JPH04308408A - Cable length switching device and its manufacture - Google Patents

Abstract

PURPOSE:To switch the controlling position of the drawing-out length of a cable to be wound around an air-core when the cable is drawn out from the inside and, at the same time, to prevent the alignment of the wound cable from being disturbed by inserting cable length switching shafts into a plurality of points corresponding to the required drawing-out length of the cable in removable states. CONSTITUTION:In this cable length switching device for hanging a marine sensor, etc., to a prescribed depth, an arm 5c is engaged with a locking section 12b corresponding to a desired depth by rotating the arm 5c and a lever 5 is fixed to a prescribed position. When the hook 5b of the lever 5 is engaged with the engaging section 13a of a switching shaft 13, the shaft 13 is removed when a floating-up section 11 is separated from a case 10, but, since the hook 5b is not engaged with the locking section 14a of another switching shaft 14, the shaft 14 is left in a cable 1 as it is. The cable 1 wound around the shaft 14 winds round the switching shaft and the drawing-out of the cable is stopped.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention regulates an air-core wound cable to a predetermined required length when the cable is let out from the inside thereof, and also controls the length of the unwound length to a predetermined length. The present invention relates to a device that can be switched at any time, and a method for manufacturing this device.

0002

2. Description of the Related Art A conventional cable length switching device of this type is disclosed in Japanese Utility Model Application Laid-Open No. 62-140067, and the conventional structure will be explained below based on this. FIG. 13 is a front cross-sectional view of a conventional cable length switching device, FIG. 14 is a top view of FIG. 12, and FIG. 15 is a perspective view of a main part showing a stored state of a string for changing the length of a cable to be fed out. In FIGS. 13 to 15, 1 is a cylindrical air-core-wound cable, 2 is a case in which this cable 1 is stored near the bottom, and 3 and 4 are air-core-wound cables 1 on top of the case. These are donut-shaped upper and lower holding plates that are held in a pinched manner from the bottom. Both holding plates 3 and 4 are fixed to the case 2, and the cable 1 is held by the holding plates 3 and 4. It is held in place within 2. The cable 1 is configured such that the terminal 1a is let out from the inside of the air core in the direction of arrow A in the figure.

5 is attached to the upper surface side of the upper pressing plate 3 via an attachment plate 6 fixed to the case 2 in the direction of arrow B in the figure.
This lever 5 is attached to the center so that it can rotate in the direction of the cable 1 pulled out from the terminal 1a.
It has a hole 5a through which the hole 5a passes, and a hook 5b that fits into a cable extension length switching string fixed in the middle of the cable 1, which will be described later, is attached to one end of the hole 5a, and a hook 5b is attached to the other end. In order to arrange the hook 5b at a predetermined position, an arm 5c having a protruding locking portion 5b that fits into one of the plurality of holes 6a provided in the mounting plate 6 is attached to the outer periphery. It has a structure that extends in the direction. Reference numeral 7 denotes cable length switching strings (strings) fixed at multiple locations along the cable 1 by a desired method such as gluing or caulking.
(hereinafter simply referred to as a switching string), a ring-shaped engagement ring 7a is formed on one end side, and this engagement ring 7a is projected upward from a plurality of elongated holes 6b formed in the mounting plate 6. The hook 5b of the lever 5 is engaged with the engagement ring 7a.

Next, storage of the switching string 7, which is a key part of this device, will be explained using FIG. 14. Note that FIG. 14 shows a state in which, in addition to the switching string 7, another switching string 8 is fixed. FIG. 14 is a perspective view showing how the cable 1 is wound with an air core. The cable 1 is just wound to a predetermined length to be switched first, and the switching string is wound to a predetermined length to be switched first. After the cable 7 is fixed to the cable 1, it is shown wound two to three times, and a similar cable to the switching string 7 is placed at a predetermined position spaced apart from the switching string 7 by a predetermined distance. Another switching string 8 is fixed. The switching strings 7 and 8 are woven into a cylindrical shape by the switching string, and have engaging rings 7a and 8a at one end.
are formed, and the cable 1 is passed through the cylindrical string portions 7b and 8b at the other end.

