JP6534170B2 - Nipper equipment - Google Patents

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a nipper apparatus for cutting various types of workpieces such as resin molded products, molded products such as die cast, and electric wires.

  For example, as a gate cutting nipper for cutting a resin-molded molded article into a product and a runner sprue at the gate section, a pneumatic nipper for cutting by closing the nipper blade with an air cylinder or a motorized motor closes the nipper blade. An electric motor type nipper that operates and cuts is used.

However, in the above-described pneumatic nippers, the nipper blade can only be closed at a constant torque according to the compressed air pressure supplied, and a high pressure is required to cut a large work or a hard work. It is necessary to use pneumatic equipment compatible with compressed air and high pressure, and the apparatus itself has a problem of upsizing and weight increase.

  Further, in the electric motor type nipper, for example, as shown in Patent Document 1, it is stretched between a pair of pivoting bodies having a blade at the tip and fixed to a housing of an intermediate portion and pivoting around each other. The nipper main body having the spring is inserted into the base end of the rotating body and is opened and closed by a cam rotated by an electric motor so as to be cutable.

Even in this electric motor type nipper, in order to cut the work by closing the nipper blade with a constant torque corresponding to the current or voltage applied to the electric motor, it is high to cut a large work or a hard work. It is necessary to use a torque electric motor, and the device itself has the problem of upsizing and weight increase.

In particular, in the electric motor type nipper shown in Patent Document 1, when the eccentric cam is rotated by the electric motor to close the nipper blade, the eccentric cam must be rotationally driven with high torque, and high torque It was necessary to use an electric motor.

Japanese Utility Model Application Publication No. 4-14050

  The problem to be solved is that, with a pneumatic nipper or an electric motor nipper, the nipper blade can only be closed with a constant torque, and it is expensive when cutting large or hard workpieces. It is necessary to use compressed air under pressure, pneumatic equipment, and an electric motor with high torque, and the point is that the apparatus itself becomes large and heavy.

The present invention has a blade body on one side and a handle having an appropriate length on the other side with respect to the main body, and the central portion is pivotally supported in a state where the blade body protrudes outside the body, the blade A pair of nipper main bodies which can be opened and closed mutually, an elastic member which biases the pair of nipper main bodies in a direction in which the blades mutually open, and an outer surface of a corresponding handle with a length longer than each handle. Extending in the longitudinal direction of the cam lever with respect to the main body, and a pair of cam levers pivotally supported by the main body at a location corresponding to the pivot point of each nipper main body. A movable body supported, a moving means for moving the movable body in the longitudinal direction, and a space capable of contacting the outer surface on the proximal end side of each cam lever with respect to the movable body are provided. this contacting over the free end side outer surface of each cam lever from the base end with the movement of It includes a pair of cam followers for rotating each cam lever, the result, each cam follower by the movement of the moving body by the moving means, by sliding contact over the free end side from the proximal end of the corresponding cam lever outer surface Depending on the length of the cam lever relative to the handle when turning the handle of each nipper body against the elastic force of the elastic members in the direction to approach each other to close the blades and allow the work to be cut. while allowing energizing the cutting force by the blade cross Te, each cam follower by the movement of the moving body due to the backward movement of the moving means causes sliding over the free end of the corresponding cam lever outer side to the base end Thus, the handle of each nipper main body is pivoted in the direction of being separated from each other by the elastic force of the elastic member to make the blades open.

  The present invention can cut a work with a force equal to or greater than a set torque, and can miniaturize and lighten the apparatus itself.

It is a perspective view showing the inside of a nipper device. It is a top view of a nipper device. It is an explanatory view showing an operation state of a nipper device. It is explanatory drawing which shows the modification Example of a nipper apparatus. It is explanatory drawing which shows the modification Example of a nipper apparatus.

