JPS6350047Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a material return prevention device that can reliably and easily prevent the material from returning to the supply section when the material feeding device in a press line or the like stops operating. It is.

A so-called press processing line, in which a strip-shaped material is fed from a supply section to a press machine or the like and subjected to press processing, is generally configured as shown in FIG.

Here, 1 indicates a material supply section in which a band-shaped press material 2 is wound into a coil shape, and the material 2 unwound in this supply section 1 is
Appropriate distance (L) from supply section 1 to prevent bending, etc.
In other words, in general, a roll feed or a gripper feed (the embodiment shown in the drawings shows an example of a gripper feed) is passed through the introduction roller 3 at an interval (L) of about 2000 to 3000 times the material plate thickness. It is supplied to a feeding device 4 such as.

The feed device 4 operates to automatically feed a predetermined amount of material 2 to the processing position of the press 5 in accordance with the operation timing of the press 5.

By the way, in this type of press working line, the material 2 supplied to the feeding device 4 is controlled by the material, thickness, width, and maximum curvature point P of the material 2.
It receives a return force in the direction A in the drawing corresponding to the length from the guide roller 3 to the introduction roller 3, that is, a so-called back tension.

Therefore, in the feeding device 4, when inserting the material, positioning it in the mold, and stopping the operation such as when the air source of the feeding device 4 is turned off, in order to prevent the material 2 from returning to the supply section 1 side. In this case, it becomes necessary to press and hold the material 2 in the feeding device with a force that overcomes the back tension. For example, in a gripper feed, a power source such as pneumatic pressure or hydraulic pressure is activated to bring the gripper portion of the material into operation. A method is adopted in which the material 2 is kept in place and prevented from returning.

However, it is uneconomical to keep the power source in operation when the feeding device 4 is stopped, as it wastes energy.

In contrast, as a conventional mechanism for preventing the return of the material 2, a mechanism using a one-way roller using a one-way clutch 8 as shown in FIGS. 2a and 2b, for example, has been implemented in some cases.

That is, on the material introduction side of the feed device 4 into which the material 2 is introduced by the introduction roller 3, one-way clutches 8 that rotate only in one direction are provided at both ends, and the upper and lower clutches are supported rotatably only in the direction in which the material 2 is fed. A pair of one-way rollers 7a, 7b is provided to guide the transfer of the material 2 within the feeding device 4 with the material 2 being sandwiched between the pair of one-way rollers 7a, 7b.

Therefore, the one-way rollers 7a and 7b can rotate only in the directions C and D shown in the figure, respectively.
Rotation in the opposite direction is stopped by a one-way clutch 8.

Therefore, the material 2 is transferred only in the direction B shown in the figure,
Returning in the opposite direction due to back tension, ie, in the direction A shown in the figure, is prevented.

However, in this return prevention device using the one-way rollers 7a and 7b, in order to obtain the frictional force necessary to prevent the material 2 from returning, the one-way roller
It is necessary to apply pressure to the rollers a and 7b from above and below, and the pressure is applied from both ends of the roller using a spring. If the feeding device 4 is operated in this pressurized state, there is a problem in that the load on the feeding device 4 side increases.

In addition, since the upper roll 7a always presses the material 2 against the lower roll with a spring, if the spring is not in an appropriate pressurized state, it may cause deformation or scratches on soft materials or easily scratched materials. The points were also hot.

Furthermore, if the width of the one-way rollers 7a, 7b becomes wider, it is necessary to make rollers with a larger diameter so that the rollers themselves do not bend, which increases the weight of the rollers. When such a large roller is rotated, there are problems such as the material 2 being fed into the feeding device 4 in an amount larger than the required amount due to the inertia of the roller, causing slack in the material 2. In order to eliminate these problems, For example, as shown in the figure, using a lever mechanism 9, when the feeding device 4 is operated, the lever mechanism 9 is operated to release the one-way roller 7a upward, and the distance between the two rollers 7a and 7b is as shown by the dashed line in the figure. It is also conceivable to open the switch to the open state, but in this case, the mechanism would be complicated.

Furthermore, since the one-way clutch 8 itself is expensive, there is also a cost problem.

Further, the wide rollers described above have difficulty achieving parallelism and other processing precision, and the manufacturing method is also difficult and not easy.

Further, it is difficult to balance the left and right springs that press the one-way roller 7a, and the adjustment takes time.

The present invention was developed in view of the above-mentioned circumstances. Generally, when pressed material advances toward the press machine, it advances smoothly without any force being applied to the pressed material, and only when the material backs up in the return direction does it move forward. It is an object of the present invention to provide a material return prevention device which is simple in structure and inexpensive in cost and can prevent the material from returning by applying a pressing force to the material.

