JPH0120132Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording device equipped with a writing member such as a thermal head, and more particularly to a paper feeding mechanism that transports recording paper in conjunction with the movement of the writing member.

[Conventional Problems] In a recording device equipped with a writing member such as a thermal head, a paper feeding operation is performed in response to the movement of the writing member. However, in the conventional paper feeding mechanism, the paper feeding roller is driven using the return stroke after one line printing operation by the writing member.
Therefore, it is not possible to feed the paper for one line unless the writing member is returned to full stroke, so the processing time is increased by the amount of time the writing member is returned, and even if the next line is printed from an intermediate digit, the paper cannot be fed by one line. The inserted part must be completely returned to its original position. Further, there is a drawback that even if an attempt is made to change the feed pitch of the recording paper depending on the type of recording operation, it cannot be changed freely.

[Purpose of this invention]

The present invention was developed by focusing on the above-mentioned conventional problems, and is a recording device that allows paper feeding to be performed in a short period of time during the movement stroke of the writing member, and also allows the paper feeding pitch to be changed. The purpose is to provide a paper feeding mechanism for the device.

The paper feed mechanism of the recording device according to the present invention includes a rotating body that rotates with the movement of the writing member, and partial teeth are provided around the rotating body, so that the writing member reaches a predetermined position beyond the printing operation range. When the writing member reaches the position, the partial teeth are engaged with the paper feed gear, and when the writing member is moved in the opposite direction, the paper feed gear is rotated and the paper feed roller is driven. The paper feed pitch is set by changing the number of meshing teeth between the partial teeth and the paper feed gear depending on the amount of movement.

Embodiments of the present invention will be described below with reference to the drawings.

[Overall schematic configuration]

FIG. 1 is a plan view showing a recording apparatus according to the present invention. This recording device is equipped with a graphic/printing mechanism using a thermal head and a printing mechanism using a rotating type belt.

Reference numeral 1 in the figure is a base, and on the base 1, a left side plate 2 and a right side plate 3 are installed in parallel. A platen mechanism 4 is installed between the left side plate 2 and the right side plate 3.
A paper feed roller R is also provided so that the recording paper can be sequentially fed out and held in the direction toward the front of the paper in FIG. Platen mechanism 4
A thermal head SH and its driving mechanism are provided facing each other. Thermal head SH
is the pulse motor Ma fixed to the left side plate 2.
, and moves along the platen mechanism 4. The drive mechanism of the thermal head SH is linked to the paper feed roller R, and the paper feed roller R is rotated by a predetermined angle when the thermal head SH moves to the right end in FIG.

Further, a type belt B is rotatably provided in front of the platen mechanism 4 (lower side in the figure). On the outer peripheral surface of the type belt B, type bodies Ba for printing numbers, symbols, etc. are arranged. This type belt B is rotationally driven by the power of a DC motor Mb fixed to the right side plate 3. Also, a hammer mechanism 5 is provided within the periphery of the type belt B.
is provided. The driving force of the DC motor Mb is provided by a solenoid S provided on the right side of the base 1.
The excitation timing is transmitted to the hammer mechanism 5, and by moving the hammer mechanism 5 to the right in the drawing, carrying and pressurizing the print body Ba against the recording paper are performed.

In this recording device, a thermal head SH performs a graphic operation, and a type mechanism mainly performs a printing operation of numbers, symbols, etc.

[Configuration of Platen Mechanism] Details of the platen mechanism 4 are mainly shown in a part of FIG. 2 and in each of the figures from FIG. 9 to FIG. 11.

