JPH0332868A - Printer - Google Patents

Abstract

PURPOSE:To make a printer compact and light-weight at low cost by moving back and forth a mechanical part for cutting or stamping paper using a motor for rotation of a paper feed roller. CONSTITUTION:After ending printing, a stepping motor 23 rotates in 'B' direction and a gear pulley 22 rotates in 'B' direction, if a cutting signal is output. However, the rotation in said direction is not transmitted to a platen shaft 13 by a one-way clutch 26 and therefore, paper 61 is not fed. In the meantime, if the gear pulley 22 is rotated in 'B' direction, a groove cam 31 rotates in 'A' direction, and an engagement pin 44 located in the first cam groove 34 reaches a guide part 37, guided by the first cam groove 34 following the rotation of the groove cam 31 in 'A' direction. In this case, since the edge of the guide part 37 is a step 37A the pin 44 does not advance to the first cam groove 34 but is guided to the second cam groove 35. Then the engagement piece 46 sways vertically with a shaft 42 working as a fulcrum depending upon the eccentric value of the second cam groove 35. Consequently, a movable blade 57 sways and a cutter arm 43 cuts paper 61.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a printer. More specifically, the present invention relates to a printer in which a motor that drives a paper feed roller can be used as a drive source for a cutter machine that cuts paper or a stamp machine that stamps a stamp on paper.

[Prior Art] A paper feed motor rotated by a motor and a reciprocating member that reciprocates relative to the paper sent out by the paper feed motor, such as a movable blade that reciprocates relative to the paper, is used. A stamp R that stamps the paper with a stamp that moves back and forth against the side of the cutter 1a that cuts the paper and the paper.
A printer having a side view is also known.

Conventionally, in this type of printer, a motor or solenoid other than the paper feed roller motor is used as the drive source for reciprocating the movable blade of the cutter mechanism or for moving the stamp in the forward direction. I am using it.

For example, in the cutter mechanism, as shown in FIG. 11, one end is rotatably supported by a shaft 1, and the movable blade 3 reciprocates with respect to a fixed blade 2, and the base end is rotatably supported by a shaft 4. The tip of the cutter arm 5 is engaged with the cutter arm 5, and the cutter arm 5 is always held upward by the spring 6, that is, fixed blade 2.
The structure is such that a solenoid 7 is connected to the cutter arm 5 and biased in a direction away from the cutter arm 5 .

Therefore, when the solenoid 7 is energized when cutting the paper 8,
The tip of the cutter arm 5 is rotated downward about the shaft 4 as a fulcrum. Then, the other end of the movable blade 3 is rotated downward about the shaft 1, so that the paper 8 is cut by the forward shearing force between the movable blade 3 and the fixed blade 2.

Note that in the case where a motor other than the motor for the paper feed roller is used as a drive source, the rotation of the motor is converted into reciprocating motion of the =r moving blade 3 by a cam.

[Lesson 21 that the invention attempts to solve! ] In this way, in the conventional printer, the cutter N t+')
The drive source that reciprocates the movable blade of the printer or the stamp of the stamping mechanism uses a motor or solenoid that is separate from the motor of the paper feed roller, resulting in high costs, as well as compactness and light weight. This has become an obstacle to the development of

SUMMARY OF THE INVENTION An object of the present invention is to solve these conventional problems and provide a printer that is inexpensive, compact, and lightweight.

[Means for Solving the Problems] Therefore, in the present invention, the cutter mechanism and the stamping mechanism normally operate when the paper is not being fed, that is, when the motor that drives the paper feed roller is stopped. This paper is designed so that the motor of the paper feed roller can be used as a drive source for the cutter w4 or the stamping mechanism.

Specifically, in a printer that has a paper feed motor rotated by a motor, and a mechanism section that includes a reciprocating member that reciprocates with respect to the paper sent out by the paper feed motor and cuts the paper or stamps the paper. , the motor is controlled by a motor capable of forward and reverse rotation, a one-way clutch is provided between the motor and the paper feed motor to transmit only one direction rotation of the motor to the paper feed roller; An eraser cam that rotates in the opposite direction is provided, and an engagement pin that engages with the eraser cam and causes the reciprocating member to reciprocate is provided so as to be movable in the reciprocating direction of the reciprocating member. a first cam groove having an annular or substantially annular shape centered on the rotation center axis of the cam and having a groove width that allows the engagement pin to slidably engage; and a part of the first cam groove. a second cam eraser that is annular and has a groove width that is substantially the same as the groove width of the first cam eraser; When the first cam is rotated by rotation of the motor in one direction, the engaging pin is positioned in the first cam groove, and the second cam is rotated by rotation of the motor in the other direction. In some cases, the structure includes a guide means for guiding the engaging bottle to the second cam meat.

[Work] When feeding paper, the motor rotates in one direction.

