JPH0453694A - Sheet cutting device and recorder using the same cutting device - Google Patents

Abstract

PURPOSE:To prevent a sheet tip from being inserted in the gap even in case of the sheet being curled and to approach the sheet between the fixed edge and rocking edge without its jamming, by fitting a guide member to the support member of the fixed edge and covering the gap between the support member and fixed edge by the guide member. CONSTITUTION:A support member 7d for supporting a fixed edge 7a and rocking edge 7b rocking for the fixed edge 7a are provided. A guide member 7d3 for guiding a sheet between the fixed edge 7a and rocking edge 7b is provided on this support member 7d. The gap caused between the fixed edge 7a and support member 7d is covered by this guide member 7d3. Consequently, the sheet end does not enter this gap even in case the sheet is curled.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a sheet cutting device and a recording device used in facsimile machines, copying machines, etc., and more specifically to a sheet cutting device that can cut sheets without jamming them. The present invention relates to an apparatus and a recording apparatus using the sheet cutting apparatus.

<Prior Art> Today, recording devices such as facsimile machines are widely used, and these devices are designed to accommodate recording lengths of all lengths by winding a long recording sheet onto a core. Generally, a so-called sheet roll is used, and after recording a received image, the image is cut with a cutter from the trailing edge.

Here, the conventional cutter has a fixed blade 50 as shown in FIG.
The swinging blade 51 is configured to be swingable relative to the double-edged blade 50.5.
In many cases, the sheet 52 is cut by rubbing 1 against each other. In recent years, when the fixed blade 50 and the swinging blade 51 are constructed with thick blades, a large amount of steel material is used for the blade movement, which increases the cost. Therefore, as shown in FIG. 6, the fixed blade 50 is constructed with a thin blade. There is one in which this fixed blade 50 is attached to a fixed blade stay 53 made of bent sheet metal.

By doing so, the cost can be reduced by reducing the amount of steel used for the blade, and the rigidity of the thin fixed blade 50 is reinforced by the fixed blade stay 53.

<Problems to be Solved by the Invention> However, in order to increase the rigidity of the thin fixed blade 50, when the thickness of the fixed blade stay 53 is increased, the bending portion R becomes larger as shown in FIG. The radius of curvature increases and a gap α is created between the fixed blade 50 and the stay 53. At this time, if the sheet 52 conveyed between the two blades 50 and 51 is curled upward, the leading edge of the sheet will enter the gap α and jam, as shown by the dashed line in FIG.

In order to prevent the jam, the lower end of the fixed blade 50 is bent at the lower end 53 of the fixed blade stay 53, as shown in FIG. 7(a).
If the recording sheet 52 is installed so as to be positioned above the extension line of a so that the gap does not occur, the recording sheet 52 will come into contact with the bent portion R of the fixed blade stay 53 when cutting the sheet, and the sheet 52 relative to the fixed blade 50 will The approach angle θ is the seventh
As shown in E(b), the fixed blade 50 is larger than when it does not contact the bent portion R of the frame 53, and the fixed blade 50 may be pushed upward by the tension of the recording sheet 52, resulting in poor cutting.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, and to provide a sheet cutting device and a sheet cutting device capable of reliably cutting sheets without causing jams even when cutting costs are reduced by using thin cutting blades. The present invention aims to provide a recording device using a cutting device.

<Means for Solving the Problems> A typical means according to the present invention for solving the above problems includes a fixed blade made of a thin blade, a support member for supporting the fixed blade, and a support member for supporting the fixed blade. and a guide member attached to the supporting member to guide the sheet between the fixed blade and the swinging blade, the guide member being formed between the fixed blade and the supporting member. The sheet cutting device is characterized in that the sheet cutting device is configured to cover the gap.

Further, the present invention is characterized in that a recording device is configured using the sheet cutting device.

<Operation> In the above means, the guide member is attached to cover the gap between the support member and the fixed blade, and even if the sheet is curled, the leading edge of the sheet will not enter the gap. Therefore, the fixed blade enters between the swinging blades without jamming the sheet, and the sheet is reliably cut.

