JPH0679948A - X-y driving device for serial printer - Google Patents

Abstract

PURPOSE:To drive the X-axis driving as well as the Y-axis driving of a serial printer by one set of motor and contrive the reduction of size and weight of the printer. CONSTITUTION:An intermediate gear 9 is attached to a supporting plate 6, whose rotating center coincides with the rotary shaft 4 of a stepping motor 3, while a X-axis driving gear 10 and a Y-axis driving gear 11 are arranged at the left side and the right side of the intermediate gear 9. A two-way pawl clutch piece 8, slidable with respect to the gear supporting plate 6, is mounted. A motor fixing plate 2 is provided with clutch engaging units 35, 36. The engagement of the two-way pawl clutch piece 8 is switched to the engaging units 35, 36 and a motor gear 23 by a solenoid 12. When the two-way pawl clutch piece 8 is engaged with the motor gear 23 and a motor 3 is turned, the gear supporting plate 6 is turned and the intermediate gear 9 can be switched to the driving gear 10 of X-axis or the driving gear 11 of Y-axis. When the solenoid 12 is put OFF, the two-way pawl clutch piece 8 is engaged with the engaging unit 35 or the engaging unit 36 by a twisting coil spring 32 whereby the gear supporting plate 6 is fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a serial printer, and more particularly to a printer head and an XY drive device for driving print paper.

[0002]

2. Description of the Related Art A conventional XY drive device for a serial printer uses a motor for each of the X and Y drive mechanisms.
The X-axis motor reciprocates the head carriage and the printer head in the X direction, and the Y-axis motor drives the feed roller to feed the print paper in the Y direction.

[0003]

In the conventional serial printer, separate motors are used for driving in the X direction and the Y direction, which is a cause of increasing the size and weight of the printer. Therefore, there is a technical problem to be solved in order to reduce the number of motors and reduce the size and weight of the serial printer, and the present invention aims to solve the problem.

[0004]

The present invention is proposed in order to achieve the above-mentioned object, and a motor gear (23) is fitted on a rotating shaft (4) of a motor (3) to form the rotating shaft (4). ) Is provided with a rotatable gear support plate (6) whose center of rotation coincides with the intermediate gear (9) meshing with the motor gear (23). ), The X-axis drive gear (10) and the Y-axis drive gear (11) are arranged, the two-way claw clutch piece (8) is mounted on the gear support plate (6), and the intermediate gear (9) Is X
In the state of meshing with the axial drive gear (10) or the Y-axis drive gear (11), the two clutch engagement portions (35, 36) with which the two-way pawl clutch piece (8) can be engaged are provided with the gear support plate ( 6), a clutch switching means such as a solenoid (12) is provided, and the two-way claw clutch piece (8) is arranged in the direction of the motor gear (23) and the direction of the clutch engaging portions (35, 36). The gear support plate (6) is rotated by engaging the two-way claw clutch piece (8) with the motor gear (23) and rotating the motor (3). The present invention provides an XY drive device for a serial printer configured to mesh the gear (9) with the X-axis drive gear (10) or the Y-axis drive gear (11).

[0005]

The gear support plate that supports the intermediate gear that meshes with the motor gear is rotatable about the axis of the motor. The intermediate gear meshes with the X-axis drive gear or the Y-axis drive gear to rotate the motor. Can be transmitted. The two-way claw clutch piece mounted on the gear support plate can rotate together with the gear support plate and can be slid in the direction orthogonal to the axis of the motor. Alternative engagement.

Two clutch engaging portions are provided at intervals in the rotation direction of the gear support plate. When the intermediate gear meshes with, for example, the X-axis drive gear, one clutch engaging portion and the two-way pawl are provided. When the rotation positions of the clutch pieces match and the gear support plate is rotated to mesh the intermediate gear with the Y-axis drive gear, the rotation positions of the other clutch engaging part and the two-way claw clutch pieces match and the two-way claw The clutch piece can be fitted in the clutch engaging portion.

When the engagement between the two-way claw clutch piece and the clutch engaging portion is released by the clutch switching means such as a solenoid, the two-way claw clutch piece meshes with the motor gear to rotate the motor forward or reversely. The two-way claw clutch piece and the gear support plate rotate, and the intermediate gear switches to the other drive gear.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 and 2 show an XY drive device 1, in which a stepping motor 3 is attached to a motor fixing plate 2 fixed to a chassis (not shown) of a serial printer. The motor fixing plate 2 has a hole 7 through which the rotary shaft 4 of the stepping motor 3, the bearing boss 5, and a gear support plate 6 described later are exposed.
Has been punched out.

A gear support plate 6 and a two-way claw clutch piece 8 are sequentially mounted on the front surface of the stepping motor 3, and an intermediate gear 9 attached to the end of the gear support plate 6 is attached to the motor fixing plate 2. It moves between the arranged X-axis drive gear 10 and Y-axis drive gear 11 and selectively meshes with one of the drive gears 10 and 11. Further, reference numeral 12 is a solenoid, which drives a shift lever 13 pivotally attached to the motor fixing plate 2 to slide the two-way claw clutch piece 8 in a direction orthogonal to the axis of the stepping motor 3.

