JPH06315906A - Staple bending mechanism for power paper binder and paper binding method - Google Patents

Abstract

PURPOSE: To safely and surely staple documents by putting the apexes of staples into the bottom face of the documents and processing it. CONSTITUTION: A power stapler is provided with a stitcher head for driving a staples into a stack of papers and a clincher head 70 provided against the sticher head and clinching the apexes of the staples. The clincher head has a pair of clinching parts 46 pivoted on the mutual outsides and rotated toward the inside upward for stapling mutually inward two staple apex parts projected from the bottom face of a stack of papers. Between an opposite face of the bottom face of the stack of papers of the clincher head and the top face of the clinching parts, a specified angle A1 being more gentle than the conventional angle is set. Guide channels for staple end parts inclining by a specified angle from the direction intersecting at right angles to the shaft are formed on the top face of the clinching parts. The clinching parts clinch the staples at a position being close to the bottom face of the stack of papers and without rotating much excessively. Stapling is performed thereby in such a way that the apexes of the staples is put into the bottom face of the stack of papers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power-type paper binder (power stapler), and more particularly to improvement of a mechanism for bending a staple tip of a paper binder.

[0002]

BACKGROUND OF THE INVENTION Powered paper binders driven by pneumatic and / or electric actuators are widely used for organizing documents and making booklets. Copiers and laser printers often incorporate a power-type paper binder or a "needle-type binding mechanism" in order to arbitrarily bind completed documents.

FIG. 9 is a typical example for realizing the power binding device 10. A set of printed documents 12 is fed to the binder 14 one at a time or as a bundle (as shown). The binding device 14 itself is configured by a paper binding mechanism that is driven electromechanically and / or pneumatically as shown schematically. For example, "Owner Universal 52/8" (Hohner Unive
Known paper binders such as rsal 52/8) are planned. However, the principle of the present invention can be applied to all existing known paper binding mechanisms. Paper binder 1
4 cuts the needle wire 20 supplied from the supply coil 18 into a desired length by a conventional method to form a wire needle or "binding needle" 16 as illustrated. The binding needle 16 is driven as shown by an arrow 22 by the reciprocating motion of the piercing head 24, and is driven into a predetermined position of the stack of documents 12 such as the upper corner portion shown in FIG. In this example, a bending head 26 driven by air pressure is provided at a position facing the piercing head 24. Once the binding needle 16 penetrates the bundle of paper, both ends of the binding needle 16 are bent by the bending head 26 from the inside of the needle toward the upper side. The documents after being bound are taken out to the take-out stand 28 as shown in FIG. On the opposite side of the piercing head 24 is provided a pneumatically driven folding head 26 in the example shown. The folding head 26 bends both tips of the needle 16 inward when the tip of the needle completely penetrates the sheet bundle. The paper bundle bound by the paper binder is sent to the takeout stand 28 shown in FIG.

10 and 11 to 13 show a more detailed folding head in the prior art. The bending head 26 is composed of a pedestal 32 that can include two core pieces 34 along both sides of the head 26 and an outer plate 36 screwed to the core pieces 34, and a hollow space is provided between the core pieces 34. An internal groove member 38 is provided. The lower side of the groove member 38 is formed in a substantially rectangular shape, and a cylinder rod 40 which is generally made of hardened hard iron is slidably provided between the core pieces 34, 34. ing. This rod 40 is provided with a groove member 3 as indicated by a double-headed arrow 41.
It can reciprocate along 8. The rod 40 is connected to a pneumatic actuator 30 which moves the rod 40 by applying pressure. The paper binder according to the present invention includes a timing control circuit or controller 43 (schematically illustrated in FIGS. 9 and 10) that controls timings such as needle formation, needle penetration, and needle bending. Generally, needle bending is the final operation of the paper binding process. A valve 42 provided on an air pipe 44 communicating with an actuator connected to a timing control circuit controls the supply of air to the actuator 30.

