JPH07308891A - Cutter device - Google Patents

Abstract

PURPOSE:To prevent paper jam occurrence that is due to a record paper transport tip side being hindered by the surfaces of edge bodies, when a rolllike record paper sheet at a facsimile device is transported toward a cutter device. CONSTITUTION:Both edge tips of a receiving edge body 24 and a turning edge body 25 cross the transport route of a record paper sheet 14 and extend, and the movable edge body 25 is incliningly arranged, in regard to the receiving edge body 24, so that a paper passage opening may become small on a cutting off start side and the paper passage opening may become large on a cutting off finish side, and a pair of upper and lower guide bodies 40, 41 to guide the wide width surface of the record paper sheet 14 are arranged on a paper feed side facing a cutter device. Meanwhile, the movable edge body 25 is constitute so that it may be turned in a direction that approaches the guide bodies 40, 41 at the time of paper cutting off, and an auxiliary guide slab 43 made of synthetic resin having flexibility is provided at a horizontal piece 40a at the upper guide body 40 so as to extend in the turning edge body 25 direction. The posture of the record paper sheet 14 is regulated by means of the auxiliary guide slab 43, and the record paper sheet 14 can be surely passed through an opening between both edge tips of the receiving edge body 24 and the movable edge body 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a facsimile machine or a copying machine, in which an image is formed while pulling out a continuous recording sheet such as a roll, and then the sheet is appropriately cut to a predetermined length. More specifically, the present invention relates to a structure of a cutter device that does not cause a paper jam.

[0002]

2. Description of the Related Art Conventionally, as a cutter device for cutting a continuous sheet of this kind in a direction orthogonal to its conveying direction, Japanese Utility Model Laid-Open No. 6-698 proposed by the applicant of the present invention has been proposed. As disclosed and shown in FIG. 9, with respect to the longitudinal blade edge of the receiving blade body 100, the blade edge of the rotary blade body 101 extends from one side (cutting start side) 101a to the other side (cutting end side) 101 thereof.
A pinching type cutter device is known which is configured so as to sequentially approach and shear toward b.

In this type of cutter device, in order to cut the cutting line of the sheet of paper 102 during conveyance and movement so as to be orthogonal to the side edge of the sheet of paper (102), the sheet of paper 102 is cut from one side in the width direction. In order to disconnect in order toward the other side,
In contrast to the shearing point between the receiving blade body 100 and the movable blade body 101 on the cutting start side (the one side portion) of the sheet 102, the shearing point on the cutting end side (the other side portion) is the paper feeding side ( 9A and 9B so that the receiving blade body 100 and the movable blade body 101 are inclined so that the receiving blade body 100 and the movable blade body 101 are tilted so that the receiving blade body 100 is centered on the rotation fulcrum 103. Rotating in the direction of arrow B, the rotating blade body 101 is the cutting start side pivot 1
It is necessary to rotate in the direction of arrow B around 04a and the fulcrum 104b on the cutting end side. In other words, the paper 102
With respect to the postures of the receiving blade body 100 and the movable blade body 101 at the start of cutting, the receiving blade body 100 and the movable blade body 101 are arranged so that the blade tips of both blade bodies at the end of cutting approach the sheet supply side.
It is necessary to tilt and rotate.

On the other hand, in order to reliably guide and convey the conveyed sheet toward the gap between the receiving blade 100 and the movable blade 101, the wide surface of the sheet is guided to the upstream side (feed side) of conveying the sheet. The pair of guide bodies 105 and 106 is arranged (see FIG. 9A).

[0005]

However, at the end of cutting, as shown in FIG. 9 (b), the receiving blade body 100 and the movable blade body 101 are inclined so that the blade edge side approaches the sheet supply side, so that the guide The bodies 105 and 106 cannot be arranged at positions close to the blade bodies. In particular, the guide bodies 105 and 106 and the movable blade body 101 on the cutting end side
It is necessary to take a large arrangement interval with.

