JPH01208112A - Cutting device of gate of plastic molded product - Google Patents

Abstract

PURPOSE:To enable the title device to cut off a gate favorably even if there is a positional deviation between a nipper blade and the gate, by a method wherein a tool rest where a pair of the nipper blades are provided is fitted turnably on a base stand and both sides of an air nipper blade side of the tool rest are prepared on the base stand in a stretched state with a pair of tension springs. CONSTITUTION:An air cylinder 48 and tool rest 49 are united respectively to the lower and upper sides of a swivel base 46 of a cutting device of a gate, a pair of tension springs 50 are provided on both sides of the tip part of the tool rest 49 and a pin 37a on a rising and falling stand 37 in a stretched state, the tool rest 49 is pulled toward both sides with the tension springs and in a balanced state. A rod 51 of the cylinder 48 is connected with a pair of nipper blades 55 through a clevis 52 and a forked arm 53. Then when either of blade surfaces of the pair of the nipper blades 55 abuts against a gate 15, registration is performed through selfturning of the nipper blade 55. When the air cylinder 48 is actuated with this constitution, the nipper blade 55 is closed and the gate 15 projected into a vessel 14 is cut off.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a gate cutting device for plastic molded products, and more specifically, to a gate cutting device for a gate cut device for a plastic molded product, and more specifically, to cut a sprue protrusion left behind on the back side of a plastic container molded by an injection molding machine. (This is called a gate or spool runner.)

This invention relates to a cutting device for a gate (hereinafter referred to as a gate).

[Conventional technology and its issues]

Plastic containers (hereinafter simply referred to as containers in this specification) such as barrels, waste baskets, buckets, flowerpots, colanders, and container boxes are molded using injection molding machines. During this molding, heated resin is injected from the bottom of the container, so a protrusion called a gate remains on the bottom of the molded container.

In order to cut such a gate, a gate cutting device equipped with an inclined air nipper and a chuck mechanism for holding the gate is known (for example, the
(See Publication No. 404).

However, in such a gate cutting device, the container remains in the core of the molding machine, and therefore, the gate in a fixed position is clamped in advance by a pair of chuck mechanisms for taking out the container from the core, and then cut with an air nitz bar. Therefore, in order to cut the gate of the container once removed from the core, it is difficult to align the gate and the air nipper. Furthermore, even if used, one of the pair of air nipper blades may hit the gate unevenly, resulting in a force-cutting action and a reduction in sharpness.

[Means to solve the problem]

Therefore, the present invention was created to solve the problems in the conventional example, and its gist is that a pair of nipper blades are used to cut a gate protruding from the end face of a plastic molded product. In the gate cutting device equipped with air nippers, the pair of air nippers
A support shaft on which the blade is pivoted so that the blade can be opened and closed, a tool rest on which the support shaft is erected, a base on which the tool rest is rotatable and moves toward and away from the gate, and a nipper in the tool rest. - a pair of tension springs tensioning both sides of the blade side and the base;
Gate cutting equipment for plastic molded products consisting of

(Example) The structure of the present invention will be described in detail based on an example shown in the accompanying drawings.

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a front view of an embodiment of the present invention.
1~Sl' cross-sectional view, Figure 3 is a sectional view of 82~S2° in Figure 2, Figure 4 is a cross-sectional view of 83~S3° in Figure 2, Figure 5 is a sectional view of 34~34 in Figure 2. ' Shows an arrow view.

This embodiment is a gate cutting device for cutting a gate protruding from the bottom surface of a container such as a bucket formed by an injection molding machine. In particular, a border ring 14a is molded on the bottom surface, and the center point of the border ring 14a is This invention relates to a gate cutting device in which a gate 15 is projected and the gate 15 is cut without being obstructed by a border ring.

[Alignment mechanism between gate and air nipper blade] Now, the container 14 is taken out from the core (not shown) of the molding machine, and its inner bottom is sucked and held by the vacuum pad 57. The gate cut device A is the container 1
4 from both sides of the container 14 between a pair of container sandwiching plates 28° 28, align the gate 15 and the air nipper blade 16, and then use the air nipper blade 16 to hold the aligned gate 15. Configured to cut.

