JPS62271770A - Paper-cutting mechanism in printer - Google Patents

Abstract

PURPOSE:To securely make a cut in a rolled paper and enable easy cutting of the paper, by providing a pressing member for pressing a guide wall for the rolled paper and causing the pressing member to press the rolled paper when cutting the paper. CONSTITUTION:With a cutting command outputted from a controlling circuit, a motor 5 is rotated, a driving force thereof is transmitted to a feed screw 3, and the movement a carrier 2 is started. A pressing member 6 is started for moving with the movement of the carrier 2, and when the member 6 reaches a position on a rolled paper 10, the paper is pressed against a paper guide 11, 12 by an elastic force of the member 6. With a further movement, an edge 7a of a cutter 7 comes into contact with the paper 10. Since the paper 10 is pressed against the paper guide 11, 12 by the member 6, the stiffness of the paper in a paper-cutting direction in the vicinity of the point of contact can be enhanced, and a cut can be easily made in the paper without bending the paper, even where the edge of the cutter 7 is not so sharp. When the cutting of the paper 10 proceeds to completion, the motor 5 is reversely rotated to return the carrier 2, whereby a cutting operation is finished.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a cutting mechanism for wire recording paper (roll paper) used in thermal transfer recording devices, etc. Concerning a reliable cutter mechanism for cutting roll paper.

[Conventional technology]

A roll paper cutting mechanism used in a conventional thermal transfer type recording device will be explained with reference to FIGS. 8 to 10.

FIG. 8 is a perspective view of a rotary cutter that is currently widely used in facsimiles. Between play) 1.1', a semi-cylindrical rotary blade 19 is rotatably supported, and a flat fixed blade 18 is also attached so as to be able to come into contact with the cutting edge 19α of the rotary blade 19. At one axial end of the rotary blade 19, a shaft 19'b protrudes from the plate 1 in order to obtain rotational driving force. Furthermore, the roll paper 10' is moved between the rotary blade 19 and the fixed blade 1.
A guide member 20.21 for guiding to the gap between the
They are fixed between the fixed blade 1B and the blade 1.1, respectively.

The roll paper 10 is conveyed in the direction of arrow A by a roller (not shown), enters the gap between the rotary blade 19 and the fixed blade 18 by the guide member 20.21, is further fed to the cutting position of the roll paper 10, and stops. Next, when a roll cutting command is issued from a control circuit (not shown), a motor (not shown) that transmits rotational driving force to the shaft 19b rotates, and the rotary blade 19 is moved by arrow B.
By rotating once in the direction, the cutting edge 19 of the rotary blade 19
α comes into contact with the fixed blade 18 and cuts the roll paper 10. Such a rotary cutter has a rotary blade 19 with a tip 19α.
Since the blade comes into contact with the fixed blade 18, there is a risk of wear and chipping of the blade edge 19α, so the blade edge 19α must be made of special material, heat treated, etc. are giving. As a result, although the reliability of cutting the recording paper and the cut surface are excellent, there is a problem in that the cost is very high.

Next, a cutting mechanism for cutting roll paper without using such a rotary cutter will be explained with reference to FIGS. 9 and 10. The carrier 2 to which the cutter 7 for cutting the roll paper 10 is attached is configured to fit with a feed screw 3 and a guide shaft 4 for reciprocating the carrier 2. When the roll paper 10 is transported by transport rollers and paper guides (not shown) and stops at the position where the roll paper 10 is to be cut, the feed screw 3 is rotated by a driving force (not shown), and the carrier 2 By moving the cutter 7 in the axial direction, the cutter 7 cuts the roll paper 10i. At this time, tension is applied to the roll paper 10 in the directions of arrows C and D, respectively. In such a cutting mechanism, if the cutting edge of the cutter 7 loses its sharpness due to wear or the like, or if the tension applied to the roll paper 10 during cutting is too low, the roll paper 10 will be cut when the roll paper 10 starts to be cut, as shown in FIG. 10 was bent, resulting in poor cutting.

Incidentally, related devices of this type include, for example, Utility Model Publications 1984-4767 and 1982-25878.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology has problems in terms of reliability in cutting such as sharpness and wear of the blade, but is very high in cost and difficult to miniaturize. The latter is the opposite of the former, and is low cost and compact, but it does not take into account the reduction in the tension of the roll paper and the sharpness of the cutter blade when cutting the roll paper, and the roll paper is not cut into the roll paper. There was a problem in that the roll paper had to be folded and stowed in order to prevent it from entering.The purpose of the invention is to solve the above problems and provide a paper cutting mechanism that is inexpensive and has high cutting reliability. .

