JPH07246736A - Sheet carrying mechanism and recorder - Google Patents

Abstract

PURPOSE: To provide a rapid drivable sheet conveying mechanism having a low cost, excellent durability and high reliability. CONSTITUTION: When a carriage 15 is returned at a right end, a power transmission protrusion 15d rotates a power transmission pawl member 28 to rotate a power transmission member 26 in a direction of an arrow A. Then, a one-way clutch spring 24b of a left end side generates a tightening torque so that a one-way clutch spring 24a of a left side slips to transmit a drive to a drive shaft 14 through an urban ring 23b to drive a conveying roller 13, thereby conveying a sheet P at a predetermined amount.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying mechanism provided in a serial type recording apparatus for recording a sheet while the recording means is mounted on a conveying body and conveyed.

[0002]

2. Description of the Related Art Conventionally, a serial type recording apparatus mounted on a calculator, a handy terminal or the like is equipped with a first motor for driving a recording means and a second motor for driving a conveying means for conveying a sheet. There is something to be done. For example, while the driving force of the first motor is reciprocatingly moved in the width direction of the recording sheet by a carriage having a recording head mounted thereon via a drive transmission means such as a wire, a belt, or a screw, CP.
After recording one line on the recording paper according to the recording information from U, the feed roller shaft provided with the feed roller is rotated by the driving force of the second motor to feed the paper by one line. A device is known which records a plurality of lines by repeating the operation.

A single motor is used to feed only the first drive transmission path for reciprocating the carriage and the timing when the recording head mounted on the carriage moves to both end positions of the movement range after passing through the recording area. A device equipped with two drive transmission paths, that is, a second drive transmission path for transmitting drive to a toothless gear that feeds paper by rotating the feed roller shaft by meshing with a gear provided on the roller shaft, is known. ing.

Alternatively, a single motor is used to provide two drive transmission paths, a first drive transmission path for reciprocating the carriage and a second drive transmission path for rotating the feed roller shaft. However, there is known a device configured to perform drive transmission to a feed roller shaft through a one-way clutch, perform a recording operation when the carriage moves in one direction, and do not perform a recording operation when the carriage moves in the reverse direction, and perform paper feeding. ing.

[0005]

However, in the above-mentioned prior art, when two motors, that is, the first motor for driving the carriage and the second motor for driving the feed roller shaft are used, the manufacturing cost becomes high. There was a problem.

When the drive is transmitted to the tooth-missing gear by using a single motor and the drive is transmitted by meshing with the gear provided on the feed roller shaft, the paper-feeding of the tooth-missing gear is performed every time the paper is fed. Since the teeth collide with and slide on the tooth surface of the gear provided on the feed roller shaft, the paper feed tooth may be worn and the meshing may be deviated, resulting in a deviation of the paper feed pitch. Further, in an apparatus that records only when moving in one direction among the reciprocating movements of the carriage, it is difficult to accelerate the speed of the apparatus.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a low cost, excellent durability, high reliability, and high speed driveable sheet conveying mechanism.

[0008]

The typical means for solving the above-mentioned problems of the prior art and applied to the embodiments described below are drive means and transmission of drive from the drive means by the first drive transmission means. In a sheet conveying mechanism equipped with a conveyer which is reciprocated and reciprocates, and a sheet conveyer which conveys a sheet by being transmitted to a drive shaft by the movement of the conveyer, a linear movement of the conveyer is rotated. A second drive transmission means having a rotating member for converting into a drive shaft of the sheet conveying means and transmitting the drive shaft to the drive shaft of the sheet conveying means; and a clutch means for transmitting drive to the drive shaft only when the rotating member rotates in one direction. When the conveyance body is folded back at the end of the movement range, the rotation member transmits drive to the drive shaft via the clutch means to drive the sheet conveyance means.

[0009]

According to the above means, when the conveying body is folded back at the end of the moving range, the driving force is transmitted from the rotating member provided in the second drive transmitting means to the drive shaft through the crack means to move the sheet conveying means. The sheet is driven to convey a predetermined amount.

[0010]

【Example】

 [First Embodiment]

Next, a sheet conveying mechanism according to an embodiment of the present invention to which the above means is applied will be described with reference to the drawings. This embodiment will be described by using a printer installed in a calculator as a recording device and using a sheet transport mechanism installed in the printer. FIG. 1 is a perspective explanatory view of a sheet conveying mechanism, and FIG. 2 is a perspective view showing an external configuration of a calculator.