The cylinder rod 40 is for operating a pair of bending portions 46 located at the uppermost end of the bending head 26. The fold 46 is located on the shaft 48 and between the skins 36 and, in this example, has a flat upper surface 50 in which a groove 52 for guiding the needle tip. Are formed. The bent portion 46 has its upper surface 50 fully retracted at an angle A with the flat upper surface 54 of the bending head 26, and the upper surface 50 is the head upper surface 54.
A rotary movement is carried out about the axis 48 between the two positions, which are a position which completely projects beyond the position (shown by a dotted line in FIG. 10). The bent portion 46 according to this example can be taken out by rotating it upward from the head surface by aligning the cutout portion 56 at the rear portion of the bent portion with the thin cross section of the rectangular shaft 48. However, it is not necessary to take out the bent portion 46.

In the completely retracted state (shown by the solid line in FIG. 10), the cylinder rod 40 is substantially in no contact with the bent portion 46.
0 and the bent portion 46 are completely stored in the bending head 26, and the angle of the upper surface at this time is defined by A in FIG. The cylinder rod 40 can be extended by the operation shown by the wire drawing (dotted line), so that the bent portion 46 is projected from the upper surface 54 of the head 26.
In fact, as shown in FIG. 9, the piercing heads 24 provided opposite to each other limit the outward extension of the bent portion 46. This will be described in more detail with reference to FIGS. 11 to 13.

In FIG. 11, the needle 16 penetrates the sheet bundle 12 by the piercing head 24 (arrow 60), and both tips 62 of the needle reach the opposite side of the sheet bundle and reach the upper surface 50 of the folding portion 46. Driven until touched. Since the fold 46 is retracted and the cylinder rod 40 has not extended to the point of contact with the fold 46, the needle tips 62 remain relatively straight at this point.

FIG. 12 shows the needle 1 with the piercing head 24.
6 shows the next step which is further driven. Cylinder rod 40 extends upward (arrow 63) and pivots toward both needle tips, as indicated by arrow 64. Therefore, both tips 62 of the needles bend along the bottom surface 66 of the sheet bundle 12 until they are parallel to the bottom surface 66 of the sheet bundle 12. At this time, as shown in FIG. 13, the sheet bundle 12 is securely bound by the needles 16 and ready to be discharged from the piercing mechanism.

The excellent storage state of the folded portion 46 shown in FIGS. 10 and 11 to 13 is parallel to the state of the bottom surface 66 of the sheet bundle 12 and is parallel to the direction in which the needle 16 is stuck. The tip 62 is bent at a right angle (see FIG. 13). In this way, the tip ends 62 of the bent needles are formed by a manual paper binder in which the leading ends 68 of the bent tip ends 62 are stuck in the bottom surface of the sheet bundle or stuck in the surface. Is different from. Actually, the two parallel tips 62 of the needle tips formed by the power-operated paper binder are caught on clothes, often become a prick that scrapes and cuts the skin of a person, and is not sufficiently bent. , The bound documents are peeled off from the bottom side, and the binding is broken.

[0010]

As described above, in the conventional power-operated paper binding device, both ends of the needle are bent substantially at right angles to the direction in which the needle is pierced, so that the human body is damaged. In addition, there is a risk that the clothes may be damaged, and that the documents may not be bound properly because they have not surely cut into the documents.

In order to solve the above-mentioned problems, the present invention provides an improved needle bending mechanism for forming the tip of the binding needle so that the needle tip surely bites into the bottom surface of the sheet bundle. It is an object of the present invention to provide a power-type paper binder capable of surely binding documents. Another object of the present invention is to provide a paper binder capable of binding a bundle of papers having different thicknesses due to the difference in the number of pages without adjusting the length of the binding needle.

[0012]

SUMMARY OF THE INVENTION A needle bending mechanism for a power binding device according to the present invention has a piercing portion for penetrating a bundle of paper and a folding portion for bending the tip of the pierced needle. It is equipped with a head. Therefore, when the needle is pierced into the stack of paper, both tip portions of the needle come into contact with the folding portion partially stored in the folding head. The angle of the position when the bent portion is partially retracted and stopped is such that when both ends of the needle come into contact with the groove surface of the bent portion, the two needles are bent inside each other. The groove formed on the surface of the bent portion is 2 of needles that are bent along this groove.
The two tips are slanted so that they are guided so that they do not interfere with each other. Accordingly, even if the needles have a predetermined length in which the needle tips normally interfere with each other, they can be used without worrying about the interference of the needle tips.

