KR20000058207A - Printer - Google Patents

Abstract

PURPOSE: A printer is provided to simply change a single-color output to a multi-color output by moving an ink ribbon in a widthwise since a cassette lifting unit is detachably attached to a side part of a printer main body, and freely set a rotation velocity of a cam gear by selecting the gear ratio of the cam gear. CONSTITUTION: A printer includes a frame equipped with an ink ribbon cassette and a cassette lifting unit detachably mounted at a side part of the frame for lifting the ink ribbon cassette. The cassette unit is able to transfer rotation force of a driving shaft mounted in the frame to a gear element(6) detachably and movably mounted in the frame, and includes a cam element(9) for lifting the ink ribbon cassette, a clutch element(7) for alternatively transmitting the rotation force of the gear element to the cam element, and an operational element(8) for connecting or disconnecting the clutch element, so that a single-color output printer is utilized as a multi-color output printer and the rotation velocity of the cam is freely set.

Description

Printer {PRINTER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer capable of changing the output color by moving the ink ribbon in the width direction, and more particularly, to a printer having a versatility capable of easily changing a monochromatic print output to, for example, a two-color print output. It is about.

In a two-color output printer, the color of the print output can be changed by moving the ink ribbon whose color varies in the width direction along the width direction. For example, Japanese Patent No. 586081 discloses a structure in which a cassette support portion for supporting an ink ribbon cassette is inclined by driving a cam by a motor. However, this printer has a problem in that the manufacturing cost is relatively high in that a dedicated motor is required to tilt the ink ribbon cassette of the printer. Further, Japanese Patent Laid-Open No. Hei 10-157261 discloses that an input shaft of a one-way clutch is mounted on a drive shaft for moving a print head, a cam is attached to an output shaft of a one-way clutch, and a one-way clutch is interrupted by a solenoid. Rotate the cam at any point in time. By doing so, the cassette support portion fitted to the cam can be tilted up and down.

However, since the printer is a dedicated printer for two-color printing output, there is a problem in that the manufacturing cost is relatively high and parts compatibility of the monochrome printing output printer is difficult. On the other hand, the technique disclosed in Japanese Patent Application Laid-open No. Hei 10-157261 has the disadvantage that the rotational speed of the cam cannot be changed, that is, there is no freedom because the rotation of the drive shaft is directly transmitted to the cam through the one-way clutch. have.

It is an object of the present invention to solve the above-mentioned disadvantages, and to provide a printer which can utilize the configuration of a monochromatic printing output printer, can lower the manufacturing cost, and can arbitrarily set the rotational speed of the cam. The purpose.

1 is a plan view showing a printer according to an embodiment of the present invention.

FIG. 2 is a side view of the printer as seen from arrow II of FIG. 1; FIG.

3 is a side view of the printer as viewed from the arrow III direction of FIG.

4 is a plan sectional view showing the cassette lifting unit.

FIG. 5 is a side view of the cassette lifting unit viewed from the arrow V direction of FIG. 4; FIG.

Fig. 6 is a plan view showing a printer equipped with a cassette elevating unit.

FIG. 7 is a side view of the printer as viewed from the arrow VII in FIG. 6; FIG.

A printer according to the present invention includes a printer main body having an ink ribbon cassette, and a cassette lifting unit detachably attached to the side of the printer main body to lift and lower the ink ribbon cassette, and the cassette lifting unit includes the printer main body. A bracket which is detachably mounted to the gear mechanism for transmitting the rotational force of the drive shaft for driving the print output head of the printer body, a cam mechanism for moving the ink ribbon cassette in the vertical direction, and a rotational force of the gear mechanism for the cam mechanism. And a drive mechanism for connecting and disengaging the clutch mechanism and the clutch mechanism to transmit.

In the printer of such a structure, an output color can be changed by moving an ink ribbon cassette up and down as needed, the rotational force of a drive shaft is transmitted to a cam mechanism through a gear mechanism, and a clutch mechanism, and a drive mechanism interrupts a clutch mechanism. . Therefore, since the cassette lift unit having such a configuration is mounted, a two-color print output or a multi-color print output printer can be constituted simply by attaching the cassette lift unit of the above configuration to the basic configuration of the monochrome print output printer. It is possible to make all parts of common. Further, by selecting a gear ratio by the gear mechanism, the rotational speed of the cam mechanism can be arbitrarily set freely.

