JPS6234899Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stopper device that stops an object conveyed by a conveyor by hitting a leading stopper and prevents the object from bouncing back when stopped. It is something.

When positioning is performed by stopping a conveyed object conveyed by a roller conveyor or the like against a stopper, the stopped position of the conveyed object may vary due to bouncing of the conveyed object.
This results in insufficient stopping accuracy. especially,
This tendency is stronger when the weight of the transported object is large or when the transport speed is high. Conventionally, in order to improve the stopping accuracy, a backstopper (hereinafter, the stopper is referred to as a leading stopper in contrast to the backstopper) is provided together with a stopper for stopping the conveyed object. As the backstop, a tilting method in which the backstop is operated by the weight of the backstop main body as shown in FIG. 1, and a vertically movable method in which the backstop is operated by the force of a tension spring as shown in FIG. 2 have been adopted. In the tilting method, a backstop main body 10 is rotatably supported at a position away from its center of gravity, and when an object 12 transported by a conveyor hits the backstop main body 10 and pushes it down to pass. Since the rotational support shaft 14 of the backstop main body 10 is offset from the center of gravity, the lighter tip 16 is lifted by its own weight and plays the role of a backstop that limits the bouncing of the transported object 12. . In this method, in the backstopper body 10, the tip 16 is raised by the difference in weight between the left and right sides of the rotation support shaft 14, so that the tip 16 is raised after the conveyed object 12 has passed. is a late winner. Therefore, the transported object 1
If the tip 16 of the backstop main body 10 is not positioned at a considerable distance from the left end of the conveyed object 12 at the position where the backstop 2 contacts a leading stopper (not shown), it will not be able to fulfill its role as a backstop. The problem is that the stopping accuracy is poor.

On the other hand, in the vertically movable system shown in FIG. 2, a backstop main body 20 attached to the tip of a slidably supported rod 18 is urged by a tension spring 22 so as to project upward. When the conveyed object 24 that has been conveyed by the conveyor hits the backstop main body 20 and pushes it down, the backstop main body 20 returns to its original position due to the biasing force of the tension spring 22 and resumes its role as a backstop for the conveyed object 24. It is something that will be fulfilled. In this method, when the tension of the tension spring 22 is weak, the upward protrusion speed of the backstop main body 20 is slowed down, as in the tilting method, and conversely, when the tension of the tension spring 22 is increased, the transported object 24 becomes lighter. In this case, the conveyed object 24 conveyed by the conveyor is
0, the backstop main body 20 cannot be pushed down and stops, causing a problem in conveyance.

The present invention was developed against this background, and its purpose is to improve the rise of the back stopper so that the object being conveyed by the conveyor can be applied to the leading stopper. An object of the present invention is to provide a stopper device that quickly prevents bouncing when stopping a conveyed object, improves the stopping accuracy of a conveyed object, and does not cause any trouble in stopping or conveying the conveyed object even in the case of a light conveyed object. .

In order to achieve this purpose, the stopper device according to the present invention includes (a) a leading stopper that protrudes upward from the top surface of the conveyor and stops the conveyed object conveyed by the conveyor; and (b) at least a leading end stopper. (c) a backstop that is provided so as to be movable in the vertical direction in a straight line between an extended position where the part is located above the top surface of the conveyor and a retracted position that is located below the top surface of the conveyor; (d) between a first position where the backstop is moved to the retracted position against the biasing force of the elastic member and a second position where the backstop is allowed to move to the extended position; (e) a coupling device that connects the actuator and the backstop and allows the actuator to move to the second position with the backstop in the retracted position;

In the stopper device configured as described above, when the leading end of the conveyed object passes, the backstopper is retracted to a position below the conveyor by the actuator, and after the leading end passes, this retraction force is released. The backstopper is brought into contact with the lower surface of the conveyed object by the elastic force of the elastic member. Therefore, even if the elastic force of the elastic member is set to be relatively large, this will not hinder the passage of the conveyed object, and the backstopper biased by the elastic member with a large elastic force will Immediately after the conveyed object passes, it protrudes upward from the upper surface of the conveyor to prevent the conveyed object from bouncing back, resulting in the effect of increasing the accuracy of the stopping position of the conveyed object.

Moreover, in the stopper device according to the present invention, since the backstopper can move linearly in the vertical direction, no extra space is required to move between the protruding position and the retracted position. Also in this respect, the accuracy of stopping the transported object can be improved. If the backstop moves up and down by rotation as shown in Figure 1, after the object to be transported passes over the backstop, the backstop moves from the retracted position to the extended position. It is unavoidable that there will be a certain gap between the conveyed object and the backstop, which will reduce the accuracy of stopping the conveyed object.However, when the backstop moves linearly in the vertical direction, As a result, no gap is created between the conveyor and the conveyed object as the conveyor moves, and the stopping accuracy can be improved accordingly.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 3, the mount 30 is disposed perpendicularly to the underside of the roller conveyor 32. A holding member 34 is attached to the upper end of the front surface of the mount 30 to firmly hold the mount 30. A guide 36 is fixed to the mounting base 30 via a holding member 34, and a stopper shaft 38 is fitted into a hole formed in the guide 36 so as to be slidable in the vertical direction. A backstop main body 42 is attached to a flange 39 provided at the upper end of the stopper shaft 38 to prevent the transported object 40 from bouncing back when stopped. The backstop main body 42 is formed with a contact surface 44 that prevents the transported object 40 from bouncing back by contacting the transported object 40, and the position of this contact surface 44 is adjusted by an adjustment bolt 45. In addition, the stopper body 4
2 is fixed to the flange 39 with bolts. A tension spring 52 is provided on the holding member 34 on both sides of the guide 36, and the stopper shaft 38
The stopper shaft 38 is urged to protrude upward through a mounting plate 54 attached to the stopper shaft 38. The biasing force of the tension spring 52 can be adjusted using the adjustment screw 5 to which one end of the tension spring 52 is attached.
6.