The diameter of the center hole 14 of the gear support plate 6 shown in FIG. 3 is substantially equal to the diameter of the bearing boss 5 of the stepping motor 3, and the bearing boss 5 is freely rotatable in the left-right direction in FIG. ing. Further, as shown in FIG. 3, a lever portion 15 protruding outward from the center is provided, and a gear shaft 16 is fixedly mounted on the lever portion 15 so that the intermediate gear 9 shown in FIG. A spring support shaft 17 is provided at a position facing the gear shaft 16 with the spring support shaft 17 interposed therebetween.

As shown in FIG. 4, the two-way claw clutch piece 8 mounted on the upper surface of the gear support plate 6 has a lever portion 18 similar to the gear support plate 6 provided with an elongate hole 19 in the radial direction. Hole 1
9 is engaged with the gear shaft 16 of the gear support plate 6 so that it can slide in a certain range in a direction orthogonal to the rotation axis of the stepping motor 3. Further, the convex portions 21 and 22 projecting from the periphery of the central hole 20 toward the center are provided.
Claws 24 and 25 are formed so that the step motors 1 and 22 are bent upward and are engaged with the motor gear 23 of the stepping motor 3.
A convex portion 26 protruding outward is provided at a position facing the elongated hole 19 across the substantially oval central hole 20, and the tip end portion is bent downward to form the other pawl 27 of the two-way pawl clutch. ing. Further, the convex portions 28, 29 are provided on the left and right of the convex portion 26.
Are provided and bent upward to form spring receiving portions 30 and 31, respectively. The left and right spring receiving portions 30 and 31 also receive the pressing operation of the shift lever 13 at the rear surface portion as shown in FIG.

The gear support plate 6 described above is replaced by the motor fixing plate 2
The stepping motor 3 mounted on the gear support plate 6 is mounted on the front surface of the stepping motor 3, and then the long hole 19 of the two-way claw clutch piece 8 is engaged with the gear shaft 16 of the gear support plate 6 and mounted on the gear support plate 6. And
As shown in FIG. 1, the motor gear 23 is fitted on the rotary shaft 4 of the stepping motor 3, and the intermediate gear 9 meshing with the motor gear 23 is fitted on the gear shaft 16 of the gear support plate 6. Further, the torsion coil spring 32 is wound around the spring support shaft 17 of the gear support plate 6, and both ends 3 of the torsion coil spring 32 are wound.
3, 34 are spring receiving portions 30, 31 of the two-way pawl clutch piece 8.
Claws 24 and 25 inside the two-way claw clutch piece 8 by pressing
Urges the motor gear 23 away from the motor gear 23. The motor gear 23 uses the two-way pawl clutch piece 8 as the motor gear 23.
The claws 24 and 25 of the two-way claw clutch piece 8 are arranged so as to mesh with the gear groove when slid in the direction.

As shown in the figure, the hole 7 of the motor fixing plate 2
Two clutch engaging portions 35 and 36, into which the outer claws 27 of the two-way claw clutch piece 8 can be fitted, are provided at the lower edge portion at intervals in the rotational direction of the two-way claw clutch piece 8. .
Here, the control angle unit of the stepping motor 3 is 15
And the angular interval between the clutch engaging portions 35 and 36 is 30 degrees so that XY drive switching is performed by a 2-pulse control signal. In addition, the two clutch engagement portions 3
An arcuate guide wall 37 centered on the axis of the stepping motor 3 is formed between 5 and 36.

Next, the XY switching operation of the XY driving device 1 will be described. In the state shown in FIG. 1, the outer claw 27 of the two-way claw clutch piece 8 is engaged with the right side clutch engaging portion 36 of the motor fixing plate 2 by the bias of the torsion coil spring 32, and the inner claw 24, 25 is separated from the motor gear 23. The intermediate gear 9 of the gear support plate 6 meshes with the Y-axis drive gear 11, and when the stepping motor 3 is driven, the Y-axis drive gear 11 is rotated.

When driving the X-axis drive gear 10, when the solenoid 12 is energized and the plunger 38 is pulled, the tip end of the shift lever 13 is the spring bearing on the left side of the two-way claw clutch piece 8 as shown in FIG. The outer claw 27 is disengaged from the engaging portion 36 by pressing the portion 30 and sliding the two-way claw clutch piece 8, and the inner claws 24 and 25 are moved by the motor gear 23.
Mesh with.