(Appearance configuration)

First, the external structure of the calculator will be described with reference to FIG. 1 is an upper case and 2 is a lower case, and these constitute the exterior of the calculator. Reference numeral 3 denotes a keyboard, which is provided with a numeric keypad for inputting numerical values, function keys for performing various calculations, and the like. 4 is a display window,
The input information input from the keyboard 3 is displayed. Reference numeral 5 denotes a slide switch unit for switching ON / OFF the power source of a display unit described later. A printer cover 6 is held by the upper case 1 at the upper position of the printer. 7 is a paper cutter attached to the printer cover,
The recording sheet described below is cut. 8a, 8b
Is a roll holder, which is attached to the rear side of the apparatus and rotatably holds a sheet roll 9 in which a long sheet P such as recording paper is wound in a roll shape. 10 is a calculator power switch, which turns the power ON / O.
FF switching is performed.

In the above-mentioned calculator, the leading end 9a of the sheet P is pulled out from the sheet roll 9 and passes through the inside of the printer through a sheet insertion opening (not shown), and the blade edge portion 7a of the cutter 7 is scraped from below the paper cutter 7 to the outside of the apparatus. Be guided. The sheet front end 9a is pulled in the front direction and pressed against the blade edge portion 7a so that the long sheet P can be cut at a desired position.

(Configuration of Printer)

Next, the structure of the printer equipped with the sheet conveying mechanism mounted on the calculator will be described with reference to FIG. Reference numeral 11 denotes a printer as a recording device, which has the following configuration. Reference numeral 12 is a pulse motor as a driving means, which is driven in forward or reverse by a control signal. 13 is a conveyance roller as sheet conveyance means,
A cylindrical roller made of hard rubber or the like is fitted in the center of the drive shaft 14. The conveyance roller 13 conveys the long sheet P that has entered a U-shaped conveyance path. Reference numeral 15 denotes a carriage as a conveying body, which carries a recording head 16 as a recording means and reciprocates in the width direction of the sheet P. The carriage 15 has sliding holes
By inserting the sliding shafts 17a and 17b into the sliding shafts 15a and 15b, the sliding shafts 17a and 17b are slidably connected in the width direction of the sheet P along the sliding shafts 17a and 17b.

An ink jet recording system is adopted for the recording head 16, and the recording head 16 ejects ink in accordance with a signal from a control section (not shown) to perform recording at a recording position on the sheet P. . That is, this recording head has a fine liquid discharge port (orifice), a liquid passage and an energy acting portion provided in a part of this liquid passage, and energy generation for generating droplet forming energy for acting on the liquid in the acting portion. Equipped with means.

As an energy generating means for generating such energy, a recording method using an electromechanical transducer such as a piezo element, electromagnetic waves such as a laser are irradiated to generate heat, and droplets are ejected by the action of the heat generation. There are a recording method using an energy generating means, a recording method using an energy generating means for heating a liquid and discharging the liquid by an electrothermal converter such as a heating element having a heating resistor.

Among them, the recording head used in the ink jet recording method for ejecting a liquid by thermal energy has a high density of liquid ejection ports (orifices) for ejecting recording liquid droplets to form ejection liquid droplets. Since they can be arranged, high resolution recording is possible. Among them, the recording head using the electrothermal converter as the energy generating means can easily be made compact, and has the advantages of the IC technology and the microfabrication technology, which have been remarkably improved in technology and reliability in the recent semiconductor field. This is advantageous because it can be used in two parts, high-density mounting is easy, and the manufacturing cost is low.

(First drive transmission means)

Reference numeral 18 denotes a worm gear, which is the pulse motor
It is press-fitted and fixed to 12 rotary shafts. 19 forms a worm wheel 20 that meshes with the worm gear 18, and
A drive pulley having teeth that mesh with a toothed timing belt (21). Reference numerals 22a and 22b denote driven pulleys, which are provided near both ends of the moving range of the carriage 15 described above, and have teeth that mesh with the above-described toothed timing belt 21. The timing belt 21 is in the form of an endless belt, and is hung on the drive pulley 19 and the driven pulleys 22a and 22b, and some teeth of the timing belt 21 are locked to locking portions (not shown) of the carriage 15. . Therefore, the pulse motor
The driving force of 15 is transmitted to the worm wheel 20 and the drive pulley 19 via the worm gear 18, and the timing belt 21
The carriage 15 is reciprocated in the width direction of the sheet P along the sliding shafts 17a and 17b via the. The above is the carriage 15
The first transmission means for reciprocating the sheet P in the width direction of the sheet P is configured.

