JPH0664017A - Movable safety step board on injection molder - Google Patents

Abstract

PURPOSE:To provide a movable safety step board, with which operation around mold platens can be performed easily without impairing safety and, at the same time, at the easily workable height and which can cover the whole surface of a floor surface so as to enhance the safety more during operation. CONSTITUTION:The step board concerned consists of one guide rail 45 and one guide rail 46, both of which are fixed on the floor surface of a bed 12 provided between a fixed mold pattern 11 and a movable mold platen 12, a linear guide rail 47, which is fixed between and parallel to both the guide rails to the bed 12, every two wheels 52 and linear bearings 51 mounted on the guide rails, a step board frame 53, which is stepped so as to span a tie bar 14, a second-layer step board 55, which is mounted through a plurality of elastic bodies 54, and a limit switch, which is actuated by the lowering of the step board 55 developed through the depression of the elastic body 54 caused with a worker by mounting the step board.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable safety tread for an injection molding machine, which is applied to a safety tread device for working around a mold while the injection molding machine is stopped.

[0002]

2. Description of the Related Art Conventionally, various safety tread plate devices have been proposed for preventing the mold clamping operation from being performed as long as an operator steps on a work tread plate while inside the mold clamping device. . As an example thereof, the one proposed in Japanese Utility Model Publication No. 2-35472 will be described with reference to FIGS. In FIG. 5 to FIG. 8, reference numeral 11 denotes a fixed die plate fixed to the bed 12. Numeral 13 is a movable mold platen which moves forward and backward with respect to the fixed mold platen 13 by a moving cylinder (not shown) to open and close a mold (not shown). 14 is a tie bar. 15 is a safety tread, which is the mold clamping device, that is, the fixed mold plate 1.
1 and the movable mold platen 13 are provided along the upper surface of the bed 12, and are supported by a pedestal 16. As shown in FIG. 7, the pedestal 16 is provided with a spring 19 between the pedestal 16 and a spring receiver 18 attached to the tread 17, and a small gap L is maintained by a nut 20. When an appropriate weight is applied to the upper part of the spring, the spring 19 bends to make a stroke of the dimension L, and the stroke causes the limit switch 21 to operate to control the safety door (indicated by a chain line 22) or the mold. The drive source and hydraulic power source of the tightening operation control circuit are shut off.

Reference numeral 23 is a gate-type safety tread device, which is located inside the safety door 22 and has a gate-shaped main body which is provided so as to straddle the tie bar 14 in a gate-shaped manner, and has both legs 23a and 23b of the main body.
Is provided with a roller 24, a sliding plate, etc., and the roller 24, the sliding plate, etc. are fitted to the traveling rail 26 and the guide rail 27 of the safety door 22, respectively, and move on the rail in the mold clamping direction. You can do it. Further, a tread plate 28 is provided on an upper surface plate 23c that laterally connects the two legs 23a and 23b of the gate type safety tread device 23, and one end of the upper surface plate 23c of the safety tread device is provided as shown in FIG.
Is attached by a hinge 29, and the other end is supported by a spring 31 placed in a pedestal 30 to ensure an appropriate distance L. A pin 32 is attached to the tread plate 28, and when an appropriate load is applied to the tread plate 28, the spring 31 bends and strokes by the dimension L, and the limit switch 33 operates due to this stroke. The operation of the safety door and the mold clamping device is stopped in the same manner as the safety tread 15 of FIG. Further, since the gate-type safety tread device 23 can travel on the rail 26 and the guide rail 27 in the mold clamping direction, there is an advantage that the setting position of the gate-type safety tread device different depending on the thickness of the mold can be moved. is there.

[0004]

However, the above-mentioned FIG.
Since the work safety step 15 fixed to the bed 12 of the injection molding machine shown in FIG. 8 is provided at a low position in order to avoid the moving space of the movable mold board 13, when the injection molding machine is large, The top is out of reach. In addition, if another workbench is brought in from the outside, there is a defect that the effect of the safety limit switch 21 may change or may not work. The present invention has been proposed to solve the above conventional problems.

