JP3260299B2 - Fork level detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fork level detecting device for detecting the level of a fork by using a laser marker installed for detecting a fork insertion port of a pallet.

[0002]

2. Description of the Related Art In the prior art, when a laser marker is provided to detect a fork insertion port of a pallet,
When the fork was positioned near the lower worker, the fork was tilted visually and adjusted horizontally while tilting it back and forth, and then the fork was lifted, and the loading operation was performed while detecting the pallet insertion port with the laser marker. .

[0003]

In the above-mentioned prior art, the work of lowering the fork, adjusting the horizontal level, and further raising the fork must be performed repeatedly each time a loading operation is performed. It was troublesome and the work efficiency was poor.

[0004]

According to the present invention, a fork which comprises a movable vehicle body and a mast device for loading a load, a lift bracket which moves up and down, is arranged on the mast device, and the fork which inclines back and forth in a pair on the left and right. And a reference laser marker for irradiating the front of the vehicle body, and a detection laser marker is fixed to the fork inclined forward and rearward at the same height as and parallel to the reference laser marker when the fork is horizontal. To solve the above-mentioned problem.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to a reach type forklift (hereinafter referred to as a forklift) 1. In FIG. 4, the forklift 1 includes a movable vehicle body 2 and a reach cylinder (not shown). ), The mast device 3 is provided with a lift bracket 5 which moves up and down by expansion and contraction of a lift cylinder 4, and the lift bracket 5 is moved back and forth by a tilt cylinder (not shown). A pair of left and right forks 6 that are inclined are locked.

A hydraulic motor 7 is built in the vehicle body 2,
When the operator operates the cargo handling lever 8, the hydraulic motor 7 rotates to expand and contract the reach cylinder, the lift cylinder 4, and the tilt cylinder, so that the mast device 3 moves forward and backward, the lift bracket 5 moves up and down, and the fork 6 tilts forward and backward. Configuration.

[0007] The reference laser marker 9 is provided on the left and right forks 6.
Between the fork 6 and the lift bracket 5 at the same height as the horizontal plane. The irradiation direction is to irradiate horizontally in front of the vehicle body 2. When the pallet 10 is unloaded, an irradiation point 9A of the reference laser marker 9 to the pallet 10 when the fork 6 is at the insertion port is set in advance, and the worker confirms the irradiation point 9A and moves the fork 6 forward. Then, the pallet 10 is unloaded.

[0008] In the loading operation using these devices, the vehicle body 2 of the forklift 1 is moved to the front of the load, the fork 6 is leveled by the tilt cylinder, and the insertion port of the pallet 10 is detected by the reference laser marker 9. , The mast device 3 is advanced by the reach cylinder, and the fork 6 is
Is lifted by a small amount, the mast device 3 is retracted by the reach cylinder, and the fork 6 is lowered by the lift cylinder 4 to complete the operation.

A detection laser marker 11 which is a feature of the present invention.
In the present invention, is installed so as to irradiate horizontally to the left slightly from the center of the tilt bar 12 inclined forward and backward together with the fork 6 at the same height as the reference laser marker 9 as shown in FIG. The tilt bar 12 transmits the expansion and contraction of the tilt cylinder directly below the vertical surface of the fork 6,
The fork 6 is tilted back and forth.

During the unloading operation using the detection laser marker 11, regardless of the height of the fork 6, when the irradiation point 9A of the reference laser marker 9 is irradiated on the pallet 10 or the load (FIG. 1), the fork 6 is moved. By tilting forward and backward, when the irradiation point 9A of the reference laser marker 9 and the irradiation point 11A of the detection laser marker 11 are at the same height (FIG. 2), the worker can recognize that the fork 6 is horizontal. FIG.
2 shows respective irradiation points of the fork 6 when the pallet 10 is irradiated horizontally.

In the present invention, the positional relationship between the reference laser marker 9 and the detection laser marker 11 has been described in the above embodiment. However, the present invention is not particularly limited to this, and the positional relationship may be determined by a worker in advance. Even if the laser marker is installed at an angle or at a different height,
The same effect can be obtained by any installation method.

[0012]

According to the structure of the above embodiment, the front and rear of the fork is determined from the positional relationship between the reference laser marker conventionally installed for detecting the pallet insertion port and the irradiation point of the detection laser marker installed in the present invention. The angle of inclination is immediately known to the operator. Therefore, it is not necessary to lower the fork and move it to the side of the worker in order to level the fork, so that the conventional troublesome work is eliminated. Furthermore, the effect which leads to improvement of work efficiency is obtained.

[Brief description of the drawings]

FIG. 1 is a side view of a fork embodying the present invention in a non-horizontal state.

FIG. 2 shows a horizontal side view of a fork embodying the present invention.

FIG. 3 shows a front view of a lift bracket embodying the present invention.

FIG. 4 is a side view of a reach type forklift embodying the present invention.

FIG. 5 shows pallet irradiation points when a fork embodying the present invention is horizontal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reach type forklift 2 Body 3 Mast device 4 Lift cylinder 5 Lift bracket 6 Fork 7 Hydraulic motor 8 Cargo handling lever 9 Reference laser marker 9A Irradiation point 10 Pallet 11 Detection laser marker 12 Irradiation point

Claims (1)

(57) [Claims] A lift bracket which comprises a movable vehicle body and a mast device for loading loads is disposed on the mast device, and a pair of left and right forks are tilted forward and backward to the lift bracket, and the front of the vehicle body is irradiated. A fork level detecting device comprising: a reference laser marker; and a detection laser marker fixed to the fork tilted back and forth so as to be at the same height and parallel to the reference laser marker when the fork is horizontal.