A platen 11 that supports the back surface of the recording paper 6 is formed into a flat plate shape from a slightly elastic material such as rubber or synthetic resin. Further, the platen 11 is fixed to the front surface of the support member 12. This support member 12 is made of sheet metal with a cross section L
It is shaped like a letter. Support member 1
Attachment pieces 12a are bent at right angles at both ends in the longitudinal direction of 2, and the support shaft 13 is inserted through these attachment pieces 12a. Both ends of the support shaft 13 are supported by the left side plate 2 and right side plate 3. As shown in Figure 2, the left side plate 2 has a long hole 2.
a is formed into which the left end portion of the support shaft 13 is inserted. This long hole 2a is the base 1
The platen 11 is guided toward and away from the thermal head SH and the type belt B. A cap 14 is fitted onto the end of the support shaft 13 to prevent the support shaft 13 from coming off. Also, left side plate 2
A pin 15 is fixed to the outer surface of the holder, and a spring 16 is mounted on the pin 15. This spring 16
One arm 16a of the cap is hung on the cap 14, and the other arm 16b is hung on the support hole 2b on the left side plate 2 (see FIGS. 2 and 9). The support shaft 13 is attached to the thermal head by the elastic force of the spring 16.
Always biased in the direction of SH.

Further, as shown in FIGS. 10 and 11, guides 17, 18, and 19 are provided on the base 1, and a supply path for the recording paper 6 is formed by these guides 17, 18, and 19. has been done. Also,
An auxiliary plate 21 having an L-shaped cross section is fixed to the upper part of the guide 19. Upper end bent portion 21a of auxiliary plate 21
A gap is formed between the support member 12 and the upper surface of the guide 19, and the lower end bent portion 12b of the support member 12 is interposed within this gap. The support member 12 is rotatably supported by the support shaft 13, but by limiting the vertical movement range of the lower end bent portion 12b, this rotation angle is regulated within a certain angle. It is something that exists.

Note that the paper feed roller R and the pinch roller R that presses against it are located between the upper and lower guides 17 and 19.

Further, the right end of the support shaft 13 is supported by the right side plate 3, and the support mechanism on the right side plate 3 is almost the same as the support mechanism on the left side plate 2.

In the above mechanism, the recording paper 6 is placed in the guide 1
7, 18, and 19, and is sandwiched between a paper feed roller R and a pinch roller R, and is installed in front of the platen 11. During the recording operation, the thermal head SH comes into pressure contact with the platen 11 via the recording paper 6;
1 and the support member 12 rotate by a predetermined angle around the support shaft 13, so that the platen 11 follows the opposing angle of the thermal head SH, so that the entire surface of the thermal head SH is always pressed uniformly against the recording paper 6. become. Further, when the thickness of the recording paper 6 changes, the platen 11 and the support member 12 move back together with the support shaft 13 against the elastic force of the spring 16, causing the platen 11 and the thermal head to move backward.
Changes in the thickness of the recording paper 6 held between the sheets SH are absorbed, and the pressing force of the thermal head SH is adjusted.

[Configuration of thermal head movement mechanism and paper feeding mechanism]

The configuration of the thermal head moving mechanism and paper feeding mechanism is shown in Figures 2, 3, and 4A to 4.
It is shown in Figure D.

As shown in FIG. 2, the thermal head SH is held by a carriage 30. The carriage 30 is molded of resin or the like, and is mounted on a head guide shaft 31 extending between the side plates 2 and 3 so as to be able to slide in the direction of the arrow. A support piece 3 is attached to the upper end of the carriage 30.
0a is provided in a protruding manner, and a thermal head SH is held on the front surface of this support piece 30a. The thermal head SH has flexible lead 32 (11th
(see figure) to the external circuit. A guide groove 33 is formed on the upper surface of the carriage 30. This guide groove 33 has a narrow portion 3 on the right side in the figure.
3a, the left side is the wide part 33b, both parts 33a,
A guide slope 33c is formed in the middle of 33b. Then, a pressurizing tip 3 is inserted into this guide groove 33.
4 is intervening. This pressurizing tip 34 is formed of resin or the like into a hexahedral shape, and a wire 35 for pulling the carriage 30 is connected thereto. Further, a projection 34 is provided on the upper surface of the pressure tip 34.
a is provided integrally. On the other hand, as shown in FIGS. 3 and 11, a head guide plate 36 is placed at a position facing the platen 11 at a predetermined interval.
is permanently installed. The head guide plate 36 is made of sheet metal and is formed into an L-shaped cross section. The center of the head guide plate 36 and the platen 1
1 is narrower, and when the carriage 30 moves into this area, the pressurizing tip 34 is pinched at the center of the head guide plate 36.
This pressure causes the thermal head SH on the carriage 30 to come into pressure contact with the recording paper 6 on the front side of the platen 11. Furthermore, recesses 36a and 36b are provided at the left and right ends of the head guide plate 36.
is formed, and the carriage 30 is inserted into this recess 3.
When reaching portions 6a and 36b, the pressure on the pressurizing chip 34 is removed, and the thermal head SH is separated from the recording paper 6, making it easier to feed the paper.

