JPH0647663Y2 - Overload prevention device for electric stapler - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric stapler for driving a driver actuating member having a driver at its tip by driving from an electric motor, and driving out staples by the driver to bind sheets and the like. The present invention relates to an overload prevention device that prevents overload on an electric motor or its related mechanical parts that may occur in connection with a driver driving operation.

[0002]

2. Description of the Related Art As an electric stapler of this type,
For example, JP-B-63-44512 and JP-A-62-236.
The structure shown in No. 684 and the like is known. These electric staplers include a clincher provided at the front end of a base forming a driver body, a fixed magazine having a staple ejection opening corresponding to the clincher, and ejecting staples from the ejection opening toward the clincher. It is composed of a vertically movable driver and a driver operating device.

The driver actuating device includes a driver actuating member having the driver at the front end thereof and a supporting shaft serving as a rotation fulcrum at the rear end thereof, and an intermediate portion in the longitudinal direction of the driver actuating member. It is composed of a link mechanism or a gear mechanism which is operatively connected and is operable to receive a driving force from the electric motor to rotate the driver operating member around the support shaft to vertically move the driver. And a driver vertical movement means.

[0004]

However, in the above-mentioned conventional electric stapler, when the paper thickness of the paper to be stapled by the staple is large or the paper itself is too hard, the driver can sufficiently remove the staple from the ejection opening. A situation may occur in which the driver cannot be launched and the lowering operation of the driver is restricted during the launch operation. In such a case, since the electric motor and the driver up-and-down moving means are trying to continue to operate even though the rotation of the driver operating member is stopped, these parts are overloaded and the motor is damaged or damaged. There is a problem in that the links and gears that make up the driver vertical movement means are damaged.

Therefore, when performing the stapling operation of the sheets using this kind of electric stapler, there is an inconvenience in use that the user must pay attention to the thickness and hardness of the sheets to be stapled in advance. It was

The present invention has been made in view of the above-mentioned problems in the conventional electric stapler. The purpose of the present invention is to restrain the descent operation of the driver due to the fact that the thickness of the paper to be spelled is too large in the electric stapler. In such a case, an electric stapler that can be used safely and easily for a long time without giving an overload to the driver drive system electric motor or damaging related mechanical parts is provided. In order to obtain, an overload protection device provided in the electric stapler is provided.

[0007]

In order to achieve the above object, in the present invention, a stapler main body, an electric motor mounted on the main body, a driver at the front end and a rotary end at the rear end are provided. A driver actuating member to which a support shaft forming a dynamic fulcrum is attached is operatively connected to a longitudinal intermediate portion of the driver actuating member, and receives a driving force from the electric motor to move the driver actuating member around the support shaft. In an electric stapler having a driver up-and-down moving means operable to move the driver up and down by moving the support shaft up and down, the support shaft is fitted and the support shaft is moved in a direction along the longitudinal direction of the driver operating member. The stapler body is formed with a long hole for regulating the vertical movement of the support shaft, and an elastically deformable member is attached to the support shaft, and the support shaft is supported through the elastically deformable member. Solid A base surface is provided, and the elastically deformable member is elastically deformed on the fixed base surface when the driver up-and-down moving means operates, thereby allowing the up-and-down movement within the elongated hole of the support shaft. The present invention proposes an overload prevention device.

[0008]

In the electric stapler equipped with the overload preventing device having the above-mentioned structure, for example, the staple cannot be sufficiently bound into the sheet by the descending operation of the driver because the sheet is excessively thick, and the driver cannot be stapled. When the driver is constrained, the driving force is further applied to the driver actuating member in the driver descending direction by the continuous operation of the electric motor and the driver up-and-down moving means. At this time, the elastically deformable member around the support shaft is fixed to the base. Elastically deforms to the surface. As a result, the support shaft can move within the slot according to elastic deformation. Therefore, the link mechanism and the gear mechanism, which form the driver up-and-down moving means, can carry out one cycle of the stapling operation without being overloaded, even though the driver portion is restrained. In addition, a situation where the electric motor is damaged is avoided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric stapler having an overload preventing device according to an embodiment of the present invention will be described below with reference to the drawings.
In FIGS. 1 and 2, reference numeral 1 is a base forming a stapler main body of a substantially rectangular plate forming a main body frame. The upper surface of the base 1 is along the longitudinal direction and is located at the left end (front end) in FIG.
1a is formed to be one step lower than the other portions, and forms a space for inserting a binding sheet. A clincher metal fitting 2 having a staple bending groove 2a and forming a clincher is fitted in the front end portion 1a in a state of being flush with the upper surface of the base.