The gist of the present invention is to include a base section that is attached to a predetermined position of a feeding device, etc. and has a material transfer surface on its upper surface, and a slide section that is arranged to be movable and adjustable in the vertical direction relative to the base section. a stop pawl rotatably disposed on a fixed shaft protruding from the slide portion and having a contact portion at its tip; and a guide roller rotatably disposed before and after the stop pawl; The contact part of the claw is located forward in the feed direction from just below the axis of the fixed shaft, and a bias force is applied in the opposite direction to the material feed direction so that the contact part constantly contacts the material and the material is moved in the opposite direction to the feed direction. When the material is about to be moved, the stop claw rotates and clamps the material with the material transfer surface.

Hereinafter, the material return prevention device according to the present invention will be described with reference to an embodiment shown in the drawings.

FIG. 3 is a front view of an embodiment of the present invention;
FIG. 4 is a plan view of the same embodiment.

10 is a code indicating the entire material return prevention position for preventing material return according to the present invention, and 11
is the base of the anti-return device. This base part 1
1 is penetrated by a female threaded portion 13 which is threadedly engaged with a feed screw portion 12 provided on the side plate 4a of the feeding device 4. Further, the guide rod 14 fixed to the side plate 4a of the feeding device 4 is loosely fitted into a guide hole 15 bored through the base portion 11. Therefore, the handle 1 disposed at the end of the feed screw portion 12
By rotating 2a, the base portion 11 can be moved in the direction of the feed screw. Further, on the upper surface of the base portion 11, a lateral guide roller 6 is rotatably disposed. A longitudinally continuous upper surface of the base section 11 including the front part of the lateral guide roller 6 is formed as a material transfer surface 11a,
Material 2 moves. A slide section 16 is disposed on the upper surface of the base section 11 other than the material transfer surface 11a so as to be movable in the vertical direction. In the moving mechanism, a through hole is bored inside the slide portion 16 at approximately the center thereof, and a guide post 17 is provided through the through hole. The bottom of the guide post 17 is provided with a male threaded portion 17a, and the base portion 11 is provided with a male screw portion 17a.
It is screwed into the female threaded hole. Further, a spring fitting hole is bored in the bottom of the slide part 16, and a pair of springs 16a are provided in the hole.
6 is urged upward from the bottom surface. Also, the upper end of the guide post 17 is provided with a male thread, and the nut 1
7b are screwed together to press and fix the slide portion 16. The adjusting nut 17b is then rotated in the loosening direction, and the nut 17b is moved upward. Thus, it becomes possible to move the slide portion 16 upward. Furthermore, by rotating the nut 17b in the tightening direction, the slide portion 16 can also be moved downward. A shaft 18b is protruded from approximately the center of the front surface of the slide portion 16, and a stop pawl 18 is rotatably fixed to this shaft 18b. The stop claw 18 has a through hole formed from the center to the upper end, and is rotatably provided on the slide portion 16 by the shaft 18b. Further, a contact portion 18a is formed at the lower end of the stop claw 18 at a location extending from below the shaft 18b in the direction of movement of the material. The contact portion 18a has a rounded shape so as not to damage the material, and may have several chevron shapes so that multiple portions contact each other.Furthermore, the length from the shaft 18b to the contact portion 18a is shorter than the shaft 18b. Since the length is approximately equal to or slightly longer than the length to the vertically downward material transfer surface, when the material 2 is placed on the material transfer surface 11a, the contact portion 18a of the stop claw 18 is directly below the shaft 18b. It is arranged so as to be located on the material that has advanced further in the direction of travel of the material. To explain one example as a specific shape, as shown in FIG. 3, a rectangular cam is shaped like a trapezoid by cutting off one corner, and the long side of the trapezoid is placed on the side in the direction of movement of the material 2. Arrange. Shaft 18b
is the short side of the trapezoid slightly from the center, that is, the material 2
It is also possible to improve the stopping effect by arranging it eccentrically on the insertion side.

Furthermore, a shaft 18b that rotatably supports the stop pawl 18
The weaker spring 19 is located higher up and on the short side of the stop pawl.
is provided to urge the stop pawl 18. Therefore, the stop claw 18 always lightly presses the material 2 in the return direction, so the material 2 is always pushed back.
It acts to make contact with the top. Moreover, the position of the spring 19 and the type of spring are different from the stop claw 1.
8 is always urged in the direction in which the material 2 returns.

Further, guide rollers 20 and 21 are provided before and after the stop pawl 18. The positions of the guide rollers 20 and 21 in contact with the material 2 are arranged at the same height as the contact position 18a of the stop pawl 18.

Further, an eccentric cam 22 is disposed at the upper part of the long side of the stop pawl 18 so as to be freely rotatable in conjunction with a lever 23. The shape of the eccentric cam 22 is similar to that of the lever 23.
When the handle 23a is moved in the material advancing direction, the stop claw 18 is moved as shown by the dashed line.
It is formed eccentrically so as to move away from the material 2.

Since the material returning device 10 of the present invention is constructed as described above, when it is attached to the feeding device 4, the device is moved by the handle 12a so that the lateral guide roller 6 is in contact with the edge of the material 2. move it.

