JPH0582822B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a method for moving one desired type wheel, which is housed in a plurality of types, in a magazine mounted on a carrier so as to be movable, to a position suitable for printing, and moving it to the magazine. The present invention relates to a method of controlling a drive shaft of a wheel motor in a printing device accommodated therein.

Conventional technology Conventionally, printing is performed by positioning a desired type wheel, which is housed in a plurality of magazines suspended in a carrier movable in the axial direction of the platen, at a position suitable for printing. In the apparatus, the drive shaft of the wheel motor is rotated to a home position after the drive shaft of the wheel motor is detached from the type wheel when replacing the type wheel with another type wheel after printing is completed; There is no disclosure of technology regarding a method of controlling the drive shaft of the wheel motor that causes the rotation of the magazine motor or the upward or downward movement of the type wheel to overlap with each other.

Problems to be Solved by the Invention In conventional printing devices, after printing is completed, when replacing the type wheel located at a position suitable for printing with another type wheel in the same magazine, the wheel motor is driven. Since a separate time period for positioning the shaft at the home position is set and operated, there is a waiting time during that time period, which causes a problem in that the total printing speed decreases. The technical problem of the first invention and the second invention is to solve these problems and improve the total printing speed.

Means for Solving the Problems The first invention provides, after printing is completed, when replacing the type wheel located at a position suitable for printing with another type wheel in the same magazine, the drive shaft of the wheel motor is connected to the type wheel. A method for controlling a drive shaft of a wheel motor in a printing device in which the rotation of the drive shaft of the wheel motor to a home position after detachment from the wheel motor and the rotation of a magazine motor are operated in a superimposed manner. .

In the second invention, after printing is completed, when replacing the type wheel located at a position suitable for printing with another type wheel in the same magazine, the drive shaft of the wheel motor is disengaged from the type wheel. This is a method of controlling the drive shaft of a wheel motor in a printing device in which the subsequent rotation of the drive shaft of the wheel motor to the home position and the upward or downward movement of the type wheel are combined.

Effects In the first invention, when replacing a type wheel in the same magazine, the drive shaft of the wheel motor is rotated to the home position and the type wheel to be replaced is moved down to a position suitable for printing. Since the movement of the wheel motor and the magazine overlaps with each other, the time required to independently set the rotation of the wheel motor drive shaft to the home position is shortened.

In the second invention, when the type wheel is replaced in the same magazine, the rotation of the drive shaft of the wheel motor to the home position and the downward or upward movement of the type wheel are combined with each other, This shortens the time needed to independently set the rotation of the wheel motor drive shaft to the home position.

