JPS6128476B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electric stapler, and mainly relates to a stapler for binding stacked paper sheets, such as bound books having a predetermined thickness, using staples.

[Technical background of the invention and its problems]

Conventionally, various types of electric staplers of this type have been proposed. For example, in the case of a structure in which a needle pushing body is provided in a needle storage frame so as to be movable forward and backward via a biasing means, there is a need for a needle storage frame. When filling the inside with a U-shaped block-shaped needle group connected to a certain length, the needle pushing body is moved back greatly against the biasing means, and the needle storage frame in the front part of the needle pushing body is When the above-mentioned needle group is filled into the empty space of By pushing the needle group, the needle group is pushed out to the ejection guide section at the tip of the needle storage frame.

In this case, the biasing means must be configured with a strong biasing force because it is necessary to reliably move the needle pusher and send each needle of the needle group to the ejection guide in sequence through the needle pusher. It is common that

Therefore, when a needle group is filled into an empty needle storage frame, or when a needle group is filled into a needle storage frame where several needles remain, the needles are forced to retreat against the urging means. When the support of the needle pusher is released, the needle group is pushed all at once via the needle pusher by the strong return force of the urging means, and the needles at the tips of the needles strongly strike the ejection guide. Therefore, there are problems such as the needle being crushed and deformed, causing the needle to become clogged and making the stitching operation impossible, as well as requiring a lot of effort to remove the deformed needle. ing.

[Purpose of the invention]

The present invention controls the needle group pushing operation of the needle pusher after the needle group is filled into the needle storage frame, and pushes the needle group all at once to the ejecting guide section at the tip of the needle storage frame. In addition, the needles are prevented from being hit by the needles, and the needles are fed out into the guide section accurately and sequentially without being crushed or deformed, making it possible to perform the binding operation reliably and smoothly. The purpose is to measure the

[Summary of the invention]

The electric stapler of the present invention includes a needle holder 7 and a guide portion 3 that pushes out the needle 35a with respect to the needle holder 7.
A needle storage frame 29 that can be raised and lowered has a needle pushing body 48 that pushes the needle 35a facing the guide portion 39 and is biased so as to move forward and backward, and a compression spring 28 is attached to the upper part of the needle storage frame 29. an actuating arm 14 having a needle extruding blade 19 that is rotatably supported in the vertical direction through the needle extruding blade 19 and that extrudes the needle 35a stored in the needle storage frame 29 from the guide portion 39 to the needle holder 7; , a drive arm 24 rotatably supported on one side of the actuation arm 14 and having its tip engaged with the front part of the actuation arm 14, and a needle pusher 48 provided within the needle storage frame 29. A switching lever 93 has a winding groove 90 on the outer periphery for winding the string 105 that moves forward and backward, and is rotatably supported.
and a winding wheel 91 having an engaging protrusion 104, which is interlocked and connected to the drive system of the drive arm 24, and is engaged with a switching lever 93 of the winding wheel 91 to move the winding wheel 91 in the string rewinding direction. A locking protrusion 92 that prevents rotation and interlocks rotation of the winding ring 91 in the string winding direction.
a drive wheel 89 having a
and a switching protrusion 96 that switches and rotates to release the engagement with the locking protrusion 92, and a switching lever 93 that is rotatably provided with respect to the winding ring 91. The engagement protrusion 1 of the winding ring 91 rotates to
Control lever 1 that locks onto 04 and prevents it from rotating.
15, and a cam plate 68 which is operatively connected to the drive system of the drive arm 24 and rotates the control lever 115 to release the engagement with the engagement protrusion 104.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

First, the configuration of the embodiment will be explained.

Reference numeral 1 denotes a base having a plurality of landing pieces 2 made of rubber or the like having a large coefficient of friction on its lower surface.A support base 3 formed in a prismatic shape is fixed to the center of the upper surface of this base 1, and this support base A motor 5 is installed on a mounting frame 4 attached to the rear of the motor 3.

In addition, a needle holder 7 having a guide groove 6 is fixed to the upper surface of the front end of the support 3, and a drive block 8 is integrally erected in the middle of the support 3 in opposition to the needle holder 7. A holding frame 9 having a substantially U-shaped cross section is fixedly attached, and guide grooves 11 which are long in the vertical direction are formed in opposing guide side plates 10 of the holding frame 9 .