Also, in such a configuration, the printer main body preferably includes a cassette support for supporting the ink ribbon cassette so as to freely tilt the end of the ink ribbon in the vertical direction by rotatably supporting the lower end to the printer main body. In addition, the bracket is connected to the first bracket and the first bracket detachably mounted on the side of the printer main body so that one end portion can move in a predetermined range in the vertical direction and is lifted by the cam mechanism, while the other end is a cassette. It is preferred to include a second bracket detachably mounted to the support. In addition, by supporting the gear mechanism, the cam mechanism, the clutch mechanism, and the drive mechanism with the first bracket, mounting of the cassette lifting unit to the printer main body is extremely simple, and it is easy to change to a two-color print output or a multi-color print output printer. I can do it.

In addition, the drive shaft preferably includes a rotation transmission shaft that protrudes from the side surface portion of the printer body and rotates in accordance with the rotation of the drive shaft. As this rotation transmission shaft, a part of the support shaft of a drive shaft may protrude from the printer main body, and the other shaft connected to the support shaft through a gear may be used. In addition, the gear mechanism includes a front gear engaged with the gear provided on the rotation transmission shaft and a rear gear connected to the front gear via the clutch mechanism, so that the drive shaft and the gear mechanism can be easily connected. . In addition, the cam mechanism preferably includes a cam which is provided in the rear end gear and is fitted in the vertical direction with the second bracket to move the second bracket in the vertical direction in accordance with the rotation of the rear end gear. In this way, the movement of the second bracket is constrained to the cam to ensure reliable operation.

Here, the clutch mechanism may be configured to be fixedly coupled to the same shaft so that the input gear, the trigger ring and the output gear are rotatable with each other. Specifically, the clutch spring is mounted on the outer circumference of the clutch barrel mounted on the center of the input gear, and one end of the clutch spring is caught by a trigger ring fixedly coupled to the inner circumference of the input gear. The clutch spring passes through the trigger ring and the other end of the clutch spring is caught in the output gear. In addition, the clutch spring sets the rotation direction of the input gear in accordance with the clamping direction of the clutch spring, the trigger ring and the output gear on the clutch spring rotates in accordance with the rotation of the input gear. When the trigger ring is stopped by a trigger such as a protruding means mounted on the outer circumference of the trigger ring, the trigger ring and the output gear rotate relative to the direction in which the clutch spring is loosened, so that the clutch barrel of the input gear is removed from the clutch spring. It is released and only the input gear rotates.

By mounting the trigger of the clutch mechanism at a plurality of circumferential positions and devising the shape of the cam controlled by the clutch mechanism, it is possible to incrementally set the stop position of the cassette support. In this way, it is possible to correspond to the ink ribbon having many colors. When the cassette support is tilted, the driving shaft is also rotated so that the print output head is moved to the printing position after stopping the tilt of the cassette support. The cam mechanism can also be attached to the output gear of the clutch mechanism.

In addition, if the drive mechanism for rotating the paper feeding motor and the drive shaft is disposed on the side surface on the opposite side of the cassette lifting unit of the printer main body, it is suitable because the space of the cassette lifting unit is secured. Further, the first bracket and the printer body may be arranged by forming a hole in the side surface of the printer body that fits with at least one of the gear shafts of the gear mechanism. By providing a hook that engages with a hole formed in the printer main body, screwing of the first bracket to the printer main body can be performed in one place.

Therefore, in the present invention, since the cassette lifting unit that lifts the ink ribbon cassette is detachably mounted on the side portion of the printer main body, the cassette lifting unit is attached to the basic configuration of the monochromatic printing output printer so that the two-color printing output or the multicolor printing output is performed. The printer can be configured, and the whole part can be implemented in a basic configuration. In addition, the rotational speed of the cam mechanism can be freely set by selecting the gear ratio with respect to the gear mechanism.

A. Configuration of Examples

A-1. Basic configuration of the printer

Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 7. 1 is a plan view of a printer and FIGS. 2 and 3 are side views of the printer. 1 to 3 show a state where the cassette lifting unit is not mounted. In the following description, when the direction is indicated, the upper part of FIG. 1 is the front end, the lower part is the rear end, and the left and right directions are as shown in FIG. In Fig. 1, reference numeral 1 denotes a frame (printer main body). The frame 1 includes a bottom plate portion 1a and a side plate portion 1b extending upward from both sides of the bottom plate portion 1a. The side plate portion 1b forms an approximately U-shaped when viewed from the side. The drive shaft 2 is rotatably supported by each side plate part 1b, 1b by the drive shaft (rotation transmission shaft) 20. As shown in FIG. A DC motor (not shown) is mounted on the inner surface of the side plate portion 1b on the right side of the frame 1 and the rotational force by the motor is transmitted to the drive shaft 2 via the gears 21, 22, and the like.