[0005] In FIG. 14, which shows the cable 1 being wound around the core, the other switching string 8 is used when the cable 1 passes through the inside of the cylindrical string portion 8b and comes out from the middle. Of course, this switching string 8 is also shown in a state in which the switching string 7 is
Similarly, it is wound in the state shown in the figure. By the way, as shown in the figure, when the cable 1 is wound to a predetermined length, for example, the length at which the switching string 7 is fixed, a plurality of engagement rings 7a of the switching string 7 are formed on the pressing plate 3. It is taken out from a corresponding one of the holes 3a.

Thereafter, the cable 1 is wound onto the switching string 7 until it reaches a predetermined length for the next switching, that is, the length at which the switching string 8 is fixed. When the cable 1 is wound to the next predetermined length to which the switching string 8 is fixed, the switching string 7
Similarly, this switching string 8 is also processed, and the cable 1 is further wound. According to this, regardless of the length of the cable 1 actually wound, the length of the cable 1 is the same as the length of the position where the first switching string 7 is fixed or the length of the second switching string 7.
The structure is such that the length can be changed to one of three lengths: the length at the fixed position of the switching string 8, or the entire length of the cable 1.

Next, the conventional switching operation with the above configuration will be explained. First, the predetermined length of the cable 1 to be fed out is switched by operating the lever 5. That is, by rotating the lever 5 in the direction of arrow B as shown in FIG. As a result, the locking portion 5b of the lever 5 and the hole 6a are fixed at a predetermined position with an appropriate fitting force.

[0008] In FIG. 14, the lever 5 is shown with one arm 5c fixed right sideways; in this state, the hook 5b on the other end side is a switch protruding from the hole 3a of the upper holding plate 3. Since it engages only with the engagement ring 8a of the switching string 8 located on the front side of the cables 7 and 8, the cable 1 is let out to a medium length, but if the lever 5 is moved to the upper part in the figure. When rotated, the hook 5b engages with both the engaging rings 7a and 8a of the switching strings 7 and 8, resulting in the shortest cable length. Then, when the lever 5 is rotated downward in the figure, the hook 5a of the lever 5 is not caught on either of the switching strings 7, 8, and the cable 1 is completely let out, resulting in the longest length of the cable.

Next, the operation of fixing the cable will be explained using FIG. 14. In FIG. 14, the lever 5 is located at the center of the plurality of holes 6a of the mounting plate 6, and the cable 1 is fed out to a medium length. First, the cable 1 is let out to the outside through the hole 5a of the lever 5, and is let out to the predetermined cable length that can be switched first, that is, the shortest cable length to which the first switching string 7 is fixed. , this switching string 7 is pulled out by the cable 1. However, in the case of FIG. 14, the engaging ring 7a of the switching string 7 is not engaged with the hook 5b of the lever 5, so the switching string 7 can be pulled out through the hole 6a of the mounting plate 6 and the hole 3a of the holding plate 3. ,
It is fed out together with cable 1 and goes out.

[0010] Therefore, the cable 1 is not held back at a short cable length, but is further unrolled to the next predetermined cable length to be switched, that is, to the middle cable length position, and is fixed at this part. The second switching string 8 that has been connected is pulled out by the cable 1. However, as shown in FIG. 14, since the hook 5a of the lever 5 is engaged with the engagement ring 8a of the switching string 8, the switching string 8 is connected to the hole 8a of the mounting plate 6.
a. It is fixed without coming out from the hole 3a of the holding plate 3. As a result, the switching string 18 woven into a cylindrical shape is stretched by the let-out cable 1, and the inner diameter of the cylindrical part becomes thinner, and the cable 1 passing through the cylindrical part is passed through Tighten and fix the entire length to stop feeding. At this time, cable 1, switching string and 8
Since the fixation is performed by dispersing the force over the entire portion of the switching string 8 that is passed through the cylindrical string portion 8b, the cable 1 is fixed to the case 2 without damaging the sheath or the core wire. Although not shown, even when the arm 5c of the lever 5 is turned to the uppermost position, the cable fixing operation is similar to the above-mentioned operation.