In addition, both ends of an elevating transverse rod 13 are inserted into the opposing guide long grooves 11 of the holding frame 9 via guide rollers 12 engaged therewith so as to be able to rise and fall, and the elevating transverse rod 13 has a U-shaped cross section. The base end 14a of the formed actuating arm 14 is supported so as to be freely rotatable in the vertical direction, and a reinforcing frame 15 formed in a U-shaped cross section is attached to the distal end of the actuating arm 14.
7, and a roller 18 is mounted between the actuating arm 14 and the reinforcing frame 15 on the horizontal shaft 17 on both sides of the rear part.
is rotatably mounted. Further, a needle extrusion blade 19 is vertically provided at the lower end of the operating arm 14 in a detachable and replaceable manner.

Next, a support shaft 20 is horizontally suspended between the opposing drive blocks 8 of the support base 3, and a cylindrical rotating body 21 which also serves as a spacer is rotatably fitted into both ends of the support shaft 20. A pair of drive arms 24 as a drive mechanism, which are formed into a substantially inverted L shape when viewed from the side and are formed of a horizontal portion 22 and a vertical portion 23, are integrally attached to the outer ends of the rotating bodies 21 on both sides, respectively. The distal end portions of the horizontal portions 22 of the pair of drive arms 24 are respectively engaged with the rollers 18 on both sides, and the lower end portions of the vertical portions 23 are connected to a pair of crank disks 25 as a drive mechanism.
It is adapted to be engaged with a roller 26 supported at an eccentric position.

Further, a compression spring 28 that expands and contracts in the vertical direction is interposed and locked between the bottom plate portion 27 of the holding frame 9 and the base end portion 14a of the actuation arm 14. The end portion 14a is pushed up, and the guide rollers 12 on both sides of the horizontal elevating rod 13 that supports it are engaged with the upper part of the guide groove 11, and the tip of the horizontal portion 22 of the drive arm 24 is The roller 18 and the roller 26 are engaged with the lower end of the vertical portion 23 of the drive arm 24, respectively.

Further, a needle storage frame 29 having a length corresponding to that of the support stand 3 is attached between the opposing drive block portions 8 of the support stand 3 so as to be movable up and down on a support shaft 30, and an upper part of the tip of the needle storage frame 29 is attached to the support stand 3 so as to be movable vertically. An annular connecting fitting 33 is interposed between the horizontal rod 32 of the mounting frame 31 integrally formed with the front horizontal shaft 16 of the distal end of the operating arm 14, and the needle storage frame 29 A compression spring 34 is interposed between the rear end and the rear end of the support base 3.

In addition, a pair of guide rails 36 for guiding a U-shaped block-like needle group 35 that is arranged in series over a certain length within the needle storage frame 29 are erected parallel to each other along the length direction thereof. The guide edges 37 formed at the tips of the pair of guide rails 36 are located slightly inside the guide edges 38 on both sides protruding from the tips of the mounting frame 31. The guide edge 38 and the guide edge 37 form a guide portion 39 of the needle push-out blade 19 that moves up and down in order to push out the needles 35a of the needle group 35 one by one into the guide groove 6. Further, an operating shaft 40 is horizontally mounted on the mounting frame 31 of the needle storage frame 29 so as to be movable forward and backward.
1 is attached so as to be vertically movable and rotatable via long guide grooves 43 formed in both side pieces 42,
A guide protrusion 14 for guiding the upward and downward movement of the needle extrusion blade 19 is formed inside this closing body 41 in the vertical direction, and engagement recesses 45 formed on both sides of this closing body 41 are connected to the mounting frame 31. It is removably locked to locking pins 47 on both sides, which are elastically supported by coil springs 46 on both sides at the lower sides of both sides. Further, a needle pushing body 48 formed in a U-shaped cross section for pushing the needle group 35 forward is engaged with the guide rail 36 of the needle storage frame 29 so as to be able to move forward and backward. A coil spring 50 whose one end is fixed to the cut-and-raised piece 49 is suspended from a guide roller 51 rotatably attached to the front part of the needle storage frame 29.
The other end is locked to a cut-and-raised piece 52 at the rear end of the needle storage frame 29. The needle pusher 48 is always urged forward by the coil spring 50, and its tip 48a pushes the needle group 35 forward.
It is designed to push forward. In addition, a large number of needle groups 35 are provided at the front and back part of the needle storage frame 29.
U-shaped guide frames 64 for attaching and detaching cassette cases 63, which are stacked vertically and stored therein, are erected facing each other in the front and rear.
A guide port 65 for inserting and removing is opened in communication.