Then, since the rotation of the motor is transmitted to the paper feed roller by the one-way clutch, the paper is fed by the rotation of the paper feed roller. At this time, since the grooved cam also rotates or the engagement pin is positioned in the first cam groove by the kite means of the clear cam, the engagement pin is in a stopped state. Therefore, since the aNN group reciprocating member does not move back and forth, the paper is not cut or stamped on the paper.

On the other hand, when cutting paper or stamping paper, the motor is rotated in the other direction. Then, the rear cam is rotated in the opposite direction. When the eraser cam is rotated in the opposite direction, the engagement pin is guided into the second cam groove by the guide means of the spring cam, so that the engagement pin is moved away from the center axis of rotation of the second cam. It is moved by the change in distance of , that is, the face center distance. Therefore, since the reciprocating member of the n-section also reciprocates, the paper is cut or stamped on the paper. At this time, the rotation of the motor in the other direction is not transmitted to the paper feed roller by the one-way clutch, so the paper is not fed.

[Practice] An embodiment of the present invention will be described below with reference to FIGS. 1 to 9. In this embodiment, the motor that drives the paper feed roller is used as the drive source for the drive blade of the cutter mechanism.

FIG. 1 shows an exploded perspective view of this embodiment. In the same figure,
11 is a frame. A platen shaft 13 of a rubber platen 12 which also serves as a paper feed roller is rotatably supported on both side walls of the frame 11, and a shaft 14 is supported parallel to the platen shaft 13. The shaft 14 has the platen 12 at its tip.
The base of the thermal head unit 16, which has a thermal head 15 in contact with the bottom 111, is rotatably supported. The thermal head unit 16 has a spring 1
6. The platen shaft 1 is constantly urged to rotate in the direction of contacting the thermal head 15 or the platen 12 by the platen shaft 1.
-Il of said frame 11 of 2! A gear pulley 22 having a gear portion 21 is attached to one end protruding from the I wall. A gear pulley 22 and a stepping motor 23 attached to one side wall of the frame 11 and capable of forward and reverse rotation.
A timing belt 25 is connected between the motor pulley 24 and the
The hook is being turned. Here, inside the gear pulley 22,
The rotation of the stepping motor 23 in one direction, here only the rotation in the direction A in FIG.
A one-way clutch 26 is built in to transmit the signal to the vehicle. Therefore, when the stepping motor 23 rotates in the opposite direction (direction B in FIG. 1), the platen 12 remains stopped.

The gear part 21 of the gear pulley 22 has the frame 1
A gear portion 32 of a grooved cam 31 rotatably attached to the wall of No. 1 is engaged with the grooved cam 31. A home position detection photosensor 41 attached to one side wall of the frame 11 faces the eraser cam 31, and a gf
An engagement pin 44 of a cutter arm 43 rotatably supported by a shaft 42 protruding from one side wall of the frame 11 is engaged. In the cutter arm 43, the engagement pin 44 is housed at an intermediate position so as to be able to move forward and backward in a direction perpendicular to the cutter arm 43 and always protrude by means of a lever spring 45. An engagement piece 46 that engages with the movable blade 57 of the cutter mechanism 51 is formed.

The cutter mechanism 51 is fixed to the front end of the frame 11 and has a paper outlet 5 through which a paper 61 printed by the platen 12 and the thermal head 15 is delivered.
2, a fixed blade 54 fixed facing the paper delivery port 52 of the base 53, and a fixed blade 54 fixed to the base 53 facing the paper delivery port 52;
A movable blade 57 which is open opposite to the fixed blade 54 with one end rotatably supported by a shaft 55 and whose other end has an engagement hole 56 in which the engagement piece 46 of the cutter arm 43 engages. , and a leaf spring 58 that constantly biases the movable blade 57 toward the base 53.

FIG. 2 shows the detailed structure of the grooved cam 31. In the same figure, the eraser 31 has the gear portion 32 formed on its outer circumferential surface, and has a square hole 33 for home position detection detected by the home position detection photosensor 41 inside, and a first cam hole. 34, second cam clearing 35,
Guide portions 36 and 37 constituting the kite means are respectively formed.

The first cam groove 34 has an annular shape with a constant radius centered on the rotation center axis of the groove cam 31, and has a groove width such that the engagement pin 44 of the cutter arm 43 is slidably engaged with the first cam groove 34. formed into a shape.

Further, the second cam groove 35 has a radius smaller than the radius of the first cam groove 34 centered on a position eccentric to the rotation center axis so as to share a part of the first cam groove 34. The first cam groove 34 is also formed in a large annular shape and has a groove width that is approximately the same as that of the first cam groove 34 . That is, the second cam groove 35 is formed in a shape having a trajectory whose distance from the rotation center axis gradually varies.

