JPH0574469B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a thermal recording device that feeds a roll of recording paper to a thermal recording head and records images such as characters and figures with the thermal recording head. .

BACKGROUND OF THE INVENTION In recent years, recording devices employing thermal recording methods and thermal transfer recording methods have been actively developed because of their low noise and maintenance-free advantages.

A conventional recording device will be explained below.

FIG. 3 is a sectional view of the main parts of a conventional recording device.
41 is a thermal head in which a large number of heating resistive elements are arranged in a row; 42 is a cylindrical platen whose outer periphery is covered with rubber to absorb the undulations of the thermal head 41; and 47 is held in a wound state on a roll. The highly smooth recording paper 48 is a recording paper roll in which the recording paper 47 is wound into a roll around a shaft 48a. An ink sheet 43 is pressed by the thermal head 41 and pressed against the platen 42 while being overlapped with the recording paper 47, and the ink sheet 43 is a plastic film several microns thick with ink applied thereto. 44 is ink sheet 4
3 is a supply reel for supplying the ink sheet 43; 45 is a take-up reel on which the ink sheet 43 used for recording is wound;
63 is a discharge roller that discharges the recording paper 47 that has been recorded by the thermal head 41; 75 is a chassis that has a cover 75a attached to the printer so that it can be opened and closed; 46 is a removable roller that includes a supply reel 44 and a take-up reel 45; This is an ink sheet cassette, and the supply reel 44 and take-up reel 45 can be replaced when the ink sheet 43 is used up. 49 is a metal capstan roller with relatively high hardness, 50 is a pinch roller with rubber on the outer periphery and has a surface with relatively low hardness, and 51 supports pinch roller 50, with shaft 52 as the center. The rotatable support member 53 is a spring with a relatively weak spring coefficient (200 to 300 gW/mm) that pulls the support member 51, and the support member 51 receives a counterclockwise force due to the spring 53. Pinch roller 50 is capstan roller 4
It's pushed to 9. 54 is a strong pressure member that is rotatably attached around the shaft 52 and is pulled by a spring 55 having a relatively strong spring coefficient (1000 to 1500 gW/mm).The strong pressure member 54 rotates the support member 51 counterclockwise. pushing in the direction. 56
is driven by a motor (omitted in the figure), and the strong pressure member 54 resists the spring force of the spring 55.
61 is a conveyance roller that conveys the recording paper 47 that has passed through the platen 42, 62 is a cutter that cuts the recording paper 47, and 70, 71, 72, and 73 are guides. It's a roller. 64 is a recording paper holding member that supports the recording paper roll 48;
is the groove 64i in which the shaft 48a slides, and the shaft 64
g, an arm 64f rotatably supported around a shaft 64g, a spring 64h that pulls the arm 64f, a recording paper pressing roller 64b attached to the arm 64f, and an opening 64d for feeding out the recording paper 47. , and an opening 64e. The recording paper 47 is attached by first attaching the shaft 48a of the recording paper roll 48 to the groove 64i, and then pressing the recording paper 47 with the recording paper pressing roller 64b. 65 is a drive roller located in the opening 64e, presses against the recording paper roll 48, and feeds the recording paper 47; 66 is in contact with the recording paper pressing roller 64b, and moves the recording paper roller 64.
This is a feeding roller that feeds the recording paper 47 by sandwiching the recording paper 47 therebetween.

Note that the recording paper 47 is transferred from the feeding roller 66 to the capstan roller 49, platen 42,
A path to the outside of the chassis 75 via the transport roller 61 and the ejection roller 63 is secured by paper guides (not shown in the figure) that sandwich the recording paper 47 from both sides.

The operation of the conventional recording apparatus configured as described above will be described below.

