JP3501596B2 - Wire stripper - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire stripper for automatically stripping an end of a coating material of a wire (electric wire) over a predetermined length. Conventionally, various wire stoppers have been provided for stripping an end portion of a covering material of a wire over a required length to expose a core wire and providing the wire for wiring. In this type of wire stripper, generally, after inserting the end of a coated wire into a machine, the end is gripped from both sides by a gripper, and is also sandwiched between both sides of a cutting position of a coating material by a cutting tool. After cutting only the material, the blade is pulled to peel off the coating material at the end of the wire. The opening and closing operation of the blade and gripper in the above-mentioned conventional wire stripper is performed by reciprocating the blade and the gripper opening / closing operating rod using an air cylinder (or a hydraulic cylinder), or using an electric motor. This is done by operating the blade and the gripper opening / closing cam. However, in the former case using an air cylinder or a hydraulic cylinder, a compressor and a hydraulic unit are indispensable in addition to the wire stripper. In addition to the above, there are problems that the use place is extremely restricted, and that the compressor emits a loud exhaust noise and that the moisture contained in the air adversely affects the mechanism. In the case of using the latter cam, since the rotation of the motor must be greatly reduced and transmitted to the cam, large parts such as a large reduction gear and a coupling are required, and a wire stripper is required. However, there have been problems such as an increase in size and an increase in cost. According to the present invention, a normal forward / reverse (reversible) motor is used as a drive source, and a covering material having a highly accurate length range can be automatically peeled off. It has been made to provide an inexpensive wire stripper, and includes a gripper that grips a coating material at an end of a coated wire at a predetermined length position, and a blade that sandwiches and cuts the coating material at a position immediately after the gripper. In a wire stripper, which pulls the blade in the state of holding the coating material and peels the coating material from the core wire, the wire stripper is slidably supported in the machine frame in the front-rear direction, and performs the gripping operation of the gripper and the cutting operation of the blade. The main shaft is provided with a ball screw shaft portion, and a ball nut member is fitted to the ball screw shaft portion via a ball. Combined, between the spindle and the gripper and blade,
A mechanism including a cam that moves forward and backward with the forward and backward movement of the spindle
The ball screw shaft portion moves forward with respect to the ball nut member by the forward rotation of the main shaft to perform the closing operation of the gripper and the blade, and the gap between the ball nut member and the machine frame is provided.
Through a brake device that applies a load to the retraction of the nut member.
The ball nut member is mounted by the brake device.
Becomes stationary or moves backwards against the load
And so, the cam moves forward with the forward movement of the spindle
An abutment member is provided for abutment, and this abutment member
After the advance of the spindle is stopped, the spindle rotates forward.
The ball nut member is further retracted , and
A connecting member is provided between the nut member and the blade.
Te, clamping the tool in conjunction with the retreat of the ball nut member
It is characterized in that it is pulled while being held . A brake device is provided between the ball nut member and the rear portion of the machine frame to apply a load when the nut member retreats. When the ball nut member retreats, the braking force of the brake device increases the gripping force of the gripper. It can be made to act as a cutting force of the blade. A positioning rod composed of an outer tube and a sensor rod inserted therein is provided slidably in the front-rear direction on the same axis line at the insertion position of the coated wire of the gripper and the blade. Has a stopper for pushing the sensor rod into a predetermined stroke by abutting the insertion end of the covering wire, and has a sensor operating portion at the rear end for operating a motor start sensor fixed to the outer tube. Preferably, the spring is biased so that the stopper is in the forward position with respect to the outer tube. The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 is a longitudinal sectional side view (corresponding to the AA section in FIG. 2) of an embodiment of a wire stripper according to the present invention, and FIG. 2 is a horizontal sectional view thereof. 1 and 2 are referred to as a front portion and the right side is referred to as a rear portion. A main shaft 3 is rotatably and axially slidably supported at a lower position between the side walls 2 at both ends in the longitudinal direction of the machine frame 1. The shafts 4, 4 are also rotatably supported between the side walls 2, 2, and a positioning rod 5 for determining an insertion position of a wire end and obtaining an activation signal above a central position between the sub shafts 4, 4. Is provided. The required length range of the rear end of the main shaft 3 is a spline shaft 6 (may be a key). The spline shaft 6 has an induction motor (single-phase) mounted on the machine frame 1.
Alternatively, a toothed pulley 9 receiving rotation transmission from a normal forward / reverse (reversible) motor 7 (shown in FIG. 3) such as a reversible motor having a cooling means via a timing belt 8 is slidably fitted. The rotation of the motor 7 is transmitted to the main shaft 3. An intermediate portion of the main shaft 3 is a ball screw shaft 10. A ball nut member 11 is fitted to the ball screw shaft 10 via a ball (not shown), and the ball nut member 11 is rotated by rotation of the main shaft 3. It can move forward and backward in the direction. A cone-shaped first conical cam 12 having a small diameter on the front side is coaxially fixed between the spline shaft 6 of the main shaft 3 and the ball screw shaft 10, and the ball nut member 11 is provided.
On the front end side, a cone-shaped second conical cam 13 having a small diameter on the front side is fitted. A compression spring 14 made of a coil spring is provided between the large-diameter portion of the second conical cam 13 and the ball nut member 11. Is interposed. The second conical cam 1
3 is provided with a pin 15 on the side face thereof.
Is engaged with the rotation preventing portion 16 on the machine frame 1 side, thereby preventing the rotation of the second conical cam 13. A positioning member 18 which advances and retreats with a screw by turning a cutting amount adjusting knob 17 for adjusting a cutting amount of the wire coating material is fitted to a front end of the main shaft 3 protruding from the side wall 2 of the machine frame 1. A thrust bearing 19 is provided at the inner end of the positioning member 18 so as to be able to abut on the small diameter end of the second conical cam 13. Pipe-shaped tube shafts 20, 20 are externally fitted to the front ends of the sub shafts 4, 4, and the front ends of the tube shafts 20, 20 are fixed to the ball nut member 11 in a side view. The arm 21 is inserted into and supported by a bearing portion 21 a of the arm 21. Bases of grippers 22, 22 are fixed to front ends of the sub shafts 4, 4 projecting from the tube shafts 20, 20, and grippers 2 are fixed to front ends of the tube shafts 20, 20, respectively.
The bases of the blade holders 23, 23 located behind the blades 2, 22 are fixed, and the blades having a V-shaped blade as shown in FIG. 24, 24 are fixed. An arm 2 is provided near the rear end of the sub shafts 4 and 4.
The upper ends of the arms 5 and 25 are fixed and suspended.
Cam rollers 26, 26 rotatably mounted in a horizontal plane at the lower ends of the first and second conical cams 12 and 25 are pressed by the outer peripheral surface of the first conical cam 12 when the first conical cam 12 moves forward. The countershafts 4 and 4 rotate in directions opposite to each other, and when the first conical cam 12 advances, the gripper 2 rotates.
2 and 22 are rotated in the closing direction and in the opening direction at the time of retreat. On both sides of the second conical cam 13, there are provided swing members 28, 28 (only one is shown in FIG. 1) whose lower ends are pivotally supported on the machine frame 1 by shafts 27, 27. ,
The cam roller 3 on the vertical shaft 29 of the swing member 28
0 comes into contact with the peripheral surface of the second conical cam 13 (see FIG. 5). Rollers 32, 32 rotatably mounted in the horizontal plane on the lower ends of the arms 31, 31 fixed to the tube shafts 20, 20, are provided on the outer surface of the upper end of the swing member 28.
The second conical cam 13 advances and retreats to rotate the tube shafts 20, 20 in opposite directions via the arms 31, 31. When the second conical cam 13 advances, the blade holder 2 is rotated.
3, 23 are rotated in the closing direction and in the opening direction at the time of retreat. The second conical cam 13 has no and this swing during forward because it is prevented from rotating by a pin 15, so that the resulting depth of cut with high accuracy. A brake device 33 is interposed between the ball nut member 11 and the rear side wall 2 of the machine frame 1. The brake device 33 provides resistance when the ball nut member 11 returns (at the time of retreating movement and when the blade is pulled ), and is provided with a horizontal elongated hole 3 of a base 34 fixed to the side wall 2.
The plate 37 on the ball nut member 11 side is connected by a shaft 36 inserted through the shaft 5, and a braking action is given by friction generated by a spring force applied to a shoe 33 a by a spring 36 a via the shaft 36, and the ball nut member 11 is returned. The resistance at the time is converted into the gripping force of the grippers 22 and 22 so that the wire is strongly gripped. The movement timing of the first and second conical cams 12 and 13 is such that when the main shaft 3 rotates forward, the main shaft 3 is advanced by the ball screw shaft 10 while the ball nut member 11 is initially fixed by the brake device 33. Then, the grippers 22 , 22 are closed by the first conical cam 12, and then the blade holders 23, 23 are closed by the advance of the second conical cam 13, so that the second
When the conical cam 13 comes into contact with the thrust bearing 19 and stops moving, the ball nut member 11 retreats against the load of the brake device 33 due to the reaction force, and the brake device 33
The resistance of the grippers 22, 22 is a force in the closing direction of the grippers 22, 22, and the blade holders 23, 23 are retracted by the retreat of the ball nut member 11, and the coating material is removed from the core wire. On the other hand, the positioning rod 5 is connected to the outer tube 38.
