JPH0337373B2 - - Google Patents

Description

Detailed Description of the Invention <Industrial Application Field> The present invention mainly involves inserting and crimping a plurality of bare conductor portions from which the end coating of a covered electric wire has been peeled off into a sleeve of a sleeve-type crimp terminal. It is used to twist and bundle multiple bare conductor wires before electrically and physically connecting the wires together. The present invention relates to a hand-held electric wire twisting machine used for twisting and binding parts and elements of various electrical devices when connecting them by means such as welding, screwing, and winding.

<Conventional technology> If the above-mentioned wire twisting work is performed manually, it is not only extremely inefficient, but also causes a great deal of work fatigue on the hands and fingers. This tends to cause variations in cohesive strength due to individual differences among workers, which can have various negative effects on subsequent connections, etc.

In view of this situation, for example,
As seen in Japanese Patent No. 43667 and Japanese Patent Publication No. 54-7348, a hand-held automatic twisting machine has been proposed that utilizes rotational centrifugal force to clamp and twist a plurality of bare conductor wires. Although there are some structural differences in the structure of these conventionally proposed automatic twisting machines, in all of them, a plurality of wire clamping pieces arranged at equal or almost equal intervals in the rotational circumferential direction are attached to the tip of the drive rotating shaft. The rotary shaft is pivotably supported around an axis that is parallel or substantially parallel to the axis of the rotating shaft, and applies a centrifugal action to a position in the rotational circumferential direction of the pivot axis opposite to the side where the line clamping piece is present. A plurality of bare conductive wires are formed by integrally connecting a receiving weight part, and swinging each wire clamping piece around the axis center by centrifugal force acting on the weight part as the rotating shaft rotates. It was of the type where the parts were held and twisted.

Furthermore, in Japanese Utility Model Application Publication No. 58-118823, there is a rotating shaft, that is, an electric wire, at each end of two arms that are pivotably supported around an axis perpendicular or almost perpendicular to the axis of the rotating shaft. A structure in which a large flat wire clamping plate is arranged approximately parallel to the wire clamping plate is disclosed, but the wire clamping plate is wide and has a large area in order to clamp the entire bare conductor to be inserted. Therefore, it is difficult to provide a compact hand-held device.
It was designed to be fixed to the floor or workbench.

<Problems to be Solved by the Invention> Therefore, in this type of automatic twisting machine, it is important to ensure that the bare conductor portion is strongly held by the plurality of wire holding pieces. This requires that the rotational centrifugal force be sufficiently large at a constant rotational speed. Considering the above-mentioned stationary conventional machine from the viewpoint of such requirements, it is found that in the conventional machine, the wire clamping piece rotates in the rotational circumferential direction on the opposite side of the line clamping piece with respect to the swing axis of the line clamping piece. Therefore, it is necessary to increase the length of the protruding weight part, and when this weight part swings outward to the maximum extent due to rotational centrifugal force, the outermost part of the weight part is the same as that of the wire clamping part. This is the turning radius. Therefore, if the wire clamping piece and the weight part are formed as a linear, integral series, the radius of rotation will be very large, and if a cylindrical cap is provided to house them to prevent danger, the diameter of the cap will be very large. There is a practical difficulty in that it becomes large and difficult to handle, especially when configured to be hand-held. Furthermore, in order to reduce the rotation radius as much as possible and improve handling in the case of a hand-held type, it is preferable to configure the wire clamping piece and the weight part in a so-called magatama shape so that the tip side thereof approaches the rotation axis. Although it is considered in publications etc., in this case, manufacturing the wire clamping piece and the weight part would be complicated and difficult in terms of shape, and the cost would be high.In addition, the circumferential space occupied by one wire clamping piece would be too large. Due to the large size, the number of wire clamping pieces that can be installed in the same circumferential plane is at most two, and if more than that number are installed, the space required in the circumferential direction is large, the overall diameter becomes large, and it is difficult to handle in the case of a hand-held type. There was a trade-off between wire clamping and twisting performance and size, such as the problem of inconvenience.

<Means for Solving the Problems> In view of the above circumstances, the present invention provides an automatic machine that utilizes rotating centrifugal force, which has excellent wire clamping and twisting performance, is easy to manufacture and compact, and is advantageous in terms of handling. In order to achieve this purpose, the electric wire twisting machine according to the present invention has at least three points spaced at equal or almost equal intervals in the rotational circumferential direction at the tip of the drive rotating shaft. an arm whose tip protrudes relatively long in the direction of extension of the axis of the rotating shaft; A weight part is provided on the proximal end side of the arm to move away from the axis of the rotating shaft due to the centrifugal force of rotation of the rotating shaft, and swing the distal end of each arm toward the extended axis. and the distal end of each arm is in contact with or very close to each other when swinging toward the extension axis due to the rotational centrifugal force,
so as to close or substantially close the stranded wire insertion opening, which is biased to the open state when the rotation is stopped;
Along the direction of the swing axis of the arm, a line clamping piece is arranged in a row in the shape of a relatively wide rectangular plate and has an inclined posture such that the closer to one end it approaches the swing axis in the width direction, The rotating shaft and the arm are removably connected to the grip cover, and the distal end thereof is housed in a cylindrical cap having a wire insertion guide hole into the opening. It is characterized by this structure. To summarize this in other words, there are three or more wire clamping pieces arranged at equal or almost equal intervals in the circumferential direction of rotation, and a mechanism for swinging these wire clamping pieces in the line clamping direction by rotational centrifugal action. The oscillating axis of the series integrated with the weight part is perpendicular or substantially perpendicular to the axis of the drive rotation shaft, and the wire clamping piece is in the shape of a rectangular plate and arranged at an angle with respect to the axis. has been done. This means that the point has a characteristic configuration.

<Function> According to the electric wire twisting machine according to the present invention having the characteristic configuration as described above, when the rotation of the drive rotation shaft is stopped, the plurality of wire clamping pieces are oscillated to the side away from the extension axis of the rotation shaft. Since the opening for inserting the wires is open, one-handed operation from the front of the machine allows the multiple bare conductors to be twisted and bundled to a depth where the uncoated stripped ends of the wires reach the position of the wire clamping piece. It can be easily inserted. When the drive rotation shaft is driven and rotated in such an inserted state, each arm swings due to the rotational centrifugal force acting on the weight portion, and the wire clamping piece at the tip swings toward the extension axis of the rotation shaft. The proximal end portions of the plurality of bare conductor portions that are moved and inserted and held as described above are clamped from the outside with a force corresponding to the centrifugal force.

By pulling out and moving the plurality of wires in the opposite direction to the above-mentioned insertion direction in this sandwiched state, a twisting force is applied to the plurality of bare conductor portions to twist and bind them. be.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings.

In FIGS. 1 to 9, reference numeral 1 denotes a drive that is rotatably supported only through a bearing 10 that is held inside a bottomed cylindrical holder 15 that is fitted into the tip of a cylindrical grip cover 8. It is a rotation axis,
This is an example of a rotational drive source, and is directly connected to the air motor 6 built into the base end of the grip cover 8. The grip cover 8 has an outer diameter of about 30 mm and is configured so that it can be strongly gripped with one hand. has been done. 1
Reference numeral 1 denotes an arm holder which is concentrically fixedly connected to the tip of the rotating shaft 1 via a bearing 16 and a lock bolt 12 so as to be able to rotate integrally with the rotating shaft 1, and the tip in the direction of the cylinder axis. Annular members 11A and 11B having different wall thicknesses are integrally connected in the vicinity and at a position a suitable distance behind the annular members 11A and 11B, and the peripheral walls of these annular members 11A and 11B have a central angle of 120 degrees in the rotational circumferential direction. Notches 11a and 11b each having a substantially angular U shape when viewed from the front (as viewed in the direction of the rotational axis) are formed at three equally spaced locations.

2 is each notch 11 on the tip side of the front holder 11
three arms 2 are arranged at equal intervals in the circumferential direction of the rotation while being fitted and held in the holder 11, and each of these arms 2 has a distal end extending from the axial line of the rotating shaft 1 beyond the distal end edge of the holder 11. At the proximal end portion which has a relatively long protruding length toward the direction and is fitted into each of the notches 11a,
The rotating shaft 1 is inserted and held in the annular member 11A so as to cross each of these notches 11a.
It is pivotally supported via a pin 13 having an axis substantially perpendicular to the axis, so that each arm 2 is connected to the pin 13.
It is configured to be able to swing freely around the axis. Now, to explain the detailed structure of each arm 2, as clearly shown in FIGS. 7 and 8, the base end side of each arm 2 has a rotary centrifugal force of the rotary shaft 1. A weight part 3 that moves away from the axis and acts to swing the tip of each arm 2 toward the extension axis is linearly integrated in a direction opposite to the tip of the arm 2. The weight portion 3 is fitted and held in the rear end side notch 11b, and the tip of each arm 2 is provided with an extension axis side due to the rotational centrifugal force. As shown in FIG. 5, when the arms 2 are pivoted, they come into contact with each other as shown in FIG. As shown in FIG. 5, a wire clamping piece 5 is provided to close the twisted wire insertion opening 4, which is biased and maintained in the open state as shown in FIG. It is constructed by cutting materials such as , and is made into a series of integral parts and generally in a generally linear shape. Each of the wire clamping pieces 5 has a relatively wide rectangular plate shape along the direction of the swing axis of the arm 2, and has an inclined position such that the closer to one end it approaches the swing axis in the width direction. It is composed of Reference numeral 9 denotes a cylindrical cap that is removably attached to the tip of the grip cover 8 via a threaded portion 17 so as to house the holder 11 and the second group of arms. To explain, as clearly shown in FIG. 9, a wire insertion guide port 9A is formed at the tip thereof in a state of being coaxially connected to the opening 4, and this guide port 9A
The cap 9 is formed in a tapered shape with an inner diameter that gradually becomes smaller toward the side closer to the opening 4, and a position near the base end of the cap 9 prevents dust from entering between the inner and outer races of the bearings 16 and 10. An annular washer 18 is press-fixed to the outer surface of the holder 15 and bearing 16 when the cap 9 is screwed and connected to the grip cover 8 in order to prevent intrusion and leakage of lubricating oil for the bearing. A presser foot 19 is integrally formed in an annular shape so as to protrude inwardly.
Notch portion 19A that allows passage of the weight portion 3 integrally connected to the
is formed on the circumferential wall of the cap 9 near the position where the group of wire clamping pieces 5 is present, to allow high-pressure air drawn into the cap 9 from the air motor 6 during operation to escape to the outer periphery of the cap 9. , a slit-shaped hole 20 for discharging and removing so-called scraps such as broken wires generated during twisting out of the cap 9 on the escape air flow.
is formed. Reference numeral 7 denotes an operating lever for rotating and stopping the air motor 6, and the air motor 6 is pivotally mounted to a cylindrical grip cover 8 provided inside. 21 is a rotation controller for the air motor 6.

The electric wire twisting machine configured as a hand-held type as described above is
An operator grasps the grip cover 8 with one hand, grasps the sheathing part a of the electric wire A with the other hand, and inserts the plurality of bare end conductor parts b into the center of the cylindrical cap 9 through the tip insertion guide opening 9A. After inserting into the opening 4 through the guide action, the air motor 6 is actuated by operating the lever 7 to drive and rotate the rotating shaft 1 and the holder 11, as explained in the section of the above-mentioned action. During this twisting operation, most of the air bleed from the air motor 6 into the cylindrical cap 9 escapes to the outside side from the hole 20 formed in the circumferential wall of the cap 9. Since the debris generated in the cap 9 is discharged to the outside together with the escape air, blowback from the insertion guide port 9A is suppressed, and at the same time, the air density in the cap 9 is maintained at a relatively low state. Therefore, a noise reduction effect is achieved by reducing so-called wind noise caused by high-speed rotation of the wire clamping piece 5, the arm 2, and the group of weight parts 3. After the twisting operation, if necessary, the cap 9 is unscrewed from the grip cover 8 and pulled out forward to expose the arm group 2 and can be cleaned.

Other examples will be listed below.

[] The rotational drive source for the rotating shaft 1 may be a hydraulic motor, an electric motor, etc. other than the air motor.