Embodiment 1 uses a platen, which is rotatably mounted on a conventionally known machine stand (not shown). 2 is a carrier, and this carrier 2 is also mounted on the above-mentioned machine base so as to be movable in the left-right direction (left-right direction in FIG. 5). 3 is a type wheel, and this type wheel has a type part 4 provided at the tip of a free piece formed radially. 5 is a boss thereof, 6 is a boss hole thereof, 7 is a bullet line for engagement provided from the boss 5 toward the boss hole 6, 8 is a case of the type wheel 3, and the cross section of this case is approximately A boss portion 10 is formed into a truncated shape and is provided with a boss hole 9, and a notch 1 connected to the boss hole 9.
1, a notch 14 for entry of the printing hammer 13, which has a substantially square cross section and is provided on the carrier 2 at approximately the center of the upper edge, and an operating plate on both sides of the notch 14. knobs 15 and 16 for use, a boss portion 18 having a boss hole 17 approximately at the center, and a pair of notches 1 for engagement at both side edges on approximately the center line of the boss hole.
9 and 20, and the type part 4 of the type wheel 3 is connected to the front side plate 1.
2, the boss 5 is attached to the front plate 12.
By engaging the boss hole 9 of the type wheel 3 and integrating the back side plate 21 and the front side plate 12, the type wheel 3 is placed in the storage groove 22 formed between the back side plate 21 and the front side plate 12. It is housed in a case 8 so that it can rotate freely and not fall out. Reference numeral 23 designates a magazine for accommodating a plurality of cases 8 in which the type wheels 3 are housed, and this magazine 23 is open at the top, and in the space 24, the cases 8 in which the type wheels 3 are housed are stored. are housed so that they can each be moved upwardly. Reference numeral 25 designates a storage stand for the magazine 23, and this storage stand 25 is connected to the carrier 2 via a shaft 26 provided on the carrier 2, a magazine motor 27, a gear group 28, a rack 29 provided on the storage stand 25, etc. It is suspended so that it can move in the left and right direction in FIG. 30 and 31 are a pair of shift arms, and one end of these shift arms is attached to both side plates 2a, 2 of the carrier 2.
Screws 33 and 34 are respectively screwed to positions protruding outward from both side plates 2a and 2b of the shaft 32, which is rotatably mounted between the shafts 2a and 2b.
In addition to long holes 35 and 36 for engagement being formed at the other end of each shift arm 31, an operating protrusion 3 is provided at the lower side of the approximate center of the shift arm 31 (in front of the approximate center in FIG. 1).
1' is provided, and in FIG.
A shift sensor SC is provided on the side plate 2b at a position corresponding to 1'. Reference numerals 37 and 38 denote a pair of engaging bodies, and each of these engaging bodies 37 and 38 has protrusions 39 and 40 for engagement protruding from both ends thereof, as well as a pair of notches 41 approximately at the center thereof. ，
41' and 42, 42' are bored respectively. 4
Reference numerals 3 and 44 refer to a pair of holes bored downward (toward the front in the figure) approximately in the center of the side plates 2a and 2b of the carrier 2 in the front-rear direction (left-right direction in FIG. 1). Both side edges 4 of one long hole 43 are made into long holes.
3', 43'', one protrusion 40 of one engaging body 37 is connected to the carrier 2 via the accommodating base 25, and one notch 19 of one of the multiple cases 8 stored in the magazine 23 is inserted. In the engaged state, the notches 41, 41' of the engaging body 37 are
Moreover, on both side edges 44' and 44'' of the other elongated hole 44,
While one protrusion 40 of the other engaging body 38 is engaged with the other notch 20 of the case 8, the notches 42 and 42' of that engaging body 38 are engaged with each other, and the other engaging body 37 is The projection 39 of the shaft 32 is engaged with the long hole 35 of the one shift arm 30, and the other projection 39 of the engaging body 38 is engaged with the long hole 36 of the other shift arm 31. Shift arm 30 by rotation,
31 makes it possible to give vertical movement to the case 8 (therefore, the type wheel 3 housed in the case 8) via the engaging bodies 37 and 38. 45 is a shift motor for rotating the shaft 32, and this shift motor 45 is fixed to the outside of one side plate 2a of the carrier 2 via a mounting bracket 46, and the rotation shaft 47 and the shaft 32 are connected to each other. Since the gear 48 fixed to the rotation shaft 47 and the sector gear 49 fixed to the shaft 32 regulate the amount of swing of the shift arm 31, the shift motor 45