[Means for solving problems]

The above purpose is to provide the roll paper supply side and the discharge side, which are the front and rear of the moving part, excluding the part where a flat-blade cutter provided on a carrier that reciprocates along the platen when cutting the roll paper moves. Achieved by providing a roll paper guide wall provided on either side and a pressing member that can press the roll paper against the guide wall near the cutter, and the pressing member pressing the roll paper when cutting the roll paper. be done.

[Effect]

The cutting section of the roll paper is the roll paper provided on the roll paper supply side and/or the roll paper discharge side, which are the front and back of the moving part, excluding the part where the flat-blade cutter provided on the carrier moves. A pressing member that suppresses the paper guide wall presses the rolled paper in the vicinity of the cutter.

This is done by pressing and moving the carrier. As a result, even if the tension of the roll paper and the sharpness of the cutter decrease during cutting, the phenomenon of bending the roll paper because the roll paper is not cut will not occur when the pressing member Since this is prevented by pressing the roll paper against the guide wall, cuts can be easily made in the roll paper, thereby eliminating cutting defects when cutting the roll paper.

[Example] An example of the present invention will be described below with reference to FIGS. 1 to 7. FIG. 1 is a schematic front view of a cutting W mechanism as an embodiment of the present invention, FIG. 2 is a front view of a portion of the same cutter, and FIG. 3 is a side view of FIG. 2.

Between play) 1.1', a carrier 2 that reciprocates between play) 1.1' and a feed screw 3 for moving the carrier 2 that fits into the carrier 2 are rotatably fixed,
Also 'F+') Guide shaft 4 for linear movement of actuator 2
is also fixed. One end of the feed screw 3 in one axial direction is attached to a motor 5 fixed to the plate 1 so as to be able to transmit rotation thereto in order to obtain rotational driving force. FIG. 4 shows a pressing member 6 made of a leaf spring-like member attached to the carrier 2.
The pressing member 6 has holes 6a and 5b for attaching it to the carrier 2.
Further, near the center, there is also provided an elongated hole 6C through which the cutter 7 for cutting the roll paper 10 is inserted. Bins 8 and 9yE:: are inserted into holes 6α and 6b provided in the pressing member 6 for attachment to the carrier 2, and the pressing member 6 except for the portion where the cutter 7 moves is the roll that hits the front and rear of the moving portion. Penose guide 1 is a guide wall that guides the roll paper 10 provided on the paper supply side and discharge side.
1.12 to form a shape close to a U-shape so as to press the top, and insert a pin 8.9 into the carrier 2 so as to insert it into the elongated hole 6C of the cutter No. 7 pressing member 6 fixed to the carrier 2. Install. In addition, in order to prevent the cutter 7 from wobbling, the cutting edge of the cutter 7 is connected to the fixing piece 13 and the cutter pressure bar 1.
4 and a pressure contact spring 15, the cutter 7 is finally brought into pressure contact.

Furthermore, 16.17 is a conveyance roller that conveys the roll paper, and is rotatably supported between the plates 1 and 1'.
Next, the roll paper 10 transported by the transport rollers 16 and 17, which will explain the roll paper cutting operation, is guided by the paper guides 11, 12, and is sent to the position where the roll paper 10 is cut, and then stopped. FIG. 1 shows the positional relationship between the cutter 7 and the roll paper 10 in this state. As shown in FIG. 1, the cutter 7 and the pressing member 6 are waiting at a position where the conveyance of the roll paper 10 cannot be prevented. Next, when a cutting command is issued from a control circuit (not shown), the motor 5
rotates and transmits its driving force to the feed screw 3, whereby the carrier 2 starts moving. As a result, the pressing member 6 first starts moving along with the movement of the carrier 2,
When the pressing member 6 reaches the top of the roll paper 10, the roll paper 10 is pressed against the paper guide 11, 12 by the elastic force of the pressing member 6, and as it continues to move roughly, the blade surface 7α of the cutter 7
contacts the roll paper 10. This state is shown in FIGS. 5 and 6. FIG. 6 is a plan view showing the positional relationship among the pressing member 6, the cutter 7, and the roll paper 10. Near the contact point -A between the cutter 7 and the roll paper 10, as shown in FIG.
Since it is pressed against the contact point A, the rigidity of the paper in the paper cutting direction near the contact point A can be increased. Therefore, cutter 7
Even if the cutting edge is not very sharp, can it easily cut into the roll paper without bending the paper twice? You can put it in.