(Clutch means)

Urban rings 23a (not shown) and 23b are press-fitted and fixed near both ends of the drive shaft 14 of the conveying roller 13. The one-way clutch springs 24a and 24b having a winding portion as a clutch means and a hook portion are wound around the urban rings 23a and 23b in a slightly fitted state. For this reason, the one-way clutch springs 24a and 24b are connected to the urban ring 23.
When rotating relative to a and 23b in the winding direction,
When the contact area between the two increases, a large transmission torque (hereinafter referred to as "tightening torque") is generated. Conversely, when relatively rotating in the loosening direction, the contact area between the two decreases and a small transmission torque (hereinafter referred to as "slack torque"). Torque)).

(Second drive transmission means)

Numerals 25 and 26 are cylindrical power transmission members which are rotating members, and the one-way clutch spring 24
It is fitted from both ends of the drive shaft 14 so as to cover the outer peripheries of the urban rings 23a and 23b around which a and 24b are wound. Around the power transmission members 25 and 26, slits 25a and 26a for locking the hook portions (winding end portions) of the one-way clutch springs 24a and 24b are formed,
Further, bevel gears 25b and 26b for transmitting drive from power transmission claw members 27 and 28, which will be described later, are formed at both ends in the axial direction.

The power transmission claw members 27, 28 transmit the drive to the power transmission members 25, 26, and are rotated by the power transmission projections 15c, 15d formed on the upper edge of the carriage 15. Claws 27a, 28a and the bevel gear 25
Bevel gears 27b and 28b are formed to mesh with b and 26b, respectively. Further, one ends of tension coil springs 29 and 30 which are elastic members are connected to locking holes 27c and 28c formed in the power transmission claw members 27 and 28, respectively, and are attached in the counterclockwise direction and the clockwise direction, respectively. It is energized. Normally, the rotation of the power transmission pawl members 27, 28 is stopped by locking the stoppers 31, 32 (not shown) to the pins 27d, 28d protruding from the side surfaces of the power transmission pawl members 27, 28, respectively. There is. The loosening torque of the one-way clutch springs 24a and 24b is set to be smaller than the biasing torque of the tension coil springs 29 and 30. Therefore, the linear movement accompanying the movement of the carriage 15 is the power transmission pawl members 27, 28 and the power transmission members 25, which serve as the second drive transmission means.
It is converted into rotary motion via 26, and this power is transferred to the urban ring 23 via one-way clutch springs 24a and 24b.
a, 23b and the drive shaft 14 are configured to transmit drive.

(Operation of Sheet Conveying Mechanism)

Next, the operation of the sheet conveying mechanism in the printer 11 will be described. As for the carriage 15, the position shown in FIG. 2 is changed to the left end initial position (hereinafter referred to as “home position”).
That is). When the control signal is transmitted to the pulse motor 12, the worm gear 18 rotates in the forward direction (for example, clockwise direction), the drive pulley 19 and the toothed timing belt 21 rotate in the counterclockwise direction, and the carriage 15 slides. Axis of motion
Move to the right along 17a and 17b. Above carriage
The recording head 16 mounted on the sheet 15 moves to the recording area, and then, according to the image information (recording signal) transmitted, the sheet P
Is recorded at the predetermined position of. When the recording head 16 moves to the right end of the recording area, the recording operation for one line is completed. When the carriage 15 further moves rightward and reaches the right end portion of the movement range, the power transmission projection 15d hits the claw portion 28a of the power transmission claw member 28 and pushes it.
The power transmission pawl member 28 is rotated counterclockwise by a predetermined amount against the tensile force of the tension coil spring 30 to rotate the bevel gear 28.
The power transmission member 26 is rotated by a predetermined amount in the direction of arrow A via b and 26b. At this time, the slit 26 of the power transmission member 26
Since the hook portion of the one-way clutch spring 24b locked to a is rotated in the direction of arrow A by a predetermined amount, the one-way clutch spring 24b rotates the drive shaft 14 in the direction of arrow A by the tightening torque via the urban ring 23b. .