[0005]

Therefore, according to the present invention, in the work safety tread plate provided on the bed floor between the fixed mold plate and the movable mold plate of the injection molding machine, the space area through which the movable mold plate passes. One guide rail fixed to the bed in the moving direction of the movable mold plate on the lateral outer side and lower side of the mold plate avoiding the above, and a space area through which the movable mold plate similarly passes between the two guide rails. A linear guide rail fixed to the bed in parallel with the guide rails, two wheels each guided by the two guide rails, and the intermediate linear guide below the mold plate avoiding A linear bearing, which is restrained vertically and horizontally by rails, is attached to the tread plate frame, which is made to have a dimension width smaller than the mold plate interval when the mold plate is closed and has a step over the tie bar. Attached to the frame via multiple elastic bodies A two-step tread whose width is made the same as that of the tread frame, a limit switch which is activated by the elastic body being pushed down when the operator rides on the tread, and the tread, It is composed of an attached stopper and can freely slide in the moving direction of the mold platen to stop at any position when the movable mold platen is opened. It is what Further, the present invention is adjacent to the mold mounting side of the fixed mold plate of the injection molding machine, and is fixed to the bed floor surface below the frame of the safety tread so as not to interfere with the movable safety tread, A fixed safety tread having the same width as the movable safety tread, a frame, an elastic body, and a two-step tread similarly, and a fixed safety tread equipped with a limit switch so that the mold mounting surface of the movable mold plate does not interfere with the movable safety tread. A safety board having a limit switch, which is mounted at a position higher than the movable safety tread, is composed of a frame having the same width as that of the movable safety tread, a plurality of elastic bodies, and a two-step tread; When the board is in the open position, the movable safety tread consists of stopper means by a projection provided on the frame of each tread for stopping and placing the movable safety tread in the middle between the fixed safety tread and the mold board safety tread, Template In which the floor surface between the both mold platen when the opening is so as to be covered by the entire safety treadle is for a means for this problem solution.

[0006]

When the movable mold platen is open, the movable safety tread can be freely slid in the moving direction of the mold platen and can be stopped at any position. When an operator rides on the tread plate, the elastic body contracts, the tread plate lowers and pushes the limit switch, and an electric signal is sent to the control device of the main machine to cut off the circuit for operating the movable mold board. When the movable mold platen is open, the entire floor surface between the mold plates is covered by the safety plate, and when the movable mold platen is closed, the three safety plate plates are overlapped with each other so that the space between the mold plates is large. It is stored.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments of the drawings. FIGS. 1 and 2 show a first embodiment, and FIGS. 3 and 4 show a second embodiment. First, referring to FIGS. 1 and 2, 4
2 has a width that does not interfere with these when the mold plate of the injection molding machine is closed, and when the mold plate is open, it can be slid in the moving direction of the movable mold plate 13 and stopped at an arbitrary position. It is a movable safety tread. Further, the guide rail 45 is provided on the outer side of the mold board 13 avoiding the space area through which the movable mold board 13 passes, and the guide rail 46 is provided on the lower side of the mold board 13 by the rail mount 49 so that the movable mold board 13 is movable. It is fixed to the bed 12 so as to face the moving direction of 13.
Further, between the guide rails 45 and 46, a linear guide rail 47 is supported by a rail base 50 in parallel with the guide rails 45 and 46 on the lower side avoiding a space area through which the movable mold plate 13 similarly passes. It is fixed to the bed 12. Reference numeral 53 is a tread frame which has a width smaller than the space between the mold plates when the mold plates are closed, and includes two guide rails 45, 4
Two wheels 52 each running on 6 and linear bearings 51 that are vertically and horizontally constrained by the intermediate linear guide rail 47 are attached. Further, the step board frame 53 is provided with a step over the tie bar 14,
Further, a two-step tread 55 having a width smaller than the space between the mold plates when the mold plate 13 is closed is attached to the tread frame 53 through a plurality of elastic compression springs 54. . A limit switch 56 is mounted on the tread plate 55. The limit switch 56 is operated by the compression spring 54 being pushed when an operator rides on the tread plate 55 and the tread plate 55 being lowered.
A stopper 57 is attached to 5.