The wire 3 connected to the pressure tip 34
5 is hung on a pair of idle pulleys 37a and 37b supported by the left side plate 2. Further, although not shown, another idle pulley is provided on the right side plate 3, and the wire 35 extending from the right side of the pressure tip 34 is wound around this idle pulley and reaches the idle pulley 37b. In addition, a bobbin 40 is rotatably supported on the left side.
A wire 35 is wound around this bobbin 40 and fixed. A gear 40a is integrally formed at the base of the bobbin 40, and a pinion 41 of the pulse motor Ma is meshed with this gear 40a. Further, an intermediate gear 42 is provided on the side of the bobbin 40. This intermediate gear 42 is connected to the left side plate 2
It is rotatably supported on a shaft 43 fixedly attached to the shaft 43. Continuous teeth 42a are provided around the entire circumference of this intermediate gear 42,
Partial teeth 42b are formed parallel to the continuous teeth 42a. Three partial teeth 42b are provided, and the portion where the partial teeth 42b are not provided becomes a smooth portion 42c. Further, as shown in FIG. 4A and subsequent figures, a groove 4 is formed at the boundary between one side (upper side in FIG. 4A) of the partial tooth 42b and the smooth portion 42c.
2d is formed. This groove 42d is the smooth part 4
It is shaped more concavely toward the center than 2c. A gear 40b is integrally provided at the tip of the bobbin 40, and this gear 40b meshes with continuous teeth 42a of the intermediate gear 42.

On the other hand, a friction body Rb made of rubber or the like is fitted around the paper feed roller R. Further, the paper feed roller R is fixed to the drive shaft 44 (first
(see Figure 10). One end of this drive shaft 44 protrudes from the left side plate 2 (see FIG. 2), and a paper feed gear 45 is provided at the tip of this drive shaft 44. This paper feed gear 45 is rotatable relative to the drive shaft 44. Teeth 45a are continuously formed around the paper feed gear 45, and a protrusion 45b is provided on a part of the teeth 45a.
The teeth 45a mesh with the partial teeth 42b on the intermediate gear 42. Also, the tip surface 45 of the protrusion 45b
c is a concave curved surface. This tip surface 45c
The curvature of corresponds to the curvature of the smooth portion 42c of the intermediate gear 42, and when the tip surface 45c of the protrusion 45b is in contact with the smooth portion 42c as shown in FIG. The portion 42c slides on the distal end surface 45c, so that the rotational force of the intermediate gear 42 is not transmitted to the paper feed gear 45. In addition, in the state shown in FIG. 4D, the tip surface 45c
Since the concave curved surface of is aligned with the smooth portion 42c,
The paper feed gear 45 cannot rotate independently. Further, as shown in FIG. 2, the drive shaft 44 is provided with a ratchet 46a. The ratchet 46a is integrated with the paper feed gear 45 through a sleeve 45d.
6a and the paper feed gear 45 are adapted to rotate together with respect to the drive shaft 44. Further, another ratchet 46b is slidably attached to a position closer to the left side plate 2 by spline engagement. A spring 47 is interposed between the ratchet 46b and the left side plate 2, and the elastic force of the spring 47 brings the ratchet 46b into pressure contact with the ratchet 46a. The engagement of both ratchets 46a and 46b allows power to be transmitted in only one direction. That is, when the paper feed gear 45 rotates in the C direction, this power is not transmitted to the ratchet 46b and the drive shaft 44, and when the paper feed gear 45 rotates in the two directions, both ratchets 46a 46b mesh with each other, and the rotational force of the paper feed gear 45 is applied to the ratchet 46b.
It is also transmitted to the drive shaft 44 and further to the paper feed roller R.