At the left end of the drive shaft 14, a one-way clutch spring 24a is provided via an urban ring 23a.
, The rotation of the hook portion is regulated by the slit 25a of the power transmission member 25, the bevel gear 25b of the power transmission member 25 meshes with the bevel gear 27b of the power transmission pawl member 27, and the power transmission pawl Member 27 is tension coil spring 29
The one-way clutch spring 24a does not rotate in the direction of arrow A due to the biasing torque. Therefore, the urban ring 23a (not shown) and the one-way clutch spring 24a slip, so that the drive shaft 14 rotates in the direction of arrow A by the tightening torque of the one-way clutch spring 24b, and the conveying roller 13 conveys the sheet P. In this way, the carriage 15
When reaches the rightmost end of the moving range, the amount of rotation of the power transmission member 26 in the direction of arrow A becomes maximum, and the paper feeding operation for one line is completed.

After the paper feed for one line is completed, a control signal is transmitted to the pulse motor 12, the worm gear 18 rotates in the reverse direction (for example, the counterclockwise direction), and the drive pulley 19 and the toothed timing belt 21 move. The carriage 15 rotates leftward and the carriage 15 moves leftward. At this time, the power transmission pawl member 28 on the right end side rotates counterclockwise by the biasing torque of the tension coil spring 30, and the power transmission member 26 rotates in the direction of arrow B via the bevel gears 28b and 26b. Slit 26
The one-way clutch spring 24b locked to a also rotates in the direction of arrow B. The drive shaft 14 receives the loosening torque of the one-way clutch spring 24b in the direction of arrow B via the urban ring 23b. At this time, the power transmission pawl member on the left end side
27 receives the biasing torque of the tension coil spring 29 in the tension direction, but the pin 27d is locked to the stopper 31,
The power transmission member 25 has a bevel gear 25b meshing with a bevel gear 27b of the power transmission pawl member 27, and the hook portion of the one-way clutch spring 24a is a slit of the power transmission member 25.
Since the rotation in the direction of the arrow B is restricted by 25a, the urban ring 19 and the one-way clutch spring 24 on the right end side are
The drive shaft 14 does not rotate due to slippage at the contact surface with b.

The power transmission pawl member 28 is attached to the pin 28d.
When the carriage returns to the limit position where it is locked by the stopper 32 (not shown), that is, when the carriage returns to the home position at the right end of the carriage 15, one line of recording and paper feed are completed, and the pulse motor 12 sends a control signal. The driving is stopped by or the continuous operation is performed for recording and feeding the next line. The recording and paper feeding operations when the carriage 15 is moved from the right end home position to the left end home position are omitted because the functions of the left and right component elements are reversed.

According to the above construction, when the carriage 15 moves to the end and is folded back, the power is transmitted to the drive shaft 14 by the power transmission claw members 27, 28 and the power transmission members 25, 26, so that the paper is fed. It is possible to provide a sheet conveyance mechanism that is quiet, has excellent durability, and can be driven at high speed with high reliability at low cost. Further, in the printer, high-quality images can be recorded at high speed.

In this embodiment, the pulse motor 12 is used as the driving means, but a DC motor is used by controlling the product reverse rotation, and the carriage 15 is provided with a position detecting element such as a photo sensor in a frame (not shown). ) Or position information of a slit plate provided on the case is detected, and timing control of recording and motor stop can be performed.

Further, by making the contact surfaces of the power transmission projections 15c and 15d formed on the carriage 15 and the power transmission claw members 27 and 28 oblique with respect to the collision direction, collision noise can be reduced. Even if the contact surface is worn, the paper feed pitch is hardly disturbed.

[Second Embodiment]

Next, another example of the sheet conveying mechanism will be described with reference to FIG. Since the schematic configuration of the printer is the same as that of the first embodiment, the same members are designated by the same reference numerals and the description thereof will be omitted. The configuration of the sheet conveying mechanism will be mainly described below.

(Clutch means)

Urban rings 23a (not shown) and 23b are press-fitted and fixed near both ends of the drive shaft 14 of the conveying roller 13. The one-way clutch springs 24a and 24b having a winding portion as a clutch means and a hook portion are wound around the urban rings 23a and 23b in a slightly fitted state. Therefore, when the one-way clutch springs 24a, 24b rotate relative to the urban rings 23a, 23b in the winding direction, the contact area between the two increases and a tightening torque is generated. Conversely, when the one-way clutch springs 24a, 24b rotate relatively in the loosening direction. Reduces the contact area between the two and generates a loosening torque.