FIG. 2 shows the structure of the tread frame 53, the compression spring 54 attached to the tread frame 53, the tread 55, the limit switch 56 and the stopper 57 attached to the tread 55. The compression spring 54 is contained in the outer cylinder 61 and is in contact with the tread plate 55. The outer cylinder 61 is fitted in a guide cylinder 53a provided on the tread frame 53 and freely slides. A spring receiver 63 is attached to the guide cylinder 53a by a bolt 64, and the compression spring 54 is biased and is housed between the tread 55 and the spring receiver 63. Stopper 5 on tread 55
7 is attached, and the shaft of the handle shaft 58 is fitted into the through hole of the bracket 60 of the stopper 57.
A stopper lever 59 is attached to the lower end of 8.

The operation will now be described. When the movable mold platen 13 is opened, the movable safety tread plate 42 can freely slide in the moving direction of the mold platen and can be stopped at any position. When an operator rides on the tread 55, the compression spring 54
Contracts, the tread 55 lowers and pushes the limit switch 56, and an electric signal is sent to the control device of the main machine to cut off the circuit for operating the movable mold board. On the other hand, if you turn the handle shaft 58,
The stopper lever 59 rotates and pushes up the rail 45 from the lower side to apply the friction brake, and at the same time, pushes down the tread plate 55 to operate the limit switch 56.

Next, the second embodiment will be described with reference to FIGS. 3 and 4. In this embodiment, the lower sides of both mold plates 11 and 13 are covered with the entire safety tread even when the mold plates 13 are fully opened. It was done. That is, in addition to the movable safety tread 42 of the first embodiment, it is safe so as not to interfere with the tread 55 or the tread frame 53 of the movable safety tread 42 adjacent to the mold mounting side of the fixed mold plate 11 of the injection molding machine. Tread frame 53
The footboard frames 72, 74 are fixedly mounted on the floor surface of the lower bed 12 with abutments 76, 77, 78, etc.
4 is a compression spring 5 similar to the movable safety tread 42 of the first embodiment.
4 and 2 steps tread 80, tread 81 and limit switch 56
A fixed safety tread 43 to which is attached is provided.

Further, a tread plate frame 85 is fixed to the mold mounting surface of the movable mold plate 13 at a position higher than the tread plate 55 so as not to interfere with the movable safety tread plate 42.
A pattern board safety tread 44 to which a compression spring 54, a two-step tread 86 and a limit switch 56 similar to the above are attached is provided. The width of the pattern board safety tread 44 is also the same as the width of the movable safety tread 42. Further, as shown in FIG. 4A, an upward protrusion 74a and a tread frame 53 are provided on the edge of the tread frame 74.
An upward projection 53c and a downward projection 53b on both end edges of the
A downward projection 85c is provided on the edge of the tread frame 85. Each of these protrusions is arranged on the same vertical surface in the moving direction of the mold board, and serves as a stopper to prevent the movable safety tread 42 from overrunning. Brackets 85a and 85b are provided on both sides of the tread frame 85,
Wheels 52 traveling on the guide rails 70, 71 are attached to the rails, and the weight of the operator is shared with the tread frame 85 and its attached parts. In FIG. 4, reference numeral 40 denotes a mold on the fixed mold board 11 side, and 41 denotes a mold on the movable mold board 13 side.

The operation of the embodiment shown in FIGS. 3 and 4 will now be described. When the movable mold platen 13 is fully opened as shown in FIG. 43,
It is covered by 44. Then, the compression spring 54 and the limit switch 56 are set by the operator in three sets of the safety treads 42, 4
Even if you step on any part of 3, 44, the limit switch 56
Are arranged to work. Further, as shown in FIG. 4B, when the movable mold platen 13 is closed, the three safety treads 42,
The mold board safety step board 44, the movable safety step board 42, and the fixed safety step board 43 are stacked in this order from the top, and they do not interfere with each other.

