JPH056015U - Wire reel cover device for binding machine - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevent rainwater from splashing on the wire reel of a portable binding machine that binds reinforcing bars and the like to prevent the binding machine from breaking down and prevent loosened wire from coming off the reel. [Structure] Reel mounting brackets 37, 37 provided at the rear of the binding machine 1 are provided with projections 112, 112 serving as shafts. Both sides 11 of the cover 110 covering the upper part of the reel R
The holes 114, 114 provided in the protrusions 3, 1
The cover 110 is fitted to the cover 12 and is rotatably attached. The front part of the cover 110 extends forward and the locking claw 11
5, 115 and the engaging holes 116, 116 of the binding machine 1 are engaged with each other so that they can be locked.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a wire reel cover device for a binding machine used for binding reinforcing bars.

[0002]

[Prior Art]

 Conventionally, the worker uses a wire to manually bind the reinforcing bars when constructing a reinforced concrete structure, but the amount of work is enormous depending on the scale of the structure. Therefore, in response to requests such as reduction of labor and improvement of work efficiency, a binding machine that automatically performs a series of binding work from winding the wire around the reinforcing bar and twisting and tightening the wire is proposed. Has been done.

This type of binding machine is formed so as to be portable, and a guide tube for binding wire is projected to the front of the main body. The front part of the guide tube is curved like a hook.If you hook this bent part on the reinforcing bar to be bound and turn on the manual switch, the long wire wound on the reel will be fed by the feeder mechanism to the front end of the guide tube. Sent from the department. The wire is bent by the bending portion and continuously delivered, and goes around the reinforcing bar a plurality of times.

Subsequently, a gripping part such as a chuck or a hook provided on a twisting mechanism protruding to the front of the binding machine body converges and grasps the wound wire, and the gripping part rotates to twist the wire. In addition to tightening, the cutting machine installed at the front end of the guide tube cuts the wire at the exit of the guide tube to finish the bundling work, and sequentially controls the operation of each mechanism described above to automatically perform one cycle of work. Carry out. Various binding machines of this kind have been proposed, but a bracket is provided so as to project from the rear part of the main body to the rear, and a reel around which a wire is wound is rotatably attached to the bracket to improve workability. Things are known.

[0005]

[Problems to be solved by the device]

 In the one-cycle process of the binding machine described above, the wire is supplied by the feed mechanism and twisted and cut after the supply is stopped, but in the binding machine of the type in which the reel is mounted on the bracket at the rear of the main body, the wire is The reel continues to rotate due to inertia even after the supply of electricity is stopped. At this time, the winding of the wire wound around the reel may loosen, the wire may come off the reel flange, and the reel bearing may become entangled, making the reel unrotatable, which may interfere with the supply of wire to the next work cycle. is there.

Further, when working in the rain, raindrops adhering to the wire wound around the reel enter the mechanism part together with the wire supplied to the binding machine, which may cause rust or malfunction of the electrical system. .. Therefore, it prevents wire entanglement due to wire detachment from the reel, prevents the work efficiency from decreasing, and prevents rainwater from entering the binding machine body, which may lead to rust or electrical system failure. There is a technical problem to be solved in order to solve it, and this consideration is aimed at solving the problem.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has brackets 37, 37 protruding from the rear of the portable binding machine 1, and a reel R wound with wire W is rotatably mounted on the brackets 37, 37. A cover 110 mounted on a binding machine 1 capable of binding the wire W to a reinforcing bar or the like by a wire feeding mechanism, a twisting mechanism and a wire cutting mechanism, which covers the outer peripheral surface of the reel R and It proposes a wire reel cover device for a binding machine, which covers from the upper part to the upper part of the wire insertion opening 38a of the binding machine 1 and is pivotally attached so as to be openable and closable.

[0008]

[Action]

 The top of the wire insertion port of the binding machine, which is mounted on the bracket protruding from the rear of the binding machine, is covered with a cover to prevent rainwater from adhering to the wire of the reel. Therefore, rainwater does not enter inside together with the wire sent to the binding machine. In addition, when the reel spins freely and the wire wound around the reel is loosened, the looseness of the wire is not extended to the outside of the reel flange because the looseness is restricted by the cover that covers the outer peripheral surface of the reel.