(Second drive transmission means)

Reference numerals 33 and 34 denote cylindrical power transmission members, which are rotating members, and the one-way clutch spring 24.
It is fitted from both ends of the drive shaft 14 so as to cover the outer peripheries of the urban rings 23a and 23b around which a and 24b are wound. Around the power transmission members 33, 34, slits 33a, 34a for locking the hook portions (winding end portions) of the one-way clutch springs 24a, 24b are formed,
Further, cams 33b and 34b are respectively formed over the outer peripheral surface in the longitudinal direction, and rotation restricting protrusions 33c and 34c are provided on the outer peripheral surface opposite to the cams 33b and 34b, respectively. The cams 33b and 34b are pushed up by the power transmission projections 15c and 15d provided on the carriage 15 to convert the linear motion of the carriage 15 into a rotary motion to transmit power. Further, the rotation restricting protrusions 33c, 34c are configured to have a rotation degree of freedom by a predetermined angle by means of rotation restricting ribs 35, 36 provided on a frame (not shown).

Torsional coil springs 37 and 38 are fitted into the projections 33d and 34d provided on both axial end surfaces of the power transmission members 33 and 34, respectively. One of the winding ends of the torsion coil springs 37 and 38 forms a hook portion that projects in the axial direction.
It is inserted into locking holes 33e, 34e (not shown) around 34d and regulates relative movement in the circumferential direction. Further, the other winding ends of the torsion coil springs 37 and 38 form hook portions standing up in the circumferential direction, and are locked and fixed to slits of a base frame (not shown). The torsion coil springs 37 and 38 normally urge the power transmission members 33 and 34 in the direction of arrow B, and the urging torque is sufficiently larger than the loosening torque of the one-way clutch springs 24a and 24b. Is set to. Therefore, the linear movement accompanying the movement of the carriage 15 is converted into rotational movement via the power transmission members 33 and 34 as the second drive transmission means, and this power is transmitted via the one-way clutch springs 24a and 24b to the urban ring 23a. 23b and the drive shaft 14 are configured to transmit drive.

(Operation of Sheet Conveying Mechanism)

Next, the operation of the sheet conveying mechanism in the printer 11 will be described. The carriage 15 has the initial position shown in FIG. 3 as the left end home position. When the control signal is sent to the pulse motor 12, the worm gear
18 rotates in the forward direction (eg, clockwise direction), the drive pulley 19 and the toothed timing belt 21 rotate in the counterclockwise direction, and the carriage 15 moves to the right along the slide shafts 17a and 17b. . The recording head 16 mounted on the carriage 15 moves to a recording area and then records at a predetermined position on the sheet P according to the image information (recording signal) transmitted. When the recording head 16 moves to the right end of the recording area, the recording operation for one line is completed. When the carriage 15 further moves rightward and reaches the right end portion of the movement range, the power transmission projection 15d causes the cam 34b of the power transmission member 34 to move.
After abutting on the lower surface side, the power transmission member 34 is rotated in the direction of arrow A while twisting the torsion coil spring 38 (accumulating the returning force in the direction of arrow B). At this time, since the hook portion of the one-way clutch spring 24b locked in the slit 34a of the power transmission member 34 is rotated in the direction of arrow A by a predetermined amount, the one-way clutch spring 24b generates a tightening torque. At the left end of the drive shaft 14, an urban ring 23a (not shown)
Although the loosening torque of the one-way clutch spring 24a acts through the hook, the hook portion is provided with the slit 33a of the power transmission member 33.
The rotation of the power transmission member 33 is restricted by the torsion coil spring 37, and the power transmission member 33 is biased in the direction of arrow B by a biasing torque larger than the loosening torque of the one-way clutch spring 24a. Therefore, the urban ring 23a (not shown) and the one-way clutch spring 24a slip, so that the drive shaft 14 rotates in the direction of arrow A due to the tightening torque of the right end portion, and the conveyance roller 13 conveys the sheet P. in this way,
When the carriage 15 reaches the right end of the moving range, the cam
34b maximizes the amount of rotation of the power transmission member 34 in the direction of the arrow A (at this time, the rotation restricting protrusion 34c is within the rotation range of the rotation restricting rib 36), and the paper feeding operation for one line is completed.

