JPH0134906B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spiral core manufacturing apparatus, and its gist is that a fixed rotating roller 1 and a movable rotating roller 2
An endless belt 3 is installed between the belt 3 and a cutting device 14 that cuts the long sheet 4 into a certain length, and the cut sheet 4 for the spiral core is wound between the endless belt 3 and the sheet 4 to give a curvature. The core manufacturing pin 5 is pressed against the endless belt 3, and the movable rotary roller 2 is moved toward or away from the core manufacturing pin 5 almost simultaneously with the winding of the sheet 4, thereby causing the core manufacturing pin 5 and the endless belt 3 to The apparatus for manufacturing a spiral core comprises a movable rotary roller 2 attached to an approximation/separation device 6 that gradually changes the contact angle α in synchronization with a cutting device 14.

Conventionally, hollow panels were manufactured by assembling crosspieces in a roughly square shape and pasting face plates on both sides of such a peripheral frame, but a spiral was used as a core material to maintain the distance between the face plates by interposing a large number of them between the face plates. When manufacturing a spiral core by winding a sheet to give it curvature,
As shown in FIGS. 1 and 2, the core manufacturing pin 5'
The sheet 4' is wound between the belt and the endless belt 3' to give it a curvature. However, in this method, the beginning and end of the sheet 4' winding have the same curvature, and the spiral core If the diameter of the sheet 4 and the length of the sheet 4 are larger than a certain size, even if a spiral core A' of a larger size is made, the sheet 4
overlap at the final end, and the spiral core
A′ does not become large (i.e. core area is small)
There was a drawback. This is because the contact angle α between the core manufacturing pin 5' and the endless belt 3' is constant, so the curvature is constant. Therefore, if the core diameter becomes large, the sheet 4' will not be able to hold even if the core diameter is increased beyond a certain level. They will overlap at the final end.

The present invention has been made in view of the drawbacks of the conventional examples, and its purpose is to increase or decrease the curvature of the sheet as it moves from the leading edge to the trailing edge, so that the length of the sheet increases. ,
To provide a manufacturing device for a spiral core in which sheets do not overlap at the final end even if the core diameter becomes large.

The present invention will be described in detail below with reference to illustrated embodiments.
The endless belt 3 is installed between a fixed rotating roller 1 and a movable rotating roller 2 so as to be rotatable in one direction. 7
A tension wheel applies constant tension to the endless belt 3. 8 is a take-up device, which has a front drum 9 and a rear drum 1.
A take-off belt 11 is installed between the 0 and 0, and a tension wheel 12 applies a constant tension to the take-off belt 11. Reference numeral 13 denotes a take-up drum, which is rotatably arranged on the rear drum 10. 14 is a cutting device, and rotary blades 16 are installed at two locations symmetrically around a large sprocket 15. 17 is a cutting table that comes into contact with the rotary blade 16. Further, a small sprocket 18 having half the number of teeth of the large sprocket 15 is disposed below the cutting device 14, and a cam 19 is coaxially connected to the small sprocket 18.
is installed. Reference numeral 6 denotes a proximity/separation device, which is slidably supported by a slide bearing 20, one end of which contacts the cam 19, and the other end of which is connected to a swing lever 2, which will be described later.
1, a swinging lever 2 having one end pivotally supported, the other end being attached to the slide shaft 22, and a movable rotating roller 2 attached near the pivoting end.
It consists of 1. When the sheet 4 is supplied, it is conveyed rearward on a take-up belt 11, and is then sandwiched between a take-up drum 13 and a rear drum 10 via the take-up belt 11 and sent rearward. At this time, the rotary blade 16 is connected to the large sprocket 1.
When the sheet 4 rotates with the rotation of the blade 5 and reaches a certain size, it is sandwiched between the rotary blade 16 and the cutting table 17. The cut sheet 4 is further sent backwards, contacts the endless belt 3, is sent slightly in the direction of rotation of the endless belt 3, and is then bitten by the core manufacturing pin 5 and the endless belt 3 and bent into a spiral shape. This will be Core A. Here, the rotational force of the large sprocket 18 is transmitted to the small sprocket 18 by the action of the chain 24 installed between the small sprocket 18 and the large sprocket 15, and the cam 19 rotates together with the small sprocket 18, and the slide shaft 2
Slide 2. This slide shaft 22 then moves the swing lever 21 in one direction, causing the movable roller 2 to move away from the core manufacturing pin 5. This series of operations is all synchronous, and at the same time as the sheet 4 is sandwiched between the core manufacturing pin 5 and the endless belt 3, the movable rotating roller 2 is sequentially separated from the core manufacturing pin 5 (of course, in the approaching direction). ), and the contact angle between the core manufacturing pin 5 and the endless belt 3 gradually increases from α ₁ → α ₂ (if they are close to each other, the contact angle decreases from α ₂ → α ₁₎ . curvature given to the sheet 4 also increases.

Since the present invention has the above-mentioned configuration, the curvature of the ejected sheet increases sequentially at each location, making it possible to obtain an accurate spiral core. Since they are the same, the sheets do not overlap at the end, and there is an advantage that such a spiral core can be automatically manufactured from a long sheet.

[Brief explanation of drawings]

Figure 1 is a schematic front view of the conventional example, Figure 2 is the 11th
The enlarged view of the X part shown in the figure, FIGS. 3a and 3b are a plan view and a front view of the spiral core formed in the conventional example,
FIG. 4 is a schematic front view of one embodiment of the present invention, FIG. 5 is an enlarged view of the Y section of the same, and FIGS. 6 a and b are a plan view and a front view of a spiral core formed according to the present invention. 1 is a fixed rotating roller, 2 is a movable rotating roller,
3 is an endless belt, 4 is a sheet, 5 is a core manufacturing pin, and 6 is a separating device.

Claims (1)

[Claims] 1. An endless belt is installed between a fixed rotating roller and a movable rotating roller, and the sheet for the spiral core that has been cut by a cutting device that cuts a long sheet into a certain length is wound between the endless belt and the curvature of the sheet. The cutting device presses the core production pin against the endless belt and moves the movable rotating roller toward or away from the core production pin almost simultaneously with the winding of the sheet to adjust the contact angle between the core production pin and the endless belt. A spiral core manufacturing device comprising a movable rotating roller attached to a proximity/separation device that changes gradually in synchronization with the