Next, the rear end of a support frame 53 disposed parallel to the support base 3 is fixed to one drive block portion 8 of the support base 3, and a guide shaft 54 is attached to the outside of the support frame 53. is horizontally suspended, and has a switch lever 55 on this guide shaft 54.
6 is attached so as to be slidable in the front-back direction and fixed in position, and an interlocking piece 57 that is pushed by the switch lever 55 is rotatably supported on this sliding body 56 by a coil spring 58. A pushing part 61 for pushing a push button 60 of the limit switch 59 attached to the rear end of the support frame 53 is formed at the rear end of the interlocking piece 57. This limit switch 59 and a power switch 62 are connected to the motor 5 via an electronic control circuit.

Next, the crank disks 25 on both sides having the rollers 26 are fixed to both ends of a rotary shaft 66 which is rotatably suspended horizontally at the lower part of the support base 3, and an interlocking gear is attached to one side of the rotary shaft 66. A cam plate 68 passing through the rotating shaft 66 is fixed to one side of the interlocking gear 67, and a roller 69 is rotatably mounted on an eccentric position on one side of the cam plate 68. . Further, a push-up lever 70 with which the roller 69 of the cam plate 68 engages is rotatably mounted in the front part of the support base 3, and a push-up mechanism 71 is connected to the tip of the push-up lever 70. 7
A pair of needle bending stands 72 rotatably attached to the upper part of the needle holder 7 are provided in the guide groove 6 of the needle holder 7 so as to be movable up and down and rotatable. The pair of needle bending stands 72 are formed with inclined guide surfaces 73 for bending the leg pieces on both sides of the needle 35a driven inward. Then, the push-up lever 70 is pushed by the roller 69, and the push-up lever 70 is rotated via the push-up mechanism 71 so that the pair of needle bending bases 72 simultaneously push up their guide surfaces 73. The needle 35a is moved further inwardly and upwardly by its guide surface 73 to bend the legs on both sides of the needle 35a. In addition, a mounting frame 7 is provided at the lower front of the support stand 3.
A limit switch 75 connected to the mounting frame 74 via an electronic control circuit for controlling the movement of the motor 5 is fixed to the mounting frame 74, and an actuator 76 of the limit switch 75 operates the cam plate. It is arranged so as to face the rotational position of the cam 68a and the valley 68b formed on the outer periphery of the cam 68.

Next, an intermediate gear 77 meshed with the interlocking gear 67 is fixed to one side of a relay shaft 78 rotatably suspended horizontally at the lower part of the support base 3.
A relay gear 79 is fixed to the other end of the relay shaft 78 , and a guide ring 81 having a groove 80 inside the relay gear 79 is fixed to the relay shaft 78 . Further, a drive shaft 82 is rotatably suspended horizontally at the lower part of the support base 3, and a drive gear 83 fixed in the middle of this drive shaft 82 is meshed with the relay gear 79. Between the input gear 84 fixed to one end and the output gear 86 fixed to the output shaft 85 of the motor 5, there are teeth 8 on the inner surface thereof which mesh with the teeth 84a and 86a of the input gear 84 and the output gear 86.
Timing drive belt 8 having an inner surface 7a
7 is suspended.

Further, a clutch mechanism 88 is provided at the other end of the drive shaft 82. This clutch mechanism 88
A switching interlock gear 89 as a drive wheel meshed with the intermediate gear 77 is rotatably attached to the other end of the drive shaft 82.
A rotary wheel 91 as a winding wheel having a winding groove 90 on the outer periphery is rotatably attached to 2. A locking protrusion 92 is provided on the inner surface of the switching interlocking gear 89, and a switching lever 93 is provided on the outer surface of the rotary wheel 91 so as to be rotatable on a support shaft 94 at its center. At one end of this switching lever 93, an engaging protrusion 95 that engages and disengages from the locking protrusion 92 and one switching protrusion 96 that protrudes from the mounting frame 74 engages to control switching. A slider 98 protruding from the other end of the switching lever 93 is slidably engaged in the arcuate guide groove 99 of the rotary wheel 91. A spring 102 made of piano wire, one end of which is wound around a locking rod 100 protruding inside the slider 98 and locked to a locking portion 101 inside the rotating wheel 91, has a mountain shape formed at the other end. The engaging part 10 of
3, and furthermore, this rotating wheel 91
An engaging protrusion 104 is formed in a bulging manner on the inner outer edge.

Next, a string 105 is attached to the outer edge of the rotating wheel 91.
One end is fixed with a screw 106, and this string-like 1
05 is connected to the control mechanism 1 through the winding groove 90 of the rotating wheel 91.
The needle storage frame 29 is pulled out through the guide port 108 of the needle storage frame 29 through the guide roller 109.
The cord-like 1
The other end of the needle pusher 48 is fixed to a fixing portion on the back surface of the needle pusher 48 with a pin 111.

The control mechanism 107 has a mounting frame 112 fixed to the back surface of the support base 3.
A U-shaped support frame 113 with the guide port 108 formed therein is fixedly attached to the back surface of the support frame 113, and a substantially L-shaped control lever 1 is attached to a side plate 114 on one side of the support frame 113.
15 is rotatably mounted on a shaft 116 at its bent portion, and one release piece 117 of this control lever 115 is moved forward so that the roller 69 of the cam plate 68 engages with the rotation of the release piece 117. The other stopper piece 118 of the control lever 115 is extended and the other stopper piece 118 of the control lever 115 is connected to the engagement protrusion 10 of the rotating wheel 91.
The stopper piece 118 has a side plate 1 on the one side at the rear upper part of the stopper piece 118.
A protruding piece 120 is provided to protrude and engage with a locking portion 119 formed on the front edge of 14. Further, a rotating piece 122 having an inclined lower end and a pushing piece 121 for switching and correcting the switching lever 93 is attached to the rear part of the side plate 114 on one side so as to be rotatable by a support shaft 123. A coil spring 1 is installed between the piece 122 and the stopper piece 118 of the control lever 115.
24 is tensioned, and the pushing piece 121 is locked to the lower edge of one side plate 114 and held in position by the coil spring 124, and the release piece 117 of the control lever 115 is tilted downward. It is set.

Further, a locking piece 125 for locking the engaging protrusion 104 is bent at the rear end of the side plate 114 on one side, and a locking piece 125 for locking the engagement protrusion 104 is formed at the rear end of the side plate 126 on the other side of the support frame 113. The other switching protrusion 127 for controlling the switching of the switching lever 93 is provided in a protruding manner.

Further, the guide roller 109 is connected to the support base 3.
The needle storage frame 29 is rotatably supported on a horizontal shaft 129 of a frame 128 interposed between the rear part of the needle storage frame 29 and the rear part of the needle storage frame 29 .

Next, the operation of the above configuration will be explained.

First, a cassette case 63 containing a large number of needle groups 35 of a fixed length is inserted between the front and rear guide frames 64 of the needle storage frame 29 through the guide port 65 of the operating arm 14. As a result, the needle group 35 at the lowest end within the cassette case 63 falls onto the upper part of the needle pusher 48. Then, the rotating wheel 91 is rotated by the operation described later, and the string 105 is wound in the winding groove 90, and the string 105 is attached to the coil spring 50.
The needle pushing body 48 is pulled back against the force, and the distal end 48a of the needle pushing body 48 retreats backward from the rear guide frame 64, and the needle whose rear end is locked to the rear guide frame 64 is moved back. Group 35 is needle storage frame 2
9 automatically falls onto the guide rail 36. Further, when the winding of the string 105 of the rotating wheel 91 is released by the operation described later, the needle pushing body 48 pushes the fallen needle group 35 forward by the restoring force of the coil spring 50, and launches the needle group 35. Prepare for.

Next, the slider 56 is slid back and forth along the guide shaft 54 according to the binding position of the members to be bound such as sheets of paper, the switch lever 55 is set and held at a predetermined position, and the power switch is turned on. 62 is closed. Then, when the member to be bound is inserted between the needle holder 7 on the support base 3 and the needle storage frame 29 and the switch lever 55 is pushed at the insertion end, the switch lever 55 is tilted in the pushing direction. , when the interlocking piece 57 is pushed up and rotated against the coil spring 58 at the upper part, the rear end of the interlocking piece 57 touches the limit switch 5.
9 is pushed, the limit switch 59 is activated and the motor 5 is started. By starting the motor 5, the input gear 84 is interlocked via the drive belt 87, and the relay gear 79 is driven by the drive gear 83 attached to the drive shaft 82 of the input gear 84.
An intermediate gear 77 attached to this via a relay shaft 78 is rotated in conjunction with the intermediate gear 77 . As the intermediate gear 77 rotates, the switching interlocking gear 89 and the interlocking gear 67 meshed on both sides of the intermediate gear 77 are simultaneously rotated, but at this time, they are aligned coaxially with the switching interlocking gear 89 on one side. The switching lever 93 of the rotary wheel 91 provided is pushed and rotated in advance around the support shaft 94 as described later, and the engaging protrusion 95 and the engaging protrusion 97 at one end are pushed out and deflected outward. At the same time, the slider 98 at the other end is engaged with the inner end of the arcuate guide groove 99, and in this state, the spring 10
Since it is elastically supported by the engaging portion 103 of No. 2,
The locking protrusion 92 of the switching interlocking gear 89 does not engage with the engaging protrusion 95 of the rotating wheel 91, and therefore the switching interlocking gear 89 engages with the intermediate gear 77 without interlocking the rotating wheel 91. and rotate in conjunction with each other.

