 230a is provided on one end side (front side) in the front-rear direction, and the air spring 230b is provided on the other end side (rear side) in the front-rear direction. A precision regulator 232 adjusts the air pressure of the air spring 230 (hereinafter referred to as air pressure). A precision regulator 232a, which is the first adjusting means, adjusts the air pressure of the air spring 230a. A precision regulator 232b, which is a second adjusting means, adjusts the air pressure of the air spring 230b. The upper feed roll 212 comes into contact with the lower feed roll 210 as the movable frame 216 is pressed downward by the air spring 230 . The precision regulators 232a and 232b can independently adjust the air pressure of the air springs 230a and 230b, respectively, and can apply different pressurizing forces to the front side and the rear side of the upper feed roll 212. FIG. As described above, since the upper feed roll 212 is configured to be tiltable in the front-rear direction, it is possible to vary the force (hereinafter referred to as pressing force) pressing the lower feed roll 210 in the front-rear direction.

The suspension spring 234 lifts the upper feed roll 212 upward via the movable frame 216 by lifting the center guide pin 226 passing through the plate-like portion 216c of the movable frame 216 . Here, if the coil material 120 is, for example, a soft thin plate, even if the pressure applied to the upper feed roll 212 by the air spring 230 is set to 0, the coil material 120 may be rolled by the weight of the upper feed roll 212. . Therefore, the tension of the suspension spring 234 is adjusted to lift the weight of the upper feed roll 212 . Motor 218 is, for example, a servomotor, and rotates lower feed roll 210 .

The eccentric shaft 236 has a rotating shaft attached to the fixed frame 214 . The relationship between the rotation of the eccentric shaft 236 and the upper feed roll 212 will be explained with reference to FIG. The eccentric shaft 236 is coupled to a motor 240 by a coupling 238 and is driven by the motor 240 to rotate. The roller follower 237 has an annular shape and its inner diameter is fitted to the outer diameter of the eccentric shaft 236 . The roller follower 237a is fitted on the eccentric shaft 236 at one end side, for example, the front side of the eccentric shaft 236, and positioned below the air spring 230a. The roller follower 237b is fitted on the eccentric shaft 236 on the other end side of the eccentric shaft 236, for example, on the rear side, and positioned below the air spring 230b. The roller followers 237a, 237b are not in contact with the spring contact portions 216e, 216f of the movable frame 216 when the eccentricity of the eccentric shaft 236 is directly downward, and there is a gap (hereinafter referred to as initial gap) Si.

The motor 240, which is the drive unit, is, for example, a servomotor. A speed reducer 242 is provided between the coupling 238 and the motor 240 to reduce the rotational speed of the motor 240 and output the speed to the coupling 238 side.

The control unit 250 sends out the coil material 120 to the press device 300 by controlling the motors 218 and 240 in conjunction with the operation of the press device 300 . It is assumed that the control unit 250 controls the rotation of the lower feed roll 210 and the rotation of the eccentric shaft 236 by a known method using detection means such as an encoder.

The control unit 250 controls the feeder 200 while interlocking with the press device 300 according to various programs stored in the storage unit 260 . The storage unit 260 stores necessary information such as the feed length, which is the length of the coil material 120 required for one processing, and the feed speed, which is the speed at which the coil material 120 is conveyed. 250 conveys the coil material 120 according to the processing speed of the press device 300 .

(Block diagram of press system)
FIG. 6 is a block diagram of the press system of this embodiment. A controller 250 of the feeder 200 controls the motor 218 to rotate the lower feed roll 210 . The control unit 250 controls the motor 240 to rotate the eccentric shaft 236 to move the upper feed roll 212 up and down, thereby switching between the open state and the closed state. The control unit 250 adjusts the air pressure of the air spring 230a with the precision regulator 232a, and adjusts the air pressure of the air spring 230b with the precision regulator 232b. The storage unit 260 stores various information, programs, and the like necessary for the control unit 250 to control the feeder 200 .

A controller 314 of the press device 300 controls the drive motor 304 . The controller 314 is also connected to a display section 316 and an input section 318 . The controller 314 reads various parameters, various programs, and the like stored in the storage unit 315 in advance, and controls the processing operation of the press device 300 based on these. A rotary encoder 325 detects the rotation speed of an output shaft (not shown) of the drive motor 304 and outputs the detection result to the controller 314 . The controller 314 controls the drive motor 304 based on the detection results from the rotary encoder 325 . Further, the controller 314 detects a load generated during machining by a sensor 324 . The control unit 130 of the mandrel 110 rotates the mandrel 110 by the driving unit 140 to unwind the coil material 120 .

The control unit 130 of the mandrel 110, the control unit 250 of the feeder 200, and the controller 314 of the press device 300 can transmit and receive various types of information to each other by a known communication method, for example, via a communication port (not shown) possessed by each device. It is possible.

(Regarding pressurization and release in the feeder)
Pressurization and release in the feeder 200 of this embodiment will be described. 7A and 7B are schematic schematic diagrams showing the relationship between the eccentric shaft 236 of the embodiment and contact/separation between the upper feed roll 212 and the lower feed roll 210. FIG. FIG. 10B shows the case where the eccentric shaft 236 is eccentrically positioned directly above.

