JP4117485B2 - Stapler movable clincher drive mechanism - Google Patents

Description

  The present invention provides a stapler having a movable clincher mechanism in which staples formed in a U-shape are driven out toward a binding sheet, and staple legs penetrating the back side of the binding sheet are bent along the back side of the binding sheet. The present invention relates to a movable clincher driving mechanism.

  In an electric stapler or the like in which staples are driven toward binding sheets and a plurality of binding sheets are bundled and bound by the staples, staples molded into a U-shape having a pair of legs extending in the same direction are used. The binding mechanism is driven from the front side of the binding sheet toward the binding sheet, and each of the pair of staple legs penetrating the binding sheet is bent along the back surface of the binding sheet by the clincher mechanism. A general clincher mechanism in a conventional electric stapler is formed by a pair of movable clincher provided so as to be rotatable so as to face each staple leg penetrating to the back side of the binding paper, and a launch mechanism. After most of the staple legs of the staples punched out of the staple have passed through the binding paper, the movable clincher is rotated to cause the staple legs to bend along the back surface of the binding paper, thereby causing staple binding. I am doing so.

The pair of movable clincher is rotatably supported between two clincher guide plates arranged in parallel in the front-rear direction so as to face the staple launch position, and the clincher surface penetrates the binding paper. Arranged to engage with each of the staple legs. In order to rotate this movable clincher, a drive lever whose center part is rotatably supported by a frame is provided, and a drive cam which is rotated by a motor driving a stapler at the rear part of this drive lever Is engaged with the front end portion of the drive lever in the vertical direction, and the front end portion of the drive lever is engaged with a part of the movable clincher so that the movable clincher is rotated by the swing operation of the drive lever. I try to move it. The roller attached to the rear end of the drive lever is brought into contact with the cam surface of the drive cam, and when the drive cam rotates, the rear end of the drive lever is swung up and down, thereby rotating the drive lever. Since the front end swings up and down about the support shaft and pushes down a part of the movable clincher, the movable clincher rotates around the support shaft and the clincher surface engages with the staple legs to bind the staple legs. The binding sheet is bound along the back side of the sheet.
JP-A-10-128683

  By the way, the movable clincher is rotated by the drive link within the range of the operation stroke, and the clincher surface of the movable clincher is engaged with the staple leg and pressed so that the staple leg is in close contact with the back side of the binding sheet. In the conventional movable clincher operating mechanism, the movable clincher is rotated by a drive lever that is swung by a drive cam. The operating stroke is proportional to the rotational stroke of the movable clincher. Therefore, if the oscillating stroke amount of the tip of the drive lever fluctuates or the range of the operation stroke deviates due to accumulation of dimensional tolerances of parts such as the drive lever and the drive cam, the drive lever is operated. The clincher operating stroke fluctuates, the final operating position of the clincher surface of the movable clincher is not within the predetermined range, and the staple leg floats from the back side of the binding paper, or the leading end of the staple leg is on the front side of the binding paper. Or the staple leg clinch shape cannot be maintained in a stable state.

  The present invention solves the above-mentioned problems in the prior art, and allows the movable clincher that bends the staple leg along the back surface of the binding sheet to be reliably operated within a predetermined operating stroke range. It is an object of the present invention to provide a stapler provided with the actuating mechanism.

  In order to solve the above-described problems, the movable clincher operating mechanism of the stapler according to the present invention drives a staple formed in a U-shape from the driving mechanism portion toward the binding paper, and penetrates the staple leg of the staple through the binding paper. And a staple leg that penetrates the back side of the binding paper in a stapler in which the staple leg that penetrates the binding paper is bent along the back side of the binding paper by a clincher mechanism disposed on the back side of the binding paper. A pair of movable clincher provided with clincher pieces arranged to be able to engage with each other, and rotatably provided so as to face the staple launching position, and to engage the movable clincher and rotate the movable clincher A clincher cam having a surface is rotatably disposed in the vicinity of each movable clincher. The clincher cam is rotationally driven through a drive link that is configured by a linking mechanism and is driven by a drive mechanism that drives a stapler, and the movable clincher is rotated by an arcuate cam surface formed on the clincher cam. It is made to move.

  According to a second aspect of the present invention, there is provided an arc portion formed on the cam surface of the clincher cam having a same radius from a rotation center that prevents the clincher operation piece from being displaced when the clincher cam rotates more than a predetermined amount. It is formed.