First, after attaching the recording paper 47, when the drive roller 65 and the feeding roller 66 are rotated in the direction in which the recording paper 47 is ejected (hereinafter referred to as the forward feeding direction), the recording paper roll 48 rotates in the direction shown by arrow C. The recording paper 47 is guided between the capstan roller 49 and the pinch roller 50 by a paper guide. At this time, the capstan roller 49, the platen 42, and the conveyance roller 61 are already rotating in the forward feeding direction, and the recording paper 47 is transferred to the platen 4.
2 and then reaches the conveyance roller 61. Recording paper 47
When it reaches the conveyance roller 61, all the rollers stop rotating. At this point, the cam 56 rotates, and the strong pressure member 54 no longer presses the support member 51. In other words, the pinch roller 50 has hitherto been pressed against the capstan roller 49 with a strong force by the springs 53 and 55, but due to the rotation of the cam 56, it is now pressed only by the relatively weak spring 53. Furthermore, at this time, the pressure on the thermal head 41 is also released. Next, with the drive roller 65 stopped, the feed roller 66, the capstan roller 49, the platen 42, and the discharge roller 6
1 in the forward feeding direction to convey the recording paper 47 to the cutter 62 and the discharge roller 63. At this time, since the recording paper drive roller 65 is stopped,
Since the recording paper roll 48 has a large rotational resistance and the pinch roller 50 is in relatively weak pressure contact with the capstan roller 49, the recording paper 47 is pulled by the capstan roller 49 and the pinch roller 50. The capstan roller 49 and pinch roller 50 are moved slightly in the axial direction to remove slack. Due to this movement in the axial direction, the recording paper 4
7 is pulled out straight, and skewed printing can be prevented.

When the length of the recording paper 47 passing through the platen 42 reaches the length for recording, the feed roller 66, capstan roller 49, platen 42, conveyance roller 61, and discharge roller 63
stops, and the thermal head 41 releases the ink sheet 4.
3 and the recording paper 47, the cam 56 rotates, the strong pressure member 54 rotates, the spring 55 pushes the support member 51, and the pinch roller 50 is pressed against the spring 53 again. It is strongly pressed against the capstan roller 49 by the spring 55.

Next, all the rollers are rotated in the direction to wind up the recording paper 47 (hereinafter referred to as the reverse direction), and while moving the recording paper 47 in the direction shown by arrow E,
By sending a recording signal to the thermal head 41, the heating resistor element generates heat, ink on the ink sheet 43 is selectively transferred to the recording paper 47, and an image is recorded on the recording paper 47. Next, when the rear end of the recording paper 47 reaches the thermal head 41, all the rollers stop rotating.

Next, the pressure contact of the thermal head 41 is released, all the rollers rotate in the forward feeding direction, the end of the portion of the recording paper 47 where the image is recorded is moved to the cutter 62, the recording paper 47 is cut by the cutter 62, and the discharge roller 63 to the outside of the chassis 75.

Problems to be Solved by the Invention However, conventionally, the recording paper drive roller 65 stops during the process of taking up the slack of the recording paper 47;
In order to stop only one roller in the conveyance path of the recording paper 47 in this way, it is necessary to drive only the recording paper drive roller 65 with a separate drive source, but at this time, the recording paper drive roller 65 is Recording paper 4
7, and in order to stop it, it is necessary to flow a holding current or a current in the opposite direction to the motor, which has the problem of requiring large power consumption. In addition, there have been some systems that stop the recording paper drive roller by providing some kind of clutch means without using a separate drive source, but in this configuration, the driving force can be gradually interrupted using frictional force. If a complicated clutch is not used, the clutch will not connect properly the next time the recording paper 47 is conveyed, causing slack again between the recording paper drive roller 65 and the feeding roller 66, resulting in skewed printing. It had

Means for Explaining the Problem In order to solve this problem, the present invention provides a recording paper holding member that holds a recording paper roll removably at the bottom, and an opening provided at the bottom of the recording paper holding member. When pulling out the recording paper from the recording paper holding member, the first conveying roller is separated from the recording paper roll, the recording paper roll is moved to a position where it comes into contact with the bottom of the recording paper holding member, and the recording paper is pulled out from the recording paper holding member. The second conveyance roller is moved to a state where the recording paper pulled out from the holding member is weakly held and conveyed, and when the recording paper is returned to the recording paper holding member, the first conveyance roller is caused to protrude from the opening. The second roller moves the recording paper roll to a position where it is separated from the bottom of the recording paper holding member, and transports the recording paper pulled out from the recording paper holding member while tightly holding it. and means for moving the conveyance roller.

Effect With the above configuration, when the first roller leaves the recording paper, the recording paper comes into contact with the bottom of the recording paper holding member, and the conveyance resistance of the recording paper increases due to its own weight. In this state, the slack in the recording paper is removed.

