JPS6348607B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a tension reel mandrel for winding a strip.

(Prior art) Conventionally, when changing the inner diameter of a strip coil during strip winding work, multiple attachments were attached and detached using bolts to the drum circumference of a tension reel mandrel with the drum diameter set to the minimum working range. This problem is solved by forming auxiliary segments that are freely fixed and increasing the diameter of the drum.

By the way, to fix the strip tip to the mandrel, the strip tip is held by swingable grip segments provided on the mandrel, and the same method is used when attaching the auxiliary segment for expanding the drum diameter. I'm going.

(Problems to be Solved by the Invention) However, when winding the strip 20 with the auxiliary segment 11 attached, the tip of the strip must be pulled into the grip segment of the mandrel 1, as shown in FIG. Compared to the state in which no auxiliary segment is attached (see FIG. 4), the gripping allowance 21 of the strip becomes larger, and as the diameter becomes larger, the loss of the strip increases. Furthermore, if this gripping allowance 21 becomes larger than a certain level, it will be difficult to install the payoff reel, so after pulling out the strip coil from the tension reel, the gripping allowance must be cut with gas or bent, making the work complicated. There was a problem.

(Means for Solving the Problems) The present invention has been developed in view of the above-mentioned problems, and its purpose is to provide a grip mechanism for holding the tip of the strip in the auxiliary segment, thereby providing a gripping margin when the inner diameter of the strip coil is expanded. The purpose is to minimize the amount of grip and eliminate the need to handle the gripping margin after winding work.

The invention according to this application provides a tension reel mandrel in which an auxiliary segment is removably fixed to the drum peripheral surface of the tension reel mandrel, in which two grip attachments are integrated with grip segments attached to the mandrel. By fixing the grip to the handle and making at least one of the grip attachments swingable, by forming a grip groove in the abutting portion of both grip attachments, and providing a grip member in the grip groove, This achieves the above objective.

In the above configuration, the grip member is formed by opposing semicircular cams biased by a spring.

(Example) FIGS. 1 to 3 show an example of the present invention.

Reference numeral 1 in the figure indicates a mandrel, and the mandrel 1 is composed of a push-pull rod 2, a sleeve 3, and segments 6 and 8. A push-pull rod 2 is fitted into the center of the sleeve 3, and is also inserted at a predetermined position on the outer circumference of the sleeve 3 (4 in the figure).
A wedge bar 4 that is continuous in the axial direction is attached to this part. Further, on the circumferential surface of the sleeve 3, there are a plurality (three in the figure) of enlarged diameter segments 6 which are biased in the axial direction by a disc spring 7, and whose rotation center is supported by a support shaft 9, with a compression spring 10 between them. Two opposing grip segments 8 are attached via. A grip bar 5 is disposed between the wedge bar 4 and the enlarged diameter segment 6 and between the wedge bar 4 and the grip segment 8, and as the wedge bar 4 moves, the enlarged diameter segment 6 moves in the radial direction. The grip segment 8 is adapted to swing.

The mandrel 1 having the above configuration includes a plurality of (three in the figure) diameter expansion attachments 12 and two
An auxiliary segment 11 consisting of two grip attachments 13 is removably attached.
The enlarged diameter attachment 12 is attached to the outer periphery of the enlarged diameter segment 6, and the grip attachment 13 is attached to the outer periphery of the grip segment 8 with a bolt 14.
Fixed by Clamping grooves 15 are formed in the abutting portions of both grip attachments 13, 13, respectively, and grip members 16 are attached to each clamping groove 15. This grip member 16 uses a cam which is biased by a torsion spring 17 and has a semicircular tip.

(Operation) The operation of the present invention will be explained below based on the drawings.

In FIG. 1, the grip bar 5 moves in the direction A←→B, and in response to this movement, the grip segment 8 moves in the direction C←→D. and a grip attachment 13 fixed to the grip segment 8.
moves in the E←→F direction similarly to the grip segment 8.

When inserting the tip of the strip 20 between the grip attachments 8, 8, the grip bar 5 is moved in the direction A and the compression spring 10 is used to swing the grip segment 8 in the direction C.
Each grip attachment 13 is moved in the E direction to create a gap, and the strip 20 is inserted into this gap.
Insert the tip of the holder and hold it between the grip members 16, 16.

After the tip of the strip 20 is inserted, the mandrel 1 is expanded in diameter by moving the grip bar 5 in the B direction and pushing out the expanding diameter segment 6. At this time, the grip segment 8 swings in the D direction. In conjunction with this, the grip attachment 13 also swings in the F direction. Therefore, the tip of the strip 20 is clamped by the tip of the grip attachment 13, and is further clamped doubly by the grip member 16, so that the tension generated at the start of winding due to the starting torque of the mandrel 1 is applied. , the tip of the strip 20 is designed so that it will not come off.

(Effects of the Invention) Since the auxiliary segment is provided with a grip mechanism for holding the tip of the strip, the gripping margin for the strip can be kept to the necessary minimum, and there is no need to dispose of the gripping margin after the winding operation.

For the same reason, the strip winding operation when using the auxiliary segment can be easily and reliably carried out in a short time.

The grip mechanism has a double structure consisting of the tip of the swingable grip attachment and the grip member attached to the gripping groove of the grip attachment, so the tension at the beginning of winding is This prevents the tip of the strip from coming off.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, FIG. 2 is a longitudinal sectional view, and FIG. 1 is a cross-sectional view of FIG.
Line sectional view, Figure 3 is a line arrow view of Figure 1, Figure 4
FIG. 5 is a schematic diagram showing a conventional example. 1... Mandrel, 2... Push-pull rod, 3... Sleeve, 4... Wedge bar, 5... Grip bar,
6... Expanded diameter segment, 7... Belleville spring, 8... Grip segment, 9... Support shaft, 10... Compression spring, 11
...Auxiliary segment, 12...Diameter expansion attachment,
13...grip attachment, 14...bolt,
15... Holding groove, 16... Grip member, 17... Torsion spring, 20... Strip, 21... Grip allowance.

Claims (1)

[Scope of Claims] 1. In a tension reel mandrel that removably fixes an auxiliary segment to the drum peripheral surface of the tension reel mandrel, two grip attachments are each integrated with the grip segment of the tension reel mandrel. fixing the grip to the grip attachment so that at least one of the grip attachments can swing, and forming a clamping groove in the abutting portion of both grip attachments;
A tension reel mandrel characterized in that a grip member is provided in the holding groove. 2. The tension reel mandrel according to claim 1, wherein the grip member is formed by opposing semicircular cams biased by a spring.