Reference numeral 3 denotes a fixed magazine for supplying the staples 4, which extends in the front-rear direction (horizontal direction in FIG. 1) in parallel with the upper surface of the base 1 and is fixedly arranged on the base 1. There is. At the front end portion (left end portion in FIG. 1) of the magazine 3, a staple ejection port 5 is opened downward so as to face the staple bending groove 2a at a predetermined interval. . And this launch port 5
A binding sheet insertion portion 6 is formed between the front end portion 1 a of the base 1 and the front end portion 1 a.

Reference numeral 7 is a motor drive limit switch,
As shown in FIG. 1, it is arranged below the front end portion 1a of the base 1, and its operating piece 7a faces the inside of the binding sheet insertion portion 6.

Reference numeral 8 denotes a staple feeding tool for pressing and holding the staples 4 lined up in the magazine 3 toward the staple ejection port 5 by a spring bias.

9 is a magazine 3 as can be seen especially in FIG.
Is a magazine guide member arranged so as to cover the above from above, and guides the magazine 3 slidably in the front-rear direction or the longitudinal direction. The guide member 9 is fixed to the base 1 with screws 90. Therefore, the magazine 3 and the magazine guide member 9 are integrated with the base 1 and cannot move up and down, and form a part of the base.

Reference numeral 11 denotes a magazine lock release button rotatably supported at the rear end portion (right end portion in FIG. 1) of the guide member 9, and the magazine 3 is normally held at the storage position shown in FIG. The lock is released by pressing the button 11 when the magazine 3 is pulled out for holding and holding the staples and loading the staples.

Reference numeral 12 denotes a driver actuating member arranged along the longitudinal direction of the base 1 (left-right direction in FIG. 1), which is arranged so as to face both sides of the magazine guide groove of the magazine guide member 9. A pair of side walls 12a, 12a and both side walls 12 at the tip (the left end in FIG. 1) thereof.
There is a connecting portion 12b formed by connecting the upper portions of a and 12a, and the driver 10 is bent and formed integrally with the connecting portion 12b. The driver actuating member 12 has side walls 12a, 12 at its rear end (the right end in FIG. 1).
It is rotatably supported by a support shaft 13 provided at the rear end of the magazine guide member 9 through shaft holes 12c, 12c formed in a. The support shaft 13 is attached to the magazine guide member 9,
It is slidably engaged and guided in an elongated hole 14 formed in the up-down direction. However, the support shaft 13 is movable only in the vertical direction of the base 1 by the elongated hole 14, and has a dimensional relationship such that it cannot move in the longitudinal direction of the base 1. Also, the support shaft 13
Bearing rings 15 and 15 which are elastically deformable members are fixed to both ends of and are mounted on a fixed base surface 91 of a magazine guide member 9 which is a part of the base 1. The bearing ring 15 is made of an elastically deformable material such as urethane rubber.
Then, as will be described later, these elongated holes 14, bearing rings 15,
The component portion of the base surface 91 constitutes an overload prevention device that functions to prevent overload of the electric motor and its related mechanical portion.

Reference numeral 16 denotes a casing which is erected in a fixed state at a substantially central portion of the base 1, and is formed in a U shape along both sides of the magazine guide member 9. The fixing to the base 1 is made by the flange portions on both sides of the casing 16.
A motor mounting casing 17 is integrally fixed to the upper side of the casing 16. The casing 16 has a slider guide plate 2 extending in the horizontal direction.
1 is fitted and fixed, and the inside of the casing 16 is vertically divided into two by this guide plate 21.

