JPS5810282B2 - Himonichiyouriyokuokakesetstudanrutamenokogu - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a power-driven tool for applying tension to a string and cutting it, particularly a power-driven tool for applying tension to a string that binds a bundle of wires, etc., and then cutting off the remaining portion. Regarding tools.

Conventional tools require a complicated linkage between the power source and the string cutting means because the string is wound around a bundle of wires, tension is applied, and then the string is cut.

Accordingly, a power driven tool having a simple connection between a power source and a lace cutting device would be desirable.

One prior art tool utilized a rotating rond to cut the cord.

Such configurations have presented safety problems such as the operator's hands becoming trapped within the tool as the operator must grasp the small exposed end of the string.

Therefore, it would be desirable to have a power-driven tool that minimizes the safety issues inherent in using a rotating rod to cut laces.

Conventional power-driven tools utilize dual actuating air cylinders in which the string gripper is pneumatically returned to its original position once the free end of the string is severed.

When such a configuration is utilized, there is a possibility that an operator's fingers may be caught between the nose of the tool and the string gripper since the pneumatic return force is supplied to the gripper.

Therefore, it was desirable to minimize as much as possible the injury to the operator caused by the rapid return of the gripper that has severed the string.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a power-driven tool for rapidly and economically winding string around a bundle of wire or the like and thereafter cutting the free end of the string.

Another object is to provide a tool that minimizes the safety issues inherent in the use of rotating ronds for cutting cord.

Still another purpose is to avoid injury to the operator due to the string gripper being rapidly returned by pneumatic pressure. An object of the present invention is to provide a tool which connects and applies uniform tension to a string wound around a bundle of wires or the like.

Yet another object is to provide a simple yet highly improved tool.

A tool according to the invention comprises: a housing; a device for gripping a string; a motor device for driving the string gripping device in a first direction to apply tension to the string gripped by the gripping device; a motor device mounted to the housing so as to be movable in a second direction opposite to said direction by a force applied as a tensioning reaction force from a string; said tensioning force and therefore said reaction force being of a predetermined magnitude; a device for suppressing movement of the motor device in a second direction until the tension reaches the predetermined magnitude, causing the motor device to move in the second direction against the suppressing force of the suppressing device; a cutting device adapted to be moved accordingly to cut the cord.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

Referring to FIG. 1, there is shown a tool 10 for tensioning and cutting the cord, which includes a housing member 12 and a cover member 13 made of cast material such as aluminum.
It includes a pistol-shaped housing 11 which is fastened with, for example, screws 14.

As best shown in FIG.
includes an air or fluid cylinder type motor having an actuation valve and hose 17 for connecting the air or fluid cylinder 15 to an external air supply through an upper fitting 19 and a lower fitting 18.

The movable string gripper member of the tension rod 22 has a cylinder plunger 23 at one end and is mounted for substantially linear movement.

The outer end of the tension rod 22 is attached to a gripper 24 having teeth 25 on its top for engagement with the underside of the free end of the lace 26.

A laterally extending lug 27 is positioned on the top of the gripper 24 to support the upper side of the free end of the lace 26 when the gripper teeth 25 are resiliently biased to engage the underside of the free end of the lace 26. It is made to do so.

The gripper 24 is biased from the position shown in FIGS. 3 and 4 to the position shown in FIGS. 3 and 4 by a spring, not shown, which continuously biases the gripper in a counterclockwise direction.

In Figures 1 and 2, the front portion of the housing member 12 forces the gripper 24 into a position opposite the bias of the spring, allowing insertion and/or removal of the lace.

A dog 28 extends downwardly from the gripper 24 and cooperates with the camming surface to return the gripper to its open position so that the free end of the lace 26 can be disengaged as will be described in more detail below.

A cutter device 31 is positioned within the housing 12 for cutting the free end of the string when tension is applied to the string, the device being pivotally mounted about a pivot pin 34 supported by the cover member 13 and the housing member 12. It has a cutter blade 32 attached to a lever arm 33.

A groove 35 is provided in the lever arm 33 and gripper 24
The dog 28 is placed within the groove and allowed to move along it while being under the tension of the lace 26.