As shown in Fig. 1, the shaft 23 is hypothesized on the side plates 1b and 1b, and the carriage 24 is supported on the shaft 23 so as to slide along the axis. The carriage 24 is caught by the slit 2a provided on the outer periphery of the drive shaft 2 and moves along the axial direction along the rotation of the drive shaft 2. The print output head 25 is mounted on the carriage 24, and prints on a sheet of paper between the head 25 and the platen 26 provided on the side plates 1b and 1b.

In the figure, reference numeral 3 is a cassette support. Arms 31 and 32 for supporting the front and rear ends of the ink ribbon cassette 30 are arranged at the front and rear edges of the cassette support 3. A projection 33 projecting to the left side in FIG. 1 is formed on the rear end of the cassette support 3. On the other hand, the upwardly extending arm 11 is disposed on both sides of the rear end of the side plate portion 1b, and the hole-shaped hole 12 is formed in the upper end of the arm 11 (shown in FIG. 2). Since the projection 33 is inserted into the hole 12, the front end of the cassette support 3 can be tilted freely up and down within a predetermined angle about the projection 33. Also, as shown in Figs. 2 and 3, the stopper 34 extending forward and downward is disposed at the rear end of the cassette support 3. On the other hand, the arm 13 overlapped with the stopper 34 in the front-rear direction is disposed on the bottom plate portion 1a, and the arm 13 and the stopper 34 are mutually mounted by screws 14. In this way, the position of the cassette support 3 is fixed.

The ink ribbon cassette 30 is supported by a cassette support 30 constructed as described above. The arms 30a extending forward are formed at the left and right ends of the ink ribbon cassette 30. The ink ribbon 30b drawn out from the end of the arm 30a is inserted into the other arm 30a through a gap between the print output head 25 and the platen 26. The ink ribbon 30b is continuously wound in the ink ribbon cassette 30 and continuously sent by the ribbon feeder 30c which rotates while being engaged with the rotation of the drive shaft 2.

In Fig. 1, reference numeral 35 designates a paper feed roller unit. The paper feed roller therein is rotated by a stepping motor 36 and a gear train 37 to feed the paper inserted from the feed port 38 between the print output head 25 and the platen 26. do.

A-2. Configuration of Cassette Lifting Unit

The above is the basic configuration of the printer when the ink ribbon 30b is monochromatic. Next, the structure of a cassette lifting unit will be described with reference to FIGS. 4 and 5. In these figures, reference numeral 4 is a first bracket, and reference numeral 5 is a second bracket. The gear mechanism 6 is attached to the first bracket 4 by the shafts 40 and 41, and the clutch mechanism 7 is attached to the first bracket 4 by the shaft 42. The actuator (drive mechanism) 8 is attached on the first bracket 4 by the bracket 81. The cam mechanism 9 is mounted on the gear mechanism 6. In Fig. 5, reference numeral 44 denotes a hole for screwing the first bracket 4 to the frame 1. Now, the configuration from the gear mechanism 6 to the cam mechanism 9 will be described.

(1) gear mechanism

In the figure, reference numeral 60 denotes a first gear integrally formed with a large diameter gear (shear gear) 61 and a small diameter gear 62. The first gear 60 is supported by the first bracket 4 so as to be rotatable by the shaft 40. The large diameter gear 61 is coupled to the gear mounted to the drive shaft 20 so that the first bracket 4 is mounted to the frame 1. The small diameter gear 62 is engaged with the second gear 63 rotatably supported by the first bracket 4 by the shaft 41. The third gear (rear end gear) 64 is rotatably supported by the shaft 41.

(2) clutch mechanism

As shown in FIG. 4, the input gear 70 coupled with the second gear 63 is rotatably supported on the shaft 42. A clutch barrel 71 (right side in FIG. 4) protruding in the axial direction is formed at the center of the input gear 70. In the non-loading state, the clutch spring 72 having an inner diameter larger than the inner diameter of the clutch cylinder 71 is attached to the outer peripheral portion of the clutch cylinder 71. The trigger ring 73 is connected to the inner circumference of the input gear 70. One end of the clutch spring 72 is connected to the trigger ring 73. As shown in FIG. 5, a trigger 74 integrally formed as a protrusion is formed at the outer circumference of the trigger ring 73. The output gear 75 is rotatably supported on the outside of the trigger ring 73 by the shaft 42. The other end of the clutch spring 72 is connected to the inner end face of the output gear 75. The output gear 75 is coupled to the third gear 64 of the gear mechanism 6. In the figure, reference numeral 76 denotes an E-ring for preventing the output gear 75 from detaching.