[0013]

As described in detail above, the work safety tread according to the present invention can be freely slid in the moving direction of the mold board and can be stopped at any position, so that the work around the mold board is safe. It will be easy without loss. Also, since this safety tread has a width smaller than the mold plate spacing when the mold plate is closed, in the case of a large injection molding machine, make it a height that is easy to work within the range that does not hit the mold. You can Further, in the invention of claim 2, when the mold plate is open, the floor surface between both mold plates is covered with the entire safety tread plate, so that the safety during work can be further enhanced.

[Brief description of drawings]

FIG. 1 is a perspective view of a mold plate for an injection molding machine having a movable safety tread according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of a main part in FIG.

FIG. 3 is a perspective view of a mold plate for an injection molding machine in which a safety tread is mounted on the entire surface according to a second embodiment of the present invention.

FIG. 4 is a partial cross-sectional side view showing an open state and a closed state of the movable mold platen in FIG.

FIG. 5 is a side view showing a safety tread plate in a conventional injection molding machine.

6 is a sectional view taken along line AA of FIG.

7 is a vertical cross-sectional view of a main part in FIG.

FIG. 8 is a partial cross-sectional detailed view of a main part in FIG.

[Explanation of symbols]

 11 Fixed type board 12 Bed 13 Movable type board 14 Tie bar 42 Movable safety step board 43 Fixed safety step board 44 Type board safety step board 45,46 Guide rail 47 Linear guide rail 51 Linear bearing 52 Wheel 53 Step board frame 54 Elastic body 55 Two step step board 56 Limit switch 57 Stopper 80, 81 Fixed safety tread 86 Movable plate safety tread

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryoichi Inoue No. 1 Takamichi, Iwazuka-cho, Nakamura-ku, Nagoya City Mitsubishi Heavy Industries, Ltd. Nagoya Machinery Works (72) Inventor Akihisa Watanabe Kyutansho, Iwatsuka-cho, Nakamura-ku, Nagoya No. 60 at 1 Nakabishi Engineering Co., Ltd. (72) Inventor Shinichi Enomoto Kutane, Iwazuka-cho, Nakamura-ku, Nagoya City No. 1 at Nakabishi Engineering Co., Ltd.

Claims (2)

[Claims] 1. A work safety tread provided on a bed floor between a fixed mold plate and a movable mold plate of an injection molding machine, wherein a lateral side and a lower side of the mold plate avoiding a space area through which the movable mold plate passes. One guide rail fixed to the bed on the side in the moving direction of the movable mold plate, and on the lower side of the mold plate that avoids the space area through which the movable mold plate passes in the middle of both guide rails. Linear guide rails fixed to the bed parallel to the guide rails, two wheels each guided by the two guide rails, and a linear constrained vertically and horizontally by the intermediate linear guide rails. Bearings are attached to the tread frame, which has a width smaller than the space between the mold plates when the mold plate is closed, and has a step over the tie bar, and is attached to the tread frame through a plurality of elastic bodies. The width is the same as the tread frame A two-step tread having dimensions, a limit switch that is activated when the elastic body is pushed and the tread is lowered when an operator rides on the tread, and a stopper attached to the tread, A movable safety tread plate for an injection molding machine, which is capable of freely sliding in the moving direction of the mold plate and stopping at any position when the movable mold plate is open. 2. The movable safety tread plate for an injection molding machine according to claim 1, which is adjacent to a mold mounting side of a fixed mold plate of the injection molding machine, and which is formed of a frame of the safety tread plate so as not to interfere with the movable safety tread plate. A fixed safety tread that is fixed to the lower bed floor, is of the same width as the movable safety tread, and is similarly composed of a frame, an elastic body, and a two-step tread, and has a limit switch, and a movable platform. The mold mounting surface is mounted at a position higher than the movable safety tread so as not to interfere with the movable safety tread, and is constituted by the same frame having the same width as the movable safety tread, a plurality of elastic bodies, and a two-step tread, A safety board with a limit switch and, when the movable mold board is in the open position, each of the footboards for stopping the movable safety board in the middle of the fixed safety board and the safe board of the board. Provided on the frame of A movable safety tread plate for an injection molding machine, which comprises a stopper means by a raised protrusion, and the floor surface between the two mold plates is covered by a whole safety tread plate when the template is fully opened.