On the other hand, the interlocking gear 67 meshed with the other side of the intermediate gear 77 is interlocked and rotated by the intermediate gear 77, and the rotating shaft 67 to which the interlocking gear 67 is fixed
The crank disks 25 on both sides fixed to both ends of the rotating shaft 66 are rotated in conjunction with each other, and the rollers 26 attached to eccentric positions of the crank disks 25 on both sides push the vertical state 23 of the pair of drive arms 24. Rotate while doing so. As a result, the pair of drive arms 24 are rotated counterclockwise in FIG.
The tip ends of the rollers 18 on both sides of the actuating arm 14
Push downward. Then, the actuating arm 14 rotates counterclockwise in FIG. 1 against the compression spring 28, using the elevating horizontal rod 13, which is pushed up to the upper end of the guide groove 11 by the compression spring 28, as a fulcrum. At the same time as the needle storage frame 29 is lowered, the needle storage frame 29 whose front end is connected to the front end of the operating arm 14 by a connecting fitting 33 against the compression spring 34 at the rear end is similarly rotated and lowered. The lower end of the closing body 41 at the distal end abuts against the upper surface of the member to be bound.

At the same time, the pair of drive arms 24 are further rotated counterclockwise in FIG. The needle push-out blade 19 is lowered, and the needle push-out blade 19 is moved between the guide edges 38 on both sides of the mounting frame 31 at the tip of the needle storage frame 29 and the closure body 4.
One needle 35 at the forefront of the needle group 35 is lowered along one guide protrusion 44 and pushed forward from the guide edge 37 at the tip of the guide rail 36 at its lower end.
a is pressed on its horizontal part and the second and subsequent needles 35
It is separated and lowered from a and is pressed down along the guide portion 39. Both legs of the needle 35a are press-fitted into the member to be bound by the pressing force of the needle extrusion blade 19, and the legs gradually move from the lower end along the inclined guide surfaces 73 of the pair of needle bending tables 72. bent inward.

In addition, the pair of drive arms 2
Since the interlocking gear 67 that is coaxial with the crank disks 25 on both sides of the interlocking gear 4 is rotated, the cam plate 68 attached to one side of the interlocking gear 67 is also rotated at the same time, and the eccentric position of the cam plate 68 is The roller 69 attached to the push-up lever 70 engages with the rear end of the push-up lever 70, and as the roller 69 rotates, the push-up lever 70 is rotated clockwise in FIG. A pair of needle bending stands 72 connected to the upper part of the needle bending stand 71 through an inner guide surface 73 respectively.
The needle 35a is rotated so as to push up the needle 35a, so that the needle 35a is bent almost horizontally on the lower surface of the member to be bound.
Both legs are further pressed and bent toward the inner surface of the member to be bound by the guide surfaces 73 of the pair of needle bending tables 72, and the ends of the legs are press-fitted into the member to be bound,
The members to be bound are bound. Then, the crank discs 25 on both sides are further rotated in conjunction with each other, and the rollers 26
As the pair of drive arms 24 enters the return rotation, the push of the pair of drive arms 24 against the vertical portion 23 by the rollers 26 is gradually released, and the pair of drive arms 24
roller 1 of actuating arm 14 by horizontal portion 22 of
The pressure on 8 is gradually released. At the same time, due to the restoring force of the compression spring 28, the operating arm 14 is gradually rotated back while interlockingly rotating the pair of drive arms 24 counterclockwise in FIG.
Due to the restoring force of the compression spring 34, the needle storage frame 29
is gradually rotated back and raised to a predetermined position and stopped, while the actuating arm 14 is further rotated back and raised to a predetermined position and stopped, and the needle extrusion blade 19 at the tip is moved to the needle storage position. It is pulled up to a predetermined position from the guide part 39 formed on the mounting frame 31 of the frame 29, and is ready for the next driving operation.
A needle group 35 is attached to the guide portion 39 after the needle extrusion blade 19 is pulled up.
The second needle 35a is pushed out by the guide portion 39, and is prepared for the next stapling operation by the needle pushing blade 19. Also, due to the rotation of the cam plate 68, the cam 68
When the user a pushes the actuator 76 of the limit switch 75, the limit switch 75 operates, and the limit switch 75 continues to operate until the valley 68b of the cam 68a reaches the position of the actuator 76, and the motor continues to operate until the limit switch 75 is opened. By setting the motor 5 so that it continues to rotate, and therefore one entire movement corresponds to one rotation of the self-holding cam plate 68, the electronic control circuit causes the motor 5 to instantly rotate after a certain rotation. Stop.

