JPS6246669A - Printer - Google Patents

Abstract

PURPOSE:To drive a paper-feeding roller and a carrier by a common motor and simplify the construction, by moving a carrier with a loop form belt fixed by a holding part on the carrier, and transmitting the rotation of a motor to a paper-feeding roller through an idler on the carrier by releasing the belt when the carrier is located at an end part. CONSTITUTION:Usually, a movable body 33 of a holding part 35 is energized by springs 36 to fix a timing belt 17 in cooperation with a fixed wall 34, and a motor 10 is driven to move the carrier 4 to a printing-starting position. When the carrier reaches a left home position, an idler gear 23 is engaged with a driving gear 12 and a gear 25, and at this position, an electromagnet 31 is excited to release a timing belt 17 from the holding part 35. When the motor 10 is further rotated counterclockwise, the rotation is transmitted to a platen 1 through a rotation-transmitting mechanism 27 and a bevel gear 21, that is, a paper is fed by the platen 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a printing device.Prior art Conventionally, a rotating body that converts rotational motion into linear motion and transmits it to a carrier, and a paper feed roller are individually connected. However, since a motor is required for each function, the device becomes larger, the cost becomes higher, and the noise becomes louder.

Some motors drive the paper feed roller and carrier with a single motor, but a clutch must be provided in each power transmission path, which complicates the structure and increases the cost.

The present invention has been made in view of the above points, and an object of the present invention is to provide a printing device in which a common motor drives a paper feed roller and a carrier, and the structure of which can be simplified.

Means for Solving the Problems In the present invention, one of a plurality of pulleys 13 and 16 for winding and holding an endless band [-7] along the moving direction of the carrier 1 is connected to a motor 10, and the carrier 4L This idler 23,2
A drive wheel 1.4 is mounted in a freely rotatable manner near the motor 10 and transmits the rotation of the motor 10 to the idler 23,24. ,．． A rotation transmission mechanism 27.30 for transmitting the rotation of L5 and the idler 23.24 to the paper feed roller 1 is provided, and a holding section 35 for selectively holding the endless band 17 is provided on the carrier 4.

Accordingly, the endless band 17 is fixed by the holding part 35 on the carrier 4, and the carrier 4 is moved by driving the motor 10. When the endless belt 17 is released from the holding part 35 and the carrier 4 is positioned at the end and the motor 10 is driven, the rotation of the motor 10 is caused by the rotation of the drive wheels 12, 15, idlers 23, 2.
4. The rotation is transmitted to the paper feed roller 1 via the rotation transmission mechanism 27.30.

Example An embodiment of the present invention will be described based on the drawings.

A carrier 4 is slidably held on carrier shafts 2 and 3 parallel to a platen 1 which also serves as a paper feed roller. The carrier 4 is formed with a guide portion 6 that guides the thermal head 5 in a direction perpendicular to the platen 1 so as to move forward and backward, and gears 8 and 9, which rotate integrally with the ribbon winding shaft 7, are in mesh with each other. It is held rotatably. On the left side of the moving direction of the carrier 4 is a motor 10 M! ! placed,
A drive gear 12, which is a drive wheel, is fitted to the rotating shaft 11 of the motor 1o so as to be slidable in the axial direction and prevented from rotating in the rotational direction, and a pulley 13 is fitted to the rotating shaft 11 so as to be freely rotatable and slidable. It is fitted. A drive gear 15 and a pulley 16, which are drive wheels, are coupled to a support shaft 14 located on the right side in the moving direction of the carrier 4, and are rotatably held therein.

Pulley 13. ] 6 has an endless belt timing bell 1-
17 is wound. The drive gear 12 is urged upward from the spring 18 as shown in FIG. 20
It is prevented from coming out.

Next, bevel gears 21 and 22 are installed at both ends of the platen 1.
is fixed. Idler gears 23 and 24, which are idlers meshed with the drive gear 12 or 15, are freely rotatably held on both sides of the carrier 4. Furthermore, when the carrier 4 is located at the left end, the idler gear 23
A rotation transmission mechanism 27 is provided which includes a gear 25 that meshes with the gear 25 and a bevel gear 26 that transmits the rotation of the gear 25 to the bevel gear 21. Similarly, when the carrier 4 is located at the right end, a gear 28 that meshes with the idler gear 24 and a bevel gear 26 that transmits the rotation of the gear 25 to the bevel gear 21 are provided. gear 2
A rotation transmission mechanism 30 is provided which includes a bevel gear 29 that transmits the rotation of 8 to the bevel gear 22.