As a result of the reverse rotation, the shift arm 31 is swung clockwise, and its operating protrusion 31' is connected to the shift sensor.
When positioned at SC, a computer (not shown) calculates the specified amount and rotation direction of the magazine motor 27 from the current position to the specified position based on the detection signal of the shift sensor SC, and uses the control signal to calculate the specified amount and rotation direction of the magazine motor 27 from the current position to the specified position.
The magazine motor 27 is rotationally controlled to move the magazine 23 together with the storage table 25, and after positioning the desired type wheel 3 among the plurality of types together with its case 8 at a position suitable for printing on the carrier, the computer By rotating the rotation shaft 47 of the shift motor 45 in response to a control signal, the type wheel 3 housed in the case 8 can be positioned together with the case 8 at a position suitable for printing, as shown in FIG. It's getting old. 50 is a wheel motor for driving the type wheel 3,
As shown in FIG.
1', 52, 52', and is driven from the hole 53 of the base plate 55, which is provided with a hole 53 for accommodating the drive motor 50 and a mounting portion 54 formed by bending upward at approximately the center thereof. The drive motor 50 is mounted on a base plate 55 by screwing 56 to the mounting portion 54 with a part of the motor 50 positioned below, and the ears 51, 51' and 52, 52' of the base plate 55 are attached. Engage with a pair of elongated guiding holes 58, 58' bored in the upper ends of both side plates 2a, 2b of the carrier 2, and connect the elongated holes 58, 58' with the ears 51, 51' and 52, 52. ’, the carrier 2
On the other hand, the wheel motor 50 is mounted together with a base plate 55 so as to be movable in the left and right direction in FIG. 59 is a drive shaft of the wheel motor 50;
60 is an actuating piece fixed to the rear end of the drive shaft 59 (in front in FIG. 6); 61 is the base plate 55;
When the actuating piece 60 is positioned on the wheel sensor 61, the home position of the drive shaft 59 is detected and a signal thereof is transmitted.
The shift motor 45 is configured not only to move the type wheel 3 up and down, but also to move the wheel motor 50 (therefore, the base plate 55) as will be described in detail later. 62 is a cam disk, and on one side there is also a transmission gear 63.
On the other side (right side in Figure 6), there is a grooved cam 6.
4, and a projection 65 for engagement is provided on a part of the outer periphery thereof. This cam disk 62 is located inside the side plate 2a (sixth
The cam disk 62 and the motor 45 are rotatably mounted on a shaft 66 (on the right side in the figure).
are related to each other via a gear 67 provided on the rotation shaft 47 and the gear 63, and the cam disk 62 can be rotated by rotation of the shift motor 45. There is. 68 is a crank, and one end of this crank 68 has a protruding pin 69 that engages with the grooved cam 64 of the cam disk 62, and the other end has a notch 70 for engagement.
is drilled. With the pin 69 engaged with the grooved cam 64, the crank 68 is connected to one end of the rotation shaft 71 (the left end in FIG. ) is screwed 72 nearby. Reference numeral 73 designates a swinging rod, and one end of the swinging rod 73 is screwed 74 near the other end (the right end in FIG. 6) of the rotating shaft 71. An engagement notch 75 is bored at the end. Reference numerals 76 and 76' designate a pair of engagement pins, and these pins 76 and 76' extend upward (frontward in FIG. ), a pair of ears 77 and 77' are formed by bending them toward
The pins 76 and 76' respectively protrude outward and are engaged with the notches 70 of the crank 68, and the pins 76' with the notches 75 of the swinging rod 73. Therefore, the grooved cam 64 and the pin 69 are engaged with each other by the rotation of the cam disc 62 via the gears 67 and 63 due to the rotation of the shift motor 45, and the crank 68 is caused to swing. The wheel motor 50 can be moved in the left-right direction in FIG. 7 together with the base plate 55 by the swinging and the swinging of the swinging rod 73 via the rotating shaft 71 due to the swinging. It's summery. Further, the front end (right end in FIG. 7) of the drive shaft 59 of the wheel motor 50 has an annular groove 78 that engages with the bullet 7 of the boss hole 6 of the type wheel 3; A disc portion 80 having a notch 79 at a position corresponding to the home position is arranged from the front end toward the rear end,
The disk portion 80 is formed in this order.
