JPH0228418A - Stopper device - Google Patents

Abstract

PURPOSE:To prevent the rebound of a pallet and stabilize the stop position thereof in a stopper device for a conveyor carried article by providing a cushion member rotatable in a cushioning direction upon the contact of the article with a stopper member and an engagement means for hooking the stopper at the turning position thereof. CONSTITUTION:A shift base 13 is lifted with a pneumatic pressure cylinder 14, and a cushion stopper device 15 is thereby operated and kept at a non-operation position. When the aforesaid cushion stopper device 16 is at an operation position, a pallet PA moving from the right side comes in contact with a roller 31. A stopper member 22 is thereby turned left and the contact surface 32 thereof pushes down a cushion piston 33a, thereby embodying the cushion effect of a cushion device 23. In this case, an engagement claw 24 energized with a spring 27 in a right direction comes to be engaged with an engagement part 34 and the stopper member 22 is locked at a left-turn position, thereby preventing the rebound of the pallet PA. When the cushion stopper device 15 moves down, the engagement claw 24 comes in contact with a release pin 15 and engagement is released, thereby resetting the stopper member 22. According to the aforesaid construction, the stop position of the pallet PA can be stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stopper device for stopping a conveyed object conveyed on a conveyor at an appropriate position.

[Prior Art] Free-flow conveyors have often been used to convey objects such as pallets, and in order to stop the pallets that have been conveyed on the free-flow conveyor, they are moved up and down at the stop position. A stopper device is used.

A conventional stopper device consists of a movable base that moves up and down using a pneumatic cylinder or the like, a stopper member that is rotatably attached to the movable base with a shaft pin and rotates in the buffering direction when a conveyed object comes into contact with it, and a stopper. The stopper member is configured to dampen the rotation of the member in the damping direction and urge the stopper member in a direction opposite to the damping direction.

In such a stopper device, when the pallet comes into contact with the stopper member when the movable base is at the rising end, the stopper member rotates, and the buffer member exerts a buffering effect, and the pallet is protected from the impact. Stop when there is no

[Problem to be Solved by the Invention] However, in the conventional stopper device described above, the stopper member and the buffer member need to return to their original positions or states after the pallet has passed, so the buffer member does not automatically return. type, or a return spring member is attached separately from the buffer member. Therefore, after the balent comes into contact with the stopper member and stops, the pallet also rebounds and moves backward as the buffer member or spring member automatically returns, resulting in a problem that the stopping position of the pallet is not stable.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a stopper device that eliminates bouncing back after a conveyed object such as a pallet has stopped and provides a stable stopping position.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a movable base movable between a stop operation position for stopping a conveyed object conveyed on a conveyor and a passing operation position for passing the conveyed object; a stopper member rotatably attached to the base by a shaft pin, and when in the stop operation position, the conveyed object comes into contact with the stopper member and thereby rotates in the buffering direction;
In the stopper device, the stopper device includes a buffer member that buffers rotation of the stopper member in a buffering direction and urges the stopper member in a direction opposite to the buffering direction, wherein the stopper member is provided with a locking portion. The stopper member is rotatably provided with respect to the movable base and engages with the locking portion at a position where the stopper member is rotated in the buffering direction, thereby causing the stopper member to move in a direction opposite to the buffering direction. It is characterized by having a locking pawl that restricts rotation, and a release member that releases the engagement of the locking pawl with the stopper member at the passing operation position.

[For production]

When the movable base is in the stop operation position, the conveyed object comes into contact with the stopper member. When the conveyed object comes into contact with the stopper member, the stopper member rotates in the buffering direction,
At this time, the buffer member exerts a buffering effect, and the conveyed object is stopped with a small impact.

When the stopper member rotates in the buffering direction, the locking portion engages with the locking pawl at the rotated position, thereby preventing the stopper member from returning in the opposite direction to the buffering direction.

When the movable base moves to the passing operation position, the stopped pallet is conveyed again, the locking pawl is disengaged from the locking part by the release member, and the stopper member and buffer member return to their original positions. Return to.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional front view of a stopper device according to the present invention.

The frame 2 of the free-flow type conveyor 1 is provided with a large number of rollers 3, including those that are rotationally driven and those that are not rotationally driven. being transported to.

A stopper device 1 provided at the bottom of the frame 2 is attached to the board 4 for stopping the pallet PA being transported.
0 is attached.

The stopper device 10 includes a housing 11, a sliding member 12,
a cylindrical moving base 13 that slides within the sliding member 12;
It is comprised of a pneumatic cylinder 14 that reciprocates the movable base 13 in the vertical direction, a buffer stop device 15 attached to the upper end of the movable base 13, and the like. Note that the housing 11 is provided with a hole 11a through which a shock absorber 23 (to be described later) moves up and down, and although not shown, in order to prevent the movable base 13 from rotating, the movable base 13 is provided with a hole 11a. A flat part is formed on the circumferential surface of housing 13, and a plate that slides on this flat part is attached to the upper end surface of housing 11.

