JPS6073874A - Conveyor - Google Patents

Abstract

PURPOSE:To enable the titled apparatus to become compact and to attain the reduction in power consumption, by providing a brake means for temporarily imparting frictional brake to an object to be conveyed during conveying by bringing the high friction part thereof into pressure contact with said object. CONSTITUTION:A brake means 21 is provided between an aligning roller pair 15, 15 and a platen roller 4 and constituted of a friction plate 71 and a brake plate 52 as a press plate contacted with and separated from said friction plate 71. The brake plate 52 is fixed to a shaft 53 by a screw 54 and the shaft 53 is supported by frames 56, 56 through bearings 55, 55. In addition, the shaft 53 is provided so as to be swung to a direction B-B' by a rotary solenoid 58 and the friction plate 71 is molded by a leaf spring 60. When an image is formed, paper Pa (Pb) is supplied from a paper supply cassette 3 or a manual insert tray 17 and sent to the aligning rollers 15, 15 through a paper guide path 23 or 26 and receives positional alignment before sent to the side of the platen roller 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a conveyance device included in, for example, a line color printer.

[Technical background of the invention and its problems]

Generally, as shown in FIG. 1, a line color printer has a platen roller 2a that supports paper P, and prints by bringing a thermal head C into pressure contact with the paper PK of this platen roller a via an ink ribbon b. It has become.

After the paper P is fed from the aligning loaf hXh, it is tied between the paper feed side pinch roller d that is pressed against the platen roller a, and then the ink ribbon b
is guided by the platen roller a through the printing point A.
The paper is conveyed until it is pinched by the pinch roller f on the paper discharge side.

By the way, the leading edge of the paper P being conveyed hits the paper ejection side pinch roller f as shown by the dashed line, and is then thrown around the outer periphery of the paper ejection side pinch roller f, and then hits the platen roller a and the paper ejection side pinch roller. It is caught between the contacts of f. In this case, the conveyance path between the two points from the printing point A on the paper P to the contact point A' between the platen roller a and the paper ejection side pinch roller f is longer than the distance on the circumference of the platen roller a between these two points. The long length causes the paper to bend as shown in the figure, causing printing misalignment.

Therefore, conventionally, a gate g is provided between the aligning rollers h, h and the pinch roller d on the paper feed side, and this gate g is connected to the platen roller a and the ejector where the leading edge of the paper P is pressed against the platen roller a. The paper side pinch roller f is pinched, the rear end side is pinched by the aligning rollers h and 11, and the paper feed side pinch roller d is separated from the thermal head a, as shown by the solid line arrow B. When moving in the direction, the paper P is moved by the asining roller h.

For example, a tension T is applied between the h1 platen roller a1 and the paper discharge side pinch roller f, and at the same time, the waste paper P wound around the platen roller a is stretched by the tension T, so that the deflection is removed.

However, in the conventional type, when the force pushing up the paper P at the gate g is N, the magnitude of the tension T that acts to remove paper distortion is T = N sin θ, and the value of the tension T is 30
0 to 40 (Ig), so for example, if θ is considered to be 30°, N = T -600 to 800 g, resulting in a large force sin θ loss. Therefore, in order to increase the tension T, the gate g is When a configuration like the third one using a low-clean lensoid i for movement is used, it is often necessary to increase the current flowing through the rotary solenoid i or to increase the rotary solenoid °i in order to increase T.

In this case, when the current flowing through the rotary solenoid i is increased, the temperature of the rotary solenoid i 75E rises, causing the output to fluctuate, resulting in variations in the magnitude of the tension T, a significant decrease in the reliability of paper straightening, and a decrease in the rotary solenoid l. The problem with making the aircraft more compact when it needs to be made larger is β.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and its object is to provide a conveying device that can apply sufficient tension to paper with a small amount of power.

[Summary of the invention]

In order to achieve the above object, the present invention has devised an indicator braking means that temporarily applies pressure to the image forming object being conveyed by the conveying member on the paper feeding side. It is something.