After the paper feed for one line is completed, a control signal is transmitted to the pulse motor 12, the worm gear 18 rotates in the reverse direction (for example, the counterclockwise direction), and the drive pulley 19 and the toothed timing belt 21 move. The carriage 15 rotates leftward and the carriage 15 moves leftward. At this time, the power transmission pawl member 34 on the right end side is rotated in the direction of arrow B by the return biasing torque of the torsion coil spring 38, and is locked in the slit 34a of the power transmission member 34 by the one-way clutch spring 24b.
Also rotates in the direction of arrow B. Drive shaft 14 is urban ring 23
Arrow B of one-way clutch spring 24b through b
Direction loosening torque. At this time, drive shaft at the left end
Even if 14 tries to rotate in the direction of arrow B (a tightening torque is generated in the one-way clutch spring 24a), the rotation restricting rib 35 locks the rotation restricting protrusion 33c to restrict the rotation in the direction of arrow B. Further, the hook portion of the one-way clutch spring 24a is provided with the slit 33a of the power transmission member 33.
Since the rotation in the direction of arrow B is restricted by, the drive shaft 14 does not rotate due to slippage at the contact surface between the urban ring 19 on the right end side and the one-way clutch spring 24b.

Then, when the power transmission claw member 34 returns to the rotation limit in the direction of arrow B by the return biasing torque of the torsion coil spring 38, that is, when it returns to the right end home position of the carriage 15, one row is completed. After the recording of minutes and the paper feeding are completed, the pulse motor 12 stops the drive according to the control signal, or continues to operate to record and feed the next line. The recording and paper feeding operations when the carriage 15 is moved from the right end home position to the left end home position are omitted because the functions of the left and right component elements are reversed.

In this embodiment, the one-way clutch spring 24 is used as a condition for reliably feeding the paper.
The loosening torque of b is smaller than the tightening torque of the one-way clutch spring 24a and the biasing torque of the torsion coil spring 38, and the one-way clutch spring 24
It is necessary that the loosening torque of a is smaller than the tightening torque of the one-way clutch spring 24b and the biasing torque of the torsion coil spring 37, but the torque value does not need to be highly accurate.

Therefore, the one-way clutch spring 24
Since a and 24b can be round cross-section wire rods, they do not have to be square wire pull-out wire rods that are used when high-precision tightening torque and loosening torque are required. The number of heat treatments at that time can be reduced, the yield can be significantly improved, and the manufacturing cost can be reduced.

The cam 33 formed on the power transmission members 33, 34
The shapes of b and 34b are such that the sound and impact due to the collision with the power transmission projections 15c and 15d formed on the carriage 15 are reduced so that the power transmission members 33 and 34 rotate per unit movement amount of the carriage 15. It is desirable to have a wave shape in which the angle changes from small to large.

In this embodiment, the pulse motor 12 is used as the driving means, but a DC motor is used by controlling the product reverse rotation, and the carriage 15 is provided with a position detecting element such as a photo sensor in a frame (not shown). It is also possible to detect the positional information of the slit plate provided in the case or the case and perform timing control of recording and motor stop.

[Third Embodiment]

Next, another example of the sheet conveying mechanism will be described. Since the schematic configuration of the printer is the same as that of the first embodiment, the same members are designated by the same reference numerals and the description thereof will be omitted. The configuration of the sheet conveying mechanism will be mainly described below.

In the first and second embodiments, the drive transmission of the carriage 15 as the carrier and the drive shaft 14 is performed by different drive transmission paths, but as shown in the present embodiment,
It is also possible to do these with a single drive transmission path. That is, at least in the movement range section of the carriage 15, the toothed timing belt 21 is connected to the drive pulley 19 and the driven pulley.
A power transmission member 25 and a power transmission pawl member 27 for converting the linear motion of the carriage 15 into a rotary motion for power transmission are provided at the left end. Further, by providing the power transmission projections 21a and 21b (not shown), which are activated when the carriage 15 is moved to the left end portion and the right end portion, respectively at corresponding positions on the toothed timing belt 21, both left and right ends of the carriage 15 are provided. Paper can be fed at the same time when the home position is moved.

According to the above construction, the number of parts can be further reduced to reduce the manufacturing cost, and it is possible to contribute to the miniaturization of the device.

In each of the above-mentioned embodiments, the ink jet recording system was used as the recording means, but the electrothermal converter is energized according to the recording signal, and the thermal energy applied by the electrothermal converter is applied to the ink. It is more preferable that the ink is ejected from the ejection port for recording by the growth and contraction of the bubbles generated in the ink by utilizing the film boiling that occurs.