The buffer stop device 15 includes a bracket 20 attached to the upper end surface of the movable base 13 with bolts, and a stopper member 2 rotatably attached to the bracket 20 via a shaft pin 21.
2. A shock absorber 23 attached to the bracket 20 so that the buffer piston 23a faces upward; a locking claw 24 rotatably attached to the bracket 20 via a shaft pin 25;
It is composed of a stop position regulating ring 26, a spring member 27 that urges the stopper member 22 and the locking claw 24 in a direction in which they open each other, and the like.

In its free state, the shock absorber 23 has a shock absorber piston 23a.
The shock absorber 2 is of a type that automatically returns to the extended end.
3, the contact surface 32 of the stopper member 22 is pushed upward by the tip of the buffer piston 23a, and the stopper member 22 overcomes the biasing force of the spring member 27 and rotates to the right in the figure, as shown by the solid line. It becomes.

A roller 31 is attached to the upper end of the stopper member 22, and when the tip of the pallet PA that has been conveyed from the right side in the figure comes into contact with the roller 31, the stopper member 22 is moved leftward (buffered) by the momentum. direction) and contact surface 3.
2 pushes down the buffer piston 23a, and the buffering effect of the buffer device 23 is exerted. Then, the contact surface 32 stops at a position where it contacts the stop position regulating ring 26, and reaches the state shown by the chain line in the figure.

Locking pawl 2 biased toward the right in the figure by a spring member 27
4, normally its tip 24a is in contact with the arcuate surface 33 provided on the stopper member 22, but when the stopper member 22 is in the state shown by the chain line as described above, as shown by the chain line, The distal end portion 24a fits into the locking portion 34 provided at the end of the arcuate surface 33, and the leftward movement of the locking portion 34, that is, the rightward rotation of the stopper member 22 is restrained.

Therefore, when the pallet PA comes into contact with the roller 31 and is buffered by the shock absorbing device 23 and stops without any impact, the locking portion 34 engages with the locking pawl 24 and the stopper member 2
2 is restricted from rotating to the right, and rebound due to the automatic return force of the shock absorber 23 is prevented. As a result, the stop position of the pallet PA becomes stable, the stop position accuracy becomes high, and it becomes easier to process or assemble the workpieces placed on the pallet PA.

In the state shown in the figure, the movable base 13 and the buffer stop device 15
is in the stop operation position for stopping the pallet PA, but in order to allow the pallet PA to pass by the roller 3, the moving base 13 is lowered by the pneumatic cylinder 14 so that the roller 31 does not interfere with the pallet PA. Move it to the passing operation position that has been lowered to the lower position.

A release pin 16 is attached to the upper surface of the housing 11, and when the RI street stop device 15 descends and reaches the passing operation position, the lower surface of the locking pawl 24 comes into contact with the release pin 16, thereby releasing the locking pawl. 24 rotates to the left, and its tip 2
4a and the locking portion 34 of the stopper member 22 are disengaged,
The stopper member 22 is rotated to the right by the automatic return force of the shock absorber 23 and returns to its original position and state.

After the pallet PA has passed, the buffer stop device 15 is raised again to the stop operation position by the pneumatic cylinder 14, and waits for the next pallet PA to be transported.

In the embodiments described above, the shock absorber 23 can be of various types or shapes, such as a pneumatic type, a hydraulic type, a spring type, or a combination of these types. Further, in the above embodiment, the case where the shock absorber 23 itself is of an automatic return type has been described, but a shock absorber which is not an automatic return type and a spring member for return provided separately from this shock absorber are used. It may be a combination of.

In the above-described embodiment, one spring member 27 was used to bias the stopper member 22 in the counterclockwise rotation direction and to bias the locking pawl 24 in the clockwise rotation direction. The spring member may be of various types such as a pneumatic spring member or a gravity spring member. moving base 13, stopper member 22,
The materials, structures, shapes, dimensions, etc. of the locking claw 24, the release pin 16, and other members can be selected from various suitable materials or changed as appropriate. Further, the present invention can be applied to various types of conveyors.

〔Effect of the invention〕

According to the present invention, bouncing back after a transported object such as a pallet is stopped can be eliminated, and a stable stopping position can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional front view of a stopper device according to the present invention. 1... Conveyor, 10... Stopper device, 13...
・Moving base, 16...Release pin (release member), 21.
...Axis pin, 22...Stopper member, 23...Buffer device (AI impact member, 24...Latching claw, 34...Locking portion, PA...Pallet.

Claims (1)

[Claims] (1) A movable base that is movable between a stop operation position where the conveyed object is stopped on the conveyor and a passing operation position where the conveyed article is passed, and the movable base is rotatable by an axis pin. a stopper member which is attached to the stopper member and which the conveyed object comes into contact with and rotates in the buffering direction when the conveyed object is in the stop operation position; a buffer member that biases in a direction opposite to that of the stopper device, wherein the stopper member is provided with a locking portion, and the stopper member is rotatably provided with respect to the movable base. a locking claw that engages with the locking portion at a position where the stopper member rotates in the buffering direction to restrict rotation of the stopper member in a direction opposite to the buffering direction; A stopper device comprising: a release member that releases engagement with the stopper member.