<Embodiment> Next, an embodiment of the present invention in which the above means is applied to a facsimile machine will be described.

FIGS. 1(a) and 1(b) are configuration explanatory diagrams of a sheet cutting device;
FIG. 2 is an explanatory diagram of the internal configuration of a recording apparatus using the sheet cutting device.

(Overall Configuration) First, the overall configuration of the facsimile apparatus according to this embodiment will be described.

As shown in FIG. 2, this is configured such that a plurality of originals 2 placed on an original placing table 1 are separated and transported one by one by an original conveying means 3, and are read by a reading means 4.

The information read by the reading means 4 is transmitted to its own recording means 5 when in the copy mode, and transmitted to the recording means of another machine when in the transmission mode.

Then, recording is performed on the recording sheet 6 according to the information, and the sheet 6 after recording is canted by a cutter 7, which is a sheet cutting device, and is discharged to a discharge stacker 8C by a pair of discharge rollers 8a and 8b, which is a discharge means 8. It consists of

Next, the configuration of each part will be specifically explained.

(Original conveying means) As shown in FIG. 2, this is used to transport a plurality of originals 2 placed on the original placing table 1 to a preliminary conveying roller 3a, a pressing piece 3b that presses against this, and further a separation roller 30 and this. The sheets are separated and fed one by one by the pressure contact piece 3d that comes into pressure contact with the conveyor roller pairs 3e+, 3e2 and the discharge roller pair 3fl.
, 3(z) and is configured to be transported in the direction of arrow a and discharged onto the discharge tray 3g.

(Reading means) The reading means 4 reads written information on the document conveyed by the document conveyance means 3 and converts it into an electric signal, and as shown in FIG. ,, afz)
4a is provided, and light from a light source 4b is irradiated onto the document surface from the sulin 4a, and the reflected light is reflected by a plurality of mirrors 4C, passes through a lens 4d, and enters a photoelectric conversion element 4e such as a CCD. As a result, it is configured to convert read information into electrical signals.

(Recording Means) The recording means 5 in this embodiment uses a heat-sensitive recording method, and as shown in FIG. A sheet roll 6b wound around the sheet roll 6b is housed in a roll holder 9, and the recording sheet 6 is set so as to reach the recording means 5.

The recording means 5 is configured such that a platen roller 5a, which also serves as a means for sorting and conveying recording sheets 6, is driven and rotated by a platen motor (not shown).
The recording head 5b is pressed into contact with the recording head by the pressure of the pressing spring 5C. The recording head 5b is formed by arranging minute electrothermal transducers that generate heat when energized in a line in the width direction of the recording sheet 6, and conveys the recording sheet 6 by rotating the platen roller 5a in the direction of the arrow in FIG. At the same time, the recording sheet 6 is configured to record on the recording sheet 6 by energizing the electrothermal transducer according to the read information.

(Sheet Cutting Device W) A cutter 7, which is a sheet cutting device, cuts the sheet 6 recorded by the recording means 5 from the trailing edge of the image.

As shown in FIGS. 1 and 2, the structure consists of a fixed blade 7a made of a thin blade, and a swinging blade 7b that is swung by a motor (not shown) and can rub against the fixed blade 7a. It is configured as a dynamic cutter.

To explain this specifically, in FIGS. 1(a) and (g), 7c is a cutter chassis having upright side plates 7c and 7cz at both ends, and is fixed to the main body of the recording apparatus. A fixed blade stay 7d and a swinging blade 7b, which serve as supporting members for the blade 7a, are rotatably pivoted.

The fixed blade 7a in this embodiment is composed of a thin blade with a thickness of about 0.8 mm, and this is the fixed blade stay 7 that is bent into a crank shape.
d, and both ends of this fixed blade stay 7d are attached to the shaft 7
Side plate 7c of cutter chassis 7c by d+, 7dg
It is rotatably attached to the 7cz. Further, a torsion coil spring 7e is attached to the shaft 7d, one end of the spring 7e is locked to the side plate 7cx, and the other end is locked to the back side of the fixed blade stay 7d, so that the fixed blade 7a can be oscillated. 7b is always energized. Furthermore, a guide protrusion 7a+ is provided at one end of the fixed blade 7a to restrict the biasing of the fixed blade 7a and to guide the rubbing with the swinging blade 7b.