[Configuration of printing mechanism using type belt]

The details of the configuration of the printing mechanism using the type belt are shown in FIG. 1 and FIGS. 5 to 7.

As shown in FIG. 1, the type belt B is hung between a driving pulley 51 and a driven pulley 52 provided on both sides of the base 1. Further, a pinion 53 is fixed to the drive shaft of the DC motor Mb attached to the right side plate 3, and the power of this pinion 53 is transmitted to intermediate gears 54a, 54b, 5
4c and further to the drive pulley 51 via a clutch (not shown). The type belt B is rotationally driven in the direction of arrow H (see FIG. 5) by the clockwise rotation of the drive pulley 51. Therefore, the side of the type belt B facing the platen mechanism 4 is the tension side.

Also, on the base are a carry shaft 55 and a guide shaft 5.
6 are arranged in parallel. The carry shaft 55 is rotatable, and the guide shaft 56 is fixed. A bevel gear 57 is fixed to the right end of the carry shaft 55 in FIG.
It meshes with a. This bevel gear 51a and drive pulley 51 are also connected by a clutch.
Further, these clutches are adapted to be switched by a switching lever 58. This switching lever 58 operates according to the excitation timing of the solenoid S. That is, the drive pulley 51
rotates, and a predetermined type body Ba on type belt B
When the solenoid S reaches the printing position,
is excited, and the switching lever 58 operates. As a result, the predetermined type body Ba stops at the printing position, and rotational force is transmitted to the carry shaft 55.
5 rotates once, and the hammer mechanism 5 is activated.

Next, the configuration of the hammer mechanism 5 will be explained.

The hammer mechanism 5 is provided in a hammer carriage 60 shown in FIG. Hammer carriage 6
0 moves along the carry shaft 55 and the guide shaft 56 in the direction of the arrow mark (see FIG. 5). A spring hook 60a is integrally formed on the left side surface of the hammer carriage 60, and a tip hook of a return spring 61 is hooked onto this spring hook 60a. As shown in FIG. 1, this return spring 61 is stretched in a U-shape on the base 1, and the hammer carriage 60 is always biased in the direction of arrow T by this return spring 61. A type guide 60b is provided on the front side of the hammer cartridge 60, that is, the portion facing the recording paper 6.
The type belt B is interposed within this type guide 60b. A window 60c is provided in the center of the type guide 60b, and a printing operation is performed when a predetermined type body Ba to be printed reaches the position of this window 60c.

FIG. 7 shows the structure of the hammer mechanism 5 within the hammer carriage 60. Hammer carriage 6
A hammer 62 is provided inside the 0. Hammer 6
The front end of the hammer 62 faces the type belt B, and a spring 63 is applied to the rear end of the hammer 62, and the elastic force of the spring 63 causes the hammer 62 to press against the recording paper 6.
is biased in the direction of retreating from the Further, a rotating body 64 is provided within the hammer carriage 60. The rotary body 64 is in spline engagement with the carry shaft 55 and rotates together with the carry shaft 55. A screw 64a is integrally formed around the rotating body 64. On the other hand, a carry shaft 55 and a rack shaft 65 parallel to the guide shaft 56 are provided on the base 1.
Rack 65a formed on this rack shaft 65 at predetermined intervals is opposed to the position where it engages with the screw 64a. Additionally, a cam 64 is attached to the rotating body 64.
b is integrally formed, and this cam 64b faces the rear slope 62a of the hammer 62.