Then, when a control signal of two steps in the clockwise direction is output to the stepping motor 3, the motor gear 2
The two-way pawl clutch piece 8 meshing with the gear 3 is rotated as shown in FIG.
The gear support plate 6 inserted through 6 rotates in conjunction. Further, at the same time when the control signal is output to the stepping motor 3, the output current to the solenoid 12 is turned off, the shift lever 13 is returned to the standby position, and the outer claw 27 of the two-way claw clutch piece 8 causes the two clutch engagements. It is moved while being pressed against the guide wall 37 between the joining portions 35 and 36. Then, when the outer pawl 27 reaches the position of the left clutch engaging portion 35, the two-way pawl clutch piece 8 is slid by the bias of the torsion coil spring 32, and the outer pawl 27 is moved to the clutch engaging portion 35. And the inner claws 24 and 25 are fitted to the motor gear 23.
When the intermediate gear 9 is disengaged from the X-axis drive gear 10
It becomes possible to transmit the rotation of the stepping motor 3 to the X-axis drive gear 10 by engaging with.

When switching from the X-axis drive to the Y-axis drive, the intermediate gear 9 meshes with the Y-axis drive gear 11 by reversing the rotation direction of the stepping motor 3 in the same manner as described above. FIG. 8 shows a thermal recording type time recorder 41 which is an example of a serial printer using the XY drive device 1 described above. A carriage guide shaft 43 and a Y-axis drive shaft 44 are arranged in the chassis 42 in the left-right direction. . X on the left side of the figure
The X-axis drive gear 10 of the Y drive device 1 meshes with the final gear 45, and the timing belt 48 is wound around the gear pulley 46 coaxial with the final gear 45 and the gear pulley 47 provided on the right side wall of the chassis 42. There is. Timing belt 4
Reference numeral 8 denotes a head carriage 49 which is engaged with a gear pulley 50 of a head carriage 49 loosely fitted to a carriage guide shaft 43 to transmit rotation to a driven gear 51, and the driven gear 51 rolls on a rack gear 52 fixed to a chassis 42. Four
Move 9 left and right.

The Y-axis drive gear 11 is rotated by a worm 53 coaxial with the Y-axis drive gear 11, a worm wheel 54 fitted on the carriage guide shaft 43, a gear pulley 55 coaxial with the worm wheel 54, and a timing belt 5.
It is transmitted to the Y-axis drive shaft 44 via 6. When a time card is inserted into the card insertion slot 57 provided at the top of the time recorder 41, a control unit (not shown) that detects the insertion of the card drives the Y-axis drive shaft 44 to lower the time card to a predetermined position. The head carriage 49 is moved in the X direction by switching to the X-axis drive, and the time is printed on a predetermined column. In this way, with one motor, X axis and Y
The axis is driven.

The present invention should not be limited to the above-mentioned embodiment, and various modifications can be made without departing from the spirit of the present invention. And, of course, the present invention extends to those modifications.

[0020]

As described in detail in the above embodiment, the present invention drives the X-axis and the Y-axis with one motor, so that the number of motors can be reduced as much as possible and the serial printer can be made compact. Not only is it extremely effective in reducing weight, but it can also contribute to cost reduction.

[Brief description of drawings]

FIG. 1 is a front view of an XY drive device.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a front view of a gear support plate.

FIG. 4 is a front view of a two-way claw clutch piece.

FIG. 5 is an explanatory diagram of drive switching.

FIG. 6 is an explanatory diagram of drive switching.

FIG. 7 is an explanatory diagram of drive switching.

FIG. 8 is a configuration diagram of a time recorder using an XY drive device.

[Explanation of symbols]

 1 XY Drive Device 2 Motor Fixing Plate 3 Stepping Motor 4 Rotating Shaft 6 Gear Support Plate 8 Two-way Claw Clutch Piece 9 Intermediate Gear 10 X-axis Drive Gear 11 Y-axis Drive Gear 12 Solenoid 13 Shift Lever 23 Motor Gear 24, 25, 27 Claws 35, 36 Clutch engagement part

Claims (1)

[Claims] 1. A motor gear (23) is fitted on a rotating shaft (4) of a motor (3), and a rotatable gear support plate (6) whose rotation center coincides with that of the rotating shaft (4) is provided. An intermediate gear (9) meshing with the motor gear (23) is axially mounted on the gear support plate (6), and an X-axis drive gear (10) and a Y-axis drive gear (11) are provided on the revolution path of the intermediate gear (9). A two-way claw clutch piece (8) is mounted on the gear support plate (6), and the intermediate gear (9) is meshed with the X-axis drive gear (10) or the Y-axis drive gear (11). In the above, two clutch engaging portions (35, 36) capable of engaging with the two-way claw clutch piece (8) are provided around the gear support plate (6), and a clutch switching means such as a solenoid (12) is provided. The two-way claw clutch piece (8) to the motor gear (23)
Direction and the direction of the clutch engagement portion (35, 36) are freely switchable, and the two-way claw clutch piece (8) is engaged with the motor gear (23) to rotate the motor (3). Thus, the XY drive device of the serial printer configured to rotate the gear support plate (6) to mesh the intermediate gear (9) with the X-axis drive gear (10) or the Y-axis drive gear (11).