As described above, the casings 16 and 17 and the slider guide plate 21 are fixedly attached to the base 1 together with the magazine guide member 9 to form a part of the base.

The above-mentioned slider guide plate 21 extends above and in parallel with the magazine guide member 9 in the front-rear direction. As shown in FIG. 2, the guide plate 21 has a slider guide groove 22 formed by bending on the upper side in the front-rear direction or the longitudinal direction by pressing. A slider 23 is slidably fitted in the guide groove 22 in the front-rear direction. A guide hole 24 is formed in the guide groove 22 in the front-rear direction, and a guide 25 protruding from the guide groove 22 is formed. Is relatively slidably engaged with this. Further, adjacent to this, a guide hole 26 is formed in the center and the front-rear direction also in the rear region, and the large-diameter base portion 27a of the cam shaft 27 protruding in the guide groove 22 is relatively slidable relative thereto. Is engaged with. Further, a cam stud member 28 that engages with a grooved cam member 31 to be described later is protrudingly provided at the rear end portion of the upper surface of the slider 23, and elongated holes 29a, 29a are formed on both sides of the front end portion in the vertical direction. The engaging members 29, 29 are provided so as to project upward.

Reference numeral 31 is a groove cam member, and a large diameter spur gear 32 is integrally provided on the upper surface side thereof. The groove cam member 31 is rotatably supported by the cam shaft 27. Further, as shown in FIG. 3, on the back surface side of the groove cam member 31, a continuous and irregularly shaped cam groove 33 which is asymmetric with respect to the moving direction XX of the slider 23 is formed.
The radius line P that minimizes the distance between the rotation center of No. 1 and the cam groove 33 and the radius line Q that maximizes the distance in the direction opposite to the direction of rotation of the groove cam member 31 exceed 180 °, for example, 250 °.
And the rotation start position of the radial line P is X
-It is on the X-ray. That is, when the grooved cam member 31 rotates 250 ° in the rotation direction, the radius line Q comes to be on the line XX. The cam stud member 28 is slidably engaged in the groove 33. When the groove cam member 31 makes one full rotation in the clockwise direction shown by the arrow in FIG. In the drawing, as indicated by the chain line, the radial line P of the groove cam member 31 moves backward while rotating 250 ° from the rotation start position, and while moving back from the rotation angle position to the original position, it moves forward. In the backward movement, that is, along the movement direction X-X, the forward movement takes a long time and the backward movement takes a short one reciprocating slide movement.
Due to the length of the required time, the ejection of the staples can be reliably performed over time, and thereafter, the drive system can quickly return to the original state. Also,
The groove cam member 31 has a cutout portion 34 in a part of its circumference,
The electric motor is stopped when the cutout portion 34 comes to a position corresponding to the operating piece 35a of the motor stop limit switch 35 provided on the side wall of the casing 16 as shown in FIG. As a result, the groove cam member 31 is automatically stopped every one rotation, and the stapler performs one cycle of binding operation during this period.

On the upper surface of the motor mounting casing 17,
An electric motor 36 is placed at the center of the front end, and its motor shaft 3
6a projects vertically downward toward the inside of the casing 16. A small gear 37 is connected to the motor shaft 36a. The casing 16 is provided with a first spur gear having gears 38 and 39 vertically integrated and a second spur gear similarly having gears 40 and 41 integrally supported, respectively, which are suspended and fixed to the upper wall of the casing 16. Rotatably supported on the shaft, the first spur gear meshes with the pinion gear 37 and the second spur gear,
The second spur gear meshes with the large diameter spur gear 32.

The small gear 37 of the motor shaft 36a, the first and second spur gears, and the large-diameter spur gear 32 are successively meshed as described above to form the reduction gear group 42, and the rotation of the electric motor 36. Is decelerated and transmitted to the groove cam member 31. Each of these gears has a horizontal surface of rotation in a state of being stacked in parallel with the groove cam member 31.