When the eccentric direction of the eccentric shaft 236 is straight downward as shown in FIG. and the coil material 120 and the lower feed roll 210 contact or press. (Feed roll pressure process).

On the other hand, the release of the upper feed roll 212, that is, the separation of the upper feed roll 212 from the coiled material 120 is performed by rotating the eccentric shaft 236 having a rotating shaft attached to the fixed frame 214, thereby pushing the movable frame 216 upward. The roll 212 is separated (separated) from the coil material 120 or the upper feed roll 212 is in a non-pressing state (not pressing state) to the coil material 120 . (Feed roll release process). The movable frame 216 is pushed up, and the spring contact portions 216e and 216f compress the air springs 230a and 230b. As a result, in the present embodiment, it is possible to reduce the amount of air consumed by the air spring 230 and realize energy saving.

The amount by which the upper feed roll 212 is pushed upward (hereinafter referred to as release amount) can be adjusted by controlling the rotation angle of the eccentric shaft 236 with a motor 240 coupled via a coupling 238 . be. Here, a state in which the eccentric direction of the eccentric shaft 236 faces directly downward as shown in FIG.

Assume that the initial gap Si (see FIG. 5) when the eccentric shaft 236 has an angle of 0 rad is 1.5 mm, for example. Also, the eccentric shaft 236 has an eccentric amount Ec, and the eccentric amount Ec is 3 mm, for example. Let θ (rad) be the angle when the eccentric shaft 236 rotates in a predetermined direction from an angle of 0 rad about the rotation center Ro (hereinafter referred to as the eccentric angle). At this time, the distance between the lower feed roll 210 and the upper feed roll 212 (hereinafter referred to as the gap Gp) is represented by the following formula (1).
Gap Gp=max[0,Ec×{1-cos θ}-Si]
=max[0,3×{1−cos θ}−1.5] Equation (1)
Here, max[x, y] means taking the larger value of x or y. For example, in the case of an angle θ (=π) in which the direction of eccentricity shown in FIG. 5B is directly upward, the gap Gp is 4.5 mm.

The control unit 250 rotates the eccentric shaft 236 by controlling the motor 240 and adds a predetermined margin to the plate thickness of the coil material 120 to control the gap Gp and perform the release operation. As for the value of the margin of the gap Gp, the operator may input a numerical value via the input unit. Further, the control unit 250 automatically sets the angle θ for realizing the gap Gp according to the result of judging the pressurization and release states of the coil material 120 based on the known torque of the motor 240 in advance. may In this way, the control unit 250 determines the pressure position (angle θ) and the release position (angle θ) of the coil material 120 by determining the torque of the motor 240, and automatically rotates the upper feed roll 212. The amount of movement in vertical movement can be minimized.

As described above, in this embodiment, the upper feed roll 212 is pressurized by the air spring 230 and released in conjunction with the eccentric shaft 236 rotated by the motor 240 pushing up the movable frame 216 . This improves the ability of the upper feed roll 212 to follow the pressing device 300 when released.

As described above, according to the present embodiment, it is possible to provide a material feeding device and a method of controlling the material feeding device that can improve followability to the press device when the feed roll is released.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these, and various modifications and changes are possible within the scope of the gist. includes.

- For example, the structure and control of this embodiment may be applied to a leveler feeder in which a leveler and a feeder are integrated.
・For example, the guide of the movable frame may be a groove instead of a cam follower.
- For example, the configuration for moving the movable frame up and down may be configured such that the motor is continuously rotated as a cam curve instead of an eccentric shaft.
・The movable frame may be guided by grooves in the front and back direction, and the structure may be simplified by applying the same pressure to the front and back.
- The motor 218 that rotates the lower feed roll 210 may be decelerated by a speed reducer.
・The precision regulator may be an electro-pneumatic regulator or may be automatically adjusted.
- A directional switching valve may be provided in the circuit of the air spring, and the valve may be closed after setting the pressurizing force.
- The pressurizing part is not limited to an air spring, and may be, for example, a single-acting cylinder. Also, the pressure source is not limited to air, and may be other gases or liquids.

(Purpose 1)
The material feeding device of the present invention is
A material feeding device for feeding a coil material to a press device,
a fixed frame fixed to the material feeding device;
a first rotating body rotatably attached to the fixed frame;
a movable frame movable with respect to the fixed frame;
a second rotating body rotatably attached to the movable frame;
a pressure unit that presses the movable frame downward;
an eccentric shaft rotatably attached to the fixed frame;
a drive unit that rotates the eccentric shaft;
with
the movable frame moves up and down according to the rotation of the eccentric shaft;
When the movable frame is pressed downward by the pressing portion, the second rotating body contacts or presses the first rotating body, and the eccentric shaft rotates to rotate the movable frame. When the frame is pushed up, it moves away from the first rotating body or does not press the first rotating body in conjunction with the movable frame.

(Purpose 2)
The drive unit may be a servomotor.

