JP2001219403A - Stapler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a stapler by integrally providing a cam mechanism to a swinging mechanism for a nailing unit and a nail bending unit. SOLUTION: In the stapler equipped with a head unit 3 for nailing a sheet bundle, an anvil unit which is arranged opposed to the head unit 3 and bends both ends of the nail driven into the sheet bundle, and a freely swingable movable frame 40 for holding the anvil unit in order to clamp the sheet bandle, a fixed frame 11 for freely swingably supporting the movable frame 40 and a drive shaft 43 provided to the movable frame 40 are engaged with each other by an eccentric cam for one side and by the fixed frame 11 for the other side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stapler for saddle stitching, in which a predetermined number of stacked sheets are stapled by staples.

[0002]

2. Description of the Related Art Conventionally, a stapling unit for driving a needle into a sheet bundle and a bending unit for bending both ends of the needles driven into the sheet bundle are separately provided, and the sheet bundle fed between them is provided. 2. Description of the Related Art A stapler that clamps a stapling unit and a bending unit and bends a leading end of a needle driven into a sheet bundle inward to perform saddle stitching is known (for example, see Japanese Patent Application Laid-Open No. 6-63342).

[0003]

In this type of stapler, a stapling unit and a bending unit are swung by a cam mechanism when clamping a sheet bundle. Since the mechanism for swinging the striking unit and the bending unit and the cam mechanism are separately provided, a space for disposing the cam mechanism must be provided separately, and there is a problem that the stapler becomes large accordingly. Was.

Accordingly, an object of the present invention is to reduce the size of a stapler by integrally providing a cam mechanism with a swing mechanism of a stapling unit and a bending unit.

[0005]

According to a first aspect of the present invention, there is provided a stapling unit for driving a stapler into a sheet bundle, and a stapling unit disposed opposite to the stapling unit to drive a stapler into the sheet bundle. A stapler provided with a bending unit for bending both ends of the inserted needle, and a swingable movable frame for holding at least one of the needle driving unit and the bending unit for clamping the sheet bundle; And a drive rotating body provided on the movable frame, one of which is engaged with a cam and the other of which is engaged with a cam follower.

According to the present invention, since the mechanism for swinging the needle driving unit and the bending unit and the cam mechanism can be provided integrally, there is no need to separately provide a space for disposing the cam mechanism. The stapler can be downsized.

According to a second aspect of the present invention, in the stapler according to the first aspect, the base frame is slidably mounted in a sheet bundle width direction with respect to a drive shaft provided on an apparatus frame.

According to the present invention, the position where the staples are driven can be set freely for the sheet bundle to be saddle-stitched.

According to a third aspect of the present invention, in the stapler according to the second aspect, the movable frame pivotally supported on the drive shaft and the base frame such that the movable frame swings around the drive shaft. The rotation centers are matched.

According to the present invention, the swinging posture of the movable frame with respect to the base frame can always be kept constant, so that a stable stapling operation can be obtained.

According to a fourth aspect of the present invention, in the stapler according to the third aspect, the drive shaft is rotatably supported on an apparatus frame and the drive shaft is connected to a drive motor mounted on the apparatus frame. The rotation of the drive shaft is transmitted to the drive rotator.

According to the present invention, the drive shaft can be used for both the sliding guide of the base frame in the sheet bundle width direction and the drive transmission to the drive rotating body.

According to a fifth aspect of the present invention, in the stapler according to the first aspect, an apparatus frame, at least two base frames slidably mounted on the apparatus frame in a sheet width direction, and The stapling unit is attached to one side, and the bending unit is attached to the other side.

According to a sixth aspect of the present invention, in the stapler according to the fifth aspect, the two base frames are moved in the sheet width direction in synchronization with a single drive motor mounted on the apparatus frame. It is characterized by.

According to the fifth and sixth aspects of the present invention, the stapling unit and the bending unit are driven synchronously by a single drive motor, so that a stable stapler operation can be obtained and the drive mechanism can be simplified and The miniaturization of the entire device is achieved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a stapler according to the present invention will be described in detail with reference to the accompanying drawings. FIG.
FIG. 2 is a schematic diagram of the entire configuration of the stapler according to the present invention, FIG. 2 is a configuration diagram of a stapling unit and a bending unit disposed to face the unit, and FIG. 3 is an exploded perspective view showing the configuration of the bending unit.