On the other hand, a cylinder 4 is located below the stopper shaft 38.
6 is provided, and the piston rod 48 of the cylinder 46 is connected to the stopper shaft 38 by a connecting fitting 50 attached to the lower end of the stopper shaft 38. A long hole 58 is formed in the connecting fitting 50, and the piston rod 4 is inserted into this long hole 58.
A pin 60 attached to the tip of 8 is slidably fitted. When the piston rod 48 is retracted, the pin 60 comes into contact with the lower end of the elongated hole 58 and pulls down the stopper shaft 38 so that the backstopper body 42 is located below the upper surface of the roller conveyor 32. In addition, when the backstop main body 42 contacts the lower surface of the conveyed object 40 and cannot protrude upward, the piston rod 48
In order to prevent the stopper shaft 38 from being pushed up even when the piston rod 48 is moved forward, the pin 60 is prevented from coming into contact with the upper end of the long hole 58 of the connecting fitting 50 even at the forward end (rising end) of the piston rod 48.

Next, the operation of this backstop device will be explained.

First, the cylinder 46 is activated, the piston rod 48 is moved backward (downward), and the stopper shaft 38 is pulled down against the biasing force of the tension spring 52.
The backstop main body 42 is positioned below the roller conveyor 32. Next, the conveyed object 40 is carried in from the left side on the roller conveyor 32 in the direction of the arrow 62, and the leading end of the conveyed object 40 hits the leading stopper 64, but shortly before this contact, a limit switch (not shown) is activated. , a detection device such as a photoelectric switch is activated and switches the electromagnetic valve. As a result, the piston rod 48 moves forward (raises), the force pulling the stopper shaft 38 downward is released, and the tension spring 52 brings the backstopper body 42 into contact with the lower surface of the conveyed object 40. Immediately after the rear end of the object 40 passes through the backstop, the backstop main body 42 protrudes upward to prevent the object 40 from bouncing back. Since there is a certain time lag from the activation of the above-mentioned detection device until the piston rod 48 rises, it is necessary to take this time lag into consideration when adjusting the mounting position of the detection device.
8 can be raised at any time after the leading end of the transported object passes above the backstop main body 42 and before the rear end of the transported object passes, so this adjustment is easy. However, in order to improve the responsiveness (extrusion speed) of the backstopper body 42, the stopper shaft 38
It is desirable that the friction between the guide 36 and the guide 36 be as small as possible. Therefore, in this embodiment, a guide with a ball bushing is used.

Next, after removing the conveyed object 40 from the roller conveyor 32, when the piston rod 48 is retreated (lowered), the backstop main body 42 is pulled down below the roller conveyor 32, making it possible to carry in the next conveyed object 40. state.

Since the backstopper device of this embodiment is configured as described above, the backstopper body has good responsiveness, and has the advantage of being able to prevent bouncing of the conveyed object within an extremely short period of time and improve stopping accuracy. .

Further, since the backstop main body is lowered when the object to be conveyed passes through the conveyor, there is an advantage that the object to be conveyed does not climb onto the backstopper body and impede the conveyance.

Furthermore, since the time during which the backstop main body is in contact with the bottom surface of the conveyed object can be shortened, there is also the advantage that wear on the contact surface is reduced.

[Brief explanation of drawings]

1 and 2 are front views of the main parts of a conventional backstop device. FIG. 3 is a side view of a backstop device according to an embodiment of the present invention, and FIG. 4 is a front view of the same device. 10, 20, 42...back stopper body, 1
2, 24, 40...To be transported, 32...Roller conveyor, 36...Guide, 38...Stopper shaft,
44...Abutting surface, 46...Cylinder, 48...Piston rod, 50...Connection fitting, 52...Tension spring, 58...Elongated hole, 60...Pin.

Claims (1)

[Claims for Utility Model Registration] A leading stopper that protrudes above the top surface of the conveyor and stops the conveyed object conveyed by the conveyor; A protruding position in which at least the tip portion is located above the top surface of the conveyor; a backstop that is provided to be movable in a linear vertical direction between a retracted position located below the top surface of the conveyor; an elastic member that always urges the backstop toward the protruding position; and an attachment of the elastic member. an actuator that operates between a first position for moving the backstop to the retracted position against a force and a second position for allowing movement of the backstop to the extended position; and connecting the actuator and the backstop. and a coupling device that allows the actuator to move to the second position while the backstop is in the retracted position.