On the rear side (left side in Fig. 7), there is an engager 8.
1, the engaging element 81 of the bullet plate 82 is inserted through the notch 79, and the bullet plate 82 having a
It is fixed with a screw 83 so that it protrudes from the right side (in the figure) due to the elasticity of the bullet plate 82. 84 is a partition plate, and 85 is a notch bored in the upper part (front part in FIG. 7) of the central part in the left-right direction (left-right direction in FIG. 6) of the partition plate 84; When the partition plate 84 is positioned facing upward (towards the front in FIG. 7), the partition plate 84
The drive shaft 59 is located slightly forward of the drive shaft 59 and fixed between the side plates 2a and 2b of the carrier 2. Reference numeral 86 denotes a partition fitting having an L-shaped cross section, and the type wheel 3 housed in the case 8 passes through the partition fitting 86 between the upright portion 87 and the partition plate 84 together with the case 8. Both side plates 2 of the carrier 2 are removed, leaving a possible gap.
In addition to being fixedly provided between a and 2b, the upright portion 87 is located at a position opposite to a predetermined position (home position) of the engager 81 provided on the drive shaft 59 of the wheel motor 50. , a hole 88 is bored. Furthermore, when the case 8 in which the type wheel 3 is housed is moved in the left-right direction in FIG. The respective protrusions 40, 4 of the engaging bodies 37, 38 of
It is designed to move while being engaged with zero. Therefore, by appropriately setting the relationship between the amount of rotation of the shift motor 45, the gear 48, the sector gear 49, the pair of swinging rods 30, 31, etc., the partition plate 84 and the partition can be separated as described above. The type wheel 3 located below the metal fittings 86 together with its case 8,
The boss hole 6 of the type wheel 3 can be moved up to a position opposite to the drive shaft 59 (FIG. 7 shows this state) and moved down to the position of the magazine 23. It is now possible to accommodate them. 89 is the base plate 55
An engagement pin 90 stands up on one side near the front side (the left side near the front side in FIG. 6), and 90 is a first swinging rod. The horizontal surface portion 91 of the partition fitting 86 rests on a shaft 92 installed near the left end in FIG.
Due to the tension of the spring 94 stretched between the Not only is there a protrusion 95 for engagement formed by bending the paper in FIG. The other end of the actuating rod 97 is articulated with a tree 98, and has a square-shaped engaging portion 96 that engages with the pin 89 of the base plate 55. 99 is the second swinging rod, and this second swinging rod 9
9 is positioned below the first swinging rod 90 (on the back side of the paper in FIG. 6) and is suspended on the shaft 92, and the spring hook 100 and the partition fitting 86 are connected to each other. The outside is always energized to swing in one direction (clockwise direction in FIG. 6) by the tension of a spring 102 stretched between it and a spring hook 101 installed on a horizontal surface 91. ,
Not only is an engagement protrusion 103 protruding from one end, but the other end is provided with the cam disk 62.
The long hole 2d of the side plate 2a of the swinging rod 104, which is suspended over the rotation shaft 71, one end of which engages with the protrusion 65 of
Insert it through and connect the other end located on the outside with the connecting rod 1.
They are connected via 05. The second swinging rod 99 is caused to swing between the spring 102 via the connecting rod 105 by the swinging of the swinging rod 104 due to the engagement between the protrusion 65 of the cam disk 62 and the one end of the swinging rod 104.
It is designed so that it can be made to swing against the force of the wind. Further, the tension of the spring 94 for urging the first swinging rod 90 is configured to be stronger than the tension of the spring 102 for urging the second swinging rod 99, and the tension of the spring 94 for urging the second swinging rod 99 is stronger than the tension of the spring 102 for urging the second swinging rod 99. 90 is provided with a second swinging rod 99 protruding from one side (front side in FIG. 6) of the second swinging rod 99 through its protrusion 95 against the bias of the spring 102. The first swinging rod 90 can be swung until the protrusion 106 abuts and is received by the spring hook 101, and the first swinging rod 90
When the second swinging rod 99 is made to swing against the bias of the second swinging rod 99, the second swinging rod 99 swings following the tension of the spring 102 and the swinging of the first swinging rod 90.

6 and 7, one of the type wheels 3 in the magazine 23 connects its boss hole 6 to the wheel motor 50.
The actuating piece 60 is located at a predetermined position facing the drive shaft 59 of the wheel sensor 61 along with the case 8, and the drive shaft 59 is stopped at a predetermined position (home position). At the same time, the type wheel 3 is not attached to the drive shaft 59. In this state, the rotation shaft 47 of the shift motor 45 is rotated by a control signal from a computer (not shown), and the rotation causes the rotation of the cam disc 62, which causes the crank 68 to swing and rotate. By swinging the swinging rod 73 via the moving shaft 71, the wheel motor 50 is moved along with the base plate 55 to its drive shaft 5.
9 and move it toward the type wheel 3,
The annular groove 78 of the drive shaft 59 is engaged with the bullet line 7 of the boss hole 6 of the type wheel 3, and the base plate 5
As a result, the pin 89 of No. 5 engages with the engaging portion 96 of the starting rod 97 and causes the first swinging rod 90 to swing against the bias of the spring 94 via the starting rod 97.
As described above, the second swinging rod 99 swings under the tension of its spring 102, and its protrusion 103 passes through the hole 88 of the partition fitting 86 and the notch 11 of the case, and is inserted into the boss 5 of the type wheel 3. engage. Thus, the engagement hole 5' of the type wheel 3 is connected to the drive shaft 5.
When in the home position of 9, the protrusion 10
3 engages with the engagement hole 5' and temporarily stops the type wheel 3 at that position, and at the same time, the elasticity of the bullet plate 82 causes the engagement element 81 to engage with the engagement hole 5' of the type wheel 3. The drive shaft 59 is engaged in place of the protrusion 103 .
Since the type wheel 3 is to be attached to the type wheel 3, the protrusion 103 is stopped at a position where it is disengaged from the engagement hole 5' by the engaging element 81, and the protrusion is removed by the subsequent rotation of the cam disc 62 by the shift motor 45. 65 to the swinging rod 104 to connect the connecting rod 105.
, the second swinging rod 99 together with its protrusion 103 is moved back against the tension of its spring 102 (see FIGS. 13 and 14). In addition, when the type wheel 3 is not located at the above-mentioned position, the protrusion 103 of the second swing rod 99 is in contact with the surface of the boss 5 of the type wheel 3 under the tension of the spring 102, and the type is moved. Wheel 3 is drive shaft 5
9, due to the frictional engagement between the engaging element 81 of the bullet plate 82 and the back surface of the boss 5 of the type wheel 3, and the elastic engagement between the annular groove 78 of the drive shaft 59 and the bullet line 7, the first
When the type wheel 3 is rotated once in the direction of the arrow in FIG. When the second swinging rod 99 is swung by the tension of the spring 102, its protrusion 103 is engaged with the engagement hole 5', and the type wheel 3 is temporarily stopped at that position. (Figures 8 to 10 show this state). Next, the drive shaft 59 rotates to that position and stops upon receiving a detection signal from the sensor 61, and at the same time, the engagement element 81 of the bullet plate 82 collides with the protrusion 103 of the second swinging rod 99 due to the elasticity of the bullet plate 82. Then, the second swinging rod 99 is swung against the bias of the spring 102, and the protrusion 103 is disengaged from the engagement hole 5' of the type wheel. to mount the type wheel 3 in the home position of the drive shaft 59 (FIGS. 11 and 12 show this state). The subsequent rotation of the cam disk 62 by the shift motor 45 causes the protrusion 65 to
is engaged with the swinging rod 104, as described above,
The second swinging rod 99 is moved back (see Figure 13 and the first
Figure 4 shows this situation). In this state, the type wheel 3 is selectively rotated by the wheel motor 50 to perform printing. Next, after printing is completed, when the shift motor 45 is rotated in the opposite direction to that described above in response to a command to exchange with another type wheel 3 in the same magazine 23, each part operates in the opposite direction to that described above, and the printing is completed. The completed type wheel 3 is removed from the drive shaft 59, and together with the case 8, the shift arms 30, 31, the engaging body 37,
It is accommodated in the magazine 23 via 38 and the like. Next, in the first invention, the Hall motor 50 is rotated to position the drive shaft 59 of the wheel motor 50 at the home position, and the other type wheel 3 to be replaced in the magazine 23 is positioned below the position suitable for printing. The rotation of the magazine motor 27 is combined with the rotation of the magazine motor 27 to position the drive shaft 59 of the wheel motor 50 at the home position and the type wheel 3 to be replaced at a lower position suitable for printing.