The guide portion 36 is connected to the first and second guide springs 34.
, 35, and when the cam eraser 3I is rotated by the unidirectional rotation of the stepping motor 23 (rotation in 8 directions in FIG. 1), the cutter arm 4
The third engagement pin 44 is positioned in the first cam groove 34 . That is, as shown in the cross section of FIGS. 3 and 4 and the perspective view of FIG. Furthermore, as the second cam groove 35 moves counterclockwise in FIG. ing.

The guide section 37 is connected to the first and second kite erasers 34.
．． When the cam eraser 31 is rotated by rotation of the stepping motor 23 in the other direction (rotation in the direction B in FIG. 1), the force cam arm 43
The engagement pin 44 is formed in a shape that guides the engagement pin 44 into the second cam groove 35. That is, as shown in the cross section of FIGS. 5 and 6 and the perspective view of FIG. Further, as the first cam groove 34 moves clockwise in FIG. 2 from the stepped portion 37A, the inclined surface 37 gradually slopes toward the groove bottom and becomes flush with the groove bottom surface.
It is formed in B.

Next, the operation of this embodiment will be explained.

First, in a state where the paper 61 is inserted between the platen 12 and the thermal head 15, when an energization printing signal is given to the thermal head 15, the thermal head 15
Printing is performed on the paper 61 by driving the .

Next, when the stepping motor 23 is energized and rotated in the direction A in FIG. 1, the gear pulley 22 is rotated in the direction A in FIG. 1 via the timing bells 1 to 25. Then, the rotation of the gear pulley 22 in the A direction is transmitted to the platen shaft 13 via the one-way clutch 26, so that the paper 61 is fed toward the cutter mechanism 51.

At this time, the clear cam 31 rotates in the direction B in FIG. Then, the engagement pin 44 of the cutter arm 43 located in the first cam groove 34 of the eraser cam 31 climbs over the inclined surface 37B of the guide portion 37 as the eraser cam 31 rotates in the direction B. Afterwards, since it comes into contact with the stepped portion 36A of the guide portion 36, it does not advance to the second cam groove 35 but is located within the first cam groove 34. Therefore, since the cutter arm 43 is stopped in the state shown in FIG. 8, the movable blade 57 of the cutter mechanism 51 is not operated, that is, the paper 61 is not cut.

Next, when a cut signal is issued after printing is completed, the stepping motor 23 is rotated 1 ril in the direction B in FIG.

Then, gear pulley 2 is activated via timing bells 1 to 25.
2 is rotated in the direction B in FIG. 1, but since the rotation in the same direction is not transmitted to the platen shaft 13 by the one-way clutch 26, the paper 61 is not fed.

On the other hand, when the gear pulley 22 is rotated in the direction B, the cam eraser 31 is rotated in the direction A in FIG. Then, cam eraser 3
The cutter arm 4 located in the first cam groove 34 of 1
The engagement pin 44 of No. 3 rotates the cam eraser 31 in the A direction.
'F, it reaches the guide part 37 while being guided by the first cam iJ34. At this time, since the end of the guide portion 37 in contact with the inner circumferential edge of the second cam groove 35 is a stepped portion 37A, it does not advance to the first cam groove 34 but is guided into the second cam groove 35. Ru. Then, as shown in FIG. 9, the engagement piece 46 of the cutter arm 43 swings up and down about the shaft 42 due to the eccentricity of the second cam cleaner 35, so that the cutter mechanism 5
The movable blade 57 of No. 1 is also swung. As a result, the paper 61 is cut.

Eventually, when the eraser 31 rotates once in the A direction, the home position detection square hole 33 is detected by the home position detection photosensor 31.

Then, the stepping motor 23 is rotated by a certain number of steps in the direction A in FIG.
4 and is placed on standby at the home position (position indicated by the chain double-dashed line in FIG. 2).

Therefore, according to this implementation plan, the movable blade 57 of the cutter l1tilI51 is reciprocated using the step-y ping motor 23 that rotates the platen 12, which also serves as a paper feed roller. Compared to those that use motors or solenoids, they are cheaper, smaller, and lighter.

In particular, the first cam cleaner 34, the second cam cleaner 34, and the second
A cam eraser 3 having a cam eraser 35 and a guide portion 36° 37
1, it is structurally simple and can be manufactured at low cost.

In addition, a square hole 33 for home position detection is formed in the clear cam 31, and this square hole 33 for home position detection is
Since the home position detection photosensor 41 for detecting the cutter 1 is provided, one reciprocating motion of the movable blade 57 of the cutter 1 can be completed.

In the above embodiment, the rotation of the stepping motor 23 is transmitted to the gear pulley 22 having the one-way clutch 26 via the timing belt 25, and the rotation of the gear pulley 22 rotates the rear cam 31. The rotation may be transmitted to the rear cam 31 directly or via another transmission mechanism.