As shown in FIG. 1, the stapler S according to this embodiment has a frame structure including a pair of left and right side plates 1a and 1b and a back plate 2 connecting the upper back sides of the side plates 1a and 1b. ing. In addition, the stapler S
As shown in FIGS. 1 and 2, a head unit 3 as a stapling unit and an anvil unit 4 as a bending unit are provided in a vertically divided state.
The head unit 3 located on the lower side separates one staple needle from the staple needle band in which a large number of staple needles are connected in a belt shape, and converts the separated staple needle into a U-shape. The sheet is formed and formed to penetrate in a thickness direction toward a sheet bundle sent between the sheet bundle and the anvil unit 4. On the other hand, the anvil unit 4 arranged opposite to the head unit 3 receives both the legs of the staple needle driven into the sheet bundle, and forms both ends inwardly to form the sheet bundle finally. It is configured to be bound.

The head unit 3 and the anvil unit 4 are supported movably in a direction perpendicular to the sheet bundle feeding direction in synchronization with each other via respective guide mechanisms. Further, the head unit 3 and the anvil unit 4 are configured to move integrally while a relative positional relationship is kept constant by a moving mechanism described later.

As shown in FIGS. 1 and 2, the guide mechanism of the head unit 3 includes a pair of left and right side plates 1a, 1b.
It is constituted by a cylindrical guide shaft 6 spanned between them. A housing frame 7 is provided below the head unit 3.
The guide block 6 is inserted into a guide hole formed in the guide block 8, and guides the sliding movement of the head unit 3.

On the other hand, the guide mechanism of the anvil unit 4 is also constituted by a cylindrical guide shaft 10 bridged between a pair of left and right side plates 1a and 1b, as described above. A guide block 12 integrally provided with the fixed frame 11 is provided on the upper part of the anvil unit 4, and a guide shaft 10 is inserted into a guide hole formed in the guide block 12 to guide the sliding movement of the anvil unit 4. are doing.

The movement of the head unit 3 and the anvil unit 4 along the guide shafts 6, 10 is performed by a moving mechanism. The moving mechanism includes a pair of screw rods 14, 15 rotatably supported at both ends by the left and right side plates 1a, 1b and arranged in parallel with the guide shafts 6, 10. And a motor 16 for driving the motor. The motor 16 is mounted on the shaft of the screw rod 14 on the side of the head unit 3 outside the one side plate 1a.
4 is driven directly, and the driving force of a motor 16 is transmitted via a timing belt 18 to a driven gear 17 fixed to a protruding end of a screw rod 15 on the anvil unit 4 side. Are rotated in the same direction at the same speed. In addition,
A tension roller 19 is elastically in contact with the timing belt 18. The outer peripheral surfaces of the pair of screw rods 14 and 15 are respectively provided with ball screw grooves 20 and 2.
1 are provided, and engagement pins (not shown) protruding from the head unit 3 and the anvil unit 4 are respectively engaged with the ball screw grooves 20 and 21 to rotate the screw rods 14 and 15. Accompanying each unit 3, 4
Can be slid.

Next, the structure and swing mechanism of the head unit 3 will be described with reference to FIGS. In the head unit 3, a head housing 24 is attached to the above-described housing frame 7, and a head 25 disposed in the head housing 24g is swingably supported. A staple needle cartridge is detachably mounted on the head 25. A shaft pin (not shown) of the head 25 is slidably guided in the elongated holes 27 provided on both sides of the head housing 24, and a cam mechanism is engaged with the shaft pin. The cam mechanism includes left and right arm portions 29 that engage with the shaft pins, and a transmission gear 30 that transmits swing to the arm portions 29. Arm part 29
Has a substantially center portion rotatably supported by the housing frame 7,
An elliptical cam hole 31 is provided on the rear side.
The transmission gear 30 has a central portion rotatably supported by the housing frame 7, and a pin 32 projecting from an outer peripheral portion thereof. The pin 32 is inscribed in the cam hole 31. Therefore, when the transmission gear 30 rotates, the pin 32 moves along the inner peripheral edge of the cam hole 31, and the head 25 moves up and down by swinging the arm 29.

The driving of the transmission gear 30 receives a driving force from a driving shaft 33 disposed in parallel with the guide shaft 6. While the housing frame 7 is loosely fitted to the drive shaft 33 having a rectangular cross section, the housing frame 7
The drive gear 34 is fitted on both sides of the drive gear 34. Drive gear 34
Is meshed with the transmission gear 30, and the drive shaft 3
The driving force is transmitted to the transmission gear 30 by the rotation of 3.