[Embodiments of the invention]

An embodiment of the invention shown in FIGS. 4 to 9 will be described below with reference to FIG. 1. FIG. 1 is the device itself,
A paper discharge tray 2 is disposed on one side of the main body 1 of the apparatus, and a cut paper supply cassette 3 is disposed on the rear side thereof. A platen ruler 4 as a support is provided at a position corresponding to the loading section of the paper discharge tray 2 in the apparatus main body 1, and a shaft of the platen roller 4 is provided below the platen roller 4. A heating section (not shown) is formed in the shape of a line tod in the direction, and a thermal head 5 is provided.

Further, within the apparatus main body 1, a ribbon storage section 7 that stores a roll-shaped thermal transfer ribbon 6 as a thermal transfer material in a manner that allows it to be fed out;
A one-noon winding section 8 is provided that sequentially winds up the thermal transfer ribbon 6 fed out from the ribbon storage s7.

Then, the thermal transfer ribbon 6 is wound around the roll C8; 1Z) 9 of the ribbon storage section 7 and fed out, and then wound around the first and second ribbon guides 10 and 11 in sequence and placed on the platen row 24.
and the thermal head 5, and then turned back so as to suddenly leave the platen roller 4 via the third ribbon guide 12, and then passed to the fourth ribbon guide °13.
The roll (winding core) of the ribbon winding section 8 in a state where it is wound on
It is configured to be wound up into 14 pieces.

On the other hand, as shown in FIG. 3, a pair of aligning rollers 15 and 15 are disposed in the upper IS rear VCI of the platen roller 4, and a pair of aligning rollers 15. The cut paper Pa1 as a transferred material (recorded material) and the cut paper Pb inserted from the manual feed tray 12 provided at the rear of the paper ejection tray 2 and fed via the manual feed loan pair 18 and 18.
, and a pinch as a conveying member on the paper feeding side arranged to roll the roll paper Pc supplied from the roll paper supply cassette 19 described later which can be replaced with the upper 6α cut paper supply cassette 3 to the platen roller 4. It is configured to be fed between the roll 20 and the roll 20.

A braking means 21 is provided between the aligning roller pair 15.15 and the platen roller 4. Furthermore, the cassette loading section 22 and the aligning roller pair 15.1
5 to form a paper guide path 23 for guiding cut paper Pa or roll paper pc. A second guide plate 24.25 is arranged. Further, between the pair of manual feed rollers 18.18 and the pair of aligning rollers 15.15, a second and third guide plate 27.28 is provided to form a manual paper guide path 26 for guiding the manual paper pb. It is located.

Further, in a portion corresponding to the pair of paper ejection rows 29.29, a sheet Pa is fed out from between the platen row 24 and a pinch roller 30 as a transport member on the paper ejection side that rolls into contact with the platen row 24.
The fifth. A sixth guide plate 32,33 is arranged. Further, between the paper ejection side paper guide path 31 and the manual paper guide path 26, there is a cut it P a or manual paper pb fed from between the paper feed side pinch roller 20 and the platen roller 4.
A return paper guide path 34 is formed between the paper discharge tray 2 and the manual feed tray 17. This return paper guide path 34 is the seventh. Eighth guide plates 35 and 36
It is formed by mutually opposing surface parts of.

Furthermore, a light emitter 37 and a light receiver 3 are provided on the upstream side of the ribbon tensioning path.
8, a paper detector (paper feed sensor) 40 is provided near the aligning roller pair 15,' 15, and a paper sensor (paper feed sensor) 40 is provided near the paper ejection side pinch roller 3o. A tip detector 41 is provided respectively.

In FIG. 1, 42 is a display/operation input unit, 43 is a pulse motor as a main drive source, and 44 is a paper pulse motor.
45 is a hull smoker for manual paper feeding, and 46 is a pulse motor for ribbon winding. 47.48 is a plunger type solenoid that moves the paper feed side pinch roller 2θ and the paper discharge side pinch roller 3o toward and away from the platen roller 4.
49 is the power supply section, and 50 is the J-control section.