In the paper binding method using the bending mechanism of the tip of the needle, in the pre-bending step which is the final step, when the bending portion is extended, both tips of the needle bent inward are formed into a paper bundle. Bite inside the back surface of the
The stapled sheets are in the same state as the stapled sheets by the manual stapler (stapler-trademark-, stapler). Therefore, it is possible to provide a highly safe paper binding method without damaging the fingertips or catching clothes, and it is possible to ensure the bound state of the paper bundle, which also contributes to the improvement of reliability. can do.

[0014]

In the preferred embodiment of the present invention in which the bending portion is operated by the cylinder rod, it is also possible to provide a stop member in the long groove provided in the cylinder rod. The long groove is provided in consideration of the size and arrangement that prevents the rod from retracting so that it is located on the cylinder rod with the bent portion partially retracted. It is set so that it cannot be completely stored in the bending head. Therefore, it is possible to freely set a desired angle such that both tip portions of the needle can be directly bent and formed inward.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment of the needle bending mechanism for a power binding device according to the present invention, which has substantially the same configuration as that of the conventional needle bending mechanism shown in FIG. Therefore, the same components as those in FIG. 9 will be assigned the same reference numerals and overlapping description will be omitted. The piercing head 24 cuts and bends the wire 20 to form the needle 16, and pierces the paper bundle 12 by piercing it. In this embodiment, the piercing head 24 is used to
However, the present invention is not limited to this, and the position of the folding head 26 can be freely set in other embodiments. Here, "above" and "below" do not refer to the position of each component with respect to the ground, but to the position of the folding head with respect to the surface 54.

FIG. 2 is an improvement of the conventional folding head 26 shown in FIG. 10. The folding head 70 according to this embodiment limits the retraction of the folding portion 46. Therefore, in the retracted state, the angle A1 formed by the upper surface 50 of the bending portion 46 and the surface 54 of the bending head 70 is smaller than the angle A in FIG. In FIG. 2, such an angle reduction is easily realized in this embodiment by forming a long groove 72 in the bending cylinder rod 74 and providing a bolt or pin 76 slidably fitted therein. it can. The pins 76 are held by a head skin 78 having holes. The end edge 80 of the long groove 72 on the actuator 30 side is set so that the cylinder rod 74 can be extended to the maximum (as shown by the dotted line), but the end edge 82 of the long groove 72 is drawn in the cylinder rod 74. Is set to limit. The retraction of the rod 74 is limited such that the fold 46 remains in contact with the edge 84 of the rod 74 and forms an angle A1 with it.

The cylinder rod 74 in this embodiment prevents the bent portion 46 forming an angle A1 with the surface 50 from being pulled in more than necessary, but restricts the pulling in of the bent portion. For this purpose, other configurations may be used. For example, each bent portion 46 is provided with a pin or bolt that restricts each pull-in, or a predetermined corner portion is provided at the lower end 86 of the bent portion, and this corner portion engages with the extended upper end of the core piece 34. By doing so, the regulation may be blocked. Although detailed description is omitted in the drawings, in short, the bent portions 46 and 46 are arranged to maintain the angle A1.
Any method can be implemented as long as the angular position of is regulated. In this embodiment, the angle A1 is the needle 1
6 is set to a certain value as a result of trial and error over and over so that the tip 62 of 6 is formed in an optimum shape.
This angle A1 is optimum for forming the tip portion 62 of the needle into a shape as shown in FIGS. 5 to 8 as described later.

Since the thickness of the sheet bundle changes, it is generally desirable to change the length of the needle as well. When the needles have the same length in this manner, as shown in FIG.
This corresponds to the case where the needles are bent at 5 intervals, and the tips of the needles do not interfere with each other. If there is no gap, the tips of the normal needle are collinear (eg, in the embodiment shown in FIGS. 1 and 2, along the line orthogonal to the axis 48 of the fold). The two ends of the two extend in a direction in which they interfere with each other and collide with each other, resulting in defective binding. Therefore, the bent portion 46 according to this embodiment has the structure shown in FIG.
As shown in FIG. 2, both have the groove 52a which inclines. Since each groove 52a is inclined at the same angle B,
The parallel lines do not form the same line, and both tips of the needle bent along the groove 52a are displaced by a predetermined angle, so that they do not interfere with each other even if the tip of the needle is long. Absent. FIG. 4 shows this state, and the length of the needle 89 is not restricted even when the document bundle 87 is extremely thin. Therefore, in the conventional bent portion in which the groove is provided along a common single line (on the same straight line), both ends of the needle collide with each other, while the needle is formed with an angle as in this embodiment. By providing the groove 52a, the two tips 91 do not collide with each other when the needle tip is bent and do not interfere with each other.