Against each cam follower by the movement of the moving body by the moving means, the shank of the nipper body by sliding over the free end side from the proximal end of the corresponding cam lever outer surface the elastic force of the elastic member When turning the blades close to each other and closing the blades mutually to make it possible to cut the work, the cutting force by the blades can be increased according to the length of the cam lever to the handle , while the movement is made each cam follower by the movement of the moving body by backward movement means, by the elastic force of the corresponding cam lever outer surface each nipper body by sliding over the base end side from the free end of the handle portion of the elastic member It is an optimal embodiment to rotate the blades in a direction away from each other to open the blades.

Hereinafter, an embodiment in which the nipper device of the present invention is implemented as a servomotor-driven electric motor type nipper device will be described.
As shown in FIGS. 1 and 2, an opening 5 is formed on one side (the left side in the figure) of the main body 3 of the electric motor type nipper apparatus 1, and the main body 3 corresponding to the opening 5 has a pair of nipper main bodies. 7 is pivotally supported so that it intersects at the central portion and pivots about an axis 9.

In each nipper main body 7, the blade 7a is provided opposite to the lower end side shown in FIG. 2 and the handle 7b is integrally provided on the upper end shown in FIG. 2. Each blade 7a is formed by opening and closing the handle 7b. It is pivoted between adjacent and spaced apart positions.

An elastic member 11 such as a compression spring is provided between the handle portions 7b of each nipper main body 7, and each nipper main body 7 is urged in a direction in which the handle portions 7b are separated from each other by the elastic force of the elastic members 11 It is rotated so as to open the respective blade 7a each other by becoming a c-shape.

The main body 3 corresponding to both sides of the shaft 9 for axially supporting each nipper main body 7 extends along the outer surface of the handle 7b and is longer than the handle 7b (e.g. The proximal end of the cam lever 13 is pivotally supported to pivot about the shaft 15 (5 to 2 times the length).

A movable body 17 is attached to the main body 3 so as to reciprocate in the vertical direction shown in FIG . On the left and right sides of the movable body 17 shown in FIG. 2, rollers 19 that roll along the inner surfaces of the left and right side plates of the main body 3 shown in FIG.

The lower left and right end side shown in FIG. 2 of the moving body 17, so that the pair of rollers cam Huo lower 21 shown in FIG. 2 rolls in contact with the outer surface of the cam lever 13 in areas of the shaft part 9 nearer Supported by

At an upper central portion of the main body 3 shown in FIG. 2, a numerically controllable servomotor 23 which constitutes a moving means is provided. The servo motor 23 has a hollow portion (not shown) extending in the axial direction at the center of a rotor (not shown) and a female screw (not shown) formed on the inner circumferential surface of the hollow portion. It has a hollow rotor structure.

The servo motor 23 is also provided with a detector 23a such as a rotor encoder, and the controller (control means, not shown) controls the feed screw 25 according to the rotational position of the rotor based on the signal from the detector 23a. The movement torque and the like of the feed screw 23 are detected from the movement amount and the current value applied to the servomotor 23.

  In the hollow portion of the rotor in the servomotor 23, a male screw is wound on the outer peripheral surface, and a feed screw 25 having an axial length corresponding to the movement distance of the movable body 17 is engaged with the female screw and protrudes into the main body 3. The axial end of the feed screw 25 is fixed to the illustrated right side surface of the movable body 17.

Next, the cutting operation of the work by the electric motor type nipper device 1 configured as described above will be described.
First, to describe the state at the time of non-cutting, at the time of non-cutting of the workpiece, the moving body 17 by the feed screw 25 to move by the driving of the servo motor 23 to the solid arrow direction shown in FIG. 2 to the lower side shown in FIG. 2 It has been moved.
The work may be any of a resin molded article immediately after resin molding, a die cast, a metal wire such as an electric wire, and the like.

In this state, each roller cam follower 21 is positioned to abut the outer surface of the cam lever 13 according to the shaft 9 of the handle 7b whose distance is reduced from each other, and the handle 7b and the cam lever 13 are elastic members. The elastic force of 11 makes it open in the form of a square C-shape in which the distance between the free ends increases.