The rack shaft 65 is held stationary by the biasing force of a spring (not shown) in the direction shown in FIG. 7, that is, in the direction in which the rack 65a can engage with the screw 64a. Further, as shown in FIG. 6, a partial screw 65b is provided at the right end of the rack shaft 65 (the portion located on the right side in FIG. 1). On the other hand, a protrusion 34a formed on the upper surface of the pressurizing chip 34 that drives the carriage 30 for the thermal head SH is opposed to the partial screw 65b. When the pressurizing tip 34 (as well as the carriage 30) is pulled by the wire 35 and moves in the direction of arrow A, the pressurizing tip 3
The protrusion 34a on the top 4 abuts against the partial screw 65b. Then, the rack shaft 65 rotates in the direction of arrow H due to the pressing force of the protrusion 34a against the partial screw 65b, and the rack 65a comes to be disengaged from the screw 64a of the rotating body 64. When the rack 65a is disengaged from the screw 64a, the hammer carriage 60 returns in the direction of the arrow T by the force of the return spring 61. In addition, pressure tip 3
When the protrusion 34a of No. 4 separates from the partial screw 65b, the rack shaft 65 returns to its original position by the force of a spring (not shown), and the rack 65a moves back onto the screw 64.
It is arranged to face the position where it engages with a.

Next, the operation of the recording apparatus with the above configuration will be explained.

[Thermal head movement and paper feeding operation]

The movement of the thermal head and the paper feeding operation are performed by the 4th A.
4D and FIGS. 12A and 12B.

In FIG. 2, when the pulse motor Ma is rotationally driven, the power is transferred from the pinion 41 to the gear 40.
a, and the bobbin 40 rotates. This rotational action applies tension to the wire 35 and transmits power to the pressurizing tip 34. When the pressurizing tip 34 is pulled in the direction of arrow A due to the rotation of the bobbin 40, the pressurizing tip 34 intervenes in the narrow portion 33a of the guide groove 33 on the carriage 30. and,
The moving force of the pressurizing tip 34 is transmitted to the carriage 30, and the pressurizing tip 34 is compressed within the narrow space W between the narrow portion 33a and the head guide plate 36. As a result, the carriage 30 moves in the A direction, and during this time, the thermal head SH on the carriage 30 comes into pressure contact with the recording paper 6 on the front side of the platen 11 due to the squeezing force of the pressure chip 34, and a printing operation is performed. It will be done. On the other hand, when the bobbin 40 is reversed and the pressurizing tip 34 moves in the direction of the arrow B, the pressurizing tip 34 touches the wide part 33 of the guide groove 33.
b, the pressure on the thermal head SH by the pressure chip 34 is released, and the pressure chip 3
The return force of 4 is transmitted to the carriage 30. and,
The return operation of the carriage 30 in the direction A is performed smoothly.

In addition, as shown in FIG. 3, the head guide plate 3
Since recesses 36a and 36b are formed at both ends of the thermal head 6, when the pressure chip 34 is located in the recess 36a or 36b, the pressure chip 34 is not compressed and the thermal head SH records no data. No pressing force is applied to the paper 6.

Further, the rotation of the bobbin 40 for moving the carriage 30 is transmitted from the gear 40b to the continuous teeth 42a of the intermediate gear 42 meshing with the gear 40b. When the bobbin 40 rotates clockwise in FIG. 4A, the carriage 30 performs a printing operation in the direction A, and the intermediate gear 42 rotates counterclockwise. Conversely, when the bobbin 40 rotates counterclockwise, the carriage 30 returns to the direction B, and the intermediate gear 42
rotates clockwise. In this way, the operation of the carriage 30 and the operation of the intermediate gear 42 are linked. As shown in FIG. 4A, when the partial tooth 42b is located above the protrusion 45b of the paper feed gear 45,
The pressure tip 34 on the carriage 30 is the 12th A
12B. 4th A
When the intermediate gear 42 rotates counterclockwise from the state shown in the figure and the partial tooth 42b reaches the lower side of the protrusion 45b, that is, in the state shown in FIG. 4D, the pressure tip 34 moves as shown in FIGS. It is in the position in Figure 12B. The section after this (the section shown in FIGS. 12A and 12B) is the printing operation range by the thermal head SH and the type belt B. Next, when the intermediate gear 42 further rotates counterclockwise from the state shown in FIG.
This corresponds to b. This state is shown in FIG. 4B, and at this time, the pressure tip 34 is
It is located at the position in Figure B. Further, when the intermediate gear 42 is rotated counterclockwise, the partial tooth 42b and the tooth 45a of the paper feed gear 45 are engaged with each other, and the paper feed gear 45 is rotated clockwise. When the bobbin 40 and the intermediate gear 42 are rotated until the partial tooth 42b and the tooth 45a are engaged by about two teeth as shown in FIG. 4C, the pressure tip 34 is moved to the position shown in FIGS. 12A and 12B. Moving. Further, the pressure tip 34 does not reach the state shown in FIG. 4C, but moves to the position shown in FIGS. 12A and 12B in a state where the partial teeth 42b and the teeth 45a are engaged by about one tooth.