Embodiment FIG. 1 is a sectional view of a recording apparatus according to an embodiment of the present invention, in which 1 is a thermal head, 2 is a platen, 3 is an ink sheet, 4 is a supply reel, 5 is a take-up reel, and 6 is an ink sheet. cassette, 7 is a recording paper, 8 is a recording paper roll, 9 is a capstan roller, 10 is a pinch roller, 11 is a support member, 1
2 is the shaft, 13 is a relatively weak spring coefficient (200~300g
14 is a strong pressure member, 15 is a spring with a relatively strong spring coefficient (1000 to 1500 gW/mm), 21 is a conveyance roller, 22 is a cutter, 23 is an ejection roller, and 24 is a recording paper holder These members have the same configuration as the conventional example. 32 is a cam, 29 is rotatably attached around a shaft 30, and is a spring (not shown in the figure).
The roller support plate drive lever 27 is pressed in the direction shown by the arrow A and comes into contact with the cam 32; 27 is the shaft 2;
8, and has a pin 31 that engages with the roller support plate drive lever 29;
A roller support plate 25 that is linked to the roller support plate drive lever 29 is attached to the roller support plate 27, and is a recording paper drive roller that comes into pressure contact with the recording paper 7 and pushes up the recording paper roll 8 as the roller support plate 27 rotates. , 26 are feed rollers that are in pressure contact with the paper pressing roller 24b and feed out the recording paper 7. 19 is a cam that rotates together with the cam 32; 16;
is a push rod that is slidably supported by pins 17 and 18, is pushed in the direction shown by the arrow by a spring (not shown), and comes into pressure contact with the cam 19.
As the pin 9 rotates, the pin 2 provided on the strong pressure member 14
It is configured to press 0.

The operation of the recording apparatus in this embodiment configured as described above will be described below.

First, after installing the recording paper 7, drive roller 2
5 and feed roller 26 in the forward feeding direction, the recording paper roll 8 rotates in the direction shown by arrow C, and the recording paper 7 is guided between the capstan roller 9 and the pinch roller 10 by the paper guide. At this time, the capstan roller 9, platen 2, and conveyance roller 21 are already rotating in the forward feeding direction, and the recording paper 7 passes through the platen 2 and reaches the conveyance roller 21.

When the recording paper 7 reaches the transport roller 21, all the rollers stop rotating. Here, as shown in FIG. 2, the cam 19 rotates and the push rod 16 moves in the direction shown by arrow H, pushing the pin 20.
The strong pressure member 14 no longer presses the support member 11. In other words, the pinch roller 10 has hitherto been pressed against the capstan roller 9 with a strong force by the springs 13 and 15, but due to the rotation of the cam 19, it is now pressed only by the relatively weak spring 13. At this time, the cam 32 also rotates. Along with this, the roller support plate drive member 29 rotates in the direction shown by arrow G, and at the same time, the roller support plate 27 also rotates, the drive roller 25 and the feed roller 26 are lowered, and the recording paper roll 8 is moved to the recording paper holding table 24. abuts the bottom of the Furthermore, at this time, the pressure on the thermal head 41 is also released.

Next, in this state, the drive roller 25, the feed roller 26, the capstan roller 9, the platen 2, and the discharge roller 21 are rotated in the forward feeding direction, and the recording paper 7 is conveyed to the cutter 22 and the discharge roller 23. At this time, since the recording paper roll 8 is in contact with the bottom of the recording paper holding member 24,
The movement of the recording paper 7 has a large resistance, and the pinch roller 10 is in relatively weak pressure contact with the capstan roller 9, so the recording paper 7 is pulled by the capstan roller 9 and the pinch roller 10. Capstan roller 9 and pinch roller 1
0 axis direction to remove slack.
This movement in the axial direction causes the recording paper 7 to be pulled out straight, thereby preventing skewed printing.

When the length of the recording paper 7 passing through the platen 2 reaches the length for recording, the recording paper driving roller 25, the feeding roller 26, the capstan roller 9, the pinch roller 10, the platen 2, the transport roller 21, The ejection roller 23 (hereinafter referred to as all rollers) stops, the thermal head 1 is pressed against the platen 2 via the ink sheet 3 and the recording paper 7, and at the same time the cam 19 rotates, and the push rod 16 moves as shown by the arrow. The pinch roller 10 moves in the direction shown, the strong pressure member 14 rotates, the spring 15 pulls the support member 11, and the pinch roller 10 is again strongly pressed against the capstan roller 9 by the spring 13 and the spring 15. .
At the same time, the cam 32 also rotates together with the cam 19,
The roller support plate drive lever 29 rotates, the roller support plate 27 rotates at the same time, the recording paper drive roller 25 and the feeding roller 26 rise, and the first
The state returns to the state shown in the figure.