The rotation direction of the input gear 70 is set to the fastening direction of the clutch spring 72. Therefore, when the input gear 70 rotates, the clutch cylinder 71 is engaged by the means by which the clutch spring 72 is engaged, and the trigger ring 73 and the output gear 75 connected to the clutch spring 72 are Rotate together. When the actuator 74 is brought into contact with the trigger 74 to stop as described below, the trigger ring 73 and the output gear 75 rotate relative to the direction in which the clutch spring 72 is loosened. The clutch cylinder 71 of the input gear 70 is released from the clutch spring 72, and only the input gear 70 rotates. Therefore, the rotational force is not transmitted to the output gear 75.

(3) actuator

In the figure, reference numeral 80 is a solenoid and is mounted on the first bracket 4 by brackets 81 and screws 82. When the iron core 83 formed integrally with the bracket 81 is inserted into the upper end of the solenoid 80, the iron core 83 penetrates the solenoid 80 and protrudes from the lower end of the solenoid 80. On the opposite side of the iron core 83, a hook 84 protruding forward is formed. In addition, a downwardly extending arm 85 is formed on an intermediate portion of the iron core 83 and the hook 84. On the lower end of the arm 85, the intermediate portion of the trigger arm 86 is supported so that it can be tilted freely in the vertical direction. The front end of the trigger arm 86 is pulled upward by a pull coil spring 87 located between the trigger arm 86 and the hook 84. In this manner, when the solenoid 80 is not magnetized, the trigger arm 86 touches the trigger 74 of the trigger ring 73 to disconnect the clutch mechanism 7. Further, the rear end of the trigger arm 86 is attracted to the iron core 83 by magnetizing the solenoid 80, whereby the trigger 74 is opened to connect the clutch mechanism 7.

(4) cam mechanism

At the rear end of the third gear 64 of the gear mechanism 6, the cam 90, which is circular from the side, eccentrically off-centered with respect to the shaft 41, is the third gear of the gear mechanism 6. It is formed integrally with the third gear on the end face of (64). On the other hand, the second bracket 5 is composed of a pedestal 50 facing in a substantially horizontal direction and a drive unit 51 extending downward to be orthogonal to the pedestal 50 and downwards, and a cam ( The plate 91 which is arrange | positioned so that 90 may be inserted from an up-down direction is formed. In addition, a long hole 92 is formed in the middle portion between the plates 91 so as to be inclined toward the rear, and the shaft 41 penetrates the long hole 92. According to the above configuration, when the third gear 64 rotates, the cam 90 rotates, and the plate 91 is pressed by the cam 90 so that the second bracket 5 moves along the long hole 92. Done.

A-3. Mounting structure of cassette lifting unit

Next, a configuration in which the cassette lifting unit is detachably mounted on the frame 1 will be described. First, a screw hole or a hole is formed on the distal end of the drive shaft 20 of the drive shaft 2 (not shown), and the screw or pin is inserted into the screw hole or the hole after the gear is fitted to the drive shaft 20. . The gear is fixed by screws or pins. A screw hole 52 and a protrusion 53 are formed on the pedestal 50 of the second bracket 5, and the holes 135 and 136 correspond to the screw hole 52 and the protrusion 53 to form a cassette support 3 on the cassette support 3. Is formed (see FIG. 1). In addition, the ends of the shafts 40, 41, 42 supported on the first bracket 4 project slightly from the rear surface of the first bracket 4. The projection 45 (see FIG. 5) is also formed on the rear surface of the first bracket 4. On the side plate portion 1b of the frame 1, holes 15, 16, 17, 18 fixedly coupled thereto are formed. In addition, a hook 46 (see FIG. 4) protrudes laterally on the rear surface of the first bracket 4, and a long hole 19 is formed in the side plate portion 1b of the frame 1. In addition, corresponding to the hole 44 of the first bracket 4, the screw hole 19a is formed in the side plate portion 1b.