With regard to its typical structure and principle, it is preferable to use the basic principle disclosed in, for example, US Pat. Nos. 4,723,129 and 4740796. This method can be applied to both the so-called on-demand type and continuous type, but in the case of the on-demand type in particular, it is arranged corresponding to the sheet or liquid path holding the liquid (ink). By applying at least one drive signal to the electrothermal transducer, which corresponds to the recorded information and gives a rapid temperature rise beyond nucleate boiling,
This is effective because heat energy is generated in the electrothermal converter to cause film boiling on the heat acting surface of the recording head, and as a result bubbles in the liquid can be formed in a one-to-one correspondence with this drive signal. Due to the growth and contraction of the bubbles, the liquid is ejected through the ejection openings to form at least one droplet. It is more preferable to make this drive signal into a pulse shape, because the bubble growth and contraction are immediately and appropriately performed, so that particularly excellent liquid ejection can be achieved.

As the pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable. If the conditions described in US Pat. No. 4,313,124, which is an invention relating to the rate of temperature rise on the heat acting surface, are adopted, more excellent recording can be performed.

As the constitution of the recording head, in addition to the combination constitution of the discharge port, the liquid passage, and the electrothermal converter (the straight liquid passage or the right-angled liquid passage) as disclosed in the above-mentioned respective specifications. The present invention also includes configurations using US Pat. Nos. 4,558,333 and 4,459,600, which disclose configurations in which the heat acting portion is arranged in a bending region.

Further, JP-A-59-123670, which discloses a structure in which a common slit is used as a discharge portion of a plurality of electrothermal converters, and an opening for absorbing a pressure wave of thermal energy are disclosed. Japanese Patent Laid-Open Publication No.
The effect of the present invention is effective even if the configuration is based on Japanese Patent Laid-Open No. 59-138461. That is, according to the present invention, recording can be surely and efficiently performed regardless of the form of the recording head.

A recording head fixed to the carriage,
Alternatively, a replaceable chip-type recording head that can be electrically connected to the apparatus main body and can supply ink from the apparatus main body when mounted on a carriage, or an ink tank is integrally provided on the recording head itself. A cartridge type recording head may be used.

Further, it is preferable to add a recovery means for the recording head, a preliminary auxiliary means, etc., which are provided as a constituent of the recording apparatus of the present invention, because the effects of the present invention can be further stabilized. Specifically, these are capping means, cleaning means, pressurizing or suctioning means for the recording head, preheating means by electrothermal conversion type or other heating element or a combination thereof, and recording. It is also effective to perform a stable recording by performing a preliminary discharge mode in which another discharge is performed.

Regarding the type or number of recording heads mounted on the carriage, for example, only one is provided corresponding to a single color ink, or a plurality of inks having different recording colors and densities are supported. And a plurality of them may be provided. That is, for example, the recording mode of the recording apparatus is not limited to a recording mode of only the mainstream color such as black, but may be a combination of a plurality of recording heads integrally formed, but a mixed color of different colors or a mixed color It is also applicable to a device with at least one of the full colors according to

In addition, in the above-mentioned embodiments, the ink is described as a liquid, but it is an ink which solidifies at room temperature or lower and softens or liquefies at room temperature, or in the ink jet recording system. 30 inks
Generally, the temperature is controlled in the range of ℃ or more and 70 ℃ or less to control the temperature of the ink so that the viscosity of the ink is in the stable ejection range. good. In addition, it is possible to prevent the temperature rise due to thermal energy from being positively used as the energy for changing the state of the ink from the solid state to the liquid state, or to use the ink that solidifies when left standing for the purpose of preventing ink evaporation. However, in any case, heat is applied such as ink that is liquefied by application of heat energy according to the recording signal and liquid ink is ejected, or that begins to solidify when it reaches the recording sheet. It is also applicable when using an ink that has the property of being liquefied for the first time by energy.

The ink in such a case is disclosed in JP-A-54-5.
As described in JP-A-6847 or JP-A-60-71260, a form in which it is opposed to an electrothermal converter in a state where it is held as a liquid or a solid substance in a concave portion or a through hole of a porous sheet. Also good. The most effective one for each of the above-mentioned inks is to execute the above-mentioned film boiling method.

Further, as a form of the above-mentioned recording device,
In addition to the one used as an image output terminal such as a printer, a numerical output terminal such as a handy terminal, a copying apparatus combined with a reader, and a facsimile apparatus having a transmission / reception function may be used.

Although an example of using the ink jet recording system as the recording means has been described above, the present invention is not limited to the ink jet recording system, and other thermal transfer recording system, thermal recording system, Can also be applied to a recording method other than the impact recording method such as the wire dot recording method.

[0066]

As described above, according to the present invention, since the power is transmitted to the drive shaft by the second drive transmission means to convey the sheet when the conveying body is moved to the end portion and folded back, the sheet is quiet.
It is possible to provide a highly reliable and highly reliable sheet transport mechanism that can be driven at high speed at low cost. Further, in the recording device, high quality images can be recorded at high speed.

[Brief description of drawings]

FIG. 1 is a perspective explanatory view of a sheet conveying mechanism according to a first embodiment.

FIG. 2 is a perspective view showing an external configuration of a calculator.

FIG. 3 is a perspective explanatory view of a sheet conveying mechanism according to a second embodiment.

[Explanation of symbols]

 1 ... Upper case 2 ... Lower case 3 ... Keyboard 4 ... Display window 5 ... Slide switch 6 ... Printer cover 7 ... Paper cutter 7a ... Blade edge portion 7b ... Transparent portion 7c ... Side portions 8a, 8b ... Roll holder 9 ... Recording sheet 9a ... Sheet tip 9b ... Sheet roll 10 ... Power switch 11 ... Printer 12 ... Pulse motor 13 ... Conveying roller 14 ... Drive shaft 15 ... Carriage 15a, 15b ... Sliding holes 15c, 15d ... Power transmission projection 16 ... Recording head 17a, 17b ... Sliding shaft 18 ... Worm gear 19 ... Drive pulley 20 ... Worm wheel 21 ... Toothed timing belt 22a, 22b ... Driven pulley 23a, 23b ... Urban ring 24a, 24b ... One-way clutch spring 25, 26, 33, 34 ... Power Transmission members 25a, 26a, 33a, 34a ... Slits 25b, 26b, 27b, 28b ... Bevel gears 27, 28 ... Power transmission pawl members 27a, 28a Claws 27c, 28c ... Locking holes 27d, 28d ... Pins 29, 30 ... Tensile coil springs 31, 32 ... Stoppers 33b, 34b ... Cams 33c, 34c ... Rotation restriction projections 33d, 34d ... Projections 33e, 34e ... Locking Holes 35, 36 ... Rotation restriction ribs 37, 38 ... Torsion coil spring

Claims (10)

[Claims] 1. A drive unit, a carrier for transmitting and receiving a drive from the drive unit by a first drive transmitting unit, and a reciprocating movement; and a drive shaft for driving the conveyance unit to convey a sheet. A sheet conveying mechanism equipped with a sheet conveying means; a second drive transmitting means having a rotating member for converting linear movement of the conveying body into rotational movement and transmitting the rotational movement to a drive shaft of the sheet conveying means; Clutch means for transmitting drive to the drive shaft only when rotating in one direction, and when the transport body is folded back at the end of the moving range, the rotary member drives the drive shaft via the clutch means. A sheet conveying mechanism characterized by transmitting the sheet to drive the sheet conveying means. 2. The sheet transport mechanism according to claim 1, wherein the power transmission projection provided on the transport body rotates the rotating member of the second drive means to transmit the drive. 3. The sheet conveying mechanism according to claim 1, wherein the rotating member and the clutch means are provided on a drive shaft facing both ends of a moving range of the conveying body. 4. The sheet conveying mechanism according to claim 1, wherein the drive transmission from the rotary member to the drive shaft by the clutch means is performed when the rotary member rotates forward. 5. The rotating member is rotatable only by a predetermined angle and is urged in a returning direction by an elastic member, and the urging torque is larger than the torque generated by the clutch means in the returning direction. The sheet conveying mechanism according to claim 1. 6. The second drive transmission means and the clutch means are provided on a drive shaft facing one end of a moving range of a carrier, and are driven by a toothed timing belt of the first drive transmission means. 2. The sheet conveying mechanism according to claim 1, wherein the rotary member is rotated via the clutch means to perform drive transmission. 7. A recording apparatus comprising: the sheet transport mechanism according to claim 1; and a recording unit that is mounted on a transport body of the sheet transport mechanism and records an image on a sheet according to image information. 8. The recording apparatus according to claim 7, wherein the recording unit is an ink jet recording system that performs recording by ejecting ink in accordance with a signal based on image information. 9. The recording apparatus according to claim 8, wherein the recording unit includes an electrothermal converter for generating thermal energy for ejecting ink. 10. The recording apparatus according to claim 9, wherein the recording unit ejects the ink from the ejection port by utilizing the film boiling generated in the ink by the thermal energy applied by the electrothermal converter. .