JPH0225324B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an air nipper that is attached to, for example, an automatic molded product take-out device and performs gate processing on molded products.

Conventional technology Conventionally, air nippers used for gate processing to separate the molded product taken out from the molding machine into a product part and a runner or sprue have been used, for example, in the 1970s.
As shown in Publication No. 11969, guide plates attached to the rods of the upper and lower cylinders are fixed to brackets that are rotatably supported on the molded product removal machine.
A resection cylinder is attached, one end of a pair of rotatably supported blades is brought into contact with a stenosis link attached to the rod of the resection cylinder, and the blades are moved by the operation of the upper and lower cylinders. BACKGROUND OF THE INVENTION Cutting devices are generally known which, when moved into position on a molded part, actuate a cutting cylinder to move a constriction link, thereby activating the blade to close and sever the sprue of the molded part.

However, in the case of the cutting device having the structure described above, the blade opened by the operation of the upper and lower cylinders is
When located on the sprue of a molded product, the cutting cylinder is actuated to drive the blade closed, and the blade is pressed against the product part of the molded product and the sprue or runner, making it impossible to cut. For this reason, an uncut portion remains at the gate of the product section, and this uncut portion must be cut and removed in a later process, resulting in extremely poor work efficiency. In addition, in the case of the resection device having the above structure, it is necessary to attach many parts such as the resection cylinder, the stenosis link, and the guide for holding the link to the rod tips of the upper and lower cylinders. are becoming heavier and larger. As a result, it is difficult to insert the blade into the narrow mold space, and the blade vibrates greatly when the blade stops moving downward, resulting in poor positioning accuracy with respect to the molded product. Another problem is that it is not possible to proceed to post-cutting operations until the vibrations have subsided, resulting in a longer cutting time.

Purpose This invention was invented to solve the above-mentioned conventional drawbacks, and its purpose is to securely connect the product part of a molded product and the runner or sprue to the gate part that is the boundary between them. To provide an air nipper used for gate processing of a molded product, capable of simplifying and increasing efficiency of processing work of the molded product by reducing uncut parts.

Example The present invention will be described below with reference to Examples.

FIG. 1 is a front view of the air nipper according to the present invention;
2 is a plan view of FIG. 1, FIG. 3 is a bottom view of FIG. 1, and FIG. 4 is a cross-sectional view taken along the line of FIG. 1. The first cylinder part 2 is extrusion-molded or die-cast hollow and has a first cylinder block 4 made of aluminum, and a cylinder wall of the cylinder block 4 that slides. A first piston made of synthetic resin is movably mounted and has an operating groove 5 as a cam portion with a tapered surface that is successively narrowed in order to perform a clamping operation on a nipper blade body to be described later. An elastic member 8, such as a coil spring, is interposed between the piston 6, the left side plate 7 attached to the left side of the cylinder block 4, and the piston 6, and is used to urge the piston 6 to the right. 3
As shown in the figure, there are plan views 9c and 9d on the right side,
In addition, L-shaped operating levers 10a and 10b have a single-edged structure in which blades 9a and 9b are formed on the left side, and the lower right end thereof constitutes an operating section that is engaged with the operating groove 5. The integral nipper blade bodies 11a and 11b are rotatably supported by a pin 12, and are connected to the cylinder block 4 via the left side plate 7.
It consists of a Nitzpa case 13 screwed onto the Nitzpa case 13.

In the figure, reference numeral 14 is below the pin 12 and is interposed between the nipper blade bodies 11a and 11b.
A coil spring 15 serving as an elastic member for urging the blades 9a and 9b of the blades 1a and 11b to open is formed in the center of the left side plate 7, and is connected to the operating levers 10a and 11b.
an insertion hole for inserting 10b into the piston 6 side;
16 is an airtight material attached to a step formed on the outer periphery of the piston 6.