Further, the carrier 4 is provided with a holding part 35 that holds the timing belt 17 between a movable body 33 fixed to the plunger 32 of the electromagnet 31 and a fixed wall 34.
3 is urged toward the fixed wall 34 by a spring 36. The front surface of the movable body 33 has projections and depressions that engage with projections and depressions formed on the inner surface of the timing belt 17.

Further, the carrier 4 rotatably holds a cam 40 having two concentric annular grooves 37 and 38 and a spiral groove 39 connecting these annular grooves. Force t1 follower 4 whose one end engages the annular groove 37, 38 and the spiral groove 39
The other end of the force 11 is fixed to the thermal head 5, and the force 11 follower 41 is biased by balance springs 4, 43 from opposite directions on a straight line orthogonal to the platen 1. When the forces of these balance springs 4 and 43 are balanced, it is a force! , when the follower 41 is located in the middle of its movement range. That is, when the thermal head 5 is advancing toward the platen 1, the force 11 is urged in the direction away from the platen 1, and when the thermal head 5 is moving away from the platen 1, the force 11 is applied to the follower 41. 41 is biased toward the platen 1.

Furthermore, the carrier 4 has a gear 44 that is always engaged with the gear 9.
is rotatably held, and a switching lever 45 that rotates about the center of this gear 44 as a fulcrum is biased counterclockwise by a spring 46.

The tip of the switching lever 45 is in contact with the thermal head 5. A part of the timing belt 17, that is, a holding part;
Non-fixed side 48&,' which is not fixed by 35: The gear 47 to be attached is rotatably held by the switching collar 45 and tightly meshed with the gear 411.

Furthermore, the holding part 35 of the timing bell 1-17
) A gear 50 rotates in contact with a fixed side 49 fixed at
is rotatably attached to carrier 1, and this gear 50
At the tip of the link 51 rotatably held at the center of the
In the structure shown in Fig. 2 in which a gear 52 is rotatably supported, which is always engaged with the gear 50 and selectively engaged with the gear 8, the movable body 323 is normally connected to the spring 3.
The timing bell 1-17 is fixed together with the VC fixing wall 31 biased to 6. In this state, drive the motor 10 once to move the carrier 4 to the printing start position. When the gear rear 4 reaches the printing position I, the motor 10 is stopped, the electromagnet 31 is energized, the movable body 33 is retracted, and the timing belt 17 is released. )
As shown in FIG.
When Chi-Yu 10 is rotated clockwise from the state in which it is engaged, the bell 40 is moved by the conveying force of the timing bell L-17.
), the force 11 follower 41 is guided by the force of the stretched balance spring 42 to the spiral groove 39, moves to the outer annular groove 38, and advances the thermal head 5 toward the platen 1. do. In this state, the balance spring 42 is contracted and the balance spring 43 is stretched, but the force 11 follower 41 will not return as long as the force 1140 is rotating clockwise. The ring ') 51 rotates clockwise to separate the gear 52 from the gear 8! Zeru.

In this way, when the thermal head 5 advances to the platen 1, the number -switching L collar 45 moves to the spring 4 as shown in FIG.
Rotate counterclockwise around the center of the gear 44 as a fulcrum by the force of G, and bring the gear 47 into elastic contact with the timing belt i-7. In the state shown in FIG. 2, the electromagnet 31 is de-energized and the timing bell is activated by the movable body 333 and the fixed wall 34]
-17 is held, the motor 10 is rotated in the direction of force at Jt,
Move carrier 1 in the 71 direction and print. , : When the fixed side 4 of the timing bells 1 and 17 is held by the holding part 35
Since 9 does not have a relative displacement U in gear 1, the force/
, % 40, the gear 50 does not rotate, but in the evening, the non-fixed side 4ε3 of the timing bell 17 moves toward the carrier 4 and moves relatively to the left, so the gear 47 is rotated in the direction 1.

The rotation of this gear 47 is transmitted to gears 44, 9.8,
The ribbon winding shaft 7 rotates counterclockwise to take up the ribbon (not shown) drawn out to the platen L.
Wind it onto the spool (l) of I17-L (not shown).

In this way, when the printing of the - line is finished, the motor 10 is stopped, the carrier 1 is held still, and the 'l'l! magnet 7
31 is energized to release the timing bell 1-17 from the holding part 35, and in this state, when the motor 10 is rotated counterclockwise, one side of the timing bell I-1-7 on the platen 1- side is turned to the other side. Move and rotate the force 1X40 and the gear 50 counterclockwise. As shown in FIG. 5(a), the force 11 follower 41 is biased toward the middle part of the movable horn cropping range by the counterbalance spring 43, so that only when the force 11 rotates counterclockwise does it spiral. The inner annular groove 3 is guided by the groove 39.
Move to 7. That is, the thermal spatula 1z5 is retracted from the platen 1. Due to this retracting operation, the switching lever 45
Gari - Pushed by the round head 5 and rotated clockwise! Move the lj shifter 47 away from the non-fixed side 48 of the timing bell 1-17.