Next, the instruction means 21 will be explained in detail.

As shown in FIGS. 6 to 9, this braking means 21 is composed of a friction plate 71 and a pre-pull plate 52 as a suppressing plate that comes into contact with and separates from the friction plate 71. The brake plate 52 is fixed to a shaft 53 by a screw 54, and the shaft 53 is supported by a frame 56.56 via a bearing 55.55. 57 is a joint. The shaft 53 is connected to a rotary solenoid 58, and is swung in the direction B-B' by the rotary solenoid 58.

Further, the friction plate 71 is formed by a leaf spring 60,
A rubber material 6) serving as a high-friction part is molded on the tip end thereof in the width direction.

Further, the leaf spring 60 has a thickness of about 0.2u and has an opening 60a in its center so that it can be sufficiently twisted in the DD' direction under a light load. The friction plate 71 is supported by a support plate 62, and a holding piece 63 is cut and formed at the center of the distal end of the support plate 62. The central portion of the rubber material 61 is held by this holding piece 63.

During image formation, paper pa (Pb) is supplied from the paper feed cassette 3 or the manual feed tray 17, and passes through the paper guide path 23 or 26 to the aligning row 215.
, 15, and after being aligned there, it was transferred to platen row 2.
Sent to the 4th side. At this time, the paper P a (Pb) is detected by the paper detector 40, and this detection activates the solenoid 51, causing the thermal head 5 to rotate clockwise and away from the platen roller 4, and the platen roller 4 to rotate. be done.

As a result, the leading edge of the paper p a (pb) is first introduced between the platen roller 24 and the pinch roller 220 on the paper feed side, and is conveyed, and while being guided by the ink ribbon 6, the paper p a (pb) is guided by the platen roller 4 and the pinch roller on the paper ejection side. 30 and is conveyed, and its tip is detected by a detector 41. Upon this detection, the solenoid 51 is activated, the thermal head 5 is pressed against the paper P a (Pb) via the ink ribbon 6, and the platen roller 4 and the roller 14 of the ribbon winding section 8 are rotated, and the paper P a (Pb) and the ink ribbon 6 are conveyed by a predetermined amount and the first color yellow is printed. After the printing of the i1th color is completed in this way, the solenoid 51
As a result of the operation, the thermal head 5 is rotated clockwise and separated from the platen roller 4, and the platen roller 4 is also rotated in the opposite direction, so that the paper pa (Pb) is conveyed in the reverse direction and its leading edge is connected to the platen roller 4 and the paper ejection side. It is stopped when it reaches position 1' between it and Vintilonilla 30. Thereafter, the thermal head 4 is raised again by the operation of the solenoid 5 and is brought into pressure contact with the platen roller 4, and the platen roller 4 and the roller 14 of the ribbon winding section 8 are rotated, and the paper Pa (Pb) and the ink ribbon 6 are rotated. is conveyed by a predetermined amount, and then the second color, magenta, is overprinted. Thereafter, cyan is printed overlappingly in the same manner, resulting in multicolor printing.

The paper p a (Pb) on which multicolor printing has been performed in this manner is discharged to the paper discharge tray 2 via the paper discharge side paper guide path 31 and the paper discharge rollers 29 29 .