[0011]

However, the prior art with the above-described configuration has the following problems. First, before winding the cable in an air-core manner, multiple switching strings for switching the length of the cable are passed from the end of the long cable through the cylindrical end that is woven into a cylindrical shape, and then glued or glued in place. The switching string must be fixed using fixing means such as caulking, and the assembly work for fixing the switching string is time-consuming, leading to high costs. Furthermore, in the prior art, as shown in the perspective view of FIG. 16 showing the conventional problem and the sectional view of the same in FIG. Then, the switching string 7 swells in the radial direction, resulting in a step E between C and D in the figure. For this reason, the switching string 7
The cable winding is disordered after the cable is stored, and aligning the cable 1 to air-core winding is inefficient and takes a lot of man-hours, and when the cable 1 is fed out, a stable feeding force cannot be obtained, making it unreliable. There was a problem of not being able to secure sex.

[0012] The present invention has been made to solve the above-mentioned problems, and it is possible to place a switching string in a predetermined position to change the length of the cable without the troublesome work of inserting it from the end of the cable. The cable length switching means can be installed to simplify the assembly work, and the switching string does not create any steps in the air-core winding of the cable, thereby preventing the winding of the cable from being disordered.
It is an object of the present invention to provide a cable length switching device that is easy to assemble a cable length switching means, easy to air core wind the cable, and has high operational reliability during unwinding, and a manufacturing method that can easily manufacture the device. do

[0013]

[Means for Solving the Problems] In order to achieve the above object, the present invention uses a bar-shaped switching shaft instead of the switching string, and penetrates the holding plate supporting the cable. , the cable is hooked onto the switching shaft to switch the feeding length.

That is, the air-core-wound cable is held by a holding plate having a cable feed-out hole in the center from the upper and lower surfaces and stored in the case, and is removably fitted to the upper part of the case. A lever having a hook at one end is attached to the bottom surface of the floating part so as to be rotatable about the cable feeding hole, and the lever has an engaging part at one end that engages with the hook of the lever for changing the length of the cable. By passing the shaft vertically through the holding plate with the engaging portion protruding toward the upper side of the holding plate, the shaft is arranged to cross the circumferential surface of the air-core wound cable, and the shaft is placed in a predetermined manner. It is inserted into multiple locations corresponding to the required length of the cable that has been air-core wound to its length. By rotating the lever, the hook of the lever engages with the engaging part of the cable length switching shaft, and the cable length switching shaft can be pulled out from the cable by detaching the floating part from the case. By doing so, we decided to switch the length of the cable.

[0015] Furthermore, regarding the manufacture of the cable length switching device, the cable is held from above and below by a holding plate having a cable feeding hole in the center, and a shaft portion is attached to the outer peripheral surface of the cable which has been air-core wound to a predetermined cable feeding length. A jig shaft having an elliptical cross-sectional shape is passed through the holding plate so that the long axis direction of the shaft part of the jig shaft is located in a straight line with the center of the air-core wound cable. After that, the remaining cable is evenly wrapped around the jig shaft. In this way, when all the cables have been wrapped, the jig shaft is rotated 90 degrees and removed from the cable, and the jig shaft is inserted into the gap that is formed after the jig shaft is removed, and the diameter of the jig shaft is equal to that of the jig shaft. Alternatively, a cable length switching shaft having a shaft portion formed with a narrow diameter is inserted so as to penetrate through both the upper and lower pressing plates.

[0016]

[Operation] With the above configuration, cable length switching is performed by operating the lever, and when the lever is aligned to the position corresponding to the preset feeding length, the hook at one end engages with the engaging part of the switching shaft. engaged or disengaged. When the hook is engaged with the engaging portion, the entire length of the cable is let out without being stopped by the switching shaft. In other words, since the cable is fed out by the floating part detaching from the case, the switching shaft also separates from the case together with the floating part due to the hook and the engaging part, and the cable does not have to switch its feeding length. , the full length is extended. Furthermore, if the hook does not engage with the engaging portion, the switching shaft will not be pulled out from the cable even if the floating portion separates from the case. Therefore, when the cable wound inside the switching shaft is unwound and the outside of the switching shaft is also unwound, the several turns that are being unwound will wind around the switching shaft, and the cable will not be unwound from then on. It can be stopped. Thereby, the cable is switched to a predetermined length.

Furthermore, in the method for manufacturing the cable length switching device, when the cable is air-core wound, the diameter of the shaft portion is set to the shaft of the switching shaft instead of the switching shaft at the position where the switching shaft is arranged. Arrange a jig shaft with an oval cross-sectional shape with the same or larger diameters so that the long axis of the oval is in line with the center of the cable, and pass it through the upper and lower holding plates. By doing this, the cable is further wound around the outside of this jig shaft, so it can be wound uniformly without creating a step at the feeding length switching position. After winding all the cables, if the jig shaft is rotated 90 degrees, the jig shaft can be easily pulled out from between the cables, and the switching shaft can be replaced in the gap after it has been pulled out. In this case, a cable length switching device will be manufactured.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front sectional view showing the structure of the cable length switching device of this embodiment, and FIG. 2 is a top view of FIG. 1. Using these, the structure of the device will be described first. In this embodiment, parts with the same reference numerals as in the conventional example are substantially the same as the parts described in the conventional example. In FIGS. 1 and 2, 1 is a cable wound into a cylindrical air core, and 3 and 4 are doughnut-shaped upper and lower holding plates that hold the cable 1 between its upper and lower surfaces. The cable 1 is held within the case 10 by these holding plates 3 and 4. And cable 1
The terminal 1a is extended from the inside of the hollow core in the direction of arrow A in the figure.

Reference numeral 11 denotes a floating section, which is fitted and connected to the upper opening surface of the case 10 and has a structure that can be separated from the case 10. The bottom surface of this floating part 11 serves as a mounting plate 12 for the lever 5, and has an opening in the center for letting out the end of the cable 1, and is rotatable through a hole 5a in this opening. It has a recess 12a at a position corresponding to the hook 5b of the lever 5 attached to the lever 5, and has a plurality of locks on the other end that lock in correspondence with the locks 5d provided on the arm 5c of the lever 5. Holes 12b, 12c
, 12d are formed. Reference numerals 13 and 14 indicate cable length switching shafts (hereinafter simply referred to as switching shafts) that pass through the air-core wound cable 1 in parallel with its axial direction, and one end thereof is engaged with the hook 5b of the lever 5. It has ring-shaped engaging parts 13a and 14a that fit together, and the shaft part passes through the wound cable 1 from the elongated hole 3a side of the upper holding plate 3 and penetrates in the direction of the lower holding plate 4 on the opposite side. It is long enough. In this embodiment, as shown in FIG. 2, of the two switching shafts 13 and 14, only the engaging portion 13a of the switching shaft 13 located on the front side with respect to the hook 5b of the lever 5 is used. shows a state in which it is engaged with the hook 5b.

Next, a method for storing the shafts 13 and 14 for changing the length of cable extension, which are the essential parts of this device, will be explained with reference to FIGS. 3 to 7. FIG. 3 is a perspective view showing a state in which the cable 1 is air-wound, and FIG. 4 is a perspective view of a jig shaft.
Reference numeral 15 denotes a jig shaft used for storing the switching shafts 13 and 14 in the cable 1. This jig shaft 15 has an oval cross-sectional shape, and is similar to C in FIG.
It has a structure in which the dimensions are smaller than the D dimension. Further, 15a is a head provided at one end of this oval shaft portion, and serves as a handle when pulling out the jig shaft 15 from the cable 1 after the cable 1 is completely wound.

This jig shaft 15 is shown in FIG.
When the cable 1 is wound to the predetermined position where it is first switched as shown in FIG. It is inserted in the middle of the cable, crossing it in the radial direction. At this time, the jig shaft 15 has its elliptical long axis direction, that is, the D dimension portion in the figure, along the E line connecting the center and the outer circumference of the air-wound cable 1, that is, on the center line. position it like this. Thereafter, the cable 1 is uniformly wound around the jig shaft 15 so as to cover the jig shaft 15. This state is shown in the explanatory diagrams of FIGS. 5 and 6 showing the storage state of the cable length switching shaft, and these diagrams show that the cable 1 is evenly wound around the jig shaft 15. I understand. As shown in FIG. 6, when the cable 1 is wound around the outside of the jig shaft 15 to the next predetermined length, the next jig shaft 15 is treated, and the cable 1 is further wound around the jig shaft 15. It is wound uniformly on the jig shaft 15.

Next, a method of replacing the jig shaft 15 and the switching shafts 13 and 14 will be explained with reference to FIGS. 6, 7, and 8. FIGS. 7 and 8 are explanatory diagrams showing a procedure for replacing the jig shaft and the switching shaft. First, when inserting the switching shafts 13 and 14 into each of the two jig shafts 15 with the two jig shafts 15 wound around each other, the jig shafts 15 should be inserted as shown in FIG. 90 the tool shaft 15 in the direction of arrow E
° Rotate. As a result, gaps a and b are formed around the jig shaft 15 due to movement in the long axis direction, as shown in FIG. can be easily pulled out. Then, the cable 1 from which this jig shaft 15 has been pulled out
As shown in FIG. 8, the switching shaft 13 is inserted into the gap between
and 14 from the lower end thereof in the direction of arrow G. The diameters of the shaft portions of the switching shafts 13 and 14 are set to be the same as or smaller than the short diameter B of the jig shaft 15. Therefore, the switching shafts 13 and 14 can be easily inserted into this gap, and when the lower ends thereof protrude toward the lower pressing plate 4 side, the insertion work of the switching shafts 13 and 14 is completed.

The cable feeding operation of this embodiment with the above-mentioned configuration will be explained below with reference to FIGS. 9 to 12 in addition to FIGS. 1 to 8. FIG. 9 is a sectional view of the switching device showing a case where the feeding length is not switched, FIG. 10 is a sectional view of the switching device showing the case where the feeding length is switched, and FIG. 11 is a sectional view of the switching device when the feeding length is switched. Figure 12 is a partially cutaway view of an air-core wound cable showing a state in which the switching shaft is pulled out and the cable does not stop feeding out, that is, it cannot be switched. It is a cutaway view. First, the length of the cable that is fed out to a predetermined length is switched by operating the lever 5. The lever 5 is movable in the direction of arrow B as shown in FIG.
Since the arm 5c is attached to the mounting plate 12, which is the bottom surface of the base plate 1, the arm 5c is moved in the direction of arrow B so that it corresponds to the locking hole 12b of the mounting plate 12 formed at the position corresponding to the set depth. The lever 5 is fixed in a predetermined position with an appropriate locking force by rotating the lever 5 and fitting it into the locking portion 12b corresponding to the desired depth.

In FIG. 2, the lever 5 has one arm 5.
c shows a state in which the hook 5b of the lever 5 is engaged with the locking hole 12b directly on the side, that is, in the center of the locking holes 12b to 12d. Since the shaft 13 is engaged with the engaging portion 13a of the switching shaft 13 on the near side with respect to the hook 5b, the length of the cable 1 to be fed out is switched to an intermediate length. When the lever 5 is rotated downward and locked with the locking hole 12c, the length of the cable to be fed out becomes the shortest, and when the lever 5 is rotated upward and locked with the locking hole 12d, the cable 1 All the cables are fed out to form the longest cable length.

First, the cable feeding operation will be explained using FIG. 1, FIG. 8, and FIG. 11. In FIG. 1, the arm 5c of the lever 5 is located at the center position with respect to the locking hole 12b, and the engaging portion 13a of the switching shaft 13 is inserted toward the inner side with respect to the winding direction of the cable 1. is engaged with. Next, FIG. 8 shows the operation during operation, and when the cable 1 is fed out, the floating part 11 is
The cable 1, which has its terminal 1a fixed to a certain part stored in the floating part 11, falls off due to the case 10, the entire cable 1 stored in the case 10, and an ocean sensor or weight (not shown). Therefore, when the floating section 11 and the case 10 are separated, the lever 5 attached to the bottom surface of the floating section 11 is also removed from the case 10.
Separate from. Therefore, the switching shaft 13 engaged with the hook 5b of the lever 5 is also pulled out and separated from the case 10, that is, the cable 1, together with the floating portion 11.