The second cylinder part 3 includes an airtight material 17 for closing the right side of the cylinder block 4, and a closing plate 1.
A second cylinder block 19 made of hollow die-cast aluminum is attached to the cylinder block 4 via the cylinder block 8, and a second piston is slidably attached to the cylinder wall of the second cylinder block 19. An actuating body 20 in which a pressurized air inflow nozzle 20c and an inflow passage 20d are integrally formed in a portion 20a and a rod portion 20b, and the piston portion 2
0a to the right in FIG.
8 and a second elastic member 21 such as a coil spring interposed between the piston portion 20a and the piston portion 20a. The pressurized air inflow nozzle 22 for the first cylinder section 2 is screwed onto the second cylinder block 19, and holes 23 are formed in the second cylinder block 19, the closing plate 18, and the airtight material 17 corresponding to the locations.
a, 23b, and 23c are formed. Further, numeral 24 in the figure is an airtight material attached to the outer circumferential stepped portion of the piston portion 20a.

Elongated holes 26a and 26b are provided on the left side of the bracket 25.
is formed, and the first
A bracket 25 is movably screwed onto the cylinder block 4, and a rod portion 20b is mounted on the right side.
A hole 28 is formed which can engage with a locking step 27 formed in the bracket 25, and a stop ring 29 attaches the bracket 25 to the rod portion 20b. still,
In the figure, 30 is a mounting plate for the air nipper 1.

Next, the operation of this embodiment will be explained with reference to a cross-sectional view (FIG. 5) showing the operating state and an explanatory diagram (FIG. 6) showing the gate processing state.

The second air nipper 1 fixed to the mounting plate 30
When pressurized air such as air flows into the first airtight chamber 31 through the inflow passage 20d from the air inlet nozzle 20c into the cylinder portion 3, the air PF ₁ flows toward the right side of the right end wall of the second cylinder block 19 in the drawing. Press.
In accordance with this pressing force, the first cylinder block 4 moves to the right along the longitudinal direction of the elongated hole 26b and is located at the position shown in FIG.

Next, when the pressurized air PF ₂ flows into the second airtight chamber 32 through the pressurized air inflow nozzle 22 at the position, the pressurized air PF ₂ moves the piston 6 to the left in the figure.

As the actuating levers 10a and 10b move to the left, the right end portions of the actuating levers 10a and 10b slide on the tapered surface of the actuating groove 5 and approach each other against the elastic force of the coil spring 14.

As the operating levers 10a, 10b move, the nipper blades 11a, 11b are clamped, and the blades 9a, 9b perform cutting operations.

The case where a molded product is subjected to gate processing according to the above operation will be explained in more detail.

Molded product 33 taken out from a molding machine (not shown)
The sprue portion is located between the blades 9a and 9b.

When the second cylinder part 3 is operated in this state, the flat surfaces 9c and 9d of the nipper blades 11a and 11b
pushes the product part 33a to the right in FIG. 6, and the blades 9a and 9b are positioned at the boundary between the sprue part 33b and the product part 33a, that is, the gate part 33c.

In the above state, the nipper blades 11a and 11b are clamped, and the molded product is gated in a state where the cut surface at the gate portion 33c substantially coincides with the planes 9c and 9d.

Therefore, the air nipper of this embodiment has the following features.

(1) When installing the air nipper, the nipper blades 11a and 11b are located at the gate even if the air nipper is installed at a position slightly away from the gate of the molded product, which simplifies the installation work of the air nipper. ,
Work efficiency can be improved.

(2) In relation to the above characteristics, the nippa blade body 11 is always
Since the gate processing of the molded product can be performed at the gate part with a and 11b pressed against the product part,
The gated product part can be used as a product without going through a finishing process. Therefore, it can contribute to efficiency and labor saving of the molding operation itself.

(3) Since the blades 9a and 9b themselves have a single-edged structure, and a flat surface is formed on the other surface, gate processing can be performed with the positioning location relative to the gate portion aligned with the flat surface. Therefore, it is characterized by extremely high gate processing accuracy.