In FIG. 7, the carrier 2 is further moved from the state in FIG. 5,
Indicates the state in which disconnection has started. When the cutting progresses further and the cutting of the roll paper 10 is completed, the motor 5 rotates in the reverse direction to return the carrier 2 to the state shown in FIG. 1, thereby completing the cutting operation. Here, confirmation of the completion of cutting of the roll paper 10 and return amount of the carrier 2 can be easily performed by detecting the rotational speed of the motor 5.

In the embodiment described above, the pressing member 6 is fixed to the carrier 2 and moved in conjunction with the movement of the carrier 2. However, the pressing member 6 is not interlocked with the carrier 2, and the pressing member 6 is moved only in the vicinity of the roll paper cutting start point. 6 is configured to press the roll paper 10, or roll paper cutting +lIl! It is also possible to have a configuration in which the entire width is pressed at the same time.

- [Effects of the Invention] According to the present invention, except for the movable part of the flat blade-shaped cutter provided on the carrier, the roll paper supply side and/or the discharge side, which are the front and rear of the moving part, A pressing member is provided to press the roll paper guide wall provided on the roll paper, and when the roll paper is cut, the pressing member presses the roll paper, resulting in a decrease in the tension of the roll paper during cutting and a decrease in the sharpness of the cutter blade surface. In order to be able to reliably cut the roll paper and cut it easily without making a cut in the roll paper at the start of cutting and without causing cutting defects such as bending the roll paper, special materials and heat treatment are required. This has the effect of providing a paper cutting mechanism with high cutting reliability using an inexpensive cutter without using an expensive cutter.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of one embodiment of the present invention, and FIG. 2 is a schematic front view of one embodiment of the present invention.
3 is a side view of FIG. 2, FIG. 4 is an explanatory diagram of parts of the pressing member, and FIG. 5 is a schematic front view showing state 2 in which the cutter is in contact with the roll paper. 6 is a front view showing the contact point between the cutter and the roll paper in FIG. 5, FIG. 8 is a perspective view of the rotary cutter, FIG. 9 is a schematic perspective view of a cutting mechanism according to the prior art, and FIG. FIG. 2 is an explanatory diagram showing problems in the case of conventional technology. 1.1... Plate 2... Carrier 3... Feed screw 4... Guide shaft 5... Motor 6... Pressing member 7... Cutter 10... Roll paper 11.12. ... Paper guide 2 Center rear 5 T-Me 10 Rono L & 3ffis 4λji tnno EJ'Osai
Horn A'-2, o-11"4) '4 inside M7
Cutter 72 N-Nog Itto Ido Figure 4 Figure 5 Figure 12 Contract 0-ga 4 Figure 7 Figure 6 Figure 9 Figure 9 Procedure amendment (method) Indication of case Patent application in 1988 No. 114545 Title of the invention Person who corrects the paper cutting mechanism in a printing device 1. I defective Patent applicant name Ya 15IQ+Kaikagami Hitachi! ! i
TS Manufacturer's agent Subject of person's amendment Column for brief explanation of drawings in specification Brief explanation of drawings Figure 1 is a schematic front view of one embodiment of the present invention, Figure 2 is a schematic front view of one embodiment of the present invention
3 is a side view of FIG. 2, FIG. 4 is an explanatory diagram of parts of the suppressing member, FIG. 5 is a schematic front view showing the cutter in contact with cool paper, and FIG. The figure is a front view showing the contact point between the cutter and roll paper in figure 5, and figure 7.
The figure is a front view showing the state in which the cutter has started cutting cool paper, Figure 8 is a perspective view of the a-tally cutter, Figure 9 is a schematic perspective view of a cutting mechanism according to the prior art, and Figure 10 is a conventional It is an explanatory diagram showing a problem in the case of technology. 1.1°...Plate 2...Carrier 3...Feed screw 4...Guide shaft 5...Motor 6...Press member 7...Cutter +0-...Roll paper

Claims (1)

[Claims] 1. In a paper cutting mechanism in a printing device in which a carrier is moved in a direction intersecting the feeding direction of continuous recording paper and the paper is cut by a cutter that moves integrally with the carrier, when the paper is cut by the cutter; A guide wall for the paper is provided on both or either one of the supply side and the discharge side of the paper, which are before and after the moving line as a boundary, and a pressing member for pressing the paper against the guide wall is provided. A paper cutting mechanism in a printing device, characterized in that the paper cutting mechanism is provided integrally with a cutter, and the pressing member presses the paper against the guide wall when the cutter moves along the movement line.