And a sensor rod 39 inserted through the outer tube 38. The outer tube 38 is slidably inserted into and supported by bearings 40, 40 of the machine frame 1, and a wire end is provided at the front end of the sensor rod 39. An abutting stopper 41 is fixed, and a fixed sensor 42 (photosensor) is operated at the rear end at the rear end of the outer tube 38 in order to obtain a start signal of the motor 7. The position where the stopper 41 is slightly separated from the front end of the outer tube 38 (0.3 to 0.5 m
m), when the stopper 41 is pushed at the wire end, the rear end of the sensor rod 39 cuts off the sensor 42 and the motor 7 is started. A block 44 is fixed in the middle of the outer tube 38, and a tension spring 45 is stretched between the block 44 and the rear side of the machine frame 1 so that the outer tube 38 is always pulled back. Has been energized. A central portion of a lever 47 is pivotally supported by a shaft 48 on a bearing 46 at an intermediate position of the arm 21 of the ball nut member 11, and an upper end of the lever 47 is connected to a pin 49 of a block 44 of the outer tube 38. The other end of the lever 47 is in contact with the rear side of a positioning member 52 screwed onto the screw shaft 51 of a knob 50 for adjusting the stopper position (for adjusting the length of removing the coating material). (See FIG. 6). Therefore, by rotating the knob 50 to change the position of the positioning member 52, the position of the outer tube 38 is determined via the lever 47 by the biasing spring 45 of the outer tube 38, and the stopper 41 of the sensor rod 39 is provided. Is set, the insertion depth of the wire end is set, and the stripping length of the covering material is selected. The above-mentioned cut amount adjusting knob 17 is provided with a scale of 5/100 mm unit on the peripheral surface, and the position of the positioning member 52 by the rotation of the stopper position adjusting knob 50 is used to peel off the coating material. As shown in FIG. 7, the display length is converted into the take length and displayed on the display unit 53 which is visible from the outside in the unit of millimeter. In FIG. 1, reference numeral 54 denotes a support base for supporting a wire when inserted. In FIG. 2, reference numeral 55 denotes a motor sensor operated by the ball nut member 11;
Reference numeral 6 denotes a reverse rotation command sensor. Next, the operation of the above embodiment will be described. First, the cutting amount adjusting knob 17 is turned to set the scale so as to obtain a cutting depth corresponding to the diameter of the wire to be handled, and the stripping length of the coating material is adjusted for the stopper position. The user turns the knob 50 to set the desired length position while viewing the display section 53. After that, when the tip of the wire W is inserted between the grippers 22, 22 as schematically shown in FIG. 8, the end of the wire W hits the stopper 41 at the front end of the sensor rod 39, and this is pressed slightly, whereby the sensor is pressed. Rod 3
9 retreats against the weak spring 43 (see FIG. 1) , and its rear end cuts off the sensor 42. When the sensor 42 detects the retreat of the sensor rod 39, the motor 7 is driven to rotate forward by the detection signal, and the main shaft 3 rotates forward. At the beginning of the forward rotation of the main shaft 3,
The ball nut member 11 as shown in FIG. 1 is a brake system 33
As a result, the main shaft 3 moves forward by screwing the ball screw shaft 10 and the ball in the ball nut member 11 by the rotation of the main shaft 3. As a result, the cam rollers 30, 30 are first pushed to both sides by the second conical cam 13, so that the upper ends of the swing members 28, 28 swing in the direction away from each other, and the swing members 28, 28
1 of the rollers 32, 32, and pushes the roller 20,
20 are rotated, and the blade holders 23,
23 operates in the closing direction (shown in FIG. 9). Accordingly, the blades 24, 24 of the blade holders 23, 23 cut the coating material of the wire W to a predetermined depth and hold the same. Further, by the forward rotation of the main shaft 3, the cam rollers 2 of the arms 25 of the sub shafts 4 and 4
6 and 26 are pushed to both sides, whereby the counter shafts 4 and 4 rotate in opposite directions to close the grippers 22 and 22 and grip the wire W. In this state, the front end of the second conical cam 13 of the main shaft 3 comes into contact with the thrust bearing 19 at the inner end of the positioning member 18 to stop the advance, so that the rotation of the main shaft 3 causes the ball nut member 11 to rotate. The ball nut member 11 starts to move in the retreating direction, and the lever 47
The positioning rod 5 is moved by the tension spring 4
By the urging of 5, the levers 47 are pushed back while pressing the upper end thereof, and the tube shafts 20, 20 connected to the ball nut member 11 via the arms 21 are retracted, whereby the wires cut by the blades 24, 24 are cut. The end covering material is pulled out from the core wire and peeled off (see FIG. 10 ). During the backward movement of the ball nut member 11, a load is applied by the brake device 33, and the load is converted into a gripping force of the grippers 22, 22, and the grippers 22, 22, grip the wire W strongly. Counters the pull-out force of the coating. When the coating material is completely removed, the motor 7