When the pressure tip 34 moves to or from the position and the paper feed gear 45 rotates clockwise (in the direction of arrow C), the second
The ratchets 46a and 46b shown in the figure idle,
The drive shaft 44 and paper feed roller R do not rotate. Conversely, as shown in FIG. 4C, the partial tooth 42b and the tooth 45
a is meshed with approximately 2 teeth (Fig. 12A, 12
The pulse motor Ma is reversed from the state in which the pressure tip 34 is located at (in Figure B) or the state in which the partial tooth 42b and the tooth 45a are engaged by about one tooth (the state in which the pressure tip 34 is located at ), and the bobbin 40 is rotated. When rotated counterclockwise, the carriage 3
0 moves in the direction of arrow B, and the intermediate gear 42 rotates clockwise. While the pressurizing tip 34 moves to the position (while in the state shown in FIG. 4B) by this operation,
The paper feed gear 45, which has been engaged by about one tooth or about two teeth, rotates counterclockwise (in the direction of arrow 2). At this time, the ratchets 46a and 46b are engaged, the drive shaft 44 and the paper feed roller R are rotated counterclockwise, and the recording paper 6 is sent upward.
While the pressure tip 34 reaches the position from the position shown in FIG. 12A (the gear relationship is in the state shown in FIG. 4B) (the gear relationship is in the position shown in FIG. 4D), the tip surface of the protrusion 45b of the paper feed gear 45 45c reaches a state where it completely slides into contact with the smooth portion 42c of the intermediate gear 42. Note that since the intermediate gear 42 is provided with the groove 42d, the protrusion 45b does not come into contact with the smooth portion 42c while the intermediate gear 42 rotates clockwise.

As mentioned above, when the pressurizing tip 34 is moved in the direction A and moved to the position A and returned to the position or the position shown in FIG. 12A and FIG. Due to the meshing, the paper feed gear 45 rotates by a relatively large angle, and the feeding pitch of the recording paper 6 becomes longer. Also, when the pressure tip 34 is moved to the position and then returned to the position, the partial tooth 42b
Due to the engagement of the teeth 45a by one tooth, the paper feed gear 45 rotates by a small angle, and the feed pitch of the recording paper 6 becomes shorter. FIG. 8A shows a case where the feeding pitch of the recording paper 6 is a small value α (when the pressure tip 34 is moved). This feed pitch α is optimal for graphics using the thermal head SH, and a continuous line is drawn in the vertical direction of the paper. Further, FIG. 8B shows the case where the feed pitch of the recording paper 6 is a large value β (the case where the pressure tip 34 has been moved). When the feed pitch is β, the line spacing is wide, so it is suitable for printing characters and symbols using the type belt B.

Further, while the intermediate gear 42 rotates counterclockwise from the position shown in Fig. 4A and reaches the position shown in Fig. 4D, it conversely rotates clockwise from the position shown in Fig. 4D and reaches the position shown in Fig. 4A. In other words, while the pressure tip 34 is moving within the range shown in FIGS. 4
It is in sliding contact with 2c. Therefore, during this time, the paper feed gear 45 does not rotate, so the paper feed roller R also does not rotate, and the recording paper 6 is not fed. Also, during this time, if the recording paper 6 held between the paper feed roller R and the pinch roller R is forcibly pulled upwards and a rotational force is applied to the paper feed roller R, this force is transferred from the drive shaft 44 to the ratchet. 46
It is transmitted to the paper feed gear 45 via a and 46b. However, during this time, the protrusion 45 of the paper feed gear 45
Since the distal end surface 45c of b is in sliding contact with the smooth portion 52c at the same curvature, the paper feed gear 45 cannot be rotated independently, so even if the recording paper 6 is pulled by mistake, the paper feed roller R is immovable and cannot be pulled out.