To explain this in detail, mainly in FIGS. 1 and 2, reference numeral 10 denotes a gate cut carriage, which is installed astride support frames 9.9 provided on both sides. Since the left and right sides have approximately the same structure, only one side will be described below. This gate cut carriage 10 is configured to reciprocate in the Y direction in FIG. 1 by means of cylinders 11 on both sides mounted on a support frame 9. Therefore, a Y-direction linear guide rail 13 is attached to the upper surface of the support frame 9, and a Y-direction movable linear guide block 12 provided on the lower surface of the gate cut carriage 10 slides on the Y-direction linear guide rail 13. It is supposed to be done. Therefore, due to this sliding movement, the air nipper blade section 16 installed on the gate cut carriage 10 is moved to the gate 1 of the container 14.
5, alignment in the Y direction is possible.

On this gate cant carriage 10, as shown in FIG. 2, a pair of X-direction rails 18 are fixed with screws perpendicular to the Y-direction linear guide rails 13 (
(See Figure 2). A horizontal push-type linear guide block 17 is guided on the side of this X-direction rail 18, and a movable table 19 is supported by this horizontal push-type linear guide block z7. Therefore, this movable table 19 is adapted to slide in the X direction via the horizontal push type linear guide plate 17 and the X direction rail 18. And the first
As shown in the figure, brackets 21 are provided at both ends of the carriage 10, and brackets 2o are provided at the sides of the movable table 19. A tension spring 22 is tensioned.

Therefore, the moving table 19 is the gate cut carriage 1o.
On the other hand, it is pulled in both outward directions and is in an equilibrium state.

Next, as shown in FIG. 2, a rope car support 23 is provided at the center of the moving platform 19. That is,
This rope car support stand 23 vertically penetrates the moving stand I9 and is erected on the moving stand 19, and this rope car support stand 23 is placed with a slight gap from the gate cut carriage 10. There is. Two lobe wheels 24 and 24 are attached to the upper part of the rope wheel support stand 23 so as to rotate freely (see FIG. 1).
5 are wrapped around each other, and one end of these rows 125° 25 is combined into one by a U metal fitting 32. Furthermore, this U metal fitting 32 is attached to an air cylinder for lobe pulling suspended from the rope car support 23. 26 via a cylinder rod 31. Note that the other end of the rope 25 is connected to a slider 29, which will be described later.

Further, as shown in FIG. 1, a slide body 30 having a 0-shape in side view is fixed on the moving table 19, and this slide body 30 is provided with two guide bars 27 and 27 in the X direction. It is being This guide bar 27 passes through the slider 29. On the upper surface of this slider 29 is a container sandwiching plate 28.
is fixed. Further, a compression spring 33 is provided between the bent piece of the slide body 30 and the slider 29,
Due to the elasticity of the compression spring 33, the slider 29 is constantly pushed outward with respect to the slide body 30.

Further, one end of each of the two ropes 25 is connected to a bracket 29a provided on the slider 29. Note that the row 125 passes through the container sandwiching plate 28.

Therefore, by sandwiching the container 14 between the container sandwiching plates 26, 26,
To align the air nipper blade 16 in the X direction, the rope pulling air cylinder 26 is operated. As a result, the left and right lobes 25.25 are pulled against the elasticity of the compression spring 33, and the left and right sliders 29.29 are drawn toward the center by an equal length. Therefore, as a result, the container clamps 26, 26 on this slider 29 sandwich both sides of the container 14.

Here, the gate 15 protruding into the container 14 is
Originally, it is located at the center of the container 14, equidistant from both sides of the container 14, and the cutting position of the air nipper blade 16 is arranged at an equal interval from the container sandwiching plates 28, 28 on both sides. 15 can be cut accurately, but in reality, the inner bottom of the container 14 is held by suction by the vacuum pad 57, so the suction position is not exactly a constant position, so each cut is There is a slight displacement in the position of the container 14. That is, the position of the gate 15 of the container 14 and the air nipper are adjusted by 8 dimensions shown in the first figure.
This causes a deviation in the cutting position of the blade portion 16. In such a case, the pinching action of the container 14 on both sides of the container 14 by the container sandwiching plate 28 breaks the equilibrium force of the pair of tension springs 22, 22, and automatically moves the moving platform 19 in the X direction by the amount of deviation a. It will be moved to. Therefore, the position of the gate 15 and the cutting position of the air nipper blade portion 16 are automatically corrected, and accurate alignment can be achieved. Note that the pinching force acting on the container pinching plate 28 by the rope pulling air cylinder 26 is designed to be larger than the equilibrium force of the tension spring 22.