Is driven in the reverse direction, the main shaft 3 rotates in the reverse direction and returns to the previous position. At that time, the first conical cam 12 retreats, and the grippers 22 and 22 are opened first by the action opposite to that at the time of closing, and the second conical cam 13 The blade holders 23, 23 are similarly opened by the retreat. Thereafter, the ball nut member 11 advances, and the blades 24, 24 return to the positions immediately after the grippers 22, 22 and stop, thereby completing one process. As for the motor, in addition to the use of a reversible motor, a forward / reverse rotation may be obtained by switching a clutch using a one-way motor. As described above, according to the present invention, the main shaft is provided so as to be slidable in the front-rear direction on the machine frame and performs the gripping operation of the gripper and the clamping and cutting operation of the blade. The main shaft is rotatable forward and backward by a reversible motor, a ball screw shaft portion is provided on the main shaft, a ball nut member is fitted to the ball screw shaft portion via a ball, and the ball screw shaft portion is rotated by a forward rotation of the main shaft. To move the gripper and the blade to close, the ball nut member retreats after the main shaft stops, and the blade is pulled, so that the normal forward / reverse rotation motor is used to grip the wire. Cutting of coating materials,
Since the coating material can be stripped off, the wire stripper can be made extremely small and quiet, and can be provided at a low cost without any restrictions on the place of use.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional side view showing an embodiment of a wire stripper according to the present invention. FIG. 2 is a horizontal sectional view of the same. FIG. 3 is a transverse sectional view of the same. FIG. 4 is a front view showing the gripper and the blade holder on one side for convenience. FIG. 5 is an explanatory diagram showing a relationship between a second conical cam and a pipe shaft. FIG. 6 is an explanatory diagram showing a stopper position adjusting knob. FIG. 7 is an explanatory diagram showing a display section of a cut amount by a cut amount adjusting knob. FIG. 8 is a schematic view showing the operation. FIG. 9 is a schematic diagram showing a state in which the cutting tool sandwiches and cuts a wire covering material in FIG. 8; FIG. 10 is a schematic view showing a state in which the coating material is peeled off. [Description of Signs] 1 Machine frame 3 Main shaft 4 Sub shaft 5 Positioning rod 6 Spline shaft 7 Forward / reverse rotation motor 8 Timing belt 9 Toothed pulley 10 Ball screw shaft 11 Ball nut member 12 First cone cam 13 Second cone cam 15 Detent Pin 16 Detent part 17 Knob for adjusting cut depth 18 Positioning member 20 Tube shaft 21 Arm 22 Gripper 23 Blade holder 24 Blade 25 Arm 26 Cam roller 28 Swing member 30 Cam roller 31 Arm 32 Roller 33 Brake device 34 Base 37 Plate 38 Outer tube 39 Sensor rod 41 Stopper 42 Sensor 47 Lever 50 Stopper position adjusting knob 51 Screw shaft 52 Positioning member 53 Display unit

Claims (1)

(1) A gripper for gripping a coating material at an end of a coating wire at a predetermined length position, and a cutting tool for holding and cutting the coating material immediately after the gripper. , In a wire stripper that pulls the blade in the state of holding the coating material and strips the coating material from the core wire, A main shaft that is slidably supported in the machine frame in the front-rear direction and performs a gripping operation of the gripper and a pinching / cutting operation of a blade; The main shaft is rotatable forward and backward by a reversible motor, and a ball screw shaft portion is provided on the main shaft, and a ball nut member is fitted to the ball screw shaft portion via a ball,
Between the main spindle and the gripper and the blade,
A mechanism including a cam that moves forward and backward with forward and backward movement is provided.
The forward rotation of the main shaft causes the ball screw shaft portion to advance with respect to the ball nut member to perform the closing operation of the gripper and the blade, After the nut member between the ball nut member and the machine frame
This brake is equipped with a braking device
The ball nut member is fixed by the device
Or, to move against a load in the direction of retraction, the cam moves forward with the forward movement of the spindle abuts those
A contact member is provided, and the main shaft is
Is stopped , the ball nut member is retracted by the forward rotation of the main shaft , and a connecting portion is provided between the ball nut member and the blade.
With the material provided, interlocked with the retraction of the ball nut member
A wire stripper characterized in that the blade is pulled while holding the cutting tool.