Next, the electromagnet 31 is de-energized, the timing belt 17 is held by the holding part 35, and the motor 10 is rotated counterclockwise to move the carrier 1 to the left. At this time, the fixed side 49 of the timing bell 1-17 is connected to the carrier 4.
Since it does not move relative to the force 1x40. gear 50
does not rotate. When the carrier reaches the left ho 11 position, the idler gear 23 is connected to the drive gear 12 and the gear 25.
Meshing 1. At the second position, the electromagnet 31 is excited and the holding part 35 is
The timing belt 17 is released from the motor 10 and the timing belt 17 is released from the
When rotated counterclockwise, this rotation is transmitted to the platen 1 via the rotation transmission mechanism 27 and the bevel gear 21. That is, the platen 1 advances the paper. career 4
When the motor 1o is rotated counterclockwise while the timing bell 1-17 is held between the holding parts 31, the idler gear 23 meshes with the gears 1 and 25, and the carrier 4 is moved to the left. However, when the motor 10 is rotated counterclockwise in this state, the felt 19 slips and the rotating shaft 11 and drive gear 12 rotate, but the pulley 13
stops.

Further, as shown in FIG. 3, when the timing belt 17 is released from the holding part 35, the thermal head 5 is retracted from the platen 1, and the gear 47 is retracted from the non-fixed side 48 of the timing belt 17, the motor 10 is rotated counterclockwise at high speed 1, the platen 1 side of the timing bell 1-17 is moved to the left, the gear 50 is rotated counterclockwise, and the link 51 is rotated counterclockwise by the frictional force with the gear 50. The ribbon winding shaft 7 can be rotated in the counterclockwise direction by rotating the gear 52 in the direction shown in FIG.

Therefore, if the ribbon is a certain length and is divided into multiple colors, with the carrier 4 positioned at the printing position, the ribbon is emptied at high speed until the desired color is pulled out in front of the platen 1. can be sent.

Further, when the paper is to be fed backwards, the carrier 4 is moved to the right and the idler gear 24 is brought into mesh with the drive gear 15 and the gear 28. When the motor 10 is rotated counterclockwise in this state, this rotation is caused by the timing belt 17. The rotation is transmitted to the bevel gear 22 via the pulley 16, drive gear 15, idler gear 241 and rotation transmission mechanism 29, and the platen 1 feeds the paper in the opposite direction.

Effects of the Invention Since the present invention is constructed as described above, it is possible to drive the paper feed roller and the carrier with one motor, and when driving the paper feed roller, the carrier is positioned at the end and the endless band is moved. Release it from the holding part on the carrier and drive the motor rotation! The rotation can be transmitted to the paper feed roller via IJ4+1&, the idler on the carrier, and the rotation transmission mechanism. Therefore, there is no need to provide a clutch between the carrier drive system and the paper feed roller drive system, simplifying the structure and reducing costs. It has the effect of being able to aim for down.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view showing a state in which the thermal head is retracted; FIG. 2 is a plan view showing the process of printing by advancing the thermal head;
Fig. 3 is a plan view showing a state in which the ribbon is being fed idly, Fig. 4 is a side view showing the connection structure of the motor, drive gear, and pulley, and Fig. 5 is a plan view showing an enlarged view of the operation of the cam and cam follower. be. 1...Platen (paper feed roller), 4...Carrier, 10...Motor, 12...Drive gear (drive shaft),
13... Pulley, 15... Drive gear (drive shaft), 1
6...Boo 1c 17...Timing belt (endless belt), 19...Felt (torque limiter), 23.
24...Idler gear (idler), 27.30...
・Rotation transmission mechanism, 35...holding part

Claims (1)

[Claims] 1. One of a plurality of pulleys winding and holding an endless band along the moving direction of the carrier is connected to a motor, an idler is attached to the carrier so as to be freely rotatable, and an idler is installed in the vicinity of the motor. A drive wheel for transmitting the rotation of the motor to the idler and a rotation transmission mechanism for transmitting the rotation of the idler to the paper feed roller are provided, and a holding part for selectively holding the endless band is provided in the carrier. A printing device featuring: 2. The printing device according to claim 1, characterized in that a torque limiter is interposed between the motor and the pulley.