  According to the present invention, the clincher mechanism includes a movable clincher provided with a clincher piece arranged to be able to engage with a staple leg penetrating the back side of the binding paper, and a rotation arranged adjacent to the movable clincher. The clincher mechanism is configured by rotatably supporting each of the cams, and the rotating cam is driven to rotate through a drive link that is swingably operated by a driving mechanism that drives a stapler. Since the movable clincher is rotated by the formed arc-shaped cam surface, the movable clincher is rotated by the cam surface of the rotating cam. Regardless of fluctuations, it is regulated by the rotation of the rotating cam, so the movable clincher is operated with a predetermined operating stroke. Rukoto can.

  The present invention is capable of engaging with a staple leg penetrated on the back side of the binding paper for the purpose of surely operating a movable clincher that bends the staple leg along the back side of the binding paper within a predetermined operation stroke range. The clincher mechanism is constituted by a movable clincher having a clincher piece arranged in a movable manner and supported rotatably so that the movable clincher is rotated, and a rotating cam arranged adjacent to the movable clincher to drive the stapler. This is realized by engaging a drive link that is oscillated by the drive mechanism being engaged with the rotary cam to rotate the rotary cam, and rotating the movable clincher by the rotary cam. Further specific examples will be described below.

  FIG. 1 shows a stapler provided with a movable clincher drive 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 unit 4 includes a staple leg cutting mechanism 5 that cuts the tip end portion of the staple leg in order to make the length of the staple leg that has been punched out from the driving mechanism unit 3 and penetrates the binding paper, and the staple. A clincher mechanism 10 is formed that bends the staple leg cut to a certain length by the leg cutting mechanism 5 along the upper surface of the binding sheet. The staple leg cutting mechanism 5 is disposed in a state of being in close contact with the fixed cutter 6 disposed between a pair of staple legs that penetrate the binding sheet and protrude to the upper surface side of the binding sheet, and the upper surface side of the fixed cutter 6. And a pair of movable cutters 7 that are operatively supported from the outside to the inside of the staple legs, and are arranged between both side edges of the fixed cutter 6 and the pair of movable cutters 7. The staple leg is actuated so as to actuate the movable cutter 7 from the outside to the inside of the staple leg, so that the distal end portion of the staple leg is between the cutting edges on both sides of the fixed cutter 6 and the movable cutter 7. Is cut to a predetermined length.

  The clincher mechanism 10 includes a clincher piece 12 that engages with each staple leg that penetrates the binding sheet and protrudes toward the back surface side of the binding sheet, and bends the staple leg inward, and the clincher piece 12. It is formed by a pair of movable clinchers 11 which are formed in an L shape by an operating piece 13 extending in a substantially right angle direction, and are rotatably supported by a rotating shaft 14 with respect to a support plate 8. ing.

  As shown in FIG. 3, the movable clincher 11 has a clincher piece 12 of the movable clincher 11 that faces the leading end of the staple leg of the staple that is ejected from the driving mechanism unit 3 toward the binding sheet when the clincher mechanism 10 is not operated. A pair of staple legs are supported by being arranged so as to be inclined at a position and engaging the tip of the staple leg which has been punched out from the driving mechanism unit 3 and penetrates the binding paper with the inclined clincher piece 12. Are guided between the side edge of the fixed cutter 6 and the movable cutter 7 while curving the staple legs. The movable cutter 7 of the staple leg cutting mechanism 5 is slid from the outside to the inside of the staple leg to cut the leading end of the staple leg, and then the movable clincher 11 is rotated to be molded into a curved shape by the clincher piece 12. It operates to bend the staple legs along the back side of the binding paper.

  The support plate 8 is formed with a rotating cam 9 for rotating the movable cutter 7 and the movable clincher 11. The rotary 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 supported by the support plate 8 so as to be integrally rotated by the rotation support shaft 17. Arc-shaped 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 rotate. Thus, 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 protrudes to the front side of the support plate 8 through an opening 19 formed in the support plate 8, and is loosely fitted in an opening 20 formed in the cams 15 and 16. Then, when the tip 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. The staple leg cutting mechanism 5 and the clincher mechanism 10 are driven by arcuate cam surfaces 15a and 16a formed on the cams 15 and 16, respectively. 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 a 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 drawing rotate. The cutter cam 15 and the clincher cam 16 arranged at the position rotated around the support shaft 17 in the direction of the hour hand, and the right side of the cutter cam 15 and the clincher cam 16 are rotated around the rotation support shaft 17 in the direction of the counter hour hand. Is arranged. 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 are not rotated until they are guided.

  After the staple leg S1 punched out from the driving mechanism unit 3 and penetrating the binding paper is guided by the clincher piece 12 and inserted between the fixed cutter 6 and the movable cutter 7, the driving link 18 is operated by the driving mechanism. Then, the tip 18a of the drive link 18 is swung downward, and the cutter cam 15 and the clincher cam 16 arranged on the left side in the figure are arranged in the counterclockwise direction around the rotation support shaft 17 and on the right side. The cutter cam 15 and the clincher cam 16 are rotated in the direction around the hour hand. As shown in FIG. 8, when the distal end portion 18a of the drive link 18 is moved to a substantially intermediate position, the movable cutter 7 is slid by the arcuate cam surface 15a of the cutter cam 15, whereby the fixed cutter 6 and the movable cutter are moved. 7 is cut off at the leading end of the staple leg S1 disposed between the two. At this time, 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 end portion 18a is operated to the bottom dead center position, the movable cutter 7 slides by cutting the staple leg S1 by the arcuate cam surface 15a of the cutter cam 15. It is held at the position, thereby preventing the cutting waste cut by this from falling in the direction of the binding paper. Further, at this time, the clincher cam 16 engages with the operating piece 13 of the movable clincher 11 and presses the operating piece 13 to thereby move the left movable clincher 11 in the hour hand direction and the right movable clincher 11 in the counter hour hand direction. The clincher piece 6 of the movable clincher 11 is rotated in the direction so that the staple leg S1 is pressed against the back surface of the binding paper to be clinched.

  The cutter cam 15 and the clincher cam 16 are formed with arcuate cam surfaces 15a, 16a set to have a predetermined radial dimension from the center of the rotation support shaft 17 that rotatably supports the cams 15, 16. The radial dimensions of the arcuate cam surfaces 15a, 16a of these cams 15, 16 are set so as to coincide with the slide stroke amount of the movable cutter 7 and the rotational stroke amount of the movable clincher 11. The rotation stroke amounts of these cams 15 and 16 are set larger than the slide stroke amount of the movable cutter 7 and the rotation stroke amount of the movable clincher 11. In this way, the arcuate cam surfaces 15a and 16a are formed from arcuate surfaces having a predetermined radial dimension from the center of the rotation shaft 17, and the rotation stroke amount of the cams 15 and 16 is set to the slide movement stroke of the movable cutter 7 and the movable clincher 11. By setting the rotation stroke to be larger than the rotation stroke, the slide stroke of the movable cutter 7 and the rotation operation stroke of the movable clincher 11 can be defined by the rotary cam 9, and the drive link 18 is swung. The movable clincher 11 can be reliably operated to a predetermined position with a predetermined operation stroke without being influenced by variations in the stroke.

  Hereinafter, the operating state of the movable clincher 11 by the clincher cam 16 on one side will be described with reference to FIG. As shown in FIG. 10A, when the drive link 18 is in an inoperative state, the tip end portion 18a of the drive link 18 is disposed at the top dead center position P1, and the clincher cam 16 rotates in the direction around the hour hand. Thus, the arcuate cam surface 16a is arranged in a state separated from the operating piece 13 of the movable clincher 11. Accordingly, the clincher pieces 12 of the movable clincher 11 are arranged in an inclined state so as to face the launch position of the staple S. When the drive link 18 is swung downward from the top dead center position P1, the clincher cam 16 is rotated integrally with the cutter cam 15 in the counterclockwise direction, and at this time, the cutter cam 15 rotates as described above. Then, the movable cutter 7 is slid to cut the tip of the staple leg S1.

  As shown in FIG. 10B, when the drive link 18 is further swung downward from the top dead center position P1, the clincher cam 16 is further rotated in the counterclockwise direction and the tip of the drive link 18 is moved. When the portion 18a is actuated from the top dead center position P1 to a position P2 below the top dead center position P1, the edge of the arcuate cam surface 16a of the clincher cam 16 engages with the operating piece 13 of the movable clincher 11 to move the movable clincher 11 Is rotated in the direction around the hour hand about the rotation shaft 14, and the staple leg S 1 is bent toward the back surface of the binding paper P by the clincher piece 12.