By the way, when the paper pa, pb is supplied during this printing and the leading edge of the paper is pinched between the platen roller 4 and the pinch roller 30 on the paper discharge side, the pinch roller 20 on the paper feed side and the thermal head 5 are Solenoid 4B, 47
．． 51 moves the paper P a (Pb) away from the platen roller 4 , and the rotary solenoid 58 operates to rotate the brake plate 52 of the braking means 21 in the direction of arrow B, and the tip of the brake plate 52 pushes the paper P a (Pb) against the friction plate 7 . rubber material 61
to suppress. From this state, paper P a (Pb
) is conveyed approximately 51 mm in the paper discharge direction, and due to the pinching pressure between the brake plate 52 and the rubber material 61 of the friction plate 71, a frictional force F-μN (N: perpendicular to the surface of the rubber material 61) is applied in the opposite direction to the conveyance direction. Resistance, μ: force, is the sum of the rubber material 6) and the dynamic friction coefficient of the brake plate 52. This frictional force is the paper pa (Pb
) to the paper feed side, and as a result, the paper P a
(Pb) is deflected from the brake plate 52 and the rubber material 6 of the friction plate 7 between the pressing portions of the platen roller 4 and paper discharge side pinch roller 3θ, and is subjected to tension F-μN. After this, the paper feed side pinch roller ?
0 and the platen roller 4, the paper P
a(Pb') is in a stretched state with a tension of at least F without bending. Thereafter, the thermal head 5 is pressed against the platen roller 4 by the operation of the solenoid 51, and the rotary lean lens 58 is rotated in the direction of arrow B', the brake plate 52 is separated from the rubber material 6 of the friction plate 71, and overlapping printing is performed. is started.

In this way, since printing is performed while tension is applied to the paper P a (Pb), occurrence of color shift due to paper bending is prevented.

As described above, since the paper Pa (Pb) is brought into pressure contact with the rubber material 61 of the friction plate 7, sufficient braking force can be provided even if the pressing force of the brake plate 52 is small. Big @ things are not mandatory.

Note that when the brake plate 52 is pressed against the rubber material 61 of the friction plate 71, if the rubber material 61 is pressed with an unrestricted force in the width direction, the rubber material 61 becomes a support plate depending on the strength. 6
It moves in the DD direction centering on the holding piece 63 of No. 2. Therefore, the pressing force on the rubber material 61 always acts in an evenly distributed manner, and skew of the paper P a (PLY) and misalignment of printing can be reliably prevented.

〔Effect of the invention〕

As explained above, the present invention is equipped with a braking means that applies frictional braking by temporarily press-contacting a high-friction part to the conveyed object. The pressing force on the liquid carrier can be reduced.Therefore, a large-sized drive source for the braking means is not required, making it possible to downsize the brake means and reduce power consumption, resulting in an economical effect.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an image forming unit as a first conventional example, Section 2 is a configuration diagram showing an image forming unit as a second conventional example, and Fig. 31 is a perspective view showing its gate. , Figures 4 to 9
The drawings show a simple embodiment of the present invention, in which Fig. 44 is a schematic configuration diagram showing the printer, Fig. 5 is a detailed enlarged view of a part thereof, Fig. 6 is a side view showing the braking means, FIG. 7 is a perspective view showing the brake plate, FIG. 8 is a perspective view showing the friction plate, and FIG. 9 is a front view thereof. pa, pb...Transported object [paper], 4. °° support (platen roller), 20... Supply side conveyance section (pinch roller), 30... Paper discharge side conveyance member (pinch 0 −”
i), 61...Takama WA m ("mu material), 2J...
- Braking means. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 7 Figure 6 Figure 8 Commissioner of the Patent Office Kazuo Wakasugi 1, Patent Application for Indication of Case No. llR58-i82690 No. 2, Name of Invention Transport 3 Relationship between the person making the amendment and the case Patent originator (3(I') Tokyo Shibaura Electric Co., Ltd. 4, Agent 7, Yamatani making the amendment)

Claims (3)

[Claims] (1) A support body that supports a conveyed object; a supply side that is disposed on both sides of the support body and comes into pressure contact with the conveyed body, and that conveys the conveyed body by pinching it between the supports; It is characterized by comprising a conveying member on the paper discharge side, and a braking means provided near the conveying member on the supply side and applying frictional braking by temporarily bringing a high friction portion into pressure contact with the conveyed object. Conveyance device for (2) When the conveying member on the paper discharge side pinches the conveyed object, the pinching pressure by the conveying member on the supply side is released, and frictional braking is applied to the conveyed body to convey it. The conveyance device according to claim 8g1. (3) The braking means includes a friction plate and a suppression plate that is brought into contact with and separated from the friction plate, and the friction plate is movably supported so as to uniformly receive the pressing force of the suppression plate. A conveying device according to claim 1 or 2, characterized in that: