JP3145500B2 - Die opening mechanical stopper device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical stopper device for limiting the opening of a movable mold plate in an injection molding machine or the like.

[0002]

2. Description of the Related Art When a mold having a different thickness is exchanged in an injection molding machine or the like, it is necessary to adjust a stroke of a movable mold board with respect to a fixed mold board. Conventionally, the adjustment of the stroke of the movable mold board has been performed by, for example, a retraction restricting device (Japanese Utility Model Publication No. 59-41075) shown in FIG. FIG. 4 is a partial plan view of the vicinity of the movable mold platen of the injection molding machine. In FIG. 4, a retraction restricting device on the side indicated by an upper stop bar 9 is a first example of a conventional system, and is indicated by a lower stop bar 100. The retraction control device on the side is a second example of the conventional system. First, a first conventional example will be described. Reference numeral 1 denotes a movable mold plate to which a mold 2 is fastened. The movable mold plate 1 is guided at four corners by tie bars 3 and is illustrated by a mold clamping cylinder 4 partially omitted. It is possible to retract the mold that is fastened to the fixed mold plate. Further, ears 5 and 6 projecting from both sides of the mold clamping cylinder 4 are provided with holes 7 and 8 formed in parallel with the axis of the tie bar 3, respectively, and the holes 7 and 8 are threaded lengths. Stop bar 9 of a length is fastened to a predetermined position, and movable die plate 1 abuts one end of the stop bar 9.
Can be positioned at a predetermined retreat limit position. When the stop bar 9 is tightened with the nuts 11 and 12, the two nuts 11 and 12 on both sides are rotated along the threaded portion 10 of the stop bar 9 without positioning the stop bar 9 at a predetermined position. However, since the setup time is not required, the following method for shortening the time required for the setup has been devised.

[0003] That is, reference numeral 100 denotes a stop bar, and holes 7, 7 formed in ears 5, 6 provided on both sides of the mold clamping cylinder 4.
As shown in FIG. 4, the cross-sectional shape is formed by a flat surface portion 101 parallel to both opposite side surfaces of the shaft portion, and a screw portion 102 is formed at both opposing arc portions. Reference numeral 103 denotes a fixing plate which is fastened to the holes on the opposite surfaces of the ears 5 and 6 via bolts 108. The fixing plate 103 has a square hole 104 at the center thereof which fits with the stop bar 100, and is circular. A groove 105 is engraved on the peripheral side surface at an angle of about 90 degrees, and holes 106 and 107 are formed at both ends. 109,1
Reference numeral 10 denotes a fastener having the same configuration that can be disengaged from the fixing portion, that is, the screw portion of the stop bar 100 from the outside of the ear portions 5 and 6. The fastener 110 includes a large ring portion 111 and a nut portion 11.
The large-diameter ring portion 111 has an inner diameter portion that fits with the fixing plate 103, and has a stepped hole 113 formed in the side surface as shown in FIG. Is inserted by a spring 116 and is pressed by the spring 116 to slide in the groove 105 of the fixing plate.
Pins 117 that fit into 06 and 107 are mounted movably in the radial direction. In the hole of the nut 112, FIG.
As shown in the figure, the stop bar 100
Screw portion 114 that is screwed with the screw portion 102, and the escape portion 11
5 are provided facing each other. Also, a reference surface 103a of a fixing plate fixed to the outer ends of the ears 5 and 6 shown in FIG.
The distance L between them is adjusted to an integral multiple of the screw pitch of the stopper shaft.

In order to change the mold and adjust the stroke of the movable mold platen 1, first, the stop bar 1 shown in FIG.
The tightening of the fasteners 109 and 110 that are screwed into 00 is released. Here, the fastener 110 will be described as an example. First, the pin 117 is pulled up to disengage the hole 106 from the tip of the pin 117, and the fastener 110 is connected to the pin 1 shown in FIG.
When it is turned 90 degrees to the position 17 ', that is, the position of the hole 107, the screwing between the fastener 110 and the stopper 100 is released, and the relief 115 corresponds to the screw 102 of the stop bar 100. It is possible to move in the direction. Next, the retracted position of the movable mold platen 1 is determined, the end of the stop bar 100 is pressed against a reference surface provided on the movable mold platen 1, the pin 117 is pulled up again, and the fastener 110 is rotated 90 degrees, and the pin 117 is rotated. The fitting is fitted into the hole 106 by the action of the spring 116, and the fastener 110 and the stop bar 100 are screwed together. At this time, if the pitch between the screw portion 102 of the stop bar 100 and the fasteners 109 and 110 is 4 mm, a maximum clearance of 4 mm may be generated between the reference surface 110a of the fastener 110 and the reference surface 103a of the fixing plate 103. In this case, the stop bar 100 is moved to bring the reference surfaces 103 and 110a into close contact with each other, and then the fastener 109 is tightened by the above-described operation. At this time, the position of the stop bar 100 moves back and forth within 4 mm. However, in the injection molding machine using the mold clamping cylinder, there is no particular problem because the regulation is only slightly moved.

[0005]

In the conventional stroke adjusting device for a movable mold board in an injection molding machine or the like, the stop bars on both sides for restricting the opening limit of the movable mold board are provided with two nuts or two sets each. However, since the position of the tip of the stop bar had to be determined by operating the fasteners, it took a lot of trouble and time to set up, the number of parts was large, and the cost was high. The present invention has been proposed to solve the above-mentioned conventional problems.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to an apparatus for restricting an opening limit of a movable mold plate moved by a mold clamping cylinder of an injection molding machine, wherein the apparatus is mounted so as to protrude to the side of the mold clamping cylinder. A rod support comprising a plate having a plane perpendicular to the axial direction of the clamping cylinder and a cylinder fixed to the plate and having an axis parallel to the axis of the mold clamping cylinder and having a flat bearing inside; A stopper rod having a thread portion with a fine screw pitch penetrating the cylinder of the rod support, the outer periphery is a conical surface, the inner cylinder portion is a female screw, and tightening while screwing with the thread portion of the stopper rod, In order to be able to separate by unscrewing, the chuck is biased in the direction in which the chuck opens in a hole that is equally divided in the circumferential direction and a hole that is drilled at right angles to the split surfaces of the chuck. And a sleeve having a female conical inner cylinder having the same taper as the conical surface of the chuck, and having a male thread formed on a part of the outer peripheral surface, and a male thread of the sleeve formed therein. A rod handle attached to the outer peripheral surface, and fixed to the rod support,
A holder having a female screw to be screwed with the male screw of the sleeve, and a holder provided with a clamp lever for preventing rotation of the sleeve, and an end of the stopper rod with respect to a flange surface of the mold clamping cylinder. The overrun of the movable mold board is regulated by contacting the abutment plate attached to the movable mold board, and this is used as means for solving the problem.

[0007]

[Function] To change the opening limit position of the movable mold plate, loosen the sleeve by turning the clamp lever and rotate the sleeve with the attached rod handle. The sleeve comes out and is tightened by the taper of the conical surface. Move away from the chuck, the chuck expands in the radial direction by the action of the compression spring,
Release and tighten the stopper rod. Next, open the movable mold plate, determine the mold open / stop position, place it at that position, stop the free end of the stopper rod slightly away from the abutment plate attached to the movable mold plate, and attach the sleeve The chuck is tightened by being rotated by the rod handle of (1), and screwed to the screw of the stopper rod for chucking. Next, the clamp lever is turned to tighten the sleeve to prevent rotation, and the position adjustment of the stopper rod is completed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. FIGS. 1 to 3 show an embodiment in which the present invention is applied as a device for restricting the opening limit of a movable die plate of an injection molding machine. In the figure, a rod support 22 is attached so as to protrude to the side of the mold clamping cylinder 4, and two flat bearings 23 are fitted in the cylindrical portion of the rod support 22. A stopper rod 24 penetrating the cylinder of the rod support 22 is supported by a flat bearing 23. The stopper rod 24 has a threaded portion 24a with a fine thread pitch, and a hole 24b for manual rotation is formed. is there. Reference numeral 25 denotes a chuck in which the inner cylindrical portion is a female screw having a fine screw pitch and is equally divided into three in the circumferential direction. The chuck 25 is screwed with the screw portion 24a of the stopper rod 24 and tightened or unthreaded. The outer periphery has a conical surface so that the rod support 22 can be separated therefrom, and a flange 25 a is provided on a surface in contact with the rod support 22.

Three compression springs 26 are housed in holes drilled at right angles to the split surfaces of the chucks 25 in a direction in which the chucks open. Chuck 2
5 is covered with the above-described chuck 25.
Has a female conical inner cylinder having the same taper as that of the conical surface, a male screw is partially formed on the outer peripheral surface, and a rod handle 28 is attached to the outer peripheral surface of the sleeve 27 where the male screw is not formed. Reference numeral 31 denotes a holder, which is screwed with a male screw of the sleeve 27 by a female screw provided inside and is fixed to the rod support 22, and has a clamp lever 32 for preventing the sleeve 27 from rotating. Further, the holder 31 is provided with an inner flange 31a that blocks the movement of the chuck flange 25a so that the chuck 25 does not move in the axial direction. On the other hand, a contact plate 33 for contacting the end of the stopper rod 24 for positioning for restricting the limit of the mold opening.
Is mounted on the movable mold platen 1.