Therefore, the material 2 can be moved on the material transfer surface 11a of the device 10 by the lateral guide rollers 6, passes under the longitudinal guide rollers 20, and passes under the stop pawl 18. Then, it passes under another guide roller 21 in the vertical direction and enters the feeding device 4. At this time, two guide rollers 20 and 21 in the vertical direction are arranged before and after the stop pawl 18, so that the stop pawl 18 is not pressed.
Since it rotates and keeps the position of material 2 constant, material 2
is substantially flat under the stop pawl 18. Therefore, the stop pawl 18 and the material 2 are always in contact without rotating much.

However, in the direction of movement, the stop pawl 18
will rotate freely. Therefore, when the material 2 moves in the advancing direction, it is possible to move the material 2 without applying any force.

In addition, when the material 2 is subjected to back tension for some reason and tries to return in the opposite direction to the traveling direction, the spring 19 also acts and the stop that was in contact with the upper surface of the material 2 is The pawl 18 also tries to rotate in the direction in which the material 2 returns, but the length from the shaft 18b to the contact portion 18a is longer than the length from the shaft 18b that fixes the stop pawl 18 to the material surface directly below it, so the length from the shaft 18b to the contact portion 18a is longer. No further progress is made and the force in the return direction of the stop claw 18 acts downward and presses the material 2 from above. Therefore, the stronger the return force of the material 2, the greater the force with which the stop claw 18 presses the material 2 downward, making it possible to prevent the material 2 from moving in the return direction.

Also, in order to prevent the stop pawl 18 of the device 10 from acting, the handle 23a of the lever 23 must be
By rotating the eccentric cam 22 in the direction of movement of the material 2, the eccentric cam 22 rotates the stop claw 18 to the position indicated by the dashed line. It no longer has the effect of causing

By the way, the material return prevention device 10 described above is
Generally, it is possible to prevent the material from returning by attaching it to one of the guide parts of the feed device 4 that guides the material 2 from the width direction, but when applying it to heavy materials, the above-mentioned Two material return prevention devices 10 may be provided on both sides of the width.

Furthermore, the mounting position of the return prevention device 10 on the feeding device 4 is not limited to the guide portion, but may be any position that does not interfere with the transfer of the material 2 and can hold the material 2 while the feeding device 4 is in operation. good.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with various modifications without changing the gist thereof.

As described above, the material return prevention device according to the present invention includes a slide portion that is adjustable in the vertical direction on the base portion that forms the material transfer surface, and a rotatable stop on the slide portion. A stop pawl is provided, and the contact part of this stop pawl is located forward in the feeding direction from just below the axis of the fixed shaft, and a biasing force is applied in the opposite direction to the material feeding direction so that the contact part always comes into contact with the material. When the material is about to move in the opposite direction to the feeding direction, the stop pawl rotates and clamps the material with the material transfer surface.

Therefore, the material return prevention device according to the present invention has the feature that the material return prevention mechanism can be configured extremely simply and at low cost, and does not require a separate power source such as hydraulic pressure or pneumatic pressure. This eliminates unnecessary energy consumption from the operation of the feeding device, etc. Furthermore, since no unnecessary pressure is applied to the material when transferring the material, there is no burden on the feeding device, and the energy of the feeding device is also reduced. It has the effect of reducing

In addition, when the material returns without any operation, the return prevention mechanism automatically operates to stop the material from returning, which is very effective.

Furthermore, in the material return prevention device according to the present invention,
Since the sliding part can be adjusted according to the thickness of the material, it is possible to always securely clamp the material in the specified position for various materials, and to ensure work to prevent backlash, improving work efficiency such as press work. The effects that can be obtained from improving this are extremely large.

[Brief explanation of drawings]

Figure 1 is a diagram for explaining the press line,
2a and 2b are schematic configuration diagrams showing an example of a conventional material return prevention device such as a feeding device, FIG. 3 is a front view showing an embodiment of the material return prevention device according to the present invention, and FIG. The figure is a plan view of the same embodiment. 4... Feeding device, 11... Base portion, 11a...
Material transfer surface, 16...Slide portion, 18...Stop claw, 18b...Fixed shaft, 20, 21...Guide roller.

Claims (1)

[Scope of utility model registration request] a base section that is attached to a predetermined position of a feeding device or the like and has a material transfer surface on its upper surface; a slide section that is arranged to be movable and adjustable in the vertical direction with respect to the base section;
A stop pawl is rotatably disposed on a fixed shaft protruding from the slide portion and has a contact portion at its tip, and a guide roller is rotatably disposed before and after the stop pawl. The contact part is located forward in the feed direction from just below the axis of the fixed shaft, and a bias force is applied in the opposite direction to the material feed direction so that the contact part constantly contacts the material and the material is moved in the opposite direction to the feed direction. A material return prevention device characterized in that when the material is about to be moved, the stop claw rotates and clamps the material with the material transfer surface.