Reference numeral 51 denotes a toggle link mechanism, one end of which is a pair of first link members 52 pivotally supported by the fixed casing 16 via a support shaft 52a, and one end of which is the other end of the first link member 52. To the driver operating member 12 via a support shaft 53a and the other end is linked to the drive operation member 12 via a support shaft 57a.
And a second link member 53 pivotally supported in the middle portion or substantially the center portion of the slider 23. The middle support shaft 57 is engaged with the engaging member 29 of the slider 23 so as to be vertically slidable in the elongated hole 29a. Are connected in a manner. The mode in which the first and second link members 52 and 53 form a pair is as shown in FIG.

Therefore, in accordance with the sliding movement of the slider 23 along the horizontal plane, the toggle link mechanism 51 has a support shaft 57.
The linking members 52, 53 receive the moving force via
The bending angles of the two are displaced, and the support shaft 53a forming the movable joint receives the transmission force doubled by the boosting action of the toggle link mechanism 51 with respect to the support shaft 52a forming the fixed joint. The actuating member 12 rotates around the support shaft 13 so that the driver 10 is moved up and down. That is, the toggle link mechanism 51 includes the reduction gear group 4
Together with 2, a driver up-and-down moving means for operatively connecting the electric motor 36 and the driver operating member 12 is formed.

Reference numeral 54 denotes a bottom cover, which covers the lower side of the base 1 and has a drive battery 55 for the motor 36 built therein. Further, on the upper side of the base 1, a body cover 56 having a substantially triangular shape when viewed from the side is provided, and an upper portion 5 of the cover 5 is provided.
Since 6a has a middle-height shape and is easy to hold, it functions as a grip portion, and a drive transmission type including a motor 36 is disposed therein.

According to the electric stapler of the embodiment described above, the binding operation of the sheets to be bound is performed as follows.

That is, as shown in FIG.
Is inserted into the spelling sheet insertion section 6 and the insertion end of the spelling sheet 61 presses the operating piece 7a of the limit switch 7, the electric motor 36 is started to rotate. The rotation of the motor 36 is
The speed is reduced by the reduction gear group 42 and transmitted to the grooved cam member 31. As a result, the groove cam member 31 rotates clockwise from the original position shown in FIG. 3, and along with this rotation, the slider 2
3 slides backward due to the relationship between the cam stud member 28 and the cam groove 33. When the groove cam member 31 starts to rotate, the notch 34 is disengaged from the position corresponding to the operating piece 35a of the limit switch 35, the operating piece 35a engages with the outer peripheral edge of the groove cam member 31, and The cam member 31 is pressed and held until the end of one rotation, so that the rotation of the cam member 31 can be prevented even if the operating piece 7a of the micro switch 7 is opened.
It is supposed to continue. In response to the rotation of the groove cam member 31, the first and second link members 5 of the link mechanism 51.
Since the mutual angles of the reference numerals 2 and 53 open from the state of FIG. 1 and the support shaft 53a is pushed downward, the driver actuating member 12 rotates around the support shaft 13 in the counterclockwise direction in FIG. , The driver 10 at the tip descends. As shown by the chain line in FIG. 3, the groove cam member 31 further rotates, and it takes a long time until the rotation angle reaches 250 degrees, and the slider 23 moves to the stroke end on the rightmost side, and here, the toggle link mechanism 51. 4 is in the most stretched state as shown in FIG. 4, the driver 10 ejects the staples 4 with a boosting action, and the binding operation of the binding sheets 61 is performed.

After the binding operation is completed, the groove cam member 31 continues to rotate until the rotation is completed.
Indicates a sliding movement in the returning direction, and the toggle link mechanism 51 accordingly returns to the state of FIG. 1 in a short time (fast return),
The driver 10 moves up. When the rotation of the grooved cam member 31 approaches one rotation, the notch 34 again comes to the operating portion of the operating piece 35a of the motor stop limit switch 35, and the pressing of the operating piece 35a is released, so that the limit switch 35a is released.
The motor 36 is stopped by the operation of, and one cycle of the binding operation is completed.