With this construction, the pair of guide members 1
When the leading end portion of the sheet 102 that has passed the portions 05 and 106 is curled, the leading edge of the sheet 102 is more likely to contact the side surface of the receiving blade body 100 or the movable blade body 101, There is a problem that the paper 102 cannot pass through the gap between the blades 100 and 101, and if the paper 102 is conveyed as it is, so-called paper jam occurs.

The present invention has been made to solve this problem, and an object of the present invention is to provide a cutter device having a simple structure and free from paper jam.

[0008]

In order to achieve the above object, the cutter device of the present invention has a receiving blade body and a movable blade body in which the longitudinal axes of the blade edges of the blade bodies intersect with the sheet conveying path. The movable blade is extended with respect to the receiving blade, and is arranged in an inclined shape so that the sheet passage gap is large at one side portion of the longitudinal axes of both blade edges and the sheet passage gap is small at the other side portion. A cutter device, in which a pair of guide bodies for guiding the wide surface of the paper is arranged on the paper supply side of the cutter device, and a support member for supporting the movable blade body is provided for cutting the paper by the movable blade support portion. Sometimes, the guide body is configured to rotate in a direction approaching the guide body, and a flexible auxiliary guide plate is provided on the guide body so as to extend in the movable blade body direction.

[0009]

EXAMPLES Next, examples embodying the present invention will be described. FIG. 1 is a side sectional view of a facsimile device according to the present invention, and FIG. 2 is a front view of a cutter device 21. In the figure, a roll-shaped recording paper 14 such as a thermal paper, which will be described later, is stored on a roll paper tray 15 in a main body case 1 of a facsimile apparatus, and the upper surface thereof is covered with a removable cover body 2. A document tray (not shown) to be transmitted is mounted on a document tray 4 arranged in an inclined shape between the cover body 2 and the front cover 3 with the transmission surface facing downward, and the transmission of the operation panel unit 13 is performed. When a button (not shown) is pressed, the document separating and feeding mechanism near the feeding port separates the sheets one by one. The document sheet sent to the downstream side by the pair of feed rollers 7 and 8 is irradiated with light from the light source 10 in the image reading unit 6, and the reflected light is CCD type through the two mirrors 11a and 11b. Image data is read so as to be input to a read head 12 as an image pickup means such as a solid-state image pickup device,
The image is transmitted via a transmission unit (not shown). The read original sheet is ejected out of the machine through a pair of sheet ejection rollers 9a and 9b.

Further, when receiving the image data, the roll-shaped recording paper 14 on the roll paper tray 15 is pulled out, and the round bar-shaped guide bar 17 in the curl removing mechanism 16 and the curl having a substantially S-shape in side view. An image is formed when the curl-removed recording paper 14 passing between the correction members 18 passes through the platen 19 and the thermal head 20. After that, the recording paper 14 is cut into a predetermined length when passing through a cutter device 21 described later,
And is received by the discharge tray 23.

Next, the structure of the cutter device 21 will be described with reference to FIGS. Cutter device 21
Is a receiving blade body 24 as a fixed blade body in which the blade edge axis extends so as to intersect with the transport movement direction of the recording sheet 14 (direction of arrow A in FIGS. 3 and 4), and the blade edge is upward,
It is composed of a rotary blade body 25 as a movable blade body in which a blade edge is arranged so as to face the receiving blade body 24 downward, and a frame 26 for supporting these blade bodies 24, 25.

As shown in FIG. 5, the lower holder 27 as a supporting member having the receiving blade body 24 attached to one surface (front surface) is formed such that the middle portion in the longitudinal direction is L-shaped in cross section in a side view. The lower holder 27 has pivotal support shaft portions 27a and 27b at the longitudinal ends (both left and right ends) of the frame 26, which are cut out in a substantially eight-shape side view of the frame 26.
8b is fitted from above and is rotatably supported.
One end of the torsion coil spring 29 as an urging means loosely fitted to the one pivot shaft portion 27a abuts on the back surface of the lower holder 27 (the side opposite to the mounting side of the receiving blade body 24), and the torsion coil The other end of the spring 29 is locked to one side of the frame 26 and is configured to urge the receiving blade body 24 toward the movable blade body 25. The retracting rotational position of the upper holder 30 of the rotary blade 25 is restricted by a stopper piece 26a protruding from one side of the frame 26.

The upper holder 30 as a supporting member having the rotary blade 25 attached to one side thereof is also formed with an L-shaped cross-section in the longitudinal midway portion thereof. A long arm 31 is formed by bending one end of the upper holder 30. Rotating shafts 32, 3 at both ends of the upper holder 30
3 is rotatably supported by the left and right side plates 26b and 26c of the frame 26. In this case, the blade edge of the receiving blade 24 and the rotary blade 2 are provided on the rotary shaft 32 side which is the cutting start side.
The gap between the blade edge of No. 5 (upper and lower clearances and paper passage clearance) is smaller, and the clearance between both blade edges (upper and lower clearance and paper passage clearance) at the rotary shaft 33 on the cutting end side is larger. The upper holder 30 is arranged in an inclined shape.

Therefore, assuming that the conveyance path of the recording paper 14 is a horizontal plane, one rotation shaft 32 side is at a low position and the other rotation shaft 33 side is at a high position, as shown in FIG.
Further, the rotary shaft 32 that is the cutting start side is located on the upstream side of the transport with respect to the axis line that is orthogonal to the transport direction of the recording paper 14, and the rotary shaft 33 that is the cutting end side is offset to the downstream side of the transport. (See FIGS. 3 and 7). Similarly,
In the embodiment, the pivot shaft portion 27b, which is the end of the cut end, is set to be slightly deviated to the downstream side of the conveyance with respect to the pivot shaft portion 27a, which is the cutting start side of the lower holder 27 (FIG. 3 and FIG. 3). (See FIG. 7).

The rotating blade body 25 is brought into contact with the anti-bite piece 34 protruding upward from one end of the receiving blade body 24, and the side having a small gap between the blade edge of the receiving blade body 24 (the cutting start side). Thus, the blade edge of the rotary blade body 25 and the bite are prevented from occurring. Further, on the lower surface of the upper holder 30 having an L-shaped cross section,
Although not shown, a protector for preventing foreign matter from being caught is attached to the sheet cutting end side over an appropriate length.

On the arm 31, as shown in FIG.
A long groove 35 is formed along the longitudinal direction, and as shown in FIGS. 2 and 3, an intermittent in the gear mechanism 36 for transmitting power from a drive motor (not shown) to the platen 20 and the cutter device 21. An eccentric pin 38 as a crank pin of a crank arm 37 that rotates via a rotating clutch mechanism 36a is slidably fitted in the slot 35. Then, according to the paper cutting command, the intermittent rotation clutch mechanism 36a is turned on by turning on an electromagnetic solenoid (not shown).
When in the N state, the crank arm 37 is rotated only once, and the rotary blade 25 meshes with the blade 24 and the cutting edge in order from one side (cutting start side) to the other side (cutting end side). It is configured as follows.

Further, as shown in FIGS. 3 and 6, the cutter device 21 has a longitudinal direction along the width direction of the recording paper 14 in order to guide the wide surface of the recording paper 14 to the paper supply side to the cutter device 21. A pair of upper and lower guide bodies 40 and 41 are arranged. The lower guide body 41 in which the middle portion in the longitudinal direction is formed in an inverted L shape and the upper guide body 40 in a substantially L-shaped side cross section have vertical one-side holes formed by bending both ends downward.
It is fitted and supported on a horizontal piece of the one side plate 26c.
As shown in FIG. 2, the other ends of the lower guide body 41 and the upper guide body 40 are placed on a horizontal piece of the other side plate 26b of the frame 26 and fastened by screws 42.