The swinging blade 7b is constituted by a thick blade about 5 mm thick, and both ends of the swinging blade 7b are rotatably attached to the chassis side plate 7c + + 7ct by shafts 7b+ and 7bz. A pin 7b4 is protruded from one end of the swinging blade 7b closer to the cutting edge Tbs than the shaft 7b+, and a link (not shown) is pivotally connected to the pin 7b, and the link is connected to an eccentric cam. It is connected to a motor connected to. Therefore, by driving the motor, the swinging blade 7b
swings around the shafts 7b, 7b, and as a result, the cutting edge 7b3 of the swinging blade 7b and the cutting edge 7a of the fixed blade 7a move from the end p on the rubbing start side toward the end q on the rubbing end side. The recording sheet 6 is cut by sequential rubbing. Incidentally, after cutting the sheet, the swinging blade 7b returns to the standby position by the link mechanism.

In order to ensure that the swinging blade 7b rubs against the fixed blade 7a, the shaft 7d+ of the fixed blade stay 7d,
7d is attached at almost the same position in the X-Y coordinates of the first rotation), and while the fixed blade 7a is attached approximately perpendicular to the conveying direction of the sheet 6, the pivoting blade 7b is is the shaft 7b on the rubbing start side p.

The shaft 7bi on the rubbing end side q moves in the X direction based on .

It is installed biased toward the upstream side in the sheet conveyance direction and biased downward by y1 in the Y direction. As a result, the fixed blade 7a is installed so that the cutting edge 1at intersects the circumference of the cutting edge trajectory circle 7f of the swinging blade 7b, and the cutting edge 7az of the fixed blade 7a reliably interferes with the cutting edge trajectory circle 7f.

Here, the relationship between the fixed blade 7a and the fixed blade stay 7d will be explained.

The fixed blade stay 7d is made of a sheet metal with a thickness of about 2wl1 bent into a crank shape to increase its rigidity, and as shown in FIGS. 1 and 3, the lower part of the stay 7d is bent upstream in the sheet conveyance direction. A guide portion 7ds is formed, and the upper portion is bent downstream in the sheet conveyance direction to form a lever portion 7d4. Then, the fixed blade 7a is attached to the upright part 7d that connects the guide part 7d and the lever part 7d4, and at this time, as shown in FIG. 3, the lower end where the cutting edge 7az of the fixed blade 7a is formed is , is attached so as to be located on the lower surface extension line of the guide portion 7ds.

The fixed blade stay 7d has a constant thickness in order to maintain a certain degree of rigidity, and as shown in FIG. 3, the bent portion R between the guide portion 7aa and the upright portion 1a5 is bent in a curved shape with a predetermined curvature. are doing. Therefore, a gap α is created between the fixed blade 7a and the stay 7d at the bent portion R. Therefore, in this embodiment, in order to cover the gap α,
A sheet guide member 7g made of a thin polyester plate with a thickness of approximately 0.1 m is attached to the lower surface of the guide portion 7d3.

One end of the guide member 7g on the upstream side in the sheet conveyance direction projects further upstream than the guide portion 7ds of the stay 7d, and the other end on the downstream side in the sheet conveyance direction contacts the lower end of the fixed blade 7a. It is attached so that it does not touch 7az. Therefore, the swinging blade 7b relative to the fixed blade 7a
It does not interfere with the friction between the blades 7a and 76, and completely covers the gap α formed between the fixed blade 7a and the stay 76, as shown in FIG. The thickness of the guide member 7g is set to such a value that it does not come into contact with the swinging blade 7b and change the sheet entry angle during sheet cutting.

As a result, even if the recording sheet 6 that has passed through the recording means 5 is curled upward, the guide member 7
The fixed blade 7a and the swinging blade 7b are guided by the fixed blade 7a and the stay 7d without entering the gap α formed by the fixed blade 7a and the stay 7d.
It will be inserted in between. When cutting, the cutting edge 7a of the fixed blade 7a is located at the extension line of the lower end surface of the stay 7d, so that the recording sheet 6 is reliably cut.

Next, the lever part 7d4 will be explained. This is for the purpose of removing the jammed sheet 6 by pushing the lever part 76a downward with a finger or the like to rotate the fixed blade 7a if the recording sheet 6 jams in the cutter 7 portion. As shown in FIG. 1(a), the lever part 7d4 in this embodiment has a sheet conveyance downstream end that is connected to the discharge roller 8.
It is configured to protrude so as to reach the vicinity of a.

As described above, the swinging blade 7b is attached at a position where the rotating shafts 7b, 7bt are shifted from each other in the x-y coordinates in order to ensure the rubbing with the fixed blade 7a. Therefore, the gap β between the downstream end of the swinging blade 7b in the sheet conveyance direction and the discharge roller 8b differs between the rubbing start side p and the rubbing end side q by the amount of the deviation. In this embodiment, the width of the roller portion 8b+ of the discharge roller 8b is narrower than that of the swinging blade 7b, and the downstream end of the swinging blade 7b in the sheet conveyance direction and the discharge roller 8b
Let β be the gap between the roller shaft 8b and the roller shaft 8b, as shown in Fig. 4(a).
As shown in , the gap β is approximately 5 on the rubbing start side P.
On the other hand, as shown in Figure 4, etc., on the rubbing end side q, the gap β is approximately 9 m+. Therefore, the end of the lever part 7b on the rubbing end side q is extended toward the discharge roller 8a, and as shown in FIG. 4(b), the lever part 7b on the rubbing end side q, and discharge roller 8a
The structure is such that the gap γ between the two is narrowed. Here, the gap T is 2 mm to 8 m, preferably 2 m to 5I111+
It is most preferable to set the distance to 2 m to 3 m, and in this embodiment, it is set to about 4 m.

Therefore, on the rubbing end side q, the lever part 7da comes to cover the gap β between the swinging blade 7b and the discharge roller shaft 8bz, and it is difficult to insert a finger or the like between the lever part 1da and the discharge roller 8a. As a result, even if the gap β between the swinging blade 7b and the discharge roller shaft 8b on the rubbing end side q is set wide, there is a risk that a finger or the like may get stuck in the gap β. It is something that will disappear. Note that even on the rubbing start side p, the lever part 7da may be extended toward the discharge roller 8a side, but as shown in FIG. 4(a), the gap between the lever part 7d and the discharge roller 8a Even if T is wide, the gap β between the swinging blade 7b and the discharge roller shaft 8bz is narrow, so there is no risk of a finger or the like getting stuck in the gap β.

By partially extending the lever portion 7d of the fixed blade stay 7d toward the discharge roller as described above, it becomes easier to clear a jam near the cutter 7, for example.

[Other Examples]

In the embodiment described above, an example was shown in which the fixed blade 7a of the sheet cutting device was constructed with a thin blade, and the swinging blade 7b was constructed with a thick blade.
The swinging blade 7b may be attached to a swinging blade stay, and both the fixed blade 7a and the swinging blade 7b may be made of thin blades.

Furthermore, in the embodiment described above, the fixed blade 7a is different from the swinging blade 7b.
Although the swinging blade 7b is arranged above the fixed blade 7a, it goes without saying that the swinging blade 7b may be arranged above the fixed blade 7a.

Further, in the above-mentioned embodiment, the lever part 7da was designed to protrude to the vicinity of the ejection roller 8a only on the rubbing end side q where the gap β between the swinging blade 7b and the ejecting roller is wide. The lever 7d may be configured to protrude not only on the side q but also on the rubbing start side p to the vicinity of the discharge roller 8a.

Furthermore, the materials, dimensions, etc. exemplified in the sheet cutting device described above are not limited to these, and can be changed as appropriate.