In the binding operation, when the driver 10 ejects the staple 4, the staple 4 cannot penetrate the binding sheet 61 because the binding sheet 61 is too thick, and the descending operation of the driver 10 is restricted. In this case, since the electric motor is still driven, the toggle link mechanism 51 continuously applies the forced driving force to the driver operating member 12. However, in this case, the bearing ring 15 supporting the support shaft 13 is elastically deformed and absorbed. That is, in this case, the bearing ring 15 is pressed by the base surface 91 and elastically deformed to move the support shaft 13 downward in the elongated hole 14 to allow it to escape, so that no constraint force is exerted on the toggle link mechanism 51 itself. . Therefore, even if the driver 10 is restrained as described above and the lowering operation thereof is hindered, the electric motor 36 and the toggle link mechanism 51 and the reduction gear group 42 forming the driver up-and-down moving means are prevented by the overload prevention device. Since no overload is exerted, it is possible to prevent the risk of damage to each member of these parts or a situation such as seizure.

Moreover, when the overload prevention device operates,
Since only the vertical movement of the support shaft 13 is allowed, the driver actuating member 12 does not cause a positional deviation in the longitudinal direction during its rotation, and therefore the corresponding positional relationship between the driver 10 and the staple 4 may be displaced. Absent.

Although the electric stapler overload preventing device of the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. For example, the elastically deformable member may have other shapes such as a rectangular shape in addition to the annular shape as in the embodiment. The support shaft 13 attached to the driver actuating member 12 may be integrally fixed in addition to the embodiment configuration pivotally supported on the member 12. Also, in the example,
Although the toggle link mechanism 51 is used as the driver up-and-down moving means, other configurations such as connecting the gear mechanism directly to the driver operating member are possible, and various changes can be made without departing from the scope of the present invention.

[0031]

As described above, according to the overload prevention device for the electric stapler according to the present invention, the tip end of the driver operating member during the binding operation due to the fact that the thickness of the paper to be bound is large. When the driver in the section is constrained to be unable to descend, the support shaft at the rear end of the driver actuating member can move up and down in the elongated hole by the deformation of the elastically deformable member, so that the driver actuating member is not constrained. The situation in which the link mechanism or the gear mechanism that forms the driver up-and-down moving means connected to the actuating member is damaged or the electric motor is damaged can be avoided, and one cycle of the binding operation can be safely performed. Therefore, the user can use the electric stapler without paying particular attention to the paper to be spelled, and it is possible to improve the convenience and durability of the use of the electric stapler with a simple structure and various practical uses. Produce an effect.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of an electric stapler including an overload prevention device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of main internal components of the electric stapler shown in FIG.

FIG. 3 is a view showing an operational relationship between a groove cam portion and a slider.
It is a sectional view taken along line AA of FIG.

FIG. 4 is an operation explanatory diagram of a main part showing a driver operating state at the time of binding sheets.

[Explanation of symbols]

 1 Base 3 Magazine 4 Staple 9 Magazine Guide Member 10 Driver 12 Driver Actuating Member 13 Support Shaft 14 Long Hole 15 Bearing Ring (Elastic Deformation Member) 91 Base Surface 36 Electric Motor 42 Reduction Gear Group 51 Toggle Link Mechanism

Claims (1)

[Scope of utility model registration request] 1. A stapler main body, an electric motor mounted on the main body, a driver operating member provided with a driver at a front end thereof and a support shaft serving as a rotation fulcrum at a rear end thereof, and the driver. A driver up / down unit that is operatively connected to an intermediate portion in the longitudinal direction of the operating member and is operable to receive a driving force from the electric motor to rotate the driver operating member around the support shaft to move the driver up and down. In an electric stapler including a moving means, a length for guiding the movement of the support shaft in a vertical direction by fitting the support shaft to restrict movement of the support shaft in a direction along the longitudinal direction of the driver operating member. A hole is formed in the stapler body, an elastically deformable member is attached to the support shaft, and a fixed base surface for supporting the support shaft is provided through the elastically deformable member, and the elastic body is provided when the driver vertical movement means operates. Overload preventing apparatus characterized by the form member is adapted to permit vertical movement in the elongated hole of the support shaft is elastically deformed on the base surface of the fixing.