As a result, the blade bodies 7a of the nipper main bodies 7 are separated from each other, and a space for inserting the cutting point of the work is formed.

Next, after the cutting position of the work is positioned in the space between the blades 7a in the above state, the servomotor 23 is driven to control the feed screw 25 to move in the direction of the solid arrow shown in FIG. The moving body 17 is moved upward as shown in FIG.

At the time of movement of the movable body 17, the mutual distance between the roller cam followers 21 is set constant, so that the cam lever 13 rolls upward from the lower side shown in FIG. 3 with respect to the outer surface of the cam lever 13. the gradually closing operation the blade 7a mutually by rotating the direction of the respective nipper body 7 shank 7b mutually closer by pressing as mutual spacing of the upper shown in FIG. 3 is gradually reduced Cut the work cutting point.

When cutting the workpiece, the cam lever 13 is long relative to the handle 7b, and the free end of the cam lever 13 is pressed to close the blade 7a, so that the free end of the handle 7b is pressed to A large cutting force can be obtained with a small force as compared to the case of closing operation.

As a result, the servomotor 23 with small torque can be used as a drive source for moving the movable body 17, and the apparatus itself can be miniaturized and reduced in weight.

Further, when cutting the work by setting the drive source for closing the cam lever 17 to the servomotor 23, a plurality of cutting points are set between the cutting start and the cutting completion, for example, the next cutting after the cutting start Up to the point, the cutting torque can be increased while increasing the cutting speed, and the torque control, speed control and position control can be performed so that the cutting torque is gradually decreased to the next cutting point and the immediate cutting speed is decreased. The workpiece can be cut with high quality so as to be a smooth cut surface.

In this embodiment, by using the servomotor 23 as a drive source for closing the nipper main body 7, the cutting torque control, speed control and cutting position control of the blade 7a make the cutting surface of the workpiece smooth in the cutting position. Can be cut to high quality.

Further, even if the handle 7b is a short nipper main body 7, the work can be cut with a large torque by the small torque servomotor 23 by closing operation with the cam lever 13 longer than the handle 7b, and the device itself It is possible to reduce the size and weight.

In the case of cutting the synthetic resin work, for example, in the case of cutting the synthetic resin work in the above description, the cutting surface is provided by providing the blade 7a with an electric heater and heating it to a temperature at which the synthetic resin softens. Can be cut to a high quality so as to be smooth.

The above description is a hollow shaft servomotor in which a female screw is formed on the inner peripheral surface of the rotor, the feed screw 25 whose one end is fixed to the movable body 17 is engaged with the hollow portion of the rotor, and with rotation of the rotor The movable body 17 is moved by moving the feed screw 25, but as shown in FIG. 4, the main body 3 has an axis in the direction coincident with the moving direction of the movable body 17. A feed screw 51 engaged with a provided nut 17a (shown by a broken line in FIG. 5) is rotatably supported by a bearing 55, and an output shaft 53a of a servo motor 53 is drivingly connected to the feed screw 51. The movable body 17 may be moved while performing torque control, speed control, and position control by means of a feed screw 51 that rotates in accordance with the rotational drive of 53.

In the above description, the roller 19 is provided on the movable body 17 and the movement of the movable body 17 is guided in the main body 3, but a linear guide extending in the movement direction of the movable body 17 is provided in the main body 3 The linear guide may be configured to support the moving body so as to move in the longitudinal direction.

  Although the above description has described the nipper apparatus using the servomotor 23 as the moving means, the moving means may be constituted by the hydraulic or pneumatic cylinder 61 as shown in FIG.

  When the moving means is the cylinder 61, the rod 61a of the cylinder 61 is attached to the moving body 17, and the moving body 17 is moved according to the expansion and contraction of the rod 61a accompanying the operation of the cylinder 61. 7a can be closed by a torque corresponding to the length ratio of the cam lever 13 to the handle 7b to cut the work.