Movement of the dock 28 to the rearmost end of the groove 35 causes the string gripper 24 to pivot clockwise from the position shown in FIG.
It separates from engagement with tooth 25 of No. 4.

A rearwardly open hole 36 is provided at the end of the arm lever 33 on the opposite side of the cutter device 32.

A linkage in the form of a link plate 37 is pivoted about a pivot 38 supported by the housing member 12 and the cover member 13.

At the top of the link plate 37 shown in Figures 2, 3 and 4, a cam follower 39 including a first cam roller is provided adjacent to the forwardmost portion of the air cylinder.

A hardened pin is set within the cylinder to support engagement with the cam follower 39 and prevent wear on the air cylinder.

Between the cam follower 39 and the link plate pivot 38, an actuating member in the form of an actuating pin 40 is connected to the link plate 37.
and is set within the rearmost aperture 36.

A 29th cam roller 41 is located at the bottom of the link plate 37.
is mounted on the cam surface 42 of a pivot arm 43 which is pivotally mounted within the housing by a cam pivot 44.
is set up against.

The cam surface 42 is biased to the position shown in FIGS. 2 and 3 by a suitable biasing device mounted on the pivot arm at an opposite location with respect to the pivot axis 44 in that arm.

3A, one preferred biasing device for biasing the cam surface 42 into the position shown in FIG.
6 is included.

A movable block 48 is slidably positioned within a yoke 46 which has a spring 49 between its lower portion and the block 48.

The tension setting knob 50 is set toward the outside of the housing 11 and is attached to the movable block 48 by a tension setting rod 51.

This rod passes through a hinge pin 52 which is rotatable relative to block 48 and is attached to knob 50.

The hinge pin 52 is eccentrically positioned within the tension setting knob 50 and the knob 50 rotates around the hinge pin 52.

The end of the tension setting rod 51 is movable outwardly from the housing and the distance varies between the pin and the housing with the amount of knob material.

Additionally, the tension setting knob 50 and the tension setting rod 51 attached thereto can be rotated with respect to the movable block 48 such that turning the knob 50 clockwise or counterclockwise will cause the movable block 48 to compress the spring 49. Stretch or move in a straight line in either direction.

Therefore, the spring 49 is connected to the movable block 48 and the yoke 4.
6, it can be seen that the more force is required to pivot the cam surface 42 clockwise about the pivot 44 from the position of FIG.

Additional biasing means are disclosed in U.S. Pat. No. 3,661,187, which is incorporated herein by reference.

Support means in the form of a plastic support strip 53 provided radially around the air cylinder 15 allows the air cylinder to move linearly within the housing 11.

A trigger 54 is pivotally mounted within the housing member 12 and cover member 13 for actuating the air cylinder valve 16.

During operation of the tool, the end of the string is positioned adjacent the gripper 24, as shown in FIG. The force forces plunger 23 and rod 22 to the right in FIG.
Add tension to 6.

When the desired tension, as adjusted by the offset on cam surface 42, is reached, air cylinder 15 moves to the left from the position of FIG. 3 as shown in FIG.

That is, the force of the pressurized air in the air cylinder that moves the plunger to the right against the tension of the string 26 is applied in the opposite direction due to the principle of action and reaction, and the force is applied to the air cylinder 1 in the opposite direction.
Force 5 to move to the left.

The moment about the pivot 38 created by this force acting against the cam follower 39 causes the second cam follower 41 to
3, the air cylinder 15 begins to move to the left in FIG.

The movement of the cylinder 15 causes the link plate 37 to pivot about the pivot 38 and move the actuation pin 40 counterclockwise about the pivot 38 against the bottom cam surface of the rearwardly open hole 36. , as a result, the cutter blade 32 becomes the fourth
It is forced upwardly as best shown in the figure, cutting the string 26.

The length of movement of the cutter blade 32 is varied by changing the slope of the bottom cam surface of the hole 36.

In the above, it has been explained that the leftward movement of the air cylinder 15 is due to the pressurized air supplied to the inside thereof.
In other words, the movement of this air cylinder is caused by the gripper 24,
It can be said that this is caused by the reaction force given by the tension from the string applied to the air cylinder through the rod 22 and plunger 23.