The upper surface of the lower guide body 41 in the longitudinal direction,
A height dimension H by which the recording paper 14 can pass between the horizontal piece 40a of the upper guide body 40 and the lower surface of the midway portion in the longitudinal direction.
A sheet passing gap of No. 1 is formed. Then, as shown in FIGS. 7 and 8, a base end of a flexible auxiliary guide plate 43 is fixed to the upper surface of the horizontal piece 40a of the upper guide body 40 in the longitudinal direction with an adhesive or the like. The free end of the auxiliary guide plate 43 is arranged so as to extend toward the rotary blade body 25. This auxiliary guide plate 43 is arranged along the longitudinal direction of the upper guide body 41 and is eccentrically arranged toward the cutting end side. In the embodiment, the length of the receiving blade body 24 is 235 millimeters above the upper guide body 41. The length dimension L of the auxiliary guide plate 43 along the longitudinal direction of the guide body 40 is set to 110.
In millimeters. Further, in the embodiment, the material of the auxiliary guide plate 43 is preferably a synthetic resin plate such as PET (polyethylene terephthalate), which is curved and deformed by an external force in the direction along the surface of the resin plate and is flat when the external force is removed. It is preferably an elastic body that returns to a linear shape.

Further, as shown in FIG. 4, the inverted L-shaped paper guide lower portion 44 fixed to one surface of the lower holder 27 faces the lower surface side of the horizontal piece of the lower guide body 41 as shown in FIG. When the recording sheet 14 is cut, the upper side of the lower holder 27 (the cutting edge side of the receiving blade body 24) is swung toward the lower guide body 41 at an intermediate portion extending in the longitudinal direction of the lower guide body 41. A hole 45 through which the lower paper guide 44 can pass is formed. With this configuration, even if the leading end of the recording paper 14 that has passed through the paper passage gap between the pair of upper and lower guide bodies 40 and 41 is curled downward, the leading end rides on the upper surface of the lower paper guide 44, The upper and lower blades 24 and 25 are smoothly guided into the gap between the blade edges, and even when the lower holder 27 approaches the lower guide body 41, they do not interfere with each other.

The cutter device 21 configured as described above
According to this, during the recording operation, the receiving blade 24 and the rotary blade 2
As shown in FIG. 2, FIG. 4 and FIG. 8A, 5 is stopped in a state where the paper passage gap on the cutting start side is small and the paper passage gap on the paper cutting end side is large. Note that FIG.
(A) shows the postures of the receiving blade body 24 and the rotary blade body 25 at the start of cutting, point C shows the end of the blade tip of the rotary blade body 25 on the cutting start side, and point D shows the cutting end side. Shows the end of.

The platen 19 is rotationally driven to convey the predetermined amount of the recording paper 14 even after the reception of the predetermined amount of image data and the image formation are completed.
When it becomes a place to be cut, the intermittent rotation clutch 36a is operated by turning on an electromagnetic solenoid (not shown) or the like to rotate the upper holder 30 on the side of the rotary blade 25 in the direction of arrow B in FIGS. As a result, the recording sheet 14 is sheared and cut from the point C, which is one side (cutting start side) of the blade of the rotary blade 25, toward the blade edge of the receiving blade 24 in order. Figure 8
(B) shows the rotation postures of the receiving blade body 24 and the rotating blade body 25 at the end of cutting. As can be understood with reference to FIGS. 8A and 8B, the auxiliary guide plate 43 extending from the horizontal piece 40 a of the upper guide body 40 in the blade tip direction of the rotary blade body 25.
Is straight at the start of cutting, and therefore, the blade bodies 24, 25 pass through the paper passage gaps of the upper and lower guide bodies 40, 41.
The leading end of the recording sheet 14 in the conveying direction facing the direction is guided by the lower surface of the auxiliary guide plate 43 so as to pass through the gap between the blade edges of the two blade bodies 24, 25 even if it is curled to some extent.

When the cutting line for the recording sheet 14 is directed toward the cutting end side, the auxiliary guide plates 43 are rotated when the blades 24 and 25 are tilted so as to approach the pair of guides 40 and 41. Width dimension W (Fig. 8
It is preferable that (a) is set to such an extent that a portion of the tip (free end) of the auxiliary guide plate 43 near the end of cutting is pressed by the surface of the rotary blade 25 and is displaced downward. If the width W of the auxiliary guide plate 43 is made too long, the auxiliary guide plate 43 will be caught between the blade edges and cut when they come into contact with each other at midpoints in the longitudinal direction of the blade edges of the blade bodies 24, 25. Because there is a risk.