Here, regarding the operation of the binding device according to this embodiment, FIG. 5 shows the operation of the needle 16 penetrating the sheet bundle 12. The piercing head 24 is above the bending cylinder rod 74 in a state in which it is not retracted as compared with the state shown in FIGS. 11 to 13, and the tip portion 62 of the needle 16 contacts the retracted bending portion 46. Sometimes the piercing head 24 is still in the needle driving (arrow 60) stage. In this manner, the tips 62 of the needles 62, 62 start to be bent in the mutual direction (arrow 88) along the slightly inclined surface of the bent portion upper surface 50.

When the needle 16 is completely driven into the stack 12 up to the top as shown in FIG. 6, the tips 68 of both ends 62 are bent to some extent toward the bottom side of the paper. The bent portion 46 has not moved upward because it has not yet received the force of the cylinder rod 74, but at this point it is in contact with the rod 74 and is in a stopped state. The reason why the tip portion 68 of the needle is slightly bent is that, unlike the conventional example of FIG. 10, the angle A1 (see FIG. 2) of the bent portion 46 of this embodiment, which is not in the retracted state, is This is because the tip portion 68 of the needle 16 is bent so that a force larger than the wire elastic limit of the needle is applied to both end portions 62.
Fully retracted fold 46 as shown in FIG.
Although it is possible to slightly bend both ends 62, this bending does not exert force beyond the wire elastic limit of the needle. Therefore, only the final bending step (FIG. 12) plastically deforms the wire shape of the needle. Thus, this final folding step (FIG. 12) moves the needle 16 approximately 90 degrees from the point where the needle tip on the bottom surface 66 of the stack of paper was projected.
It will be bent every time. On the contrary, in this embodiment, the plastic deformation of both tips 62 starts before the bending portion 46 in the bending process takes any action. This angle A1 ensures that the bending of the end portion 62 causes the tip 68 of the needle to return inward in the direction of the bottom surface 66 of the stack of paper.

When the folding process by the folding section 46 is performed as shown in FIG. 7, the tips of the needles folded inward are urged so as to be returned into the bottom surface of the sheet bundle 66.
Thus, as shown in FIG. 8, the tip of the needle has an inwardly bent needle end portion 6 as in the conventional manual operation.
Form 2. The tip 68 bent inward does not catch human skin or clothes, and further securely binds the bundle of paper. The folds 46 according to this embodiment are angled to form the needle end 62 so that it folds as much as possible, but the wire forming some needles is more plastic than others. It may be difficult to deform. Thus, the angle A1 is at least required to be sufficient to cause a slight plastic deformation of the needle end 62. The inward folding of the needle 16 does not have to be asserted to have the desired result. The fact that the needle end 62 is slightly inwardly projected and bent means that the paper bundle 12
The bottom surface of the sheet can be prevented from being scratched, and the needle 16 can be firmly bitten into the sheet bundle 12. The needle 16 can be formed to have substantially the same shape as a conventional power piercing head, except that the tip of the needle 16 is directed to the surface of the sheet bundle and runs along a guide groove that is inclined in parallel. Is.

The preferred embodiment of the present invention has been described above in detail. Any modification and change can be freely made without departing from the spirit and scope of the present invention. Therefore, the description in this specification is to be construed as showing only examples of the present invention, and not for limiting the scope of the present invention.

[0023]

As described above in detail, according to the needle bending mechanism for the power binding device according to the present invention, the inclination angle of the pair of folding portions in the folding head with respect to the bottom surface of the sheet bundle is set to be smaller than that of the conventional one. Since it is set loosely and the amount of protrusion of the bending part from the head at the time of bending is small, it is possible to bend the end of the needle surely and prevent the needle tip from rising and damage the skin and clothes. The excellent effect of being able to prevent

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire paper binding device according to an embodiment of the present invention.