In addition, alignment in the Y direction between the cutting position of the air nipper blade part 16 and the gate 15 does not require much dimensional accuracy because the blade surface of the air nipper blade part 16 is long, but just in case, it is necessary to use the gate cut carriage. 10 in the Y direction, the stopper 34 is adjusted using an adjustment knob 35.

That is, mainly in FIG. 1, FIG. 2, and FIG.
36a (see Figures 2 and 4). Two guide bars 38, 38 slidably pass through this mount 36. The lower ends of these guide bars 38, 38 are connected and integrated by a lower connecting plate 39. Further, the upper ends of these guide bars 38, 38 are fixed to and integrated with the lifting platform 37, respectively. Therefore, this elevating table 37 slides up and down with respect to the mounting table 36 via the guide bar 38. Also, the side part of this mounting base 36 (the first
A trunnion type air cylinder 41 is mounted on the left side in the figure via a bearing block 40. Further, the cylinder rod 44 of the trunnion type air cylinder 41 is connected to the side part of the lifting platform 37 (on the left side in FIG. 1) via a bracket 42 and a Y-shaped fitting 43 (see FIG. 4). . Therefore, the elevating table 37 rises due to the extension operation of the trunnion type air cylinder 41, and the pressing box 56, which will be described later and which is fixed on the elevating table 37, comes into contact with the bottom of the container 14, and the air nipper blade 16 moves in the X direction. It is now possible to align the

[Structure of Air Nipper Blade 16] The air nipper blade 16 faces the bottom of the container 14 at an angle, and is configured to cut the gate 15 by sandwiching it between a pair of nipper blades 55 and 55. That is, the lifting platform 3
7 has an inverted gate-shaped bracket 45 on its slanted front side (on the near side in Figure 1) 45a.

45a. This reverse gate type bracket 4
A swivel base 46 is installed inside the 5, and a miniature bearing 47.
47, and is rotatably assembled. That is, projecting pins 47a, 47a are projected upward and downward from the swivel base 46, respectively, and the miniature bearing 47 is fitted onto these projecting pins 47a so as to rotate. Further, an air cylinder 4B is attached to the lower side of the swivel base 46 in FIG. 2, and a tool rest 49 is attached to the upper side. Therefore, the air cylinder 4 and the tool rest 49, together with the swivel base 46, are designed to rotate relative to the inverted gate-shaped bracket 45 around the miniature bearing 47.

Pins 37a, 37a provided on both sides of the tip of this tool rest 49 and on the lifting platform 37 (see FIGS. 4 and 5)
A pair of tension springs 50.50 are tensioned between the two. Therefore, this rotatable tool rest 49 has this tension spring 50
．． 50, it is pulled on both sides and is in an equilibrium state.

Further, the rod 51 of the air cylinder 48 is connected to a pair of nipper blades 55,55 via a clevis 52 and a forked arm 53 (see FIGS. 2 and 5). This nipper blade 55 is attached to a support shaft 5 attached to the tool rest 49.
It can be opened and closed around 4.

Therefore, when the air cylinder 48 is operated, the nipper is
The blade 55 is closed and the gate 15 protruding into the container 14 is cut.

Here, a minute misalignment between the nipper blade 55 and the gate 15 in the X direction (due to manufacturing errors in the air nipper blade 16, etc.) is caused by the tool rest 49 being pulled by the tension springs 50 from both sides. Since the state is in equilibrium and the swivel table 46 is rotatable via the miniature bearing 47, if the blade surface of either of the pair of nipper blades 55, 55 comes into contact with the gate 15, Due to the contact reaction force, the nipper blade 55 self-swivels around the miniature bearing 47 and automatically performs centering operation (positioning).

[Severed gate collecting device]

A pressing box 56 surrounds the nipper blade 55 and a lifting platform 37
is fixed to the top surface of. Therefore, when the trunnion type air cylinder 41 is activated and the lifting platform 37 is raised,
The upper end of this pressing box 56 comes into contact with the edge ring 14a of the container 14 and pushes up the container 14 (note that the vacuum pad 57 that holds the container 14 is designed to expand and contract up and down with a spring 58). ), Therefore, as described above, the air nipper blade 16 can be aligned in the X direction with respect to the container 14.

A rectangular tunnel 60 is obliquely bored in the lifting table 37 at a corresponding location of the lower opening of the pressing box 56, and an inclined chute 61 is connected to this tunnel 60. It's coming up above. This swarf box 6
2 is of a cassette type and is detachable with a screw 62a.