Therefore, even if the cable 1 of a predetermined length wound inside the switching shaft 13 is completely unwound, the unwinding operation is not hindered by the switching shaft 13, and the outside of the switching shaft 13 is unwound. The cable 1 wound around is also sequentially unwound to the next switching position, that is, to a predetermined length wound inside the switching shaft 14. Next, the operation of the switching shaft 14 to stop the cable 1 from being fed out will be explained using FIGS. 1, 9, and 10. Lever 5 as shown in Figure 1
When the hook 5b is engaged with the engaging part 13a of the switching shaft 13, the switching shaft 13 is pulled out due to the separation of the floating part 11 from the case 10, but the engagement of the other switching shaft 14 is Since the portion 14a and the hook 5b are not engaged, the switching shaft 14 remains inserted into the cable 1 as it is.

Therefore, when all the cables 1 wound inside the switching shaft 14 are unwound, the cable 1 wound around the outside of the switching shaft 14 also tries to be unwound, but the switching shaft 14 is unwound. The upper and lower sides of the bent cable 1 are radially crossed by both holding plates 3.
, 4, so that when the cable 1 is unwound 5 to 10 times, it winds around the switching shaft 14 in a spiral shape as shown in FIG.
The feeding will stop. Furthermore, when the arm 5c of the lever 5 is turned downward as shown in FIG. The cable 1 remains inserted inside, and when the cable 1 is paid out to the first switching position, and the part wound inside the switching shaft 13 is paid out, the cable 1 outside the shaft is further paid out about 5 to 10 turns. ,
As shown in FIG. 10, this winds around the switching shaft 14 in a spiral manner, and the cable 1 stops being fed out.

On the other hand, when the arm 5c of the lever 5 is rotated upward as shown in FIG. It turns out. Therefore, from the case 10 to the floating part 1
When the cable 1 is detached, both shafts 13 are pulled out at the same time, so when the cable 1 is let out, there is nothing left inside the cable 1 to restrict this, so the entire length of the cable 1 is let out.

[0029]

As explained in detail above, according to the present invention, first, in a cable length switching device, an air-core wound cable is held by a holding plate having a cable feed-out hole in the center from the upper and lower surfaces of the cable. and housed in a case, and a lever having a hook at one end is attached to the bottom surface of a floating part removably fitted to the upper part of the case so as to be rotatable about the cable feeding hole. Attachment: A cable length switching shaft having an engaging part at one end that engages with the hook of the lever is passed through the holding plate vertically so that the engaging part protrudes toward the upper side of the holding plate. The air-core wound cable is arranged so as to cross the circumferential surface of the air-core wound cable to a predetermined length, and the cable is inserted into a plurality of locations corresponding to the required payout length, and engaged with the hook by the lever. By engaging the parts, the cable length switching shaft can be pulled out from the cable by detaching the floating part from the case.

In order to manufacture the above-mentioned cable length switching device, a jig shaft having an elliptical shaft section is attached to the outer peripheral surface of the cable that has been air-wound to a predetermined cable payout length. Place the jig shaft so that the long axis of the shaft is aligned with the center of the air-wound cable, passing it through the holding plate, and then insert the remaining cable through the jig shaft. Once the entire length of the cable has been wrapped, the jig shaft is rotated 90 degrees and removed from the cable. A cable length switching shaft having a shaft portion having a diameter equal to or smaller than the shaft diameter of the tool shaft is inserted so as to penetrate both the upper and lower pressing plates.

[0031] As a result, when the cable is fed out, a predetermined position of the cable is wrapped around the switching shaft and caught, so if the lever is operated in accordance with the preset feeding length, the cable is reliably fed out to the specified length. It becomes possible to switch to a long time. Since the switching shaft only needs to be replaced with the jig shaft, the conventional troublesome work of inserting the switching string from the end is no longer necessary. Furthermore, this jig shaft has an elliptical shaft part, and its long axis is arranged in a straight line with the center of the air-wound cable. °The jig shaft can be easily pulled out by rotating it, and by making the switching shaft the same or smaller in diameter than the jig shaft, the switching shaft can be easily positioned. It turns out. According to this, the assembly work of the cable length feeding device is simplified, and cost reduction can be realized. Furthermore, in the present invention, since the switching shaft crosses the circumference of the air-core winding of the cable, there is no step caused by the switching shaft, and the cable can be wound uniformly on the circumference of the air-core winding. It is possible to prevent steps in the aligned winding of the cable,
This prevents cable winding from becoming disordered. Therefore, it is easy to wind the cable in an aligned manner, and operation reliability when unwinding due to disordered cable winding can be ensured.
The present invention has the effect that it is possible to realize a cable length switching device with high workability and a method for manufacturing the device.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing the structure of a cable length switching device according to the present embodiment.