(Purpose 3)
The pressurizing part has a first air spring provided on one end side and a second air spring provided on the other end side in the longitudinal direction of the second rotating body,
a first adjusting means for adjusting the pressure of the first air spring;
a second adjusting means for adjusting the pressure of the second air spring;
may be provided.

(Purpose 4)
The movable frame includes a first support portion that supports one end side of the second rotor in the longitudinal direction, a second support portion that supports the other end side, and the first support portion along the longitudinal direction. a connecting portion that connects to the second supporting portion;
a guide shaft having both ends supported by the fixed frame and penetrating substantially in the center of the connecting portion in the longitudinal direction in a direction substantially parallel to the conveying direction of the coil material;
The second rotating body may be tilted in the longitudinal direction by tilting the movable frame about the guide shaft.

(Purpose 5)
The control method of the material feeding device of the present invention includes:
A control method for a material feeding device that feeds a coil material to a press device,
The material feeding device is
a fixed frame fixed to the material feeding device;
a first rotating body rotatably attached to the fixed frame;
a movable frame movable with respect to the fixed frame;
a second rotating body rotatably attached to the movable frame;
a pressure unit that presses the movable frame downward;
an eccentric shaft rotatably attached to the fixed frame;
a drive unit that rotates the eccentric shaft;
with
The movable frame moves up and down according to the rotation of the eccentric shaft,
a pressurizing step of pressurizing the movable frame downward by the pressurizing unit to bring the second rotating body into contact with or to press against the first rotating body;
a releasing step of separating the second rotating body from the first rotating body or not pressing the first rotating body in conjunction with the movable frame by rotating the eccentric shaft to push up the movable frame;
Prepare.

100 Uncoiler 110 Mandrel 120 Coil material 122 Pilot hole 130 Control part 140 Drive part 200 Feeder 210 Lower feed roll 212 Upper feed roll 214 Fixed frame 214a, 214b Support part 216 Movable frame 216a, 216b Support part 216c Plate-shaped part 216d Frame part 216e , 216f Spring contact portion 218 Motor 220 Coupling 222 Cam follower 224 Eccentric cam follower 226 Center guide pin 228 Gears 232, 232a, 232b Precision regulator 236 Eccentric shafts 237, 237a, 237b Roller follower 238 Coupling 240 Motor 242 Reduction gear 250 Control unit 260 Storage unit 300 Press device 302 Housing 303 Mold 303a Upper mold 303b Lower mold 304 Drive motor 306 Transmission mechanism 308 Crankshaft 310 Connecting rod 312 Slide 314 Controller 315 Storage unit 316 Display unit 318 Input unit 322 Bolster 324 Sensor 325 Rotary encoder 326 Gib 350 Punch 352 Pilot pins 360, 362 Die

Claims (5)

A material feeding device for feeding a coil material to a press device,
a fixed frame fixed to the material feeding device;
a first rotating body rotatably attached to the fixed frame;
a movable frame movable with respect to the fixed frame;
a second rotating body rotatably attached to the movable frame;
a pressure unit that presses the movable frame downward;
an eccentric shaft rotatably attached to the fixed frame;
a drive unit that rotates the eccentric shaft;
with
the movable frame moves up and down according to the rotation of the eccentric shaft;
When the movable frame is pressed downward by the pressing portion, the second rotating body contacts or presses the first rotating body, and the eccentric shaft rotates to rotate the movable frame. A material feeding device that separates from the first rotating body or does not press the first rotating body in conjunction with the movable frame when the frame is pushed up. The material feeding device according to claim 1, wherein the drive section is a servomotor. The pressurizing part has a first air spring provided on one end side and a second air spring provided on the other end side in the longitudinal direction of the second rotating body,
a first adjusting means for adjusting the pressure of the first air spring;
a second adjusting means for adjusting the pressure of the second air spring;
The material feeding device according to claim 1 or claim 2, comprising: The movable frame includes a first support portion that supports one end side of the second rotor in the longitudinal direction, a second support portion that supports the other end side, and the first support portion along the longitudinal direction. a connecting portion that connects to the second supporting portion;
a guide shaft having both ends supported by the fixed frame and penetrating substantially in the center of the connecting portion in the longitudinal direction in a direction substantially parallel to the conveying direction of the coil material;
4. The material feeding device according to claim 3, wherein said second rotating body can be tilted in said longitudinal direction by tilting said movable frame about said guide shaft. A control method for a material feeding device that feeds a coil material to a press device,
The material feeding device is
a fixed frame fixed to the material feeding device;
a first rotating body rotatably attached to the fixed frame;
a movable frame movable with respect to the fixed frame;
a second rotating body rotatably attached to the movable frame;
a pressure unit that presses the movable frame downward;
an eccentric shaft rotatably attached to the fixed frame;
a drive unit that rotates the eccentric shaft;
with
the movable frame moves up and down according to the rotation of the eccentric shaft;
a pressurizing step of pressurizing the movable frame downward by the pressurizing unit to bring the second rotating body into contact with or to press against the first rotating body;
a release step of rotating the eccentric shaft to push up the movable frame to separate the second rotating body from the first rotating body or not to press the first rotating body in conjunction with the movable frame;
A method of controlling a material feeder, comprising:

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