Next, by rotating all the rollers in the reverse direction and moving the recording paper 7 in the direction shown by arrow E, a recording signal is sent to the thermal head 1, so that the heating resistor element generates heat and the ink on the ink sheet 3 is used for recording. The image is selectively transferred onto the paper 7, and an image is recorded on the recording paper 7. Next, when the rear end of the recording paper 7 reaches the thermal head 1, all the rollers stop rotating.

Next, the pressure contact of the thermal head 1 is released, all the rollers rotate in the forward feeding direction, the end of the portion of the recording paper 7 where the image is recorded is moved to the cutter 22, the recording paper 7 is cut by the cutter 22, and the ejection roller 2
Discharge according to 3.

In this embodiment, the recording paper holding member 24 is fixed to the apparatus, but in the present invention, the recording paper driving roller 25 and the feeding roller 26 that are in pressure contact with the recording paper roller are separated from the bottom of the recording paper holding member 24. Therefore, when using a removable recording paper cassette that holds the recording paper 7 inside, the recording paper cassette can be attached to the device by sliding it in the axial direction of the recording paper roll 8, making recording even easier to operate. You can get the equipment.

Effects of the Invention The present invention provides a recording paper holding member that holds a recording paper roll removably at the bottom, an opening provided at the bottom of the recording paper holding member, and a case where the recording paper is pulled out from the recording paper holding member. Then, the first conveying roller is separated from the recording paper roll, the recording paper roll is moved to a position where it comes into contact with the bottom of the recording paper holding member, and the recording paper pulled out from the recording paper holding member is weakly held. When moving the second conveyance roller to a state where the recording paper is conveyed and returning the recording paper to the recording paper holding member, the first conveyance roller protrudes from the opening and comes into contact with the recording paper roll. means for moving the second conveying roller to a position away from the bottom of the recording paper holding member, and moving the second conveying roller to a state where the recording paper pulled out from the recording paper holding member is strongly gripped and conveyed; When the conveyance roller separates from the recording paper, the recording paper comes into contact with the bottom of the recording paper holding member, and the conveyance resistance of the recording paper increases due to its own weight.Therefore, there is no need to stop the first conveyance roller as in the conventional case, and consumption is reduced. Even if the electric power does not increase and the first conveying roller is brought into pressure contact again, the first conveying roller is not provided with a clutch means or the like, so the recording paper will not become slack again. do not have.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a recording device according to an embodiment of the present invention, and FIG. 2 is a sectional view showing the state during the same operation.
FIG. 3 is a sectional view of a conventional recording device. 7... Recording paper, 8... Recording paper roll, 10...
Pinch roller, 11... Support member, 13... Spring, 14... Strong pressure member, 15... Spring, 16...
Push rod, 19...cam, 24...recording paper holding stand, 25...recording paper drive roller, 32...
cam.

Claims (1)

[Scope of Claims] 1. A recording paper holding member that separably holds a recording paper roll at the bottom; an opening provided at the bottom of the recording paper holding member; and a part that protrudes from the opening and holds the recording paper roll. contact,
The recording paper roll is moved between a first position where the recording paper roll is separated from the bottom of the recording paper holding member and a second position where the recording paper roll is separated from the recording paper roll and comes into contact with the bottom of the recording paper holding member. A possible first conveying roller and a first state in which the recording paper pulled out from the recording paper holding member is pinched and carried, and a first state in which the recording paper is strongly pinched and a second state in which the recording paper is weakly pinched. The second that can be taken
a conveyance roller; when pulling out the recording paper from the recording paper holding member, the first conveyance roller is moved to a second position, the second conveyance roller is moved to a second state, and the recording paper is moved to a second position; The apparatus further comprises means for moving the first conveyance roller to a first position and shifting the second conveyance roller to a first state when returning the recording paper to the paper holding member. Recording device.