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a perspective view showing a state in which the cable is wound around an air core.

FIG. 4 is a perspective view of the jig shaft.

FIG. 5 is an explanatory view showing a stored state of the cable length switching shaft, in which (A) is a perspective view, (B) is a side sectional view, and (C) is a bottom view.

6A and 6B are explanatory diagrams showing a stored state of the cable length switching shaft, similar to FIG. 5; FIG.
) shows a side sectional view, and (C) shows a bottom view.

FIG. 7 is an explanatory diagram showing a procedure for replacing the jig shaft and the switching shaft, and FIG. 7A is a perspective view;
B) shows a side sectional view, and (C) shows a bottom view.

8 is an explanatory diagram showing the procedure for replacing the jig shaft and the switching shaft, similar to FIG. 7, in which (A) is a perspective view, (B) is a side sectional view, and (C) is a bottom view. It shows.

FIG. 9 is a sectional view of the switching device when the feeding length is not switched.

FIG. 10 is a sectional view of a switching device when switching the feeding length.

FIG. 11 is a partially cutaway view showing a state in which the cable is wound around the switching shaft.

FIG. 12 is a partially cutaway view showing a state in which the cable extension length cannot be switched.

FIG. 13 is a front sectional view of a conventional cable length switching device.

FIG. 14 is a top view of FIG. 13;

FIG. 15 is a perspective view of a main part showing a stored state of the cable extension length switching string.

FIG. 16 is a perspective view showing problems in the conventional example.

FIG. 17 is a cross-sectional view of FIG. 16;

[Explanation of symbols]

1 Cable 3 Upper holding plate 4 Lower holding plate 5 Lever 5b Hook 5c Arm 10 case 11 Floating part 12 Mounting plate 13 Switching shaft 14 Switching shaft 15 Jig shaft

Claims (2)

[Claims] [Claim 1] An air-core wound cable is held by a holding plate having a cable feed-out hole in the center from the upper and lower surfaces thereof and stored in a case, and the cable is removably fitted to the upper part of the case. A lever having a hook at one end is attached to the bottom surface of the floating part so as to be rotatable about the cable feeding hole, and the lever has an engaging part at one end that engages with the hook of the lever for switching cable length. By passing the shaft vertically through the holding plate with the engaging portion protruding toward the upper side of the holding plate, the shaft is arranged to cross the circumferential surface of the air-core wound cable, and the shaft is placed in a predetermined manner. The cable is air-wrapped to its full length.
The cable is inserted into a plurality of locations corresponding to the required feeding length, and by rotating the lever, the hook of the lever is engaged with the engaging part of the cable length switching shaft, and the floating part is removed from the case. A cable length switching device that switches the length of the cable by making it possible to pull out the cable length switching shaft from the cable by detaching it. [Claim 2] A jig with a shaft portion having an elliptical cross-sectional shape on the outer circumferential surface of the cable, which is held from the top and bottom by a holding plate having a cable feed-out hole in the center and which is air-core wound to a predetermined cable feed-out length. The shaft is placed so that the long axis direction of the shaft part of the jig shaft is located in a straight line with the center of the air-wound cable, and then the remaining cable is inserted. is uniformly wrapped so as to cover the jig shaft, and when all the cables are wrapped, rotate the jig shaft by 90 degrees and remove it from the cable,
In the gap formed after the jig shaft is removed, a cable length switching shaft having a shaft portion with a diameter equal to or smaller than the jig shaft is inserted through both the upper and lower holding plates. A method of manufacturing a cable length switching device, characterized in that the device is inserted as shown in FIG.