Since the cover is pivotally attached to the bracket or the binding machine and can be opened and closed, the reel can be easily replaced by rotating the cover to open the reel mounting portion.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. For convenience of description, the configuration of the entire binding machine will be described first. 1 is a side view of a binding machine with a side cover removed, FIG. 2 is an enlarged side view of a housing portion, FIG. 3 is a cross-sectional plan view of the housing portion, and FIGS. 4 to 10 are lines AA of FIG. , BB line, CC line, DD line, EE line, FF line, and GG line arrow view.

In the binding machine 1 shown in FIG. 1, a grip 3 is provided on the lower surface of a housing 2 made of die casting, and a motor 4 is driven by a Ni-cd battery (not shown) housed in the side surface of the housing 2. The motor 4 is arranged at the rear lower part of the housing 2 at the back of the paper in the figure, drives the first intermediate shaft 7 via the gears 5 and 6 as shown in FIGS. 7, the power is transmitted from the first intermediate shaft 7 to the second intermediate shaft 10 by the gears 8 and 9, and further in front of it, the gears 12 and 13 are transmitted to the main shaft 11 as shown in FIG. Transmits decelerated power.

As shown in FIG. 2, a worm gear 14 is fitted to the rear portion of the main shaft 11, and as shown in FIG. 10, a worm wheel 16 of a cam shaft 15 disposed in the left-right direction above the worm gear 14. The worm gear 14 meshes and rotates the cam shaft 15. The cam shaft 15 is fitted with four cams 17, 18, 19, 20 which will be described in detail when explaining the operation. In FIG. 10, the cam at the right end is the motor control cam 17, and as shown in FIG. 2, the push button 22 of the normally open type micro switch 21 for turning the drive power on and off is brought into contact with the cam surface. The power is cut off when the push button 22 is fitted into the recess. A microswitch 21 and a non-locking type manual switch 23 provided on the grip 3 are connected in parallel to the power source by the battery described above to form a self-holding circuit. Therefore, if the motor 4 is started by pushing the manual switch 23 once, the motor control cam 17 rotates, the push button 22 of the micro switch 21 comes out of the recess of the cam 17 and turns on, and the manual switch 23 is pushed. The power is not turned off even if is released. Then, as the motor 4 rotates, the motor control cam 17 makes one rotation, the push button 22 is fitted into the recess of the cam 17, and the power is cut off. The bundling machine 1 is configured such that during one rotation of the motor control cam 17, the other three cams 18, 19, 20 are used to sequence-control a series of operations from wire feeding to bundling. There is.

A pawl clutch 24 having pawls on both front and rear surfaces is loosely fitted to an intermediate portion of the main shaft 11 by a feather key 25 so as to be movable on the main shaft 11, and a bevel gear 26 with a pawl capable of meshing with the pawl clutch 24. And a spur gear 27 with a claw are freely rotatably inserted in front of and behind the claw clutch 24. The claw bevel gear 26 meshes with a bevel gear 28 arranged above it, and as shown in FIG. 8, a spur gear 29 formed coaxially with the bevel gear 28 meshes with an opposing spur gear 30. The shaft of the spur gear 30 penetrates the upper partition wall 31 of the housing 2, and the driving roller 32 is fitted to the upper end portion thereof. The driving roller 32 is formed by engraving a V groove 33 in the circumferential direction at the center of the outer periphery of the spur gear, and meshes with a driven roller 34 of the same shape as shown in FIG. The wire is clamped and sent out.

The driven roller 34 is axially attached to one end of an opening lever 35 pivotally attached to the upper partition wall 31. As shown in FIG. 3, the opening lever 35 is provided with a coil spring 36, which is biased in the counterclockwise direction in the figure, and the driven roller 34 is brought into pressure contact with the main driving roller 32 to be meshed therewith. The other end of the opening lever 35 projects to the outside of the housing 2, and if the projecting portion is pressed toward the housing 2 and the opening lever 35 is rotated clockwise, the driven roller 34 moves from the driving roller 32. Separate. When using the binding machine 1, it is necessary to insert a wire between the two rollers 32 and 34, but if the opening lever 35 is operated to widen the distance between the two rollers 32 and 34, the wire is inserted. The tip of the can be easily inserted.