The above description is based on the first and second cylinder parts 2 and 3.
and installed so that they are in the same axial direction,
Although the nipper blades 11a and 11b are provided with L-shaped actuation levers 10a and 10b so as to slide in the actuation groove 5, the above-mentioned For example, the second cylinder section 3 and the first cylinder section 2 may be attached so that their axes are perpendicular to each other. In this case, L-shaped operating levers 10a, 1 are attached to the nipper blades 11a, 11b.
The nipper blade bodies 11a, 1 without providing 0b.
The other end of 1b may be brought into sliding contact with a cam of a piston to open and close the nipper blades 11a and 11b. In addition, the above explanation assumes that the operating groove 5, which gradually becomes narrower, is directed toward the piston 6, as shown in FIG. However, the cam portion of the present invention is not limited to the above-described shape, and may be any cam portion as long as it opens and closes the nipper blade in accordance with the reciprocating movement of the first piston.

Effects As explained above, the present invention is provided with a cutter part for cutting the gate part of the molded product at one end, and
A pair of nipper blades with an operating part on the other end,
A nipper part supported so as to rotate between a position where the blade parts are separated from each other and a position where the blade parts are in contact with each other, and the pair of nipper blade bodies are biased so that the respective blade parts are separated from each other. and an elastic member that is movably supported in the axial direction within the first cylinder block, and the width between the cam surfaces in sliding contact with the operating portion of each nipper blade changes from the end to the intermediate portion. and a first piston having a first piston provided with a cam portion that rotates the nipper blades so that the blade portions come into contact with each other as the nipper blades move in the axial direction.
a second cylinder in which a second piston provided with a rod is movably supported in the axial direction in a second cylinder block attached to the first cylinder part; Of the first and second cylinder parts, at least the first cylinder part is supported so as to be movable in the axial direction of the second cylinder part, and a bracket is attached to which the rod of the second piston is attached. When gate processing a molded product in which the product part and the runner part are integrally molded, the nipper blade is positioned at the gate part, which is the boundary between the product part and the runner part, as the second cylinder part operates. After the nipper blade is rotated by the operation of the first cylinder part, the product part can be cut at the gate part, and the uncut portion of the product part can be reduced. can. Therefore, it is an air nipper that can simplify and improve the efficiency of processing work for molded products.

[Brief explanation of drawings]

FIG. 1 is a front view of the air nipper according to the present invention;
2 is a plan view of FIG. 1, FIG. 3 is a bottom view of FIG. 1, FIG. 4 is a sectional view taken along the line of FIG. In the figure, 1 is an air nipper, 2 is a first cylinder part, 3 is a position changing member, 4 is a cylinder block (first), 5 is an operating groove, 6 is a piston, 7 is a left side plate, 8 is an elastic member, 9a, 9b are blades, 9c, 9d
10a, 10b are operating levers, 11
a, 11b are nipper blade bodies, 12 is a pin, 13 is a nipper case, 14 is a coil spring, 15 is an insertion hole, 16 is an airtight material, 17 is an airtight material, 18 is a closing plate, 19 is a second cylinder block, 20a 20b is a piston portion, 20b is a rod portion, 20c is a pressurized air inflow nozzle, 20d is an inflow passage, 21 is a second elastic member, 22 is a pressurized air inflow nozzle, 23a, 23b, 2
3c is a hole, 24 is an airtight material, 25 is a bracket, 2
6a, 26b are long holes, 27 is a locking step, 28 is a hole, 29 is a stop ring, 30 is a mounting plate, 31
32 is a first airtight chamber, 33 is a molded product, 33a is a product part, 33b is a sprue part, 33
c is a gate section.

Claims (1)

[Scope of Claims] 1. A pair of nipper blades each having a blade portion for cutting the gate portion of a molded product at one end and an operating portion at the other end are arranged at a position where the blade portions are separated from each other. a nipper part supported so as to rotate between the abutting positions; an elastic member that biases the pair of nipper blades so that the respective blade parts are separated from each other; and a first cylinder block. The cam surfaces are supported to be movable in the axial direction, and the distance between the cam surfaces on which the operating portion of each nipper blade slides changes from the end to the middle portion, and as the nipper blade moves in the axial direction, a first cylinder portion having a first piston provided with a cam portion that rotates the nipper blades so that the blade portions come into contact with each other; and a second cylinder attached to the first cylinder portion. a second cylinder in which a second piston provided with a rod is supported so as to be movable in the axial direction; An air nipper used for gate processing of a molded product, comprising: a bracket supported movably in the axial direction of a second cylinder part and to which a rod of the second piston is attached; .