Therefore, by appropriately setting the biasing force of the spring 49, it is possible to move the air cylinder and cut the string when a desired tension is applied to the string.

Once the string is cut or released from tension, the force on the string restraining tension rod 22 from moving to the right as shown in FIG. Move to the rearmost position within the cylinder 15.

In FIG. 4, a line perpendicular to the cam surface at the contact point between the roller 41 and the cam surface 42 passes under the pivot 38,
A restoring force is therefore created on the ring plate 37 and passes under the pivot 38 so that it returns to the position shown in FIGS. 2.3 and 5.

Therefore, as shown in FIG. 5, once the free end of the string 26 is cut by the cutter blade, the link plate 37 returns to its original position.

As long as the trigger 54 is pulled, the tension rod 22 remains in the position shown in FIG. 5, thereby causing the dog 28 to release the teeth on the gripper 24 from the string so that the string can be removed from the tool. is positioned against the final wall 35a of the groove 35.

When trigger 54 is released, valve 16 returns to its original position;
Air is slowly discharged from cylinder 15 around valve 16 as plunger 23 is biased to the left as shown in FIG. 4 by spring 56.

The return speed of the gripper 24 can be adjusted to prevent the operator of the tool from having his or her fingers trapped between the gripper 24 and the nose of the tool.

Another embodiment of the invention is shown in FIG.
The air cylinder 15 in FIGS. 5-5 has been replaced by an electric motor 57 with a gear hook.

The air valve 16 in FIGS. 1-6 has been replaced by a switch 58 and the tension rod 22 has been replaced by a motor drive screw 59 and a threaded tension sleeve 60 attached to the gripper 24.

The switch 5 is connected to the electric cord 61 to conduct electricity from the power source.
8 and is attached to the motor 5T.

Dogs 28 placed within grooves 35 absorb the torque that rotates sleeve 60.

To absorb as much of this torque as possible, the tension sleeve 60 has a non-circular cross-section so as to pass within a non-circular groove in the housing.

The motor housing 57 of the motor 57 is also provided with suitable means for preventing rotation of the motor housing.

If a limit switch (not shown) is installed, it is impossible to prevent the motor from stopping at the end of the stroke of the motor drive screw 59 during operation.
Movement of the housing for motor 57 causes link plate 37 to pivot about axis 38 when the moment about axis 38 created by the force acting against it exceeds the moment caused by the biasing force acting against roller 41. , the actuation pin 40 moves counterclockwise around the pivot 3B, forcing the cutter blade 32 to be biased upward to cut the string.

It is clear that other preferred motor devices can be used in place of the air cylinder 15 or the electric motor 57.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a power-driven tool according to the present invention;
Figure 2 is a longitudinal sectional view of the same tool, Figure 3 is a sectional view of the tool before applying tension to the string and cutting it, and Figure 3A is a device for adjusting the tension applied to the string. cross section,
FIG. 4 is a cross-sectional view showing the cutter blade trying to cut the string, FIG. 5 is a cross-sectional view showing the cutter blade cutting the string, and FIG. 6 is a cross-sectional view showing another embodiment of the present invention. Figure 0
10... Tool, 11... Housing,
15...Motor device (air cylinder), 24.
... Gripping device (gripper), 31 ... Cutting device, 37 ... Ring plate, 43 ...
... Pivoting arm, 49 ... Spring, 50
・・・・・・Nop, these elements 37°43.4
9, 50, etc. constitute a movement suppressing device of the motor device.

Claims (1)

[Claims] 1. A housing: a device for gripping a string; a motor device for driving the string gripping device in a first direction to apply tension to the string gripped by the gripping device; a motor device mounted on the housing so as to be movable in a second direction opposite to said direction by a force applied as a reaction force to the tensioning from the string; said tension and therefore said reaction force to a predetermined magnitude a device for restraining the motor means from moving in a second direction until the tension reaches the predetermined magnitude, causing the motor device to move in the second direction against the restraining force of the restraining device; A tool for applying tension to a string and cutting the string, comprising: a cutting device that is moved in accordance with the movement of the string to cut the string;