[Printing operation using thermal head]

When performing printing using a thermal head,
As shown by the chain line in FIG. 12B, the pressure tip 34 is first moved to the left of the position. After setting the recording paper 6, the pulse motor Ma is driven to rotate the bobbin 40 and move the pressure tip 34 in the direction of arrow A. As explained in FIG. 3, during this movement, the pressure tip 34 intervenes in the narrow part 33a of the guide groove 33 on the carriage 30 and is pressed by the head guide plate 36, so that the thermal head SH is Recording paper 6
The carriage 30 also moves in the same direction. Then, dot-shaped recording is performed by generating heat at the heating point of the thermal head SH.
The recording paper 6 may be thermal paper, or a method may be adopted in which an ink ribbon is interposed between the recording paper 6 and the thermal head SH to thermally transfer ink to the paper.

After the pressure tip 34 has moved to the position, if the current recording operation is a graphic operation, the pressure tip 34 is further moved to the position, and then the pulse motor Ma is reversed to move the pressure tip 34 to the position. Return 34 to direction B. While the pressure tip 34 returns from the position , the paper feed roller R rotates due to the mechanical operation described above, and the recording paper 6 moves upward by the pitch α (see FIG. 8A). Therefore, the thermal head can be replaced at short intervals.
The lines drawn by SH will be continuous vertically. Thereafter, the pressurizing tip 34 is returned to the left position and the graphic operation for the next line is performed again.

In addition, if the current operation is printing a symbol or the like using the thermal head SH, the pressure tip 34
Move from position to position. While the pressure tip 34 is returned to this position, the paper feed roller R rotates and the recording paper 6 moves upward by a pitch β (see FIG. 8B). Therefore, line breaks are performed at wide intervals. after that,
The pressure tip 34 is returned to the left position, and the pressure tip 34 is again moved in the A direction to perform a printing operation.

It should be noted that while the pressure tip 34 is moving from one side to the other, the pressure tip 34 is located in the recess 36b (see Fig. 3) on the right side of the head guide plate 36, so the thermal head SH does not touch the recording paper. 6 is not pressed. Therefore, the paper feeding operation is performed smoothly.

[Printing operation using type belt]

When printing with the type belt B, first start the pulse motor Ma and pressurize the tip 3.
4 between the positions. By moving the pressure tip 34 between the two, the thermal head SH moves out of the printing range. At this time, as shown in FIG. 4D, the paper feed gear 45
It is necessary to maintain a state in which the tip end surface 45c of the protrusion 45b comes into contact with the smooth portion 42c of the intermediate gear 42, so that the paper feed gear 45 cannot rotate and the recording paper 6 cannot be pulled out. In this state, printing is performed using the type belt B.

First, the hammer carriage 60 is stopped at a position slightly to the left of the first digit. dc motor
When Mb is rotated and the drive pulley 51 is rotated,
The type belt B moves in the direction of arrow H (see FIG. 5). A reference detection section is provided on the type belt B, and this detection section counts timing pulses after passing over a detector (not shown) to determine the type body Ba to be printed. The location is now known. By this count control, when it is detected that the type body Ba of the character to be printed has reached the printing position of the first digit, the solenoid S is energized. As a result, the drive pulley 51
is temporarily stopped, and at the same time power is transmitted to the carry shaft 55, causing the carry shaft 55 to rotate once. The rotation of the carry shaft 55 is transmitted to a rotating body 64 shown in FIG.
At the beginning of one rotation of the rotating body 64, the engagement between the screw 64a and the rack 65a around the rotary body 64 causes the hammer carriage 60 to move by one digit in the direction of the arrow to reach the printing position of the first digit. In the latter half of the rotation of the rotating body 64, the cam 64b engages the hammer 6.
By pressing the rear slope 62a of 2, the type body Ba is pushed by the hammer 62, and predetermined printing is performed on the recording paper 6 using the ink adhering to the type body Ba. Note that the ink is applied to the ink-impregnated roller 71 shown in FIG.
The type body Ba on the type belt B is supplied from the type body B to the type body Ba on the type belt B. This operation is repeated to print one line. When one line of printing is completed and the hammer carriage 60 reaches the vicinity of , the pulse motor
Ma is rotated, and the pressurizing tip 34 is moved to a certain position by the wire 35, and then returned again between the two positions. As a result of this operation, the paper feed gear 45 rotates and the paper feed roller R is driven in the same manner as described above, and the recording paper 6 is moved upward by the pitch β (see Figure 8B), and the next line is printed. become possible. Furthermore, when the pressure tip 34 moves to the position shown in FIG. Rotate the shaft 65 in the direction. As a result, the rack 65a comes off the screw 64a (see FIG. 7) of the rotating body 64, and the hammer carriage 60 is no longer restrained. Therefore, the hammer carriage 60 returns to (near) the initial position again by the force of the return spring 61, and becomes ready to print the next line.