Needless to say, the present invention can be applied to a device for cutting continuous paper such as rolled paper in a copying machine or the like.

[0024]

As described above, in the cutter device of the present invention, the receiving blade body and the movable blade body extend with the longitudinal axes of the blade edges of both blade bodies intersecting the sheet conveyance path. A cutter device in which the movable blade body is arranged in an inclined shape with respect to the receiving blade body so that the paper passage gap is large at one side portion of the longitudinal axes of both blade tips and the paper passage gap is small at the other side portion. While a pair of guide bodies for guiding the wide surface of the paper is arranged on the paper supply side of the cutter device, a supporting member for supporting the movable blade body is provided when the movable blade support portion cuts the paper. Since it is configured to rotate in the direction of approaching the guide body, the blade edge of the receiving blade body is sequentially approached from a part (cutting start side) of the blade edge of the rotating blade body in order to load the paper. When cutting by shearing, receiving blade and rotating blade Double-edged destination, to lean movement to approach the guide body, in slicing end side, it is necessary to increase the arrangement interval between the pair of guide members and the rotating blade. Then, there is a case in which the tip of the sheet conveyed through the gap between the pair of guide bodies is curled or the like, so that the sheet cannot pass through the gap between the two blade edges of the receiving blade body and the movable blade body.

Therefore, in the present invention, since the guide body is provided with the flexible auxiliary guide plate so as to extend in the direction of the movable blade body, the posture of the sheet is regulated by the auxiliary guide plate. Thus, it is possible to reliably pass through the gap between the two blade edges of the receiving blade body and the movable blade body. In addition, since the auxiliary guide plate is flexible, even if the auxiliary guide plate comes into contact with or is pressed by the movable blade body that inclines greatly toward the guide body toward the end of the cut end, It bends and deforms due to its flexibility, and when the two blades return to their original positions, the auxiliary guide plate can also return to a straight line due to its own elasticity, so the guide action of the paper deteriorates during repeated cutting operations. It has a remarkable effect of not doing so.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view of a facsimile device.

FIG. 2 is a front view of a cutter device.

FIG. 3 is a plan view of a cutter device.

FIG. 4 is a perspective view of a receiving blade body and a movable blade body.

5 is a view taken along the line VV of FIG.

FIG. 6 is a view taken along line VI-VI of FIG.

FIG. 7 is a plan view showing a state in which an upper guide body is removed.

FIG. 8A is a diagram showing the postures of the receiving blade and the rotary blade at the start of cutting, and FIG. 8B is a diagram showing the postures of the receiving blade and the rotary blade at the end of cutting. is there.

FIG. 9 is a side sectional view showing the structure of a conventional cutter device, in which (a) shows a state at the start of cutting and (b) shows a state at the end of cutting.

[Explanation of symbols]

 21 Cutter Device 24 Receiving Blade 25 Rotating Blade 26 Frame 27 Lower Holder 27a, 27b Pivot Shaft 29 as Supporting Member Twisting Coil Spring 30 as Biasing Means Upper Holder 32, 33 Times as Supporting Member Axis of movement 40 Upper guide body 40a Horizontal piece 41 Lower guide body 43 Auxiliary guide plate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B41J 11/70

Claims (1)

[Claims] 1. A receiving blade body and a movable blade body extend so that the longitudinal axes of the blade edges of both blade bodies intersect with a sheet conveyance path, and the movable blade body is provided with respect to the receiving blade body. In a cutter device that is arranged in an inclined shape so that the paper passage gap is large at one side portion and small at the other side portion, a wide surface of the paper is guided to the paper supply side with respect to the cutter device. A pair of guide bodies are arranged, while a support member for supporting the movable blade body is configured to rotate in a direction in which the movable blade body support portion approaches the guide body when cutting a sheet, A cutter device, wherein a flexible auxiliary guide plate is provided on the body so as to extend toward the movable blade body.