[Operation of gate cut device]

The gate cut device A of this embodiment has the above-mentioned configuration and performs the following general operations. That is, the container 14 taken out from the core of an appropriate injection molding machine,
It is transported to a predetermined location by a take-out transport machine (not shown), and the gate cut device MA of this embodiment is attached to this take-out transport machine. That is, the inner bottom of the container 14 that has fallen from the core is held by suction by the vacuum pad 57. Therefore, the gate 15 protruding from the bottom surface of the container 14 is directed downward. The gate cut group mA is aligned in the X direction with respect to the gate 15 by bringing the gate cut carriage 10 into contact with the stopper 34 by the operation of a pair of cylinders 11°11 on both sides.

Further, alignment of the gate 15 to the gate cutting device in the X direction is performed by operating the rope pulling air cylinder 26. In other words, the left and right rows 125 are pulled against the elasticity of the compression spring 33, and the left and right sliders 29 are pulled toward the center, and the container sandwiching plates 26 sandwich both sides of the container 14, so that the container 14 The gate 15 protruding from the center of the bottom back surface and the air nipper blade portion 16 are aligned in the X direction.

Therefore, a pair of nipper blades 5 are inserted with the gate 15 inside.
5.55 can be aligned in the X and X directions. Next, the elevating table 37 is raised by the extension operation of the trunnion type air cylinder 41, and the pressing box 56 comes into contact with the bottom of the container 14.
Alignment in the Z direction is performed.

Therefore, when the air cylinder 45 of the air nipper blade section 16 is operated, the pair of nipper blades 55,55 close and cut the gate 15. The cut gate 15 is guided by the pressing box 56 and falls through the tunnel 60, and the sloped shoe) 61
The chips fall through the chip box 62 and are collected.

When the cutting of the gate 15 is completed, each part returns to its original position in the reverse order of the above.

Note that these cooperative operations are performed over time by limit switches and a timer of a sequencer (none of which are shown) provided at the upper and lower ends of each air cylinder.

Here, if there is an error in machine manufacturing of the air nipper blades 16 or the like, or if the gate 15 does not protrude from the center of the bottom surface of the container 14, the gate 15 may not be positioned between the opposing nipper blades 55, 55. In such a case, when the nipper blades 55 are closed, one of the nipper blades 55 having a relatively long blade surface will be biased toward the gate 15, so that the nipper blades 55 will self-align due to the contact reaction force. It rotates and is automatically aligned in the X direction.

Although the case where the gate cutting device A of this embodiment is attached to a take-out machine has been described, the present invention is not limited to this, and the present invention is not limited to this.
The gate may be held by a vacuum pad and cut by the gate cutting device of this embodiment. That is, a strip belt may be provided between the pair of container sandwiching plates 28, 28 so as to run in a direction perpendicular to the sandwiching direction.

〔Effect of the invention〕

According to the present invention, the tool rest provided with a pair of nipper blades is
It is rotatably attached to the base that moves toward and away from the gate, and since both sides of the air nipper blade side of this tool rest are tensioned to this base with a pair of tension springs, the nipper Even if there is a misalignment between the nipper blades and the gate due to manufacturing errors in the assembly of the blades or molding errors in the core, if one of the nipper blades comes into contact with the gate, it will self-swivel and align itself, allowing the nipper to cut. Can be cut well without affecting functionality. Therefore, for example, the blade does not spill.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a front view of an embodiment of the present invention.
L-3l' cross-sectional view, Figure 3 is a cross-sectional view from 52 to S2 in Figure 2, Figure 4 is a view from S3 to S3' in Figure 2, and Figure 5 is a view from 34 to S4 in Figure 2. ' Shows an arrow view. 14... Container, 15... Gate, 16... Air nipper blade section, 37... Lifting platform, 49... Tool rest, 5
0...Tension spring, 54...Support shaft, 55...Nipper blade, A...Gate cutting device. Agent Patent Attorney Yoshihiko Okabe

Claims (1)

[Claims] (1) In a gate cutting device equipped with an air nipper consisting of a pair of nipper blades for cutting a gate protruding from the end surface of a plastic molded product, the pair of air nipper blades are pivotably supported to open and close. a support shaft; a tool rest on which the support shaft is erected; a base on which the tool rest is rotatable and moves toward and away from the gate; both sides of the nipper blade side of the tool rest and the base. A gate cutting device for plastic molded products consisting of a pair of tension springs that tension the and.