A guide tube 40 is arranged in front of the two rollers 32 and 34, and a rear end of the conduit is directed to a meshing portion of the two rollers 32 and 34. The guide tube 40 can slide back and forth within the housing 2 within a certain range, and as shown in FIG. 2, a coil spring 41 is interposed between the guide tube 40 and the housing 2, and the guide tube 40 is always urged forward. In the stopped state shown in (4), the stopper pin 42 provided on the housing 2 is engaged with the engaging portion 43 of the guide tube 40 and its forward movement is restricted.

One end of a cable wire 44 is fixed to the rear portion of the guide tube 40, and the other end of the cable wire 44 is fixed to the tip portion of a guide tube return lever 45 pivotally attached to the rear portion of the housing 2. There is. When the guide tube return lever 45 is rotated counterclockwise in the figure by the rotation of the guide tube return cam 20 of the cam shaft 15 described above, the guide tube 40 connected via the cable wire 44 is connected to the guide tube return lever 45. Pull back.

On the other hand, the upper end plate 47 of the pulley 46 horizontally pivotally attached to the upper surface of the intermediate portion of the guide tube 40 shown in FIGS. 2 and 3 is formed with a protrusion 48 protruding laterally. An adjusting screw 49 is screwed onto the protrusion 48 in the rotation direction of the pulley 46. When the pulley 46 rotates clockwise in FIG. 3 by a cam mechanism described later, the head of the adjusting screw 49 pushes the stopper pin 42 to push it in, and the guide tube 40 is released from the movement restriction. At this time, the guide tube return lever 45 is not pressed by the guide tube return cam 20, and the guide tube 40 projects forward. Then, the protrusion 50 protruding laterally from the intermediate portion of the guide tube 40 shown in FIG. 2 collides with the stopper 51 provided in the housing 2 in front of the protrusion 50 and its movement is restricted.

Subsequently, at the end of the bundling operation, the guide tube return lever 45 is rotated by the guide tube return cam 20, the guide tube 40 is pulled by the cable wire 44 and retracted, and the stopper pin 42 is engaged. By engaging 43, the guide tube 40 returns to the predetermined position shown in FIGS. 2 and 3. FIG. 11 is a vertical cross-sectional view of the main part of the guide tube 40, and shows two parallel guide paths 52, 53. The lower guideway is the wire guideway 52 and the upper side is the cable wire guideway 53 of the cutting mechanism. A flat cutter chamber 55 that crosses the guide paths 52 and 53 is provided near the tip of the curved portion 54 of the guide tube 40, and a guide pin 56 is provided upright in the wire path in the cutter chamber 55. The guide pin 56 is provided with a guide hole 57, which is a passage for the wire, and forms a relay path to an inclined guide hole 58 at the tip of the guide tube 40 described later.

A cutter plate 59 having a hole having substantially the same diameter as that of the guide pin 56 is loosely fitted to the guide pin 56, and one end of the cable wire 60 is locked to the end of the cutter plate 59. The other end is locked to the pulley 46. The cutter plate 59 is provided with an opening 61 at a portion corresponding to the vicinity of the inlet of the guide hole 57 of the guide pin 56, and a hole 62 for connecting the outlet of the guide hole 57 of the guide pin 56 and the inclined guide hole 58. It is provided. Therefore, in the state shown in the figure, the wire fed through the wire guide path 52 passes through the guide hole 57 of the guide pin 56, the hole 62 of the cutter plate 59, and the inclined guide hole 58, respectively, and is fed from the tip portion.

On the other hand, when the pulley 46 is rotated clockwise in FIG. 3, the cable plate 60 shown in FIG. 11 pulls the cutter plate 59 and rotates counterclockwise in FIG. Shear the wire by. As shown in FIG. 4, a pulley 63 is provided with a spring 63 to apply a rotational force in the counterclockwise direction in FIG. 3, and a lever 64 fixed to the lower portion of the pulley 46 by the operation of a cam 18 described later. When is not pressed, the cutter plate 59 is formed so as to return to the position shown in FIG.

In the curved portion 54 of the guide tube 40, as shown in FIGS. 12 and 13, a guide groove 65 is arranged in parallel with the wire guide path 52. The guide groove 65 is a circular groove whose inner peripheral surface is open with a radius substantially the same as that of the wire guide path 52. The wire sent from the wire guide path 52 is circulated along the groove and wound around a target rebar. It is something to turn. Guide pieces 67, 67 which are widened to the left and right are provided at the introduction portion 66 of the guide groove 65, and the tip end of the wire fed from the wire guide path 52 is brought into contact with the guide pieces 67, 67 to guide the guide groove 65. I am trying to make sure that it can be introduced. Further, the tip end portion of the wire guide path 52 is displaced toward the introduction portion 66 of the guide groove 65 to form the inclined guide hole 58. As a result, the center of the left and right blurring of the delivered wire can be made to substantially coincide with the center of the introduction portion 66 in the width direction, and the wire collides with the guide pieces 67, 67 and rebounds to jump outward. It eliminates the failure in the winding stage of the binding work.

Next, a twisting mechanism for twisting and tightening the wound wire will be described. As shown in FIG. 2, the twisting mechanism 70 is arranged below the guide tube 40. The torsion mechanism 70 has a rear shaft 71 and a front shaft 72, which are divided into two parts, which are connected to each other by a coil spring 73, a ball clutch 75 formed by balls 74, 74. The spur gear 76 fitted to the above is meshed with the spur gear 27 with a claw that is loosely fitted to the main shaft 11 described above. An outer cylinder 77 is slidably fitted on the front shaft 72. As shown in FIG. 14, a hook 79 is inserted into a slit 78 provided on the outer cylinder 77, and an intermediate portion of the hook 79 is attached to a cotter pin 80. The fork 81 formed at the rear end of the hook 79 is inserted into the slot 82 at the tip of the front shaft 72 and is locked by the stop pin 83. Therefore, when the outer cylinder 77 is slid rearward with respect to the front shaft 72, the hook 79 is jumped up as shown in the figure. When the outer cylinder 77 is slid forward, the hook 79 rotates in the opposite direction and abuts on the tip of the outer cylinder 77. Only the abutting portion 84 is projected forward so that the wire can be sandwiched between the hook 79 and the tip of the outer cylinder 77.

Next, a cam mechanism that controls the operation of each of the above-mentioned mechanism parts will be described. FIG. 15 shows the three cams 17, 18 and 19 shown in FIG. 10. The clutch shift shaft 90 that engages with the clutch cam 19 has a roller 91 axially supported at the tip end thereof that abuts against the cam surface of the clutch cam 19. Touching. As shown in FIG. 2, the clutch shift shaft 90 extends below the cam shaft 15 and extends forward. As shown in FIG. 2 and FIG. 7, the clutch shift shaft 90 has a clutch shifter 92 fitted to the tip of the shaft. It is fitted in a groove portion 93 provided in the intermediate portion of the clutch 24. Further, the cutting / grasping cam 18 shown in FIG. 15 is in contact with a roller 101 pivotally supported on the tip of the shift shaft 100. The shift shaft 100 is provided with a pulley 46 of a wire cutting mechanism and a twisting mechanism 70. And the hook 79 of. As shown in FIGS. 3 and 4, the shifter 102 fixed to the tip of the shift shaft 100 is fitted into the groove 85 provided in the outer cylinder 77 of the twisting mechanism 70. Further, a pin 103 is provided so as to project upward from an intermediate portion of the shift shaft 100, and the pin 103 is made to face the rear surface of the lever 64 under the pulley 46 described above. The motor control cam 17 shown in FIG. 15 turns on / off the micro switch 21 as described above.

The binding machine 1 performs the process of one cycle by rotating the cam shaft 15 once clockwise from the stopped state shown in FIG. 15, which will be described with reference to the cam diagram of FIG. To do. First, as shown in FIG. 1, the reel R around which the wire W is wound is mounted on the brackets 37, 37 at the rear part of the housing 2, and the tip of the wire W is inserted into the insertion tube 38 having an opening on the rear surface of the housing 2. Next, by pressing the release lever 35 shown in FIG. 3 to insert the wire W between the two rollers 32 and 34 and releasing the pressing of the release lever 35, the wire W is sandwiched between the two rollers 32 and 34. The work preparation is completed.

To perform the binding work, the curved portion 54 of the guide tube 40 shown in FIG. 1 is hung on a reinforcing bar (not shown) to be bound, and the manual switch 23 of the grip 3 is pushed (time A). As a result, the motor 4 is started, the spindle 11 is interlocked to rotate the motor control cam 17, the micro switch 21 is turned on, and one cycle operation is performed regardless of whether the manual switch 23 is on or off. . When the motor 4 is started, the clutch shift shaft 90 retracts from the neutral position (N in FIG. 16), the pawl clutch 24 meshes with the bevel gear 26 with pawls loosely fitted on the main shaft 11, and drives the roller 32. The wire W fed through the wire guide path 52 passes through the above-mentioned inclined guide hole 58 and is introduced into the guide groove 65, and is further wound around the reinforcing bar along the guide groove 65 for a predetermined number of turns.

Next, at time B, the claw clutch 24 returns to the neutral position, the rollers 32 and 34 stop, and the shift shaft 100 that engages with the cutting / grasping cam 18 advances and the wound wire W is wound. Is held by the hook 79. At the same time, the pin 64 provided at the intermediate portion presses the lever 64 at the lower portion of the pulley 46, and the wire W is sheared by the cutter plate 59 at the tip portion of the guide tube 40. Further, the adjusting screw 49 provided on the upper portion of the pulley 46 presses the stopper pin 42 to release the lock of the guide tube 40, and the guide tube 40 is projected forward by the bias of the coil spring 41. Since the guide tube 40 has moved forward of the wire wound around the reinforcing bar, when the binding machine 1 is pulled backward, the wire W wound around the reinforcing bar is tensioned by the hook 79. This makes it possible to make the tightening force of each turn uniform when the wire wound multiple times is twisted.

Next, at time point C, the claw clutch 24 meshes with the claw spur gear 27 to rotate the twisting mechanism 70, and the wire W held by the hook 79 is twisted to bind the reinforcing bars. Then, the pawl clutch 24 returns to the neutral position, the rotation of the twisting mechanism 70 is stopped, the shift shaft 100 is retracted, the hook 79 is raised, and the clamped wire W is disengaged. (Time point D).

Subsequently, the guide tube return cam 20 shown in FIG. 2 presses the guide tube return lever 45 and rotates, and the guide tube 40 retracts (time point E). When the guide tube 40 retracts to the position shown in FIG. 2, the stopper pin 42 provided on the housing 2 side projects and engages with the engaging portion 43 of the guide tube 40. After that, the guide tube return cam 20 releases the pressure of the guide tube return lever 45 to release the tension of the cable wire 44, and the motor control cam 17 turns off the micro switch 21 to turn off the power source and perform one cycle. The binding work is completed (time point F). In this way, the work of winding the wire around the reinforcing bar, twisting it, and binding it is done automatically.

Next, the wire reel cover 110 will be described. As shown in FIG. 1, brackets 37, 37 project from the left and right sides of the rear part of the housing 2 to the rear. As shown in FIGS. 17 to 19, cylindrical protrusions 111, 112, 111, 112 are provided on the left and right sides of the rear end portions of the brackets 37, 37, respectively, and the inner protrusions 111, 111 are formed. Is loosely fitted into the hollow hub H of the reel R, and the reel R is rotatably supported.

On the other hand, holes 114, 114 opened on the left and right side pieces 113, 113 of the cover 110 are fitted to the outer protrusions 112, 112. The cover 110 is made of an elastic resin material or the like, and covers approximately the latter half of the outer peripheral surface of the reel R, as shown in FIG. 1, and further extends forward from the upper surface to the upper surface of the housing 2 of the binding machine 1. It covers the back. Locking claws 115, 115 are provided on the lower surface of the front end portion of the cover 110, and engaging holes 116, 116 are formed in the upper surface of the housing 2 corresponding to the locking claws 115, 115. As described above, since the cover 110 is made of an elastic material, the locking claws 115, 115 can be pressed into the engaging holes 116, 116 to be fitted therein.

As shown in FIG. 18, the rear portion of the cover 110 is arranged in a step narrower than the space between the brackets 37, 37 so that the rotation of the cover 110 is not hindered. Therefore, when the engagement between the locking claws 115, 115 at the front part of the cover 110 and the engagement holes 116, 116 is released and the cover 110 is rotated, the upper surface of the reel R is opened as shown in FIG. It If the reel R is lifted up in this state, the brackets 37, 37 are elastically expanded and the empty reel can be removed. Then, if a new reel R is dropped from above and pressed downward, the protrusions 111, 111 of the brackets 37, 37 are fitted and mounted in the hollow hub H of the reel R. After that, the tip end of the wire W is inserted into the wire insertion opening 38a of the binding machine 1, the above-mentioned opening lever 35 is operated to hold the wire between the two rollers 32 and 34, and the cover 110 is rotated forward. When the locking claws 115, 115 are engaged with the engaging holes 116, 116 by moving, the loading of the wire W is completed.

During the binding operation, the wire W of the reel R is drawn into the binding machine 1 in the wire feeding process, and the reel R rotates, and also rotates by inertia after the feeding process. As a result, the wire W wound around the hub H of the reel R is loosened, but since the outer peripheral surface of the reel R is covered by the cover 110, the wire W goes beyond the left and right reel flanges F, F to the outside. It will not come out and will not be entangled with the protrusions 111, 111 of the brackets 37, 37 and the like. Further, since the cover 110 covers the upper part from the upper surface of the reel R to the wire insertion opening 38a, rainwater does not adhere to the wire W during rainy weather, and the rainwater together with the wire W enters the binding machine 1. Entry is prevented.

The shape and the like of the cover 110 are not limited to the above-mentioned embodiment, and although not shown in the drawings, the cover 110 can be modified so as to cover not only the outer peripheral surface but also the outer surface thereof. It goes without saying that the invention of the invention extends to those modifications.

[0034]

[Effect of the device]

 In this invention, as described in detail in the above-mentioned one embodiment, since the outer peripheral surface of the reel of the wire attached to the binding machine is covered with the cover, the loosened wire does not come off from the reel, It is possible to prevent accidents that involve work such as bearings and make work impossible. In addition, since the rainwater does not adhere to the wire wound around the reel, the rainwater does not enter the binding machine, which may cause water to collect inside the binding machine and cause rust, or the electrical system to malfunction. This is a practically valuable idea that can be solved and improves workability as well as durability and reliability.

[Brief description of drawings]

FIG. 1 is a side view of a binding machine with side plates removed.

FIG. 2 is an enlarged view of a housing portion of FIG.

FIG. 3 is a plan view in which a top plate of the housing is cut away.

FIG. 4 is a sectional view taken along the line AA of FIG.

FIG. 5 is a sectional view taken along the line BB of FIG.

FIG. 6 is a sectional view taken along the line C-C of FIG.

FIG. 7 is a sectional view taken along the line D-D of FIG.

FIG. 8 is a cross-sectional view taken along the line EE of FIG.

FIG. 9 is a sectional view taken along the line FF of FIG.

FIG. 10 is a sectional view taken along the line GG in FIG.

FIG. 11 is a partially cutaway left side view of the guide tube.

FIG. 12 is a bottom view of a main part of the guide tube.

FIG. 13 is a right side view of the guide tube.

FIG. 14 is a partially cutaway plan view showing a main part of a twisting mechanism.

FIG. 15 is a side view of a motor control cam, a disconnection / grasping cam, and a clutch cam.

FIG. 16 is a cam diagram showing the operation timing of each cam.

FIG. 17 is a plan view of a main part of the binding machine.

FIG. 18 is a rear view of the binding machine.

FIG. 19 is a side view of a main part of the binding machine showing a state in which a cover is opened.

[Explanation of symbols]

 1 Bundling machine 37 Bracket 38 Introducing tube 38a Insertion port 110 Covers 111, 112 Projection 113 Side piece 114 Hole 115 Locking claw 116 Locking hole R Reel W Wire

Claims (1)

[Claims for utility model registration] [Claim 1] The bracket 3 is provided at the rear of the portable binding machine 1.
7, the reel R having the wire W wound thereon is rotatably attached to the brackets 37, 37, and the wire W is bound to a rebar or the like by a wire feeding mechanism, a twisting mechanism and a wire cutting mechanism. A cover 110 to be attached to the binding machine 1 that is capable of covering the outer peripheral surface of the reel R and the upper part of the reel R to the upper part of the wire insertion opening 38a of the binding machine 1 and is openable and closable. A wire reel cover device for a pivotally bound binding machine.