Next, the operation will be described. In order to stop the movable mold platen 1 at the opening limit position, the control circuit normally operates by a signal from the position detection sensor, and the automatic valve is switched to stop the driving of the mold clamping cylinder. Since the movable mold platen 1 is stopped, it is not necessary for the stopper rod 24 to reach the contact plate 33 when the control circuit is operating normally. The mechanical stopper 21 is used as a safety device for preventing mechanical damage of components around the mold platen when an overrun of the movable mold platen 1 occurs due to any trouble in the control circuit. Accordingly, the setting position of the stopper rod 24 is such that the movable mold platen 1 is slightly opened from the contact plate 33 at the opening limit position.
4 is located at the end. When it is desired to change the opening limit position of the movable die 1, the sleeve 27 is loosened by turning the clamp lever 32, and the sleeve 27 is rotated by the attached rod handle 28. The chuck 25 is separated from the tightened chuck 25 in the radial direction by the action of the compression spring 26, and is separated from the stopper rod 24 by unfastening and screwing.

Next, the movable mold platen 1 is opened to determine a mold opening stop position, and is stopped at that position, and the free end of the stopper rod 24 is attached to the contact plate 33 attached to the movable mold platen 1.
The chuck 27 is tightened by rotating the sleeve 27 with the attached rod handle 28, and screwed into the screw 24 a of the stopper rod 24 for chucking. Next, turn the clamp lever 32 to rotate the sleeve 27.
To complete the position adjustment of the stopper rod 24. The screw 24a of the stopper rod 24
Can be adjusted only by a multiple of the screw pitch, but usually the stopper rod 24
There is a gap between the tip of the
There is no problem because overrun of the pitch is not enough to cause mechanical damage. If two sets of mechanical stoppers 21 are installed on both sides of the mold clamping cylinder 4 and the tip position of the stopper rod 24 must be finely aligned and adjusted, insert a tool into the hole 24b at the tip of the stopper rod 24. Adjustment is possible by inserting and rotating the stopper rod 24.

[0012]

As described in detail above, according to the present invention, when it is desired to change the opening limit position of the movable mold plate, the clamp lever is turned to loosen the sleeve, and the sleeve is rotated by the attached rod handle. , The sleeve comes out and separates from the chuck that was tightened with the conical taper,
The chuck expands in the radial direction due to the action of the compression spring, and separates by tightening and screwing the stopper rod. Therefore, according to the present invention, there is an effect that adjustment of the stop bar for positioning the opening limit of the movable die board can be performed with a simple operation and in a short time.

[Brief description of the drawings]

FIG. 1 is a side view of a mold opening stopper device according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a plan view of a conventional mold opening stopper device.

FIG. 5 is a sectional view taken along the line CC of FIG. 4;

FIG. 6 is a sectional view taken along line D-D in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Moving mold board 2 Die 3 Tie bar 4 Mold clamping cylinder 21 Mechanical stopper 22 Rod support 24 Stopper rod 25 Chuck 26 Compression spring 27 Sleeve 31 Holder 33 Backing plate

Claims (1)

(57) [Claims] An apparatus for restricting an opening limit of a movable mold plate moved by a mold clamping cylinder of an injection molding machine is provided so as to protrude from a lateral side of the mold clamping cylinder and form a plane perpendicular to an axial direction of the mold clamping cylinder. A plate support having a rod support comprising a cylinder fixed to the plate material, having an axis parallel to the axis of the mold clamping cylinder, and having a flat bearing inside;
A stopper rod having a thread portion with a fine thread pitch penetrating the cylinder of the rod support, and an outer periphery having a conical surface,
A chuck having an inner cylinder portion formed as a female screw, which is equally divided in a circumferential direction so that the inner cylinder portion can be tightened while being screwed with the screw portion of the stopper rod or separated by unscrewing. It has a compression spring that is housed in a hole drilled at a right angle to oppose the split surfaces of the chucks in a direction in which the chuck opens, and a female conical inner cylinder having the same taper as the conical surface of the chuck. A sleeve having an external thread formed on a part of the outer peripheral surface thereof; a rod handle attached to the outer peripheral surface of the sleeve having no external thread formed thereon; and a male screw of the sleeve fixed to the rod support. A holder having a female screw to be screwed with the screw and having a clamp lever for preventing rotation of the sleeve, wherein an end of the stopper rod is moved with respect to a flange surface of the mold clamping cylinder to the movable die plate. Mold opening limit mechanical stopper device is brought into contact with the attached caul plates, characterized in that to regulate the overrun of the mobile plate with.