Next, the configuration of the anvil unit 4 and the swing mechanism will be described. As shown in FIGS. 1 to 3,
A fixed frame 11 fixed to a guide block 12 is slidably mounted on the guide shaft 10, and the movable frame 40 is swingably supported by the fixed frame 11 in a state of being urged by a coil spring 57. Have been. The anvil unit 4 is swingably attached to the movable frame 40. As shown in FIGS. 4 and 5, a cylindrical collar 42 is provided at the rear end of the fixed frame 11, and the collar 42 is attached to a drive shaft 43 having a rectangular cross section arranged in parallel with the guide shaft 10. It is loosely fitted. The drive shaft 4 is also provided at the rear end of the movable frame 40.
3 is provided with a collar 44 which is loosely fitted, and is fitted inside the collar 42 of the fixed frame 11. Further, a drive gear 70 fitted to the collar 44 is slidably fitted to the guide shaft 43. As described above, since the center of rotation of the movable frame 40 is formed by the fitting of the collars 42 and 44, the swing posture of the movable frame 40 with respect to the fixed frame 11 is always stable.

As shown in FIG. 3, the anvil unit 4 includes an anvil body 45 having a box structure, and a contact plate 47 pressed toward the anvil body 45 by a pair of left and right coil springs 46. Accommodates a clincher swinging portion 48 and a clincher support frame 49. A pair of insertion holes 50 and 51 are formed on the left and right side surfaces of the anvil body 45 at the front and rear, respectively.
The support shaft 52 protruding from the side surface of the movable frame 40 extends through the front insertion hole 50 and is provided on the side surface of the movable frame 40.
Is slidably fitted in In addition, the support shaft 54 protruding from the side surface of the clincher swinging portion 48 is provided with the
5 and 51 are coaxially penetrated and supported by an inverted triangular support hole 56 provided on the side surface of the movable frame 40. As described above, by supporting the support shafts 52 and 54 on the movable member 40, the clincher swing portions 48 are provided in the anvil main body 45.
And an anvil unit 4 in which a clincher support frame 49 is incorporated. The anvil unit 4 can move up and down with respect to the movable frame 40 within the range of the elongated hole 53 and the support hole 56. The left and right frame members of the clincher support frame 49 also have tapered protrusions 58 extending upward, and are inserted into guide holes 59 formed on the upper surface of the movable frame 40. The guide hole 59 is formed wider than the protrusion 58, and allows the anvil unit 4 to swing within a range in which the protrusion 58 moves in the guide hole 59.

A pair of left and right clincher portions 60 are rotatably supported on the front surface of the clincher swing portion 48, and the front end of a substantially L-shaped leaf spring 61 is engaged with the outer end of the clincher portion 60. Has been stopped. This leaf spring 61
As shown in FIG. 6, the central bent portion 62 is
4, and a U-shaped hook portion 63 provided at the rear end is engaged with the roller shaft 64 so that the clincher swing portion 4 is formed.
8 posture. A substantially U-shaped pressing member 67 slid by the rotation of the clincher driving cam 66 is provided on a roller portion 65 provided at the center of the roller shaft 64.
Is in contact. The pressing member 67 allows the roller portion 6
When the front end 5 is pushed forward, the clincher swinging portion 48 swings about the support shaft 54 against the spring pressure of the leaf spring 61, and pushes up and rotates the clincher portion 60 at the tip end. The slits 45a, 49a provided on the lower surfaces of the anvil body 45 and the clincher support frame 49 by the driving of the needle.
The tip of the needle inserted into the anvil body 41 is bent inward by the rotating clincher unit 60. The rotation shaft 69 of the clincher drive cam 66
Is rotatably supported on the side surface of the movable frame 40.

Although the anvil unit 4 is normally urged downward by a coil spring 46 compressed between the movable frame 40 and the anvil unit 4, as shown in FIGS. The amount of rotation varies depending on the thickness of the bundle 68, and the anvil unit 4 when stapling is used.
The amount of pushing up differs. That is, as shown in FIG. 7, when the sheet bundle 68 is thin, the amount of rotation of the anvil unit 4 when clamping is large, so that the amount of pushing up of the anvil unit 4 when driving the needle with the head unit 3 becomes small, The support shafts 52 and 54 of the anvil unit 4 are provided with a long hole 53 and a support hole 5
The sheet bundle 68 is stapled in a state where the sheet bundle 68 is lowered to near the lower end portion. However, as shown in FIG. 8, when the sheet bundle 68 becomes thicker, the amount of rotation of the anvil unit 4 during clamping becomes smaller than in the previous case. In this case, the anvil body 45 is pushed upward by an amount corresponding to the thickness, the anvil body 45 moves toward the movable frame 40 against the spring force of the coil spring 46, and the support shafts 52, 54
3 and within the support hole 56. At this time, the support shaft 54 is movable in the support hole 56, and the protrusion 58 at the tip of the clincher support frame 49 is also movable in the guide hole 59 provided on the upper surface of the movable frame 40. The anvil unit 4 swings about the support shaft 52, and changes the posture so that the lower surface of the anvil body 45 follows the seat surface, and the tip of the driven needle is moved to the anvil body 4
5 to the slit 45a. Thus, the support shaft 5
4 can move freely within the support hole 56 to some extent, and
Since there is a gap between the guide sheet 8 and the guide hole 59, the anvil body 45 can swing about the support shaft 52 as a center of rotation, so that there is no difference in the clinch mechanism due to the difference in the sheet thickness of the sheet bundle 68.