  Further, the tip 18a of the drive link 18 is pivoted downward, whereby the clincher cam 16 further rotates, and the tip 18a of the drive link 18 is lowered to the position P3 as shown in FIG. 10C. When actuated, the arc-shaped cam surface 16a of the clincher cam 16 comes into engagement with the back surface of the operating piece 13 of the movable clincher 11, and thus the movable clincher 11 is rotated by the arc-shaped cam surface 16a of the clincher cam 16. The moved state is the final rotation position of the movable clincher 11, and the clincher piece 12 of the movable clincher 11 is in a state where the staple leg S 1 is clinched along the back surface of the binding paper P at this position.

  Even after the staple leg S1 is clinched by the movable clincher 11, the drive link 18 is further swung, and the leading end 18a is lowered to the bottom dead center position P4 as shown in FIG. 10 (d). The clincher cam 16 is further rotated in the counterclockwise direction by the operation of the distal end portion 18a, but an arcuate cam surface 16a formed of an arcuate surface having the same radius from the rotation support shaft 17 of the clincher cam 16 is provided. Since the movable clincher 11 is engaged with the operating piece 13 of the movable clincher 11, the movable clincher 11 is not further rotated, and the clinching state of the staple leg S1 by the clincher piece 12 is maintained. That is, when the clincher cam 16 rotates from the position shown in FIG. 10B to the position shown in FIG. 10C, the movable clincher 11 is rotated to clinch the staple leg S1, and the tip of the drive link 18 The movable clincher 11 is not operated by the rotation while the 18a is operated from the top dead center position P1 to the P2 position and the rotation of the clincher cam 16 during the operation from the P3 position to the bottom dead center position P4. Even when the swing range of the drive link 18 varies, the clinching operation of the movable clincher 11 is not affected.

  According to the above-described embodiment of the present invention, the clincher cam 16 is formed with the arc-shaped cam surface 16a having a predetermined radius around the rotation support shaft, and the amount of rotation of the clincher cam 16 rotated by the drive link 18 is adjusted. The movable clincher 11 which is set to be larger than the rotation operation amount 11 and is operated by a predetermined operation stroke by the edge of the arcuate cam surface 16a of the clincher cam 16 is held in the operating position by the arcuate cam surface 16a. The operating stroke amount and stroke range of the movable clincher 11 can always be kept constant regardless of the fluctuation of the swing stroke of the drive link 18. Accordingly, the operation of bending the staple leg S1 along the back surface of the binding sheet P by the movable clincher 11 is stabilized, and the staple leg S1 is pressed more than necessary by the clincher piece 12, or the pressing amount is insufficient. Thus, the staple leg S1 is not clinched to the state where it is lifted from the back side of the binding sheet.

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 It is a longitudinal front view of the principal part which shows the operation state of a clincher mechanism, (a) The state before a drive link act | operates, (b) The state just before a movable clincher is rotationally operated, (c) A staple by a movable clincher The state where the leg clinching is completed, and (d) the state where the drive link is further operated after the clinching is completed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 9 Rotating cam 10 Clincher mechanism 11 Movable clincher 12 Clincher piece 13 Actuating piece 14 Rotating shaft 16 Clincher cam 16a Arc-shaped cam surface 18 Drive link

Claims (2)

  A staple formed in a U-shape is driven out from the driving mechanism portion toward the binding paper, the staple leg of the staple is passed through the binding paper, and the binding paper is formed by a clincher mechanism disposed on the back side of the binding paper. A stapler in which a staple leg penetrating the staple paper is bent along the back side of the binding paper, and a pair of movable clincher provided with a clincher piece arranged to be engageable with the staple leg penetrated on the back side of the binding paper is stapled. The clincher cams that are provided so as to be able to rotate in opposition to the launching position of the lens and that form an arcuate cam surface that engages with the movable clincher and rotates the movable clincher are disposed in the vicinity of the movable clinchers. The clincher mechanism is configured and operated by the drive mechanism that drives the stapler. Via the drive link so as to rotatably drive the said Kurinchakamu, movable clincher driving mechanism of the stapler being characterized in that so as to rotate operating the movable clincher by arcuate cam surface formed on the Kurinchakamu. The cam surface of the clincher cam is formed with an arc portion having the same radius from a rotation center that prevents the clincher operation piece from being displaced when the clincher cam rotates more than a predetermined amount. The movable clincher drive mechanism of the stapler according to claim 1.

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