Further, in the second invention, the type wheel 3 that has completed printing as described above is replaced by a command to replace the type wheel 3 with another type wheel 3 in the same magazine 23 after printing is completed.
After the drive shaft 59 of the wheel motor 3 is disengaged from the drive shaft 59, the drive shaft 59 is positioned at the home position, and the rotation of the Hall motor 50 and the case 8, the shift arms 30, 31, the engaging bodies 37, 38, etc. The shift arms 30, 31 and the engaging body after lowering the type wheel 3 accommodated in the magazine 23 via the lower movement or positioning the other type wheel 3 in the magazine 3 to be replaced at a lower position suitable for printing. 3
7, 38, etc. to position the type wheel 3 at a position suitable for printing, and the overlapping operation moves the drive shaft 59 of the home motor 50 to the home position, and after the printing is completed. The type wheel 3 is placed in the magazine 23 or the other type wheel 3 to be replaced is placed in a position suitable for printing.

Effects of the Invention As described above, in the first invention, the drive shaft of the wheel motor is removed from the attached state with the type wheel when replacing with another type wheel in the same magazine after printing is completed. Since this is a control method in which the rotation of the drive shaft to the home position and the rotation of the magazine motor are operated simultaneously, in the second invention, the rotation of the drive shaft of the wheel motor to the home position at the time of replacing the type wheel described above is Since this is a control method that overlaps the rotation to the position and the upward or downward movement of the type wheel, in either control method, the rotation of the drive shaft of the wheel motor to the home position It is possible to improve the total printing speed by that amount of time without having to set a separate time, and the effects of being able to solve the problems of conventional products with an extremely simple control method are extremely large. be.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a side view with a part cut away, FIG. 2 is a rear view of a part, and FIG. 3 is a side view with a part cut away and shown in cross section. Figure 4 is a partial perspective view, Figure 5 is a partial front view with a partial cross section, Figure 6 is a partial plan view with a partial cross section, and Figure 7 is a side view as well. Fig. 8 is a plan view of the same state shown in a different operating state from Fig. 6, Fig. 9 is a partial side sectional view, Fig. 10 is a partial rear view, and Fig. 11 is different from Fig. 9. Side sectional view of a portion shown in operating condition, 1st
Fig. 2 is a rear view of a part shown in a different operating state from Fig. 10, Fig. 13 is a side view of a part shown in an operating state different from Fig. 7, and Fig. 14 is a part shown in an operating state different from Fig. 8. FIG. 15 is a plan view of a portion shown in an operating state; FIG. 15 is a flowchart of the first invention; FIG.
FIG. 7 is a flowchart of the second invention. DESCRIPTION OF SYMBOLS 1...Platen, 2...Carrier, 2a, 2b...Side plate of carrier 2, 2c...Long hole, 2d...Long hole, 3...
Type wheel, 4...Type part, 5...Boss, 5'...
Engagement hole, 6...Boss hole, 7...Bullet line, 8...Case, 9
... Boss hole, 10... Boss, 11... Notch, 12... Front side plate, 13... Printing hammer, 14... Notch, 15, 16
...Pinch, 17...Boss hole, 18...Boss, 19,20
...a pair of notches, 21...back side plate, 22...storage groove, 2
3... Magazine, 24... Space of magazine 23, 25
...accommodation stand, 26...axis, 27...magazine motor, 2
8... Gear group, 29... Rack, 30, 31... Pair of shift arms, 31'... Operating protrusion, SC... Shift sensor, 32... Shaft, 33, 34... Screw fixing, 35,
36... Long hole, 37, 38... Pair of engaging bodies, 39,
40...Protrusion, 41, 41', 42, 42'...Notch,
43, 44...pair of long holes, 43', 43''...long hole 4
3, both sides of the hole 44, 44', 44''... both sides of the long hole 44,
45...Shift motor, 46...Mounting bracket, 47...Rotating shaft, 48...Gear, 49...Sector gear, 50...Wheel motor, 51, 51', 52, 52'...Ear portion,
53...hole, 54...attachment part, 55...base plate, 56...
Screw fastening, 58, 58'...Pair of long holes, 59...Drive shaft, 60...Operating piece, 61...Wheel sensor, 6
2...Cam disk, 63...Gear, 64...Groove cam, 65...
Protrusion, 66...shaft, 67...gear, 68...crank,
69...pin, 70...notch, 71...rotation shaft, 72...
Screwed, 73... Swinging rod, 74... Screwed, 75
...Notch, 76,76'...Pair of pins, 77,7
7'...Pair of ears, 78...Annular groove, 79...Notch,
80... Disk portion, 81... Engagement element, 82... Bullet plate, 83
…Screw, 84…Partition plate, 85…Notch, 86…Partition metal fitting, 87…Standing part, 88…Hole, 89…Pin, 9
0... Swinging rod, 91... Horizontal surface part, 92... Shaft, 93...
Spring hook, 94...Spring, 95...Protrusion, 96...Engagement part, 97...Starting rod, 98...Shaft, 9
9...Second swinging rod, 100...Spring hook, 10
1...Spring hook, 102...Spring, 10
3... Protrusion, 104... Swinging rod, 105... Continuous rod, 10
6...Tsuko.

Claims (1)

[Claims] 1. Printing by positioning a desired type wheel, which is housed in a plurality of magazines mounted on a Chiaria movable in the axial direction of the platen, at a position suitable for printing. In a printing device that is used for printing, the home of the drive shaft of the wheel motor after the drive shaft of the wheel motor is detached from the type wheel when replacing it with another type wheel in the same magazine after printing is completed. A method for controlling a drive shaft of a wheel motor in a printing device, characterized in that the rotation to a position and the rotation of a magazine motor are overlapped. 2. In a printing device that prints by positioning a desired type wheel, which is housed in a plurality of movable type wheels in a magazine suspended in a chia rear that is movable in the axial direction of the platen, at a position suitable for printing. , After printing is completed, when replacing the type wheel with another type wheel in the same magazine, rotation of the drive shaft of the wheel motor to the home position after the drive shaft of the wheel motor is detached from the type wheel. 1. A method for controlling a drive shaft of a wheel motor in a printing device, characterized in that the above-mentioned movement and upward movement or downward movement of a type wheel are operated in a superimposed manner.