JP4117486B2 - Stapler with staple leg cutting mechanism - Google Patents

Description

  According to the present invention, a staple formed in a U-shape is driven out toward a binding sheet, and a staple leg penetrating the back side of the binding sheet is cut according to the thickness of the binding sheet, and then the staple leg is attached to the binding sheet. The present invention relates to a stapler provided with a staple leg cutting mechanism that is bent along the back surface.

  In a normal stapler, one kind of staple having a leg length corresponding to the maximum thickness bound by the stapler is loaded, and thereby, binding sheets from thin to maximum thickness are bound. For this reason, when binding thin binding sheets, the length of the staple legs penetrating to the back side of the binding sheets becomes longer, and when the staple legs are bent by the clincher mechanism, the leading ends of the staple legs cause the binding sheets to be bound. There were problems such as the occurrence of a re-penetration phenomenon that re-penetrated and protruded to the surface side. As a solution to this problem, there is known a so-called bypass clinch binding form in which the staple legs penetrating to the back side of the binding sheet are bent adjacent to each other so that the staple legs can be bent without interfering with each other. However, it is necessary to form a guide structure in the clincher mechanism portion for guiding the staple legs so that the side surfaces of the staple legs are adjacent to each other in this binding form, and high dimensional accuracy is required for assembly with the parts, and the cost is reduced. There was a problem of making it high. Furthermore, in the case of binding a binding sheet with the center portion stapled, a so-called inline binding form in which staple legs are arranged in a straight line is required.

Further, in a stapler built in a copying machine or the like, in order to prevent the staple legs from protruding toward the front side of the binding sheet when the thin binding sheet is bound as described above, the stapler protrudes toward the back side of the binding sheet. There has been proposed a stapler provided with a staple leg cutting mechanism that cuts the leading end portion of the staple leg that has passed through the binding sheet so that the length of the staple leg that has been made is substantially constant. The staple leg cutting mechanism is configured by a pair of movable clincher that bends the staple leg penetrating the back side of the binding paper along the back side of the binding paper, and a fixed cutter disposed between the pair of movable clinchers. The staple leg after passing through the binding sheet is cut by the movable cutting edge formed on the movable clincher and the fixed cutting edge of the fixed cutter, and the staple leg is bent by the movable clincher. At the same time, the tips of the staple legs are cut off.
Japanese Patent Publication No. 2-21922

Further, it is movable below the movable clincher that engages with the staple leg that has penetrated the binding paper and bends it along the back surface of the binding paper, and is movable in a direction substantially perpendicular to the penetration direction of the staple leg and penetrates the binding paper A movable cutting member formed with a first cutting edge to be engaged with the staple legs, and a fixed cutting member configured to guide movement of the movable cutting member; and a first cutting edge of the movable cutting member; A staple leg cutting mechanism has also been proposed that forms a second cutting edge that cooperates to cut the staple legs. In this staple leg cutting mechanism, the staple legs penetrating the binding sheet are engaged with the first and second cutting edges formed on the movable and fixed cutting members, and the movable cutting member is moved along the fixed cutting member. The leading end of the staple leg is cut by moving the staple leg, and then the staple leg is bent along the back surface of the binding sheet by a movable clincher mechanism.
Japanese Utility Model Publication No. 3-25930

  However, in the staple leg cutting mechanism in which the staple leg is cut by the movable clincher and the fixed cutter described above, each of the pair of movable clincher is supported so as to be pivotable. In order to cut the staple leg between the movable cutting edge of each movable clincher and the fixed cutting edge of the fixed cutter, a high dimensional accuracy is required for setting the clearance between the two cutting edges. In addition, there is a problem that accuracy of assembly and the like is required, parts cost and product cost are increased, and operation failure such as cutting failure and clinch failure occurs due to wear. In addition, since the direction of the burr formed on the end surface of the staple leg after being cut by the both cutting edges is formed on the outside of the staple leg, when the stapled sheets are stacked, the direction of the side of the staple leg is increased. There is a risk that quality problems such as rubbing marks remain on the paper sheets stacked by the burrs formed toward the surface.

  In addition, a movable cutting member is provided below the movable clincher, and the movable cutting member is moved in a direction substantially perpendicular to the penetrating direction of the staple legs to cut the staple legs from the fixed cutting member. In the latter prior art, since the movable clincher and the movable cutting member must be arranged on the same plane, the length of the portion of the movable clincher that engages with the staple leg cannot be formed large, and therefore the staple There has been a problem that the clinch shape of the legs cannot be bent into a stable shape. In addition, since the direction of the burr formed at the cutting end of the staple leg is formed in the direction of the side of the staple, when the stapled sheets are stacked, the direction of the burr is directed toward the side of the staple leg. There is a risk that quality problems such as rubbing marks remain on the sheets stacked by the formed burrs may occur.

  The present invention solves the above-mentioned problems in the prior art, and when the staple leg is cut, the burr formed at the tip is formed in a direction in which the finger is not touched in a clinched state. It is an object of the present invention to provide a stapler having a staple leg cutting mechanism in which a staple leg penetrating a sheet is formed in a curved shape facing a surface of a binding sheet and is surely clinched.

  In order to solve the above-described problem, a stapler provided with a staple leg cutting mechanism according to the present invention drives a staple from a driving mechanism unit toward a binding sheet to penetrate the staple leg through the binding sheet and penetrates the binding sheet. The staple leg cutting mechanism cuts the leading end of the staple leg penetrating the binding sheet so that the staple leg length is substantially constant, and the staple leg having the tip end cut off is attached to the back side of the binding sheet by the clincher mechanism. The staple leg cutting mechanism is operated from the outside toward the inside of the staple leg with respect to the fixed cutter disposed between the staple legs penetrating the binding sheet and the staple leg. And a pair of movable cutters arranged in the manner And a pair of movable clincher disposed on the lower surface side of each of the pair of movable cutters, and a staple leg penetrating the back side of the binding paper is engaged with the movable clincher so as to face inward. The staple which is curved and molded and guided between the movable cutter and the fixed cutter and the movable cutter is operated from the outside to the inside of the staple leg to cut the leading end portion of the staple leg, and then the staple is cut. The leg is bent along the binding sheet by the movable clincher.

  According to the present invention, the staple leg cutting mechanism includes a fixed cutter disposed between the staple legs penetrating the binding paper, and a pair of movable cutters disposed so as to be operated horizontally on both sides of the fixed cutter. Since the tip of the staple leg is cut by operating the movable cutter from the outside to the inside of the staple leg, there is a burr formed on the cut surface of the staple leg in the stapled state. Formed toward the inside of the staple leg, that is, toward the binding paper surface side, and is bound with the burr on the front end surface of the staple leg being in close contact with the back surface side of the binding paper. There is no risk of injury due to burrs caused by cutting the staple legs.

  Further, since the pair of movable cutters of the staple leg cutting mechanism are operated in the horizontal direction, the pair of movable clincher of the clincher mechanism is disposed on the lower surface side of each of the pair of movable cutters. And the movable clincher can be arranged on the same surface, the movable clincher can be rotated without moving the staple leg cutting mechanism, and the mechanism can be simplified and reduced in size, weight and production. Cost can be reduced. Furthermore, since the staple leg that penetrates the back side of the binding paper is engaged with the movable clincher so as to be bent inward and guided between the movable cutter and the fixed cutter, the binding paper is penetrated. The leading ends of the staple legs thus formed are formed into a curved shape facing the surface of the binding paper, and can be reliably clinched.

  The present invention aims at forming the burr formed at the tip when the staple leg is cut in a direction in which the burr is not touched with a finger, and is fixed between the staple legs penetrating the binding paper. A staple leg cutting mechanism is constituted by a cutter and a pair of movable cutters arranged so as to be operated from the outside to the inside of the staple legs with respect to the fixed cutter, and the pair of movable clinchers of the clincher mechanism By disposing the staple legs penetrating to the back side of the binding paper by the movable clincher so as to be bent inward by the movable clincher so as to be guided between the movable cutter and the fixed cutter. A more specific embodiment will be described below.

  Examples of the present invention will be described below. FIG. 1 shows a stapler provided with a staple leg cutting mechanism according to the present invention, and an electric motor and a drive mechanism that is rotationally driven by the electric motor are accommodated in a machine frame 2 that forms the outline of the stapler 1. In addition, a driving mechanism unit 3 is formed at the lower part of the machine frame 2 to drive the staple formed in a U shape by the driving mechanism toward a binding sheet. The driving mechanism portion 3 of the stapler 1 according to this embodiment forms a large number of straight staple members connected to each other into a U-shaped staple by a forming means, and the forming mechanism drives the formed staple by the driving means. It is configured to project upward toward the binding sheet disposed above the section 3.

  Further, a clincher mechanism portion 4 is formed on the upper portion of the machine frame 2 facing the driving mechanism portion 3 to bend the staple legs penetrating upward of the binding paper along the upper surface of the binding paper. The clincher mechanism unit 4 is supported with respect to the machine frame 2 so that the tip portion thereof is rotatable in the direction of approaching and separating from the driving mechanism unit 3, and the clincher mechanism unit 4 is normally driven by the driving mechanism unit 3. 2, and after the binding sheet is disposed between the driving mechanism unit 3 and the clincher mechanism unit 4, the binding sheet is disposed between the driving mechanism unit 3 and the clincher mechanism unit 4 as illustrated in FIG. 2. The clincher mechanism unit 4 is rotated so as to hold the binding sheet. After the clincher mechanism unit 4 is rotated in the direction of the driving mechanism unit 3, staples are driven out from the driving mechanism unit 3 toward the binding paper.

  The clincher mechanism section 4 includes a clincher mechanism 10 that is bent from the driving mechanism section 3 and penetrates the binding paper and bends along the upper surface of the binding paper, and the length of the staple leg that penetrates the binding paper. A staple leg cutting mechanism 5 is formed for cutting the leading end of the staple leg that has passed through the binding sheet so as to have a certain length. The clincher mechanism 10 includes a clincher piece 12 that engages with each staple leg penetrating the binding sheet and bends each staple leg inward, and an operating piece 13 that extends from the clincher piece 12 in a substantially right angle direction. It is formed of a pair of movable clinchers 11 which are formed in an L shape and are provided so as to be rotatable with respect to the support plate 8 by respective rotating shafts 14.

  The staple leg cutting mechanism 5 is disposed in a state of being in close contact with the upper surface of the fixed cutter 6 and the fixed cutter 6 disposed between the pair of staple legs that penetrate the binding sheet and protrude toward the upper surface side of the binding sheet. A pair of movable cutters 7 operatively supported from the outside to the inside of the staple legs, and the staple legs disposed between both side edges of the fixed cutter 6 and the pair of movable cutters 7. The movable cutter 7 is actuated so as to be actuated from the outside to the inside of the staple leg, so that the leading end portion of the staple leg is cut to a predetermined length between the cutting edges on both sides of the fixed cutter 6. I have to. In this way, the movable cutter 7 is operated from the outside to the inside of the staple legs to cut the tip end portion of the staple legs, whereby the direction of burrs formed on the cut end surfaces of the staple legs is set to the inside of both staple legs. The burrs are arranged in the direction in which they are in close contact with the binding sheets in a state where the binding sheets are bound by staples.

  As shown in FIG. 3, the movable clincher 11 is tilted at a position where the clincher piece 12 of the movable clincher 11 faces the staple which is driven out from the driving mechanism portion 3 toward the binding paper when the clincher mechanism 10 is not operated. The staple leg is bent inward by engaging the tip of the staple leg which is punched out from the driving mechanism unit 3 and penetrates the binding sheet with the inclined clincher piece 12. It is made to guide between the side edge of the fixed cutter 6 and the movable cutter 7. After the front end of the staple leg is cut by the staple leg cutting mechanism 5, the movable clincher 11 is rotated to bend the staple leg, in which the clincher piece 12 is formed in a curved shape, along the back surface of the binding sheet. Operate.

  The support plate 8 is formed with a rotating cam 9 for rotating the movable cutter 7 and the movable clincher 11. The rotating cam 9 engages with the side surface of the movable cutter 7 to slide the movable cutter 7 and engages with the operating piece 13 of the movable clincher 11 to rotate the movable clincher 11. The clincher cam 16 is integrally formed, and is provided on the support plate 8 so as to be rotatably supported by a rotation support shaft 17. Cam surfaces 15a and 16a formed on the outer peripheral surfaces of these cams 15 and 16 are arranged so as to face the operating pieces 13 of the movable cutter 7 and the movable clincher 11, respectively, and the cams 15 and 16 rotate. Accordingly, the movable cutter 7 and the movable clincher 11 are operated. The cutter cam 15 and the clincher cam 16 are integrally coupled so as to rotate together. As shown in FIG. 5, the lower end portion is oscillated by a drive mechanism that drives the stapler 1. It is made to rotate by the drive link 18 provided in this way.

  A front end portion 18a of the drive link 18 projecting forward of the support plate 8 through the opening 20 formed in the support plate 8 is engaged with the opening 20 formed in the cams 15 and 16. When the distal end portion 18a of the drive link 18 is swung up and down, the clincher cam 16 and the cutter cam 15 are integrally rotated about the rotation support shaft 17, as shown in FIG. In addition, the staple leg cutting mechanism 5 and the clincher mechanism 10 are respectively driven. The cutter cam 15 and the clincher cam 16 are integrally connected and rotated, but the movable cutter 7 that is slid by the cutter cam 15 and the movable clincher that is rotated by the clincher cam 16. 11 are set independently by giving the cutter cam 15 and the clincher cam 16 an arbitrary phase difference.

  As shown in FIG. 7, when the drive link 18 is not actuated, the tip 18a of the drive link 18 is disposed at the upper position, whereby the cutter cam 15 and the clincher cam 16 disposed on the left side in the figure are connected to the hour hand. It is arranged at a position rotated in the circumferential direction. The movable cutter 7 is disposed at a position retracted in the outward direction of the staple leg S1 of the staple S, and the clincher piece 12 of the movable clincher 11 is disposed in an inclined manner so as to face the launch position of the staple S. The staple leg S1 of the staple S driven out from the driving mechanism unit 3 toward the binding sheet passes through the binding sheet, and the leading end of the staple leg S1 is guided by the clincher piece 12 to enter between the fixed cutter 6 and the movable cutter 7. The cutter cam 15 and the clincher cam 16 do not rotate until they are guided while being molded into a curved shape.

  After the staple leg S1 which has been punched out from the driving mechanism unit 3 and penetrates the binding paper is guided between the fixed cutter 6 and the movable cutter 7, the driving link 18 is actuated by the driving mechanism, and the leading end portion 18a of the driving link 18 is reached. Is moved downward and the cutter cam 15 and the clincher cam 16 arranged on the left side in the figure are in the counterclockwise direction, and the cutter cam 15 and the clincher cam 16 arranged on the right side are in the direction of the hour hand. Rotate to As shown in FIG. 8, when the distal end portion 18 a of the drive link 18 is moved to the intermediate position, the movable cutter 7 is slid by the cam surface 15 a of the cutter cam 15, and thereby, between the fixed cutter 6 and the movable cutter 7. The leading end portion of the staple leg S1 disposed in the is cut. At this time, as shown in FIG. 10, the clincher cam 16 is not engaged with the operating piece 13 of the movable clincher 11, and therefore the movable clincher 11 is not yet operated.

  As shown in FIG. 9, when the drive link 18 is further operated and the tip 18a is operated to the bottom dead center position, the movable cutter 7 slides with the staple leg S1 cut by the arcuate cam surface 15a of the cutter cam 15. It is held at the moving position, and the cutting waste cut by this is prevented from falling in the direction of the binding paper. Furthermore, at this time, as shown in FIG. 11, the cam surface 16a of the clincher cam 16 engages with the operating piece 13 of the movable clincher 11 and presses the operating piece 13, thereby rotating the movable clincher 11 in the direction around the hour hand. Then, the clincher piece 12 of the movable clincher 11 is pressed so that the staple leg S1 is pressed against the back surface of the binding paper, and clinching is performed.

  As described above, in the present invention, the staple leg cutting mechanism 5 is fixed to the fixed cutter 6 disposed inside the staple leg S1 and the pair of movable cutters 7 disposed to operate from the outside to the inside of the staple leg S1. The movable cutter 7 is slid from the outside to the inside of the staple leg S1 to cut the leading end of the staple leg S1. As a result, the direction of the burr formed on the cut surface of the staple leg S1 is formed at the inner edge of the cut surface of the staple leg S1, and the staple leg S1 is clinched with the burr facing the binding sheet surface. Can do. Therefore, when the stapled sheets are stacked, quality problems such as rubbing marks remaining on the sheets stacked by the burrs of the staple legs S1 do not occur.

  Further, the clincher piece 12 of the movable clincher 11 is arranged in an inclined state corresponding to the launch position of the staple S, and the staple leg S1 penetrating the binding sheet is engaged with the clincher piece 12, thereby moving the staple leg S1 in the inner direction. In this state, the clincher piece 12 is bent along the back surface of the binding paper from this state, so that the leading end portion of the staple leg S1 is in close contact with the back surface of the binding paper. Clinched with Therefore, the leading end of the staple leg S1 does not float from the surface of the binding sheet, and when the stapled sheets are stacked, a rubbing mark remains on the sheet stacked by the leading end of the staple leg S1. It is possible to prevent the occurrence of quality problems such as the above.

  Further, the staple leg cutting mechanism 5 and the clincher mechanism 10 can be formed on the same surface on which the staple leg S1 is ejected, and the fixed cutter 6 and the movable cutter 7 of the staple leg cutting mechanism 5 are not retracted from this surface. Since the movable clincher 11 of the clincher mechanism 10 can be rotated, the mechanism can be simplified, and the size and weight can be reduced and the manufacturing cost can be reduced. Further, the movable cutter 7 is arranged so as to be in close contact with the fixed cutter 6 arranged inside the staple leg S1, and the movable leg 7 is slid on the fixed cutter 6 to cut the staple leg S1. Therefore, the clearance between the fixed cutter 6 and the movable cutter 7 can be easily set and maintained, and the formed burr can be made as small as possible.

Side view of a stapler implementing the staple leg cutting mechanism of the present invention. Side view of the same stapler as in FIG. 1 with the clincher mechanism operating Front view showing staple leg cutting mechanism and clincher mechanism formed in the clincher mechanism Plan view of staple leg cutting mechanism and clincher mechanism same as FIG. Side view of staple leg cutting mechanism and clincher mechanism as in FIG. Perspective view of staple leg cutting mechanism and clincher mechanism in an activated state Longitudinal front view of staple leg cutting mechanism before operation Longitudinal front view of staple leg cutting mechanism with movable cutter slid by cutter cam Longitudinal front view of the staple leg cutting mechanism with the movable cutter held in the slide operating position by the cutter cam Longitudinal front view of the clincher mechanism before operation Longitudinal front view of the clincher mechanism in a state where the movable clincher is rotated by the clincher cam.

Explanation of symbols

1 Stapler 5 Staple leg cutting mechanism 6 Fixed cutter 7 Movable cutter 10 Clincher mechanism 11 Movable clincher 15 Cutter cam 16 Clincher cam 18 Drive link

Claims (1)

The staples are driven out from the driving mechanism toward the binding paper, the staple legs penetrate the binding paper, and the staple legs are cut by the staple leg cutting mechanism so that the length of the staple legs penetrating the binding paper is substantially constant. A stapler that cuts the leading end portion of the staple leg that has penetrated, and bends the staple leg that has been cut at the leading end portion along the back surface of the binding paper by the clincher mechanism. A fixed cutter arranged between the staple legs and a pair of movable cutters arranged to be operated from the outside to the inside of the staple legs with respect to the fixed cutter, and the clincher mechanism, A pair of movable clinchers arranged on the lower surface side of each of the pair of movable cutters A staple leg that penetrates the back side of the binding paper is engaged with the movable clincher to be bent inward and guided between the movable cutter and the fixed cutter. The staple is characterized in that the tip end portion of the staple leg is cut by operating from the outside to the inside of the staple, and then the staple leg having the tip cut is bent along the binding paper by the movable clincher. Stapler with leg cutting mechanism.

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