In the case where the moving means is the cylinder 61, unlike the case where it is constituted by the servomotor 23, the cutting torque can not be varied as the cutting progresses, but high cutting is carried out using a low pressure compressed fluid. Torque can be obtained, and the device itself can be miniaturized and reduced in weight.
The same members as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

Reference Signs List 1 electric motor type nipper device 3 main body 5 opening 7 nipper main body 7a blade 7b handle 9 shaft 11 elastic member 13 cam lever 15 shaft 17 moving body 17a nut 19 roller 21 roller cam follower 23 servo motor 23a as moving means detector 25 Feed screw 51 Feed screw 53 Servo motor 53a Output shaft 55 Bearing 61 Cylinder 61a as moving means Rod

Claims (9)

The body has a blade on one side and a handle of an appropriate length on the other, and the central portion is pivotally supported in a state where the blade protrudes to the outside of the body, and the blades mutually open and close Possible pair of nipper body,
An elastic member for urging the pair of nipper main bodies in a direction in which the blades mutually open;
Extending along the outer surface of the corresponding handle with a longer length than each handle, and a pair of base ends pivotally supported by the main body at a location corresponding to the pivot point of each nipper main body With the cam lever,
A movable body movably supported in the longitudinal direction of the cam lever with respect to the main body;
Moving means for moving the moving body in the longitudinal direction;
The movable body is provided with an interval allowing contact with the outer surface on the proximal end side of each cam lever, and along the movement of the movable body, the outer surface of each cam lever is moved from the proximal end to the free end A pair of cam followers that rotate the respective cam levers by abutting across each other ;
Equipped with
Against each cam follower by the movement of the moving body by the moving means, the shank of the nipper body by sliding over the free end side from the proximal end of the corresponding cam lever outer surface the elastic force of the elastic member When turning the blades close to each other and closing the blades mutually to make it possible to cut the work, the cutting force by the blades can be increased according to the length of the cam lever to the handle , while the movement is made each cam follower by the movement of the moving body by backward movement means, by the elastic force of the corresponding cam lever outer surface each nipper body by sliding over the base end side from the free end of the handle portion of the elastic member A nipper device which pivots in a direction away from each other to open the blades. In claim 1,
A moving means is a servomotor capable of numerically controlling torque and rotational speed, and moves the moving body in accordance with driving of the servomotor. In claim 2,
The servomotor is a hollow rotor type in which an internal thread is formed on the inner peripheral surface of the central portion of the rotor, and an end of a feed screw having a male screw engaged with the internal thread of the rotor is attached to a moving body to drive the servomotor. A nipper device in which a movable body can be moved by a feed screw moved by a rotor that rotates accordingly. In claim 2,
The servomotor has an axis in the moving direction of the movable body and is rotatably supported by the main body, and a part is drive-connected to a feed screw that meshes with a nut provided on the movable body, and along with the drive of the servomotor A nipper device that enables the movable body to move back and forth by means of a feed screw that rotates. In any one of claims 2 to 4,
A nipper device in which a plurality of cutting points are set between the start of cutting and the completion of cutting of the workpiece, and torque control of the servomotor is made for each cutting point to make the cutting torque of the workpiece variable. In any one of claims 2 to 5,
A nipper system in which multiple cutting points are set between the start of cutting and the completion of cutting of the workpiece, and the speed of the servomotor can be controlled for each cutting point to make the cutting speed of the workpiece variable. In claim 1,
The moving means is a nipper device wherein the rod is a fluid pressure cylinder attached to the moving body. In any one of claims 1 to 7,
Cam follower, nippers apparatus with roller cam follower that rolls in contact with the outer side surface of each cam lever. In any one of claims 1 to 7,
Cam follower, nippers apparatus with sliding contact cam follower on the outer side surface of each cam lever.

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