Furthermore, in the above embodiment, the width of the roller portion 8b+ of the discharge roller 8b is narrower than the width of the swinging blade 7b.
It goes without saying that similar effects can be obtained even when the width of the roller portion 8b is the same or wider.

Further, in the above-mentioned embodiments, a thermal recording method was used as a recording means, but the recording means is not limited to this, and there are other methods for recording sheets such as a thermal transfer recording method, an inkjet recording method, an impact recording method, etc. It is possible to use various recording methods for recording.

Further, regarding the conveyance means for the recording sheet 6, in the above-described embodiment, the recording sheet 6 is conveyed by the platen roller 5a constituting the recording means 5, but a sheet conveyance roller separate from the recording means 5 is provided, and the recording sheet 6 is thereby conveyed. The sheet 6 may be conveyed, and furthermore, the recording sheet 6 may be conveyed by rotating an endless belt instead of a roller.

Furthermore, the sheet cutting device and the recording device can of course be used in, for example, a printer, a copying machine, etc., in addition to the above-mentioned facsimile machine.

<Effects of the Invention> As described above, the present invention provides a sheet cutting device including a fixed blade and a swinging blade, in which a guide member is attached to the support member of the fixed blade, and the guide member is connected to the support member and the fixed blade. Since the gap is covered, even if the sheet is curled, the leading edge of the sheet is prevented from entering the gap, and the sheet can be inserted between the fixed blade and the swinging blade without jamming. Therefore, even if the cutting blade is made thinner in order to reduce costs, the sheet can be cut accurately, and a recording device using this sheet cutting device can prevent jams that occur at the sheet cutting portion during recording. This allows for smooth recording.

[Brief explanation of the drawing]

1(a) and (c) are diagrams illustrating the configuration of a sheet cutting device according to an embodiment of the present invention, FIG. 2 is a diagram illustrating the internal configuration of a recording device using the sheet cutting device, and FIG. 4(a) and 4(b) are explanatory diagrams of the main parts of the sheet cutting device, and sectional explanatory diagrams of the rubbing start side and the rubbing end side of the fixed blade and the swinging blade, and FIGS. 5 to 7(a) are ) and (b) are explanatory diagrams of the prior art. 1 is a document placement table, 2 is a document, 3 is a document conveyance means, 3a is a preliminary conveyance roller, 3b is a pressure contact piece, 3C is a separation roller, 3
d is a pressure contact piece, 3e1 and 3e2 are conveyance rollers, 3 f+,
3 fz is a discharge roller, 3g is a discharge tray, 4 is a reading means, 4a is a slit, 4b is a light source, 4C is a mirror,
4d is a lens, 4e is a light converting element, 5 is a recording means, 5
a is a platen roller, 5b is a recording head, 5C is a pressing spring, 6 is a recording sheet, 6a is a winding core, 6b is a sheet roll, 7 is a cutter, 7a is a fixed blade, 7a+ is a guide protrusion, 7az is a cutting edge, 7b is Swinging blade, 7b+, 7bz are shafts, 7b is cutting edge, 7b is bin, 7c is cutter chassis, 7c+7cz is upright side wall, 7d is fixed blade stay,
7d, 7d2 is the shaft, 7ds is the guide part, 7d is part of the lever, 7d. 7e is a torsion coil spring, 7f is a cutting edge locus circle, 7g is a sheet guide member, 8 is a discharge means, 8a, ab
is the discharge roller, 8b is the roller part, 8bz is the roller shaft,
8c is a discharge stacker, and 9 is a roll holder.

Claims (2)

[Claims] (1) A fixed blade made of a thin blade, a support member for supporting the fixed blade, a swinging blade that swings with respect to the fixed blade, and a swinging blade that is attached to the support member and swings the sheet with the fixed blade. What is claimed is: 1. A sheet cutting device comprising: a guide member for guiding between movable blades, the guide member being configured to cover a gap created between a fixed blade and a support member. (2) A sheet conveying means for conveying a sheet, a recording means for recording on the sheet conveyed by the sheet conveying means, and a claim for cutting the sheet recorded by the recording means ( 1) A recording device comprising the sheet cutting device described above.