Further, in the above embodiment, the guide portion 36.37 having the step portions 36A, 37A and the inclined surfaces 36B, 37B is formed in the shared portion of the first and second cam eraser 34.35 of the cam eraser 31. Similar effects can be expected with the configuration shown in FIG. This is because the first and second cam cylinders 34, 35
An arc-shaped partition plate 38 constituting a guide means is swingable at -11111 of the common part of the cam eraser 34 about the intersection of the outer circumferential edge of the first cam eraser 34 and the inner circumferential edge of the second cam eraser 35. After mounting, the partition plate 38 is urged to rotate outward by a spring 40A or the like. In addition, on the other side of the common part of the first and second cam 3=1,35, the first cam 3 is attached.
An arc-shaped partition plate 3 constituting a guide means centered at a position where the outer circumferential edge of 4 and the inner circumferential edge of the second cam 35 intersect.
9 is swingably attached, and the partition plate 38 is urged to rotate inward by a spring 40B or the like.

In the above embodiment, the first cam 34 is formed in an annular shape, but the movable blade 57 does not cut the paper 61 even if the cam eraser 31 rotates in the direction A in FIG. Since there is no problem even if the cutter arm 43 swings, the first cam eraser 34 may have a substantially annular shape that allows the cutter arm 43 to swing within this range.

Further, in the above embodiment, the second cam eraser 35 is formed in an annular shape, but the second cam eraser 35 does not have to be annular. In short, any annular shape may be used as long as the distance from the center axis of rotation of the cam 31 gradually varies, so for example, an elliptical shape may be used.

Further, in the above embodiment, the cutter arm 43 and the movable blade 57 are configured to swing, but they may also be configured to move in parallel.In short, they only need to move reciprocatingly.

In the above explanation, the stepping motor 23 of the platen 12, which also serves as a paper feed roller, is connected to the movable blade 51 of the cutter 1
7, the present invention is not limited to this, and can also be used as a drive source for a stamp in a stamping mechanism. In this case, the movable blade 5
You can replace 7 with a stamp.

[Effects of the Invention] As described above, according to the present invention, the motor that rotates the paper feed roller is used to reciprocate the reciprocating member of the mechanism section that cuts the paper or stamps the paper. Compared to the conventional method that uses a dedicated motor and solenoid, it is less expensive, and moreover, it can be made smaller and lighter.

[Brief explanation of drawings]

Figures 1 to 9 show one embodiment of the present invention.
The figure is an exploded perspective view showing the main parts, Figure 2 is a front view showing the lecture cam, Figure 3 is a cross-sectional view of Figure 2, and Figure 4 is a cross section taken along line IV-IV in Figure 2. 5 is a sectional view taken along the line V-V in FIG. 2, FIG. 6 is a sectional view taken along the VlvI line in FIG. 2, FIG. 7 is a perspective view showing the first and second cam erasers, and FIG. 9 is a diagram showing the state of the cutter arm when paper is being fed, and FIG. 9 is a diagram showing the state of the cutter arm when cutting paper. FIG. 1O is a front view of a decam showing a modified example of the kite means. FIG. 11 is a perspective view showing a conventional cutter mechanism. 12...Platen (paper feed roller), 23...Stepping motor, 26...One-way clutch, 31...Groove cam, 34...First cam eraser, 35...Second Cam spring, 36.37...Guide part (guide means) 38.39...
・Partition plate (guide means) 43... Cutter arm, 44... F fruit bin, 46... Engagement piece, 51... Cutter IIi! R1 57...Movable blade (reciprocating member)

Claims (1)

[Claims] (1) In a printer having a paper feed motor rotated by a motor, and a mechanical section that includes a reciprocating member that reciprocates with respect to the paper sent out by the paper feed motor and cuts the paper or stamps the paper, the above-mentioned The motor is constituted by a motor that can rotate in forward and reverse directions, and a one-way clutch is provided between this motor and the paper feed motor to transmit only one-way rotation of the motor to the paper feed roller. A grooved cam that is rotated is provided, an engagement pin that engages with the grooved cam and causes the reciprocating member to reciprocate is provided so as to be movable in the reciprocating direction of the reciprocating member, and the grooved cam is A part of the first cam groove is shared with a first cam groove that is annular or substantially annular and has a groove width that allows the engagement pin to slidably engage with the engagement pin. and a second cam groove having an annular shape having a locus that gradually differs in distance from the rotation center axis and having a groove width substantially the same as that of the first cam groove;
and a grooved cam provided in a common part of the second cam groove, so that when the grooved cam is rotated by the rotation of the motor in one direction, the engagement pin is positioned in the first cam groove, and when the grooved cam is rotated in the other direction of the motor, the groove is 1. A printer according to claim 1, further comprising guide means for guiding said engaging pin into a second cam groove when a cam is rotated.