B. Operation of the Embodiment

B-1. Monochromatic print output operation

Next, the operation of the monochrome print output will first be described with respect to the operation of the embodiment having such a configuration. When the sheet is inserted into the feed opening 38 of the sheet feeding roller unit 35, the sheet feeding roller inside rotates to stop the sheet after feeding the sheet between the print output head 25 and the platen 26. Next, print output is performed while the drive shaft 2 rotates and the print output head 25 moves. At this time, the ribbon feeder 30c rotates to transfer the ink ribbon 30b. When the print output of the first line is finished, the paper feed roller unit 35 advances the sheet by one line, and the print output of the next line is performed by the print output head 25. When the printing output of all the lines is finished, the paper feed roller unit 35 discharges the paper.

B-2. Mounting the cassette lift mechanism

Next, the procedure for changing a monochromatic print output printer to a two-color print output printer will be described. First, as shown in Figure 7, the gear 27 is fixedly coupled to the drive shaft 20, the rotation of the gear 27 is fixed by a screw or pin. Departure of the gear is prevented by the E-ring 28. In addition, the screw 14 which fixes the stopper 34 is removed, and the cassette support 3 is tilted. Next, the hook 46 of the first bracket 4 is hooked to the elongated hole 19 of the side plate portion 1b, and the first bracket 4 is brought into close contact with the side plate portion 1b. At this time, the shafts 40 to 42 and the projections 45 are fixedly coupled to the holes 15 to 18 of the side plate portion 1b. In this way, the large diameter gear 61 of the first gear 60 meshes with the gear 27 of the drive shaft 20. Then, the screw 47 passes through the hole 44 and is fastened to the screw hole 19a (see FIG. 7). Next, the pedestal 50 of the second bracket 5 is superimposed on the lower surface of the cassette support 3, and the protrusion 53 on the pedestal 50 is fixed to the hole 136. Next, the screw 47 passes through the hole 135 and is fastened to the screw hole 52. By this procedure, the two-color printout printer shown in Figs. 6 and 7 is constructed.

B-3. 2-color printout operation

Next, as described above, an operation of performing two-color print output by a printer equipped with a cassette elevation unit will be described. In the ink ribbon 30b in this case, the upper half upper portion in the width direction has a basic color (for example, black), and the lower half becomes another color (for example, red). In the state where the primary colors are printed out, the cassette support 3 is horizontally positioned, and the print output head 25 faces the primary colors of the ink ribbon. In the state shown in FIG. 5, since the trigger arm 86 abuts against the trigger 74, the clutch mechanism 7 is disconnected. Thus, the rotation of the gear 27 of the drive shaft 20 is transmitted to the input gear 70 of the gear mechanism 6 and the clutch mechanism 7, but no rotational force is transmitted in front of it. Therefore, the cassette support 3 is kept horizontal, and printing output of the primary color is continued.

At this time, when the solenoid 80 is magnetized, the rear end of the trigger arm 86 is attracted to the solenoid 80, and the front end of the trigger arm 86 is released from the trigger 74. In this way, the clutch mechanism 7 is connected and the trigger ring 73 and the output gear 75 rotate with the input gear 70. Accordingly, the third gear 64 of the gear mechanism 6 rotates together, and the cam 90 also rotates to push up the plate 91 of the second bracket 5. Then, the second bracket 5 rises along the long hole 92, and the cassette support 3 tilts upward with respect to the protruding piece 33. That is, the ink ribbon cassette 30 tilts upwards.

Next, when the magnetization of the solenoid 80 stops, the trigger arm 86 is inclined by the elasticity of the pulling coil spring 87 and attached to the outer circumferential surface of the trigger ring 73. Thereafter, the trigger 74 is rounded, abuts against the trigger arm 86, and the clutch mechanism 7 is disconnected. In this way, the rotation of the cam 90 stops, but at this time, the cam 90 is in a rotated state by 180 degrees, and the cassette support 3 is in a maximum inclined position. The lower portion of the ink ribbon (red) faces the print output head 25, and in this state, printing is performed by moving the print output head 25 to the next print output position. In addition, when returning a printed output color to a basic color, the solenoid 80 may be magnetized, the cam 90 may be rotated 180 degrees, and the cassette support 3 may be leveled.

