JPH05278936A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To eliminate uneven delivery by providing a pair of delivery rollers in the upstream part in a carrying direction from carrying rollers, and detectiang sagging at a clearance part between the carrying roller and the delivery rollers for collecting the feed motion of the pair of delivery rollers. CONSTITUTION:At the same time when a facsimile equipment 11 starts printing, a platen roller 4 and a pair of delivery rollers 12 start rotating to carry a sheet 2 to be recorded. At this time, because the peripheral speed of the pair of delivery rollers 12 is little higher than that of the platen roller 4, the sagging 2A of a sheet A to be recorded is generated between the rollers 4, 12, and the sagging 2A enters the clearance 13 to move downwards with the passage of time. When the sagging 2A lowers to a position where the sagging is detected by a recorded sheet sensor 15, the rotation of the pair of delivery rollers 12 is stopped for a certain time based on the output from the recorded sheet sensor 15 through a control part. Under this condition, the sheet 2 to be recorded in the clearance 13 is carried, and after a certain time passes, the pair of delivery rollers 12 are rotated again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine, for example, a facsimile machine having a recording paper conveying device for printing image information on a recording paper while conveying the recording paper.

[0002]

2. Description of the Related Art As a conventional facsimile apparatus, for example, Japanese Utility Model Laid-Open No. 60-59673 and Japanese Utility Model Laid-Open 60-59-
There is one as described in Japanese Patent No. 57263. The former is one in which the recording paper is pulled out directly from the recording paper roll to the recording head by the platen roller. Further, the latter has a feeding roller for feeding the recording paper upstream of the feeding roller in the feeding direction, but the feeding roller is not specially controlled.

An example of such a conventional facsimile apparatus is shown in FIG. 2 (a). The facsimile apparatus 1 shown in FIG. 2A is one in which the recording paper 2 is directly pulled out from a storage box 3 for storing the roll-shaped recording paper 2 by a platen roller 4, and the recording paper 2 pulled out is the platen roller 4. Is printed on the lower surface of the thermal head 5 which comes into contact with. The platen roller 4 is driven by a timing belt 6A stretched between shafts of a motor 6 provided inside the apparatus main body 1A. A discharge roller 7 is driven by the timing belt 6A which is wound around the shaft of the motor 6 like the platen roller 4. A pressing roller 8 presses the recording paper 2 between the pressing roller 8 and the discharge roller 7 and discharges the recording paper 2 to the outside of the apparatus. 9 is a cutter. The pressing roller 8 and the thermal head 5 are attached to the upper cover 1B on the upper side of the apparatus body 1A.
It can be opened and closed centering on the hinge 1C at the end of the.

[0004]

However, in such a conventional facsimile apparatus, since the thermal head 5 uses the elastic member, as shown in FIG. When the recording paper 2 is conveyed by the platen roller 4 which is in contact with the lower surface of the head 5, the recording paper 2 has a conveyance force F _{1 in} the conveyance direction by the platen roller 4 and a frictional force due to the roll-shaped recording paper 2 and the like in the conveyance direction. A resistance force F ₂ toward For this reason, the conveyance amount of the recording paper 2 largely deviates from the ideal line R as shown in FIG. 2C and changes like the actual line H, and so-called uneven conveyance occurs, so that the printing on the recording paper 2 is performed. There is a problem that unevenness occurs.

The present invention has been made against the background of such a conventional problem, and a feed roller pair is provided on the upstream side in the feeding direction from the feed roller, and the recording paper being fed between the feed roller and the feed roller pair. A recording paper sensor for detecting the slack of the recording paper is provided on a space portion having a space capable of accommodating a part of the space and a side wall of the space portion, and by conveying the recording paper while controlling the recording paper, the load on the conveyance roller is reduced, An object of the present invention is to provide a facsimile apparatus capable of obtaining a stable and clear image without unevenness in conveyance and uneven printing.

[0006]

According to a first aspect of the present invention, there is provided a facsimile apparatus for printing on a recording sheet while the recording sheet is being conveyed to a recording section by a conveying roller, and a conveying direction of the recording sheet from the conveying roller. A feed roller pair that is provided upstream to feed the recording paper to the conveying roller side faster than the conveying speed of the conveying roller, and a space formed between the feeding roller pair and the conveying roller to accommodate a part of the recording paper being conveyed. And a recording paper sensor provided on the side wall of the space for detecting the slack of the recording paper. When the recording paper sensor detects the recording paper, the feed roller pair is fed for a certain period of time. It is characterized by stopping.

[0007]

According to the first aspect of the invention, the recording sheet is sent to the conveying roller side by the feed roller pair, and is further printed on the recording sheet while being conveyed to the recording section by the conveying roller. Since the transport speed of the feed roller pair is faster than the transport speed of the transport roller, the recording sheet sags between the feed roller pair and the transport roller, and the slack in the space increases. When the recording paper sensor detects slack in the recording paper, the feed roller pair stops for a certain period of time, and during this stop, the transport rollers continue to feed the recording paper, causing a certain amount of slack in the recording paper. The carrying roller only pulls up and carries the slackened recording paper in the space, and the load on the carrying roller is reduced.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a facsimile apparatus according to claim 1 of the present invention. The same components as those of the conventional one shown in FIG. First, the configuration will be described. In FIG. 1, reference numeral 11 denotes a facsimile apparatus, and the facsimile apparatus 11 is a pair of feed rollers for feeding the recording paper 2 to the platen roller 4 side at a position separated from the platen roller 4 which is a conveyance roller to the upstream side in the conveying direction of the recording paper 2. Have twelve. The peripheral speed of the rollers of the feed roller pair 12 is higher than that of the platen roller 4, and
Reference numeral 12 conveys the recording paper to the platen roller 4 side at a conveyance speed higher than that of the platen roller 4. Feed roller pair 12
Between the platen roller and the platen roller, there is provided a space portion 14 having a space 13 that expands downward and can accommodate a slack 2A of a part of the recording paper 2 when the recording paper 2 being conveyed sags. There is. A recording paper sensor 15 for detecting the slack 2A of the recording paper 2 is provided below the side wall 14a of the space 14. The recording paper sensor 15 is connected to the feed roller pair 12 via a control unit (not shown), and when the control unit receives a detection signal of the slack 2A of the recording paper 2 from the recording paper sensor 15, for example,
By controlling a clutch or the like, the rotation of the feed roller pair 12 is stopped for a fixed time, and the feeding of the recording paper 2 by the feed roller pair 12 is stopped.

Next, the