In the above case, that is, when the thickness of the member to be bound is particularly thick, the lower end of the closure body 41 comes into contact with the upper surface of the member to be bound by the downward rotation of the operating arm 14, and the needle pushing blade 19 descends. However, due to the thickness of the material to be bound, it becomes difficult for the needle pushing blade 19 to descend any further.

On the other hand, due to the rotation of the crank disks 25 on both sides, the pair of drive arms 24 are further forced to rotate in the counterclockwise direction in FIG. The base end 14a of the actuating arm 14 is
The side is lowered against the elasticity of the compression spring 28, and the elevating transverse rod 13 is lowered along the guide groove 11 via the guide roller 12, and the entire operating arm 14 is rotated about the elevating transverse rod 13 as a fulcrum. is forcibly rotated counterclockwise as shown in Figure 1.

Therefore, the actuating arm 14 is provided with a compression spring 28.
Mitigation measures prevent mechanical damage,
If a constant load is applied to the tip of the actuating arm 14, no further load will be applied to the tip of the actuating arm 14, and regardless of the thickness of the member to be bound, the constant pushing force of the needle extrusion blade 19 will always keep the member to be bound. The spelling work is done.

The needles 35a of the needle group 35 stored in the needle storage frame 29 in this way are moved to the needle pusher 48 one by one.
This is pushed out by the needle pusher blade 19 and driven into the members to be bound, so that the members to be bound are continuously stapled.

Next, the needle pusher 48 moves to the coil spring 50.
As a result, the needle 35a is sequentially advanced as the needle 35a is consumed, and the string 105, one end of which is fixed to the needle pusher 48, is sequentially rewound from the rotary wheel 91 around which it is wound.

Then, the needle pusher 48 advances to the front part of the needle storage frame 29 and the needle 35a inside the needle storage frame 29 is moved.
When a predetermined point in time is reached when the number of strings 10
A switching protrusion 97 protruding to the outside of the switching lever 93 of the rotary wheel 91 that was rotating to rewind 5.
As it rotates, it comes into contact with the other switching protrusion 127 protruding from the other side plate 126 of the support frame 113, the switching protrusion 97 is pressed, and the switching lever 93 is supported against the spring 102. The shaft 94 is pushed and rotated as a fulcrum, and the engaging protrusion 95 and switching protrusion 97 at one end are pushed back and moved inward in the center direction of the rotary ring 91, and the slider 98 at the other end is moved to and engaged with the outer end of the arcuate long guide groove 99, and this state is held resiliently by the engaging portion 103 of the spring 102.

During this time, the interlocking gear 8 is switched by the intermediate gear 77.
9 is interlocked and rotated so that it rotates once for each binding operation, so that the switching operation of the switching lever 93 of the rotating wheel 91 causes the switching interlocking gear 89 to engage with the engagement protrusion 95 of the switching lever 93. The locking protrusion 92 abuts and engages, and this locking protrusion 92 prevents the rotating wheel 91 from rotating in the unwinding direction of the string 105 via the switching lever 93. The switching interlocking gear 89 rapidly interlocks and rotates the rotating wheel 91 in the winding direction of the string 105 through the coupling between the switching gear 89 and the locking protrusion 92 that locks the switching gear 89 . Due to the rotation of the rotating wheel 91, the string 105 is guided by the concave groove 80 of the guide wheel 81 and rapidly wound in the winding groove 90. The needle pusher 48, whose one end is locked, is rapidly retreated along the guide rail 36 against the coil spring 50. Then, the string section 105 of the rotating wheel 91
Due to the winding rotation, the switching lever 93 passes inside the pushing piece 121 which is elastically supported by a coil spring 124 on the side plate 114 on one side of the support frame 113, and also passes through the tip of the needle pushing body 48. The portion 48a is retracted backward from the rear guide frame 64 of the needle storage frame 29, its rear end portion is locked to the rear guide frame 64, and the next needle group 35 positioned on the retracting needle pusher 48 is It automatically falls onto the guide rail 36 in the needle storage frame 29.

Next, when the switching protrusion 97 of the switching lever 93 that has passed under the push piece 121 of the support frame 113 comes into contact with one of the switching protrusions 96 of the mounting frame 74, this switching protrusion 97 is pressed and , switching lever 9
3 is pushed and rotated about the support shaft 94 against the spring 102, the engaging protrusion 95 and the switching protrusion 97 at one end are moved outward in the direction of the center of the rotating wheel 91, and the other end The slider 98 has an arcuate guide groove 99.
When the engagement protrusion 95 moves to the inner end of the switching gear 89 and is held in this state by the engagement portion of the spring 102, the engagement protrusion 95 that has moved almost simultaneously engages with the engagement protrusion of the switching gear 89. It automatically separates from the piece 92. As a result, the rotation lock of the rotation wheel 91 in the winding direction of the string 105 is released, and the needle pusher 4
The needle pusher 48 is moved forward by the restoring force exerted by the coil spring 50 of No. 8, and is instantly wound back around the string 105 that is locked to the needle pusher 48, so that the rotating wheel 9
1 is reversely interlocked in the rewinding direction, but this rotating wheel 9
1 is slightly reversed, the engagement protrusion 104 protruding from the inner outer edge of the rotating wheel 91 engages the support frame 113.
Stopper piece 11 of control lever 115 held against
8, and the rotation of the rotary wheel 91 in the unwinding direction is temporarily locked. In other words, the tip 48a of the needle pusher 48 that has advanced through the string 105 does not reach the front, but is locked so that it stops approximately in the middle of the front and rear guide frames 64. For this reason, the rotating wheel 9
1 is rapidly rotated via the string 105 by the return force of the coil spring 50 that urges the needle pusher 48 forward, the needle overruns and the switching lever 93 collides with the switching protrusion 127 and is switched. This is accompanied by a safety mechanism to prevent malfunctions such as repeating the winding operation every time the stapling operation is performed. 35 is pushed forward all at once, and the needle 3 at its tip
5a is strongly struck against the guide protrusion 44 of the closure body 41, and the needle 35a is prevented from being crushed and deformed by the impact. Therefore, it is possible to eliminate the cause of the needle 35a being bent and becoming jammed between the part where the needle 35a is ejected, that is, between the closing body 41 and the attachment frame 31, and causing trouble in the next ejecting. Note that if the shortened needle group 35 remains in the needle storage frame 29, the needle pusher 48 will stop near the rear guide frame 64 due to the newly fallen needle. Do not subject it to strong impact. In this state, the needle pusher 48 continues to push the needle and the normal stitching operation can be continued. In the above case, the switching operation of the switching lever 93 is incomplete, and for example, the locking rod 100 protruding from the slider 98 at the other end
is caught in the middle of the chevron-shaped part of the engaging part 103 of the spring 102, and the slider 98 is caught in the middle of the arcuate guide groove 99.
When the rotary wheel 91 is rewinding, the switching protrusion 9 of the switching lever 93
7 is engaged with the upper side of the pushing piece 121 elastically supported by the support frame 113 and is pushed, so that the switching lever 93 is always rotated, and the slider 98 is pushed against the engaging part of the spring 102. 103 and is engaged with the inner end of the arcuate guide groove 99, and the engaging protrusion 95 is completely separated from the locking protrusion 92. The same applies when the switching protrusion 97 of the switching lever 93 passes under the pushing piece 121 as in the above operation.

On the other hand, when the interlocking gear 67 that drives the pair of drive arms 24 that operate the actuation arm 14 is rotated during the binding operation of binding materials to be bound, the cam plate 68 integrated with the interlocking gear 67 simultaneously rotates. Therefore, every time this cam plate 68 rotates, the cam plate 68
The roller 69 installed at the eccentric position of the control lever 1
15 while pushing up the release piece 117. At this time, if the string 105 is relaxed, that is, if the needle falls into the needle storage frame 29 and the needle pusher 48 stops near the rear guide frame 64, the release piece 117 will be released by the next stapling operation. pushed up,
Even if the stopper piece 118 rotates, the rotary wheel 91 is not urged to rotate, so it will not come off the engagement protrusion 104. Then, by the binding operation, the needle 35
a is consumed, the needle pusher 48 gradually moves forward, and the string 1
05 becomes tensioned and the rotational force is applied to the rotational wheel 91, the release piece 1 of the control lever 115 is released.
17 is pushed up by the roller 69, the stopper piece 118 rotates and is removed from the engagement protrusion 104, and the stopper piece 118 is positioned on the outer peripheral surface of the engagement protrusion 104, and the needle is pushed by the coil spring 50. Since the string 105 is pulled without interfering with the forward movement of the moving body 48, the string 105 is unwound from the rotating wheel 91. When the number of needles 35a in the needle storage frame 29 reaches a predetermined point, the switching protrusion 97 of the switching lever 93 of the rotary wheel 91 is switched again to the other switching protrusion 127 as described above.
The entire switching lever 93 is rotated about the support shaft 94 against the coil spring 102, and the engaging protrusion 95 of the switching interlocking gear 89 is rotated. 92, and the rotary wheel 91 is again connected to the string 10 by the switching gear 89.
5 is rotated in conjunction with the winding direction.

〔Effect of the invention〕

According to the present invention, the needle group filled in the needle storage frame can be reliably pushed toward the guide section by the needle pushing body biased toward the guide section. This forward movement allows the string wound around the winding wheel to be rewound in preparation for filling the next needle group. Then, the most advanced needle of the needle group pushed out to the guide section of the needle storage frame is placed in the needle holder by the needle pushing blade of the operating arm, which is forcibly rotated downward by the driving arm against the compression spring. It can be extruded reliably. Furthermore, when the needle group decreases and the string is rewound by a predetermined length by the needle pusher, the switching lever of the winding wheel is locked to the locking protrusion of the drive wheel, and the winding wheel is moved in the unwinding direction. At the same time, the drive wheel automatically rotates the take-up wheel in the string winding direction, and the rotation of the take-up wheel moves the needle pusher through the string. can be forced to retract in preparation for filling the needle group. Furthermore, when the needle pusher is retreated to a position where the needle group can be filled, the switching lever of the winding ring is switched by the switching protrusion, and the engagement with the locking protrusion is automatically released, and the winding ring is automatically disengaged from the locking protrusion. When the take-up ring is automatically rotated in the unwinding direction via the string by the biasing force that urges the needle pusher, the control lever is engaged with the engagement protrusion of the take-up ring. The rotation of the take-up ring can be reliably prevented,
This prevents the needle pushing body from suddenly pushing the needle group all at once and hitting the ejection guide at the tip of the needle storage frame, crushing and deforming the needles and making them unusable. It is possible to reliably prevent this, and it is also possible to prevent the needle pushing body from rapidly advancing when the staple is not inserted, and also to temporarily prevent the rotation of the take-up ring in the unwinding direction. The engagement of the control lever that is blocked by the rotation of the cam plate is gradually released, and the needle pushing body can smoothly push the needle group one after another in conjunction with the unwinding rotation of the winding ring. can. Therefore, by the operation of the needle pusher, the needle groups can be supplied and the supplied needle groups can be smoothly and reliably pushed into the guide part without the needles clogging the guide part, and the stitching operation can be carried out reliably and steadily. It can be done smoothly.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a perspective view of the electric stapler from one side, Fig. 2 is a perspective view of the same from the other side, and Fig. 3 is a plan view of the internal structure of the same. Fig. 4 is an exploded perspective view of the same as above, Fig. 5 is a partially cutaway side view of the operating mechanism of the needle pusher as above;
FIGS. 6 to 8 are explanatory views of the same operation. 7... Needle cradle, 14... Operating arm, 19...
Needle extrusion blade, 24... Drive arm, 28... Compression spring, 29... Needle storage frame, 35... Needle group, 3
5a... Needle, 48... Needle pushing body, 50... Coil spring, 68... Cam plate, 89... Drive wheel,
90... Winding groove, 91... Winding ring, 92... Locking protrusion, 93... Switching lever, 96... Switching protrusion,
104... Engaging protrusion, 105... Strap, 115...
...control lever.

Claims (1)

[Scope of Claims] 1. A needle holder, and a guide part for pushing out the needle faces the needle holder, and a needle pusher for pushing the needle is biased toward the guide part so as to be able to move forward and backward. A needle storage frame that can be raised and lowered, and a top portion of the needle storage frame that is rotatably supported in the vertical direction via a compression spring, and a needle stored in the needle storage frame at the tip thereof is moved from the guide section to the needle storage frame. an actuation arm having a needle extrusion blade that pushes out a needle to a cradle; a drive arm rotatably supported on one side of the actuation arm and having its tip engaged with the front part of the actuation arm; and the needle storage frame. a winding wheel having a winding groove on its outer periphery for winding a string that advances and retreats a needle pushing body provided therein, and a winding ring having a rotatably supported switching lever and an engaging protrusion; It is interlocked and connected to the drive system of the arm, and is locked to the switching lever of the winding wheel to prevent the winding wheel from rotating in the direction of unwinding the string, and also to rotate the winding wheel in the direction of winding the string. a driving wheel having a locking protrusion; a switching protrusion that is provided on the winding wheel and switches and rotates the switching lever to release the engagement with the locking protrusion after winding the string; a control lever that is rotatably provided with respect to the winding wheel and that locks onto an engaging protrusion of the winding wheel that rotates in the rewinding direction by the switching operation of the switching lever to prevent the rotation thereof; An electric stapler comprising: a cam plate that is interlocked with the drive system of the drive arm and rotates the control lever to release the engagement with the engagement protrusion.