FIG. 2 is a front sectional view showing a folding head of the paper binder shown in FIG.

FIG. 3 is a plan view of the head of FIG.

FIG. 4 is a perspective view of a paper bundle bound by the paper binding device of the present invention as viewed from the bottom surface.

FIG. 5 is a front view showing a piercing step in the paper binding operation according to the present invention.

FIG. 6 is a front view showing a folding step in the paper binding operation according to the present invention.

FIG. 7 is a front view showing a final step in the paper binding operation according to the present invention.

FIG. 8 is a front view showing a paper bundle bound by the paper binding device according to the present invention.

FIG. 9 is a perspective view showing a conventional power binding device.

10 is a front cross-sectional view showing a folding head of the paper binder shown in FIG.

FIG. 11 is a front view showing a piercing process in a conventional paper binding operation.

FIG. 12 is a front view showing a folding step in a conventional paper binding operation.

FIG. 13 is a front view showing a sheet bundle bound by a conventional sheet binding operation.

[Explanation of symbols]

 10 power type binding device 12 paper bundle 16 needles 24 piercing head 26, 70 bending head 46 bending portion 52a guide groove 62 needle end portion 68 needle tip portion 74 cylinder rod

Claims (12)

[Claims] 1. A folding head having a flat surface corresponding to the surface of a stack of sheets stacked and placed on a mounting table; and a penetrating head below the folding head and substantially in the plane. And a pair of bending portions each having a surface corresponding to the tip of the needle, and the rotation angle of the bending portion is such that both tips of the needle penetrate the paper bundle and The angle at which at least a part of both tips of the needle is deformed by contacting the bending portion in the bending head (A
1) A needle bending mechanism for a power binding device, comprising: a stop member for stopping the rotation of the folding portion as described below. 2. A bending bar is further provided on the lower side of the bent portion and biases each of the bent portions so that the pair of bent portions rotate in the upper direction toward the mounting table. A needle bending mechanism for a power binding device according to claim 1. 3. The needle bending mechanism for a power binding device according to claim 2, wherein the stop member is positioned to limit the downward movement of the folding rod. 4. The staple bending mechanism for a power binding device according to claim 3, further comprising a power binding device that penetrates the bundle of paper and forms a needle to be supplied into the folding portion. 5. The needle bending mechanism for a power binding device according to claim 4, further comprising a pneumatic actuator that drives the bending rod. 6. The control system further comprises a controller that first controls the powered paper binder to drive the staples and then controls an actuator that pivots the fold up.
A needle bending mechanism for a power binding device as described in. 7. The needle bending mechanism for a power binding device according to claim 1, wherein each of the bent portions has a groove for guiding the tip of the needle along the bent portion. 8. The grooves are provided along different directions, the different directions are not on the same line, and form an acute angle with respect to a line perpendicular to the rotation axis of each of the bent portions. The needle bending mechanism for a power binding device according to claim 7, wherein both ends of the staple are not positioned on the same line. 9. The needle bending mechanism for a power binding device according to claim 8, wherein the different lines are parallel to each other. 10. A step of supplying a sheet bundle to the piercing head, a step of operating the piercing head so that a needle having two tips pierces the sheet bundle, and a bending operation facing the piercing head. Surface for
The folding surface is axially rotated to the side of the paper bundle, and the piercing head and the folding surface are inclined at a predetermined angle, so that when the needle comes into contact with the folding surface, both ends of the needle are A method of binding paper, comprising the steps of folding in the directions of each other, and rotating the folding surface upward so that both tips of the needles bend inside the stack of sheets. 11. The step of providing a folding surface comprises providing a groove for guiding both tips of the needle, the groove aligning both tips of the needle so that the tips of the bent needle do not contact each other. 11. The method of binding a paper according to claim 10, including the step of forming a groove so as to guide along a non-existing line. 12. The paper binding method according to claim 11, wherein the lines that are not on the same line are set to be parallel to each other and form an acute angle with a line that is perpendicular to the rotation axis of the folding surface.