The rotation of the anvil unit 4 is performed by a drive shaft 43 provided in parallel with the guide shaft 10.
This is done by receiving the driving force from As shown in FIGS. 2, 9, and 10, a drive gear 70 is fitted to the drive shaft 43 having a rectangular cross section substantially at the center of the movable frame 40. This drive gear 70 is a transmission gear 71
Through the same rotary shaft 69 as the clincher drive cam 66
It meshes with the driven gear 72 provided above. Also,
At both ends of the rotating shaft 69, half-moon-shaped eccentric cams 73 are arranged on both left and right sides to swing the anvil unit 4 in a narrow space between the fixed frame 11 and the movable frame 40. The eccentric cam 73 uses the fixed frame 11 as a cam follower, and as shown in FIG. 10, the eccentric cam 73 rotates on the surface of the fixed frame 11 to swing the movable frame 40 with respect to the fixed frame 11. be able to. In this embodiment, since the eccentric cam 73 is attached to the movable unit 40 that rotates integrally with the anvil unit 4 and is housed between the movable unit 40 and the fixed unit 11, the rotation mechanism can be made compact.

FIGS. 9 and 10 show swinging of the anvil unit 4 by the eccentric cam 73. FIG. FIG.
Indicates a state when the anvil unit 4 is on standby, and the movable frame 40 is urged toward the fixed frame 11 by a coil spring 57. FIG. 10 shows a state where the sheet bundle is clamped, and the driving shaft 43 is shown.
When the is rotated, the drive gear 70 is rotated accordingly, and this rotational force is transmitted to the driven gear 72 via the transmission gear 71. The rotation of the driven gear 72 causes the eccentric cam 73 to rotate,
The movable frame 4 using the fixed frame 11 as a cam follower
0 is swung against the spring force of the coil spring 46 and pushed down. The anvil unit 4 is also pushed down together with the movable frame 40, and clamps the sheet bundle at the lower surface thereof. On the other hand, the clincher driving cam 66 rotates together with the rotation of the eccentric cam 73 and pushes the pressing member 67 to swing the clincher section 60, thereby completing the needle bending operation.

The drive shaft 33 of the head unit 3 bridged between the left and right side plates 1a, 1b has one end protruding outside the side plate 1a, and a drive transmission gear 35 is mounted on the protruding end. . Then, a driving force from a driving motor (not shown) is transmitted to the driving shaft 33 via the driving transmission gear 35. In addition, the drive shaft 33
Is projected outside the other side plate 1b, and a transmission gear 75 is attached to the projected end. On the other hand, the drive shaft 43 of the anvil unit 4 also has an end protruding outside the side plate 1b, and a driven gear 76 is attached to the protruding end. An endless gear belt 77 is stretched between the transmission gear 75 and the driven gear 76 to rotate the drive shaft 33 of the head unit 3 via the gear belt 77 to drive the drive shaft 4 of the anvil unit 4.
3 can be transmitted.

