JPH0741749B2 - Method and device for removing tail of thread from booklet - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for removing a tail of a booklet stitched with a sewing machine thread when binding a booklet such as a bank passbook, a passport or a notebook. .

Prior art When binding a thread-bound booklet, the sewing machine is operated continuously, so the leading booklet and the trailing booklet on the bookbinding line are connected by continuous sewing thread, and the booklets are separated after sewing. The process of removing the thread tail is essential. When the thread tail remains and is applied to a cover in a subsequent process, the thread tail wraps around the inner surface of the cover and is attached together with the cover, and a defective product is discharged.

Conventionally, as a method of removing the thread tail, a method of manually cutting the thread tail with scissors, a method of burning it off by a flame, or a method of cutting off the thread tail by cutting off a booklet.

Problems to be Solved by the Invention Therefore, the method of manually cutting the thread tail with scissors or burning it off with a flame is inefficient, and it is difficult to remove it beautifully. Contradiction.

In addition, the method of removing the tail end of the booklet after sewing with the sewing machine loses the reference plane that has been pre-cut to an accurate dimension and is parallelized due to the end edge for removing the tail end. It will be an obstacle to attaching the cover. Further, when a mark indicating the direction of the booklet is attached to the corner portion of the booklet, there is a problem that the mark is cut off by the edge cutting, and further it is difficult to secure a sufficient margin for finishing the edge after attaching the cover sheet. There are problems such as.

The present invention is provided for the purpose of solving the above problems.

Means for Solving the Problems As a means for achieving the above-mentioned object, the present invention has a method in which a leading booklet and a succeeding booklet are bound with a continuous sewing thread, and then a circle is formed at the start and end of the thread of each booklet. This method adopts a method of removing the tail of the thread by making a notch cut such as an arc shape or a triangle.

Further, the present invention provides a punching device as a means for performing the notch cut, wherein the upper blade has a cutting edge having a cylindrical shape, and the lower blade has a cutting edge having an arc shape having a curvature in synchronization with the cylindrical upper blade. To do.

Action A sewing operation is continuously performed on the booklets provided one after another on the transport path, and the booklets are bound by the sewing thread so that the booklets are connected to each other by the sewing thread.

According to the present invention, a sewing thread that connects each booklet is cut and separated, and then a notch cut is made at the start and end of the thread, or the notch cut is performed in a state where each booklet is connected by the sewing thread. Unlike the method in which the trailing edge is removed and the booklet is cut off and the thread trailing edge is removed, effective thread trailing edge removal can be performed while leaving the pre-cut reference surface.

In addition, since the extreme end of the booklet end surface (reference surface) where the tail of the thread is released is notched, the reference surface can remain as described above, and it is possible to secure a sufficient margin of finishing edge after attaching the cover sheet, and further to the booklet corner portion. Even if a sign such as a direction indicator mark is attached, there is no risk of cutting it off.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

The booklet 1 in which the leaves are flatly stacked is accurately preliminarily cut in the previous step to have its dimensions set and parallelized, and the booklet 1 is flat-fed one after another on the conveying path and used for thread binding by the sewing machine 2. The booklets 1 are bound together along the center line and are connected to each other by continuous sewing threads.

After the sewing machine is hooked, the sewing thread cutting unit 3 is used.
The sewing thread connecting the booklets 1 is cut to separate the booklets. As a result of this separation, the tail end 5 of the booklet 1 is released in a whisker shape from the beginning and end of the thread 4.

The thus-separated booklets 1 are supplied to a punching device 6, and the thread tail 5 is removed by making notch cuts 13 having an arc shape, a triangle shape, a quadrangle shape or the like at the beginning and the end of the thread 4.

As shown in FIGS. 4 and 5, the punching device 6 comprises an upper blade 7 and a lower blade 8. The upper blade 7 has a cylindrical cutting edge 7a, and the lower blade 8 has a cylindrical cutting edge 7a. It has an arcuate cutting edge 8a having a synchronized curvature.

The lower blade 8 has a double-blade structure having the arcuate blade edge 8a facing the back and the belly, and has a cocoon-shaped plate shape.

The lower blade 8 is fitted into the lower blade holding groove 9a of the holder 9 and screwed, and the lower blade holder 9 is held by the base 10 having a through hole 10a concentric with the upper blade 7, By loosely inserting the fixing screw 11 standing on the base 10 into the long hole 9b formed in the holder 9, the holder 9 and the lower blade tip 8a are inserted into the upper blade through hole.
It is possible to eject or retreat toward 10a, and as a means for performing the ejection, an adjusting screw 12 is provided on the base 10 and the adjusting screw 12 is provided.
Is abutted against the rear end of the holder, and the holder 9 is advanced and retracted by the rotation of the adjusting screw 12, and the fixing screw 11 is tightened and fixed at a predetermined position. The lower blade 8 is made of a soft metal such as a copper alloy, and when the upper blade 7 is lowered and inserted into the through hole 10a, the lower blade 8 is pushed out to the edge of the through hole 10a.
The blade edge 8a of is cut by the upper blade 7, and the lower blade 8 is attached. When the lower blade 8 is worn, the blade tip is regenerated by performing the above-mentioned blade attachment. Further, the lower blade 8 has a double-blade structure and can be inverted for repeated use, and the upper blade 7 can be repeatedly used by rotating when the blade edge wears.