[Effects of this invention]

As described above, according to the present invention, partial teeth are provided around the rotating body that rotates as the writing member moves, and the partial teeth are engaged with the paper feed gear to rotate the paper feed roller. Therefore, when the writing member reaches a midway position of the movement stroke, for example, the end of the stroke, the paper feed roller rotates and the paper feed operation is performed. Then,
without moving the writing member a full stroke.
Paper feeding is done quickly. Therefore, even if the writing member is returned halfway to print the next line, the paper has already been fed by the predetermined pitch, making it possible to print from the middle and reducing the processing time. be shortened.

In addition, by changing the movement position of the writing member beyond the printing operation range, the number of meshing teeth between the partial teeth and the paper feed gear can be changed, thereby changing the rotation angle between the paper feed gear and the paper feed roller. ,
Since the paper feed pitch is set, the effect is that the paper feed pitch can be arbitrarily set as required for graphics, character printing, etc.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention.
The figure is a plan view of a recording device equipped with both a thermal head and a type printing mechanism, Figure 2 is a perspective view showing the movement mechanism of the thermal head, the platen mechanism, and the paper feed mechanism, and Figure 3 is a press-contact of the thermal head against the platen. Plan view showing operation, Figure 4A, Figure 4B
Figures 4C and 4D are operation-specific explanatory diagrams showing the operation of the paper feeding mechanism, Figure 5 is a perspective view of the type printing mechanism, Figure 6 is a perspective view showing the rotating operation of the rack, and Figure 7. is a sectional view showing the hammer mechanism of the type printing mechanism,
Figures 8A and 8B are explanatory diagrams showing the feeding pitch of the recording paper, Figure 9 is a side view showing the platen support section, Figure 10 is a sectional view of the platen mechanism, and Figure 11 is a partial enlargement of Figure 10. Figures, Figure 12A, Figure 12B
The figure is a plan view showing the relationship between the movement of the thermal head and the paper feeding operation. 4...Platen mechanism, 6...Recording paper, 30...
... Carriage, SH ... Writing member, 35 ... Wire, 40 ... Bobbin, 42 ... Rotating body (intermediate gear), 42b ... Partial tooth, 45 ... Paper feed gear,
R...Paper feed roller.

Claims (1)

[Scope of utility model registration request] The platen mechanism 4, the carriage 30 that holds the writing member SH and moves in the direction along the platen mechanism 4, and a rotating mechanism that rotates in conjunction with the movement of the carriage 30 and has a plurality of partial teeth 42b formed on its periphery. a paper feed gear 45 provided with a body 42 and a one-way clutch that is arranged in line with the rotating body 42 and drives the paper feed roller R by rotation in only one direction.
When the carriage 30 reaches a predetermined position beyond the printing operation range, the partial tooth 42b
The paper feed gear 45 meshes with the paper feed gear 45, and the carriage 30 further moves in the opposite direction, so that the partial tooth 4
2b, the paper feed gear 45 is rotated to rotate the paper feed roller R, and the amount by which the carriage 30 moves beyond the printing operation range is controlled. A paper feeding mechanism for a recording apparatus characterized by having means for setting a paper feeding pitch by changing the number of meshing teeth with a gear 45.