Next, the stapling operation of the stapler S having the above configuration will be described. Between the head unit 3 and the anvil unit 4, a flat sheet guide plate 78 laid over the left and right side plates 1 a and 1 b is provided, and on both sides of the anvil unit 4, the guide shaft 10, the drive shaft 43 and A rod-shaped path guide member 79 is bridged between the two. The path guide member 79 is disposed so as to face the sheet guide plate 78, and has a thin coil spring 80 whose tip is wound around the guide shaft 10.
And the rear end is loosely fitted to the drive shaft 43, so that the anvil unit 4 can move as it slides along the guide shaft 10. The sheet conveyed between the head unit 3 and the anvil unit 4 includes the sheet guide plate 78 and the path guide member 79.
The sheets are stacked at a predetermined position while being guided by the sheet to form a sheet bundle. By driving the motor 16 based on the control signal, the screw rods 14 and 15 rotate, and guide the head unit 3 and the anvil unit 4 to predetermined positions. At this time, the head unit 3 and the anvil unit 4 move together in the same direction synchronously and stop at the same position. next,
As the drive shafts 33 and 43 rotate, the head unit 3 and the anvil unit 4 swing synchronously. At this time, on the head unit 3 side, only the head 25 swings toward the anvil unit 4 due to the movement of the arm portion 29 having the cam hole 31, and the head housing 24 does not swing and remains as it is. On the other hand, on the anvil unit 4 side, the movable frame 40 swings due to the rotation of the eccentric cam 73, and the staple is driven into the sheet bundle by clamping the sheet bundle with the head 25. In addition, the clincher driving cam 66 rotates together with the eccentric cam 73, and the clincher unit 60 is operated to bend the tip of the staple penetrating the sheet bundle inward and saddle-stitch the sheet bundle. At that time, as described above, the anvil unit 4 swings according to the thickness of the sheet bundle, and the needle is bent at an appropriate anvil position. When the cam rotates once and the head 25 and the anvil unit 4 return to their original positions, the rotation of the drive shafts 33 and 43 stops, and the screw rods 14 and 15 rotate again to seat the head unit 3 and the anvil unit 4 on the sheet. It is moved to a predetermined position in the width direction and saddle stitching is performed in the same manner as described above.

In the present invention, the swinging mechanism of the movable frame 40 is not limited to the eccentric cam 73 of the above-described embodiment. For example, the swinging mechanism can be swung by the mechanism used for swinging the head 25. . In the above embodiment, the case where the sheet bundle is clamped between the head unit 3 at a predetermined position by swinging the anvil unit 4 side has been described. However, it is possible to swing the head unit 3 side. It goes without saying that the head unit 3 and the anvil unit 4 can swing relative to each other.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an overall configuration of a stapler according to the present invention.

FIG. 2 is a configuration diagram of a head unit and an anvil unit arranged to face the unit.

FIG. 3 is an exploded perspective view showing a configuration of an anvil unit.

FIG. 4 is a perspective view showing a structure of a rotation center portion of the anvil unit.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a perspective view showing a swing mechanism of a clincher unit.

FIG. 7 is a side view of an anvil unit showing a height position of an anvil main body with respect to a movable frame when a thin sheet bundle is clamped.

FIG. 8 is a side view of an anvil unit showing a height position of an anvil main body with respect to a movable frame when a thick sheet bundle is clamped.

FIG. 9 is a side view showing a posture of the anvil unit before swinging.

FIG. 10 is a side view illustrating a posture when the anvil unit swings and clamps a sheet bundle.

FIG. 11 is a side view of the stapler showing a driving force transmission unit of the driving shaft.

[Explanation of symbols]

 Reference Signs List 3 head unit (needle driving unit) 4 anvil unit (bending unit) 7 housing frame (base frame) 11 fixed frame (base frame) 33, 43 drive shaft 16 motor 40 movable frame 73 eccentric cam

Continuing on the front page (72) Inventor Toshiro Fukasawa 430-1, Kobayashi, Masuho-cho, Minamikoma-gun, Yamanashi Prefecture Inside Niska Corporation (72) Inventor Koichi Tachibana 430-1, Kobayashi, Masuho-machi, Minamikoma-gun, Yamanashi Nisuka Corporation F Term (reference) 3C054 CB01 CC01 CD05 CE05

Claims (6)

[Claims] 1. A staple driving unit for driving a staple into a sheet bundle, a bending unit disposed opposite to the staple driving unit and bending both ends of the staples driven into the sheet bundle, and a clamp unit for clamping the sheet bundle. A stapler having a swingable movable frame for holding at least one of the stapling unit and the bending unit, a base frame for swingably supporting the movable frame, and a driving rotator provided on the movable frame. A stapler wherein one is engaged with a cam and the other is engaged with a cam follower. 2. The stapler according to claim 1, wherein the base frame is slidably mounted in a sheet bundle width direction on a drive shaft provided on an apparatus frame. 3. The center of rotation of a movable frame swingably supported by the drive shaft and the base frame so that the movable frame swings about the drive shaft. The stapler described. 4. The drive shaft is rotatably supported on the machine frame, and the drive shaft is connected to a drive motor mounted on the machine frame, and the rotation of the drive shaft is transmitted to the drive rotating body. The stapler according to claim 3, wherein: 5. An apparatus frame, at least two base frames slidably mounted on the apparatus frame in a sheet width direction, the stapling unit on one of the base frames, and the bending unit on the other. The stapler according to claim 1, wherein each of the staplers is attached. 6. The stapler according to claim 5, wherein the two base frames are moved in the sheet width direction in synchronization with a single drive motor attached to the apparatus frame.