[] As shown in FIG. 10, in the shape of the wire clamping piece 5, by forming the central part of the wire clamping edge 5a in an arc shape, the plurality of bare conductor parts do not come apart when clamping and twisting, and are kept in the center. As a result, the desired twisting and binding can be performed more reliably and strongly.

[] In order to prevent the contact and clamping edge of the bare wire portion b of the wire clamping piece 5 from becoming a knife edge, as shown in FIG. It goes without saying that it is also possible to round the clamping piece 5, round it only at both corners, or provide a coating or removable cover type covering 5b to both provide wear resistance treatment and line breakage prevention treatment for the holding piece 5. be.

<Effects of the Invention> As is clear from the detailed description above, the present invention has the following advantages: (1) By effectively utilizing rotational centrifugal force, the desired wire clamping and twisting work can be easily and quickly performed. , (2) By arranging the wire clamping piece in a special configuration and making its swing axis substantially orthogonal to the rotating shaft axis, the actual required radius of the wire clamping part can be reduced compared to the conventional product described above. The product can be made smaller than the conventional one, and can be made compact and easy to handle, especially when constructed into a hand-held type that is convenient for practical use.

(3) Moreover, since the entire arm including the wire clamping piece and the weight part can be configured into a substantially straight line,
Manufacturing is easy and costs can be reduced, and the number of wire clamping pieces installed in the circumferential direction within the same plane can be increased to three or more without increasing the overall diameter or size, making it possible to achieve the desired wire clamping and twisting. This made it possible to make the action extremely reliable and stable.

[Brief explanation of the drawing]

1 to 9 show one embodiment of the present invention, FIGS. 1 and 2 are partially cut away perspective views, FIG. 3 is a partially cut away side view, and FIGS. 4 and 5 are Enlarged longitudinal sectional front view of main parts corresponding to Figures 1 and 2, Figure 6
The figures are a longitudinal sectional front view taken along the line of Fig. 3, Figs. 7 and 8 are enlarged side views and plan views of the components, Fig. 9 is a semi-vertical sectional side view of the cylindrical cap, and Figs. Figures 11A, 2B, and 11C show different embodiments, respectively. Figure 10 is an enlarged perspective view of the components, and Figure 11
Figures A, B, and C are enlarged sectional views of important parts. 1 is the drive rotation shaft, 2 is the arm, 3 is the weight part, 4
Reference numeral denotes an opening for inserting twisted electric wires, 5 a wire clamping piece, 6 a rotary drive source (air motor), 7 an operating lever, 8 a grip cover, and 9 a cylindrical cap.

Claims (1)

[Claims] 1. A plurality of arms 2 are pivotally supported at the distal end of the drive rotation shaft 1 so as to be able to swing around the axis, and are arranged at equal or approximately equal intervals in the rotational circumferential direction. Ori,
On the base end side of these arms 2, there is a weight that moves away from the axis of the rotating shaft 1 due to the centrifugal force of rotation of the rotating shaft 1, and swings the wire clamping side toward the axis. The rotating shaft 1 and the arm 2 are removably connected to the grip cover 8, and the tip thereof is housed in a cylindrical cap 9 having a wire insertion guide port 9a into the opening 4. In the electric wire twisting machine, a wire clamping piece 5 is connected to the tip of each of at least three arms 2 that protrude relatively long in the direction in which the axis of the rotating shaft 1 extends. The line clamping pieces 5 are pivoted around axes that are orthogonal or almost orthogonal to each other, and when the line clamping pieces 5 swing toward the extension axis side due to the rotational centrifugal force, they abut or approach each other and stop rotating. In order to close or substantially close the stranded wire insertion opening 4, which is sometimes biased to the open state, a relatively wide rectangular plate shaped along the swing axis direction of the arm 2 and one end in the width direction thereof is provided. A wire twisting machine characterized in that the wire twisting machine is configured in an inclined position such that the side approaches the swing axis. 2. The electric wire twisting machine according to claim 1, wherein the rotational drive source of the rotating shaft 1 is an air motor 6. 3. The electric wire twisting machine according to claim 1, wherein the grip cover 8 is provided with an operating lever 7 for rotation and rotation stop.