Thus, by lowering the upper blade 7, notch cuts 13 are formed in an arc shape at the start and end of the thread 4 of each booklet 1, and the thread tail 5 is cut together with the notch cut piece 13a.

The outlet side (lower end) of the through hole 10a communicates with the suction hole 14 connected to the vacuum device, and the notch cut piece 13a notched by the upper blade 7 and the lower blade 8 is collected by the suction hole 14. To do.

The length of the above-mentioned booklet 1 in the feeding direction is set to one unit, one set, two sets, or three sets.
After making notch cuts 13 on both ends of the thread 4, the thread 4 is glued from the back of the booklet along the thread 4 while being conveyed to a gluing device 15 using a gluing nozzle or the like, and the thread 4 is fixed with an adhesive. The sheet is conveyed to the sticking section 18 and the cover is stuck. 16
Is a cover sheet, and the cover sheet is fed out at a speed synchronized with the conveyance of the booklet 1 by the sizing roller 17 and sizing.
Affixed to the back of. Alternatively, it is used for attaching a cover sheet without gluing the thread 4 described above.

After pasting the cover sheet, it is provided to the drying section 19 to dry the glue,
Further, the booklet 1 is used for any folding part 20 and is folded in two along the perforations.

The above-mentioned fold is, for example, two rolls 21 that are parallel to a booklet.
And the folding plate 22 is lowered along the yarn 4 so as to intervene between the rolls 21 and 21.

Thus, the fold-folded booklet 1 is provided to the press portion 23 to surely give a crease.

After that, the booklet is provided to the finishing edge cutting section 24, and the edge cutting cutter 25 performs the finishing edge cutting of the long side and the finishing edge cutting of the short side to cut off the notch cut 13 together with the edge cutting piece 27. At the same time, it is cut into a plurality of booklets 1'by the separate cutter 26 and used for the next step.

As described above, the booklet 1 to be hung on the sewing machine has the outer dimensions accurately set and parallelized, and has the margins a and b after the cover is attached as shown in FIG. Accordingly, the notch cut 13 has a sign c such as a direction indicating mark at the corner portion, and as shown in FIG. 3, the notch cut 13 is at the start and end of the yarn 4 of the booklet 1 bound in the thread within the range of finishing allowance. The notch cut 13 is cut off by cutting off the finishing allowances a and b at the finishing cutting edge 24.

EFFECTS OF THE INVENTION According to the present invention, there are problems of the method of removing the yarn tail by cutting off the selvages, for example, removing the reference surface, it is difficult to secure a sufficient finishing selvage cutting margin, removal of marks, etc. The problem is solved, the reference surface remains as it is, and the finishing edge margin is secured, there is no fear of cutting marks, and proper tail removal can be performed by notch cutting, and notch cutting is also finished. The position and size are relatively rough as long as they are within the margin, and the thread tail can be easily removed.

[Brief description of drawings]

FIG. 1 is a perspective view which outlines an embodiment of the method for removing the tail end of a thread binding booklet and an apparatus according to the present invention, FIG. 2 is a plan view of a booklet used for sewing, and FIG. 3 is a notch. FIG. 4 is a plan view of the cut booklet, FIG. 4 is a perspective view of a punching device for making a notch cut, and FIG. 5 is a sectional view of the same. 1 ... booklet, 2 ... sewing machine, 3 ... splicing thread cutting section, 4 ...
... thread, 5 ... thread tail, 6 ... punching device, 7 ... upper blade,
7a: Cylindrical cutting edge, 8: Lower cutting edge, 8a: Circular cutting edge, 13
...... Notch cut, 13a …… Notch cut piece, 16 …… Cover, 24 …… Finishing edge cut.

Claims (4)

[Claims] 1. A leading booklet and a trailing booklet of a sewing thread of each booklet after the preceding booklet and the following booklet are bound with a continuous sewing thread and the sewing thread connecting the booklets is cut and separated. A thread tail removal method for thread binding booklets, in which a notch cut is applied to the thread tail to remove the thread tail. 2. A leading booklet and a trailing booklet are stitched with a continuous sewing thread, and then, in a state in which the respective booklets are connected with the sewing thread, at the beginning and end of the thread of the sewing thread of each booklet. A method for removing the tail of a booklet that does notch cutting to remove the tail. 3. A punching device for removing a yarn tail by notching a start and an end of a stitch of a booklet bound in a yarn, comprising an upper blade and a lower blade, the upper blade having a cylindrical cutting edge. ,
A punching device, wherein the lower blade has a cutting edge having an arcuate shape having a curvature in synchronization with the cylindrical upper blade. 4. The punching device according to claim 3, wherein the lower blade is made of a soft metal.