In the printer with the above configuration, the rotation of the drive shaft 2 is transmitted to the cam 90 through the gear mechanism 6 and the clutch mechanism 7, and when necessary, the solenoid 80 lifts the clutch mechanism 7. It is possible to change the printout color by intermittently tilting the ink ribbon cassette 30. And since such a configuration is mounted on the cassette lifting unit, the monochrome printing output or the two-color printing output can be selected by simply mounting the cassette lifting unit to the monochrome printing output printer which is the basic configuration. The parts can be integrated. In addition, it is possible to set the rotational speed of the cam 90 freely by selecting the gear ratio by the gear mechanism 6.

In particular, in the above embodiment, since the gear mechanism 6, the cam mechanism 9, the clutch mechanism 7 and the actuator 8 are supported by the first bracket 4, the printer main body 1 of the cassette elevating unit By simplifying the installation of the furnace, it is possible to simply change the model of the printer. In addition, since the large diameter gear 61 is engaged with the gear 27 of the drive shaft 20 only by mounting the first bracket 4 to the printer main body 1, the drive shaft 2 and the gear mechanism ( 6) can be easily connected.

In addition, since the cam 90 is restrained in the up and down direction by the plates 91 and 91, it is possible to obtain reliable operation without playing in the second bracket 5. In addition, since the gears 21 and 22 for driving the paper feed motor 36 or the drive shaft 2 are disposed on the side surface of the printer main body 1 opposite the cassette lifting unit, sufficient space for the cassette lifting unit is provided. It can be secured. Since the holes 15 to 18 engaging with the shafts 40 to 42 and the projections 45 of the gear mechanism 6 are provided on the side plate portion 1b of the printer body 1, the first bracket 4 Positioning can be facilitated. In addition, since the hook 46 is formed on the first bracket 4 to engage with the long hole 19 of the side plate portion 1b, the first bracket 4 is attached to the printer body 1 only with the screw 47. ) Can be mounted.

In addition, in order to adjust the stroke of the trigger arm 86 at the time of magnetizing the solenoid 80, it is necessary to adjust the distance between the iron core 83 and the trigger arm 86, but it is attached to the frame 1. The stroke adjustment can be completed by loosening the screw 82 in the state of the cassette lifting unit and adjusting the position of the solenoid 80 before the end.

In this embodiment, although the cassette support 3 is comprised so that it may incline, it can also be comprised so that a vertical movement to an up-down direction may be possible.

According to the above description, the present invention detachably attaches the cassette lifting unit for lifting and lowering the ink ribbon cassette to the side surface of the printer main body. Therefore, the cassette raising and lowering unit is mounted only by using a monochromatic printing output printer. It is possible to configure a printout or a multicolor printout printer, and all the basic components are common. In addition, there is an effect that the rotational speed of the cam mechanism 90 can be set freely by selecting the gear ratio by the gear mechanism 6.

Claims (4)

A printer comprising a printer main body having an ink ribbon cassette and a cassette lifting unit detachably attached to the side of the printer main body to lift the ink ribbon cassette, The cassette lifting unit, Gear mechanism for transmitting the rotational force of the drive shaft for driving the print output head installed in the printer body to the bracket detachably mounted to the printer body, Cam mechanism for moving the ink ribbon cassette in the vertical direction, Clutch mechanism for selectively transmitting the rotational force of the gear mechanism to the cam mechanism, And a drive mechanism for coupling and disengaging the clutch mechanism. The method of claim 1, The printer main body includes a cassette support for supporting the ink ribbon cassette so as to freely tilt the end of the ink ribbon in the vertical direction by rotatably supporting the lower end to the printer main body. The bracket is connected to the first bracket and the first bracket detachably mounted on the side of the printer body so that one end portion can move in a predetermined range in the vertical direction and is lifted by the cam mechanism, while the other end is a cassette. A second bracket detachably mounted to the support; And the first bracket supports the gear mechanism, the cam mechanism, the clutch mechanism, and the drive mechanism. The method of claim 2, The drive shaft includes a rotation transmission shaft protruding from the side portion of the printer body to rotate in accordance with the rotation of the drive shaft, The gear mechanism includes a front gear meshing with a gear provided on a rotation transmission shaft and a rear gear connected to the front gear via a clutch mechanism. And the cam mechanism includes a cam provided in the rear end gear and configured to move the second bracket in the vertical direction in accordance with the rotation of the rear end gear by being fitted in the vertical direction with the second bracket. The method according to claim 1, wherein A drive mechanism for rotating the paper feed motor and the drive shaft in a side portion opposite to the cassette lifting unit of the printer body; And positioning the first bracket and the printer body by forming a hole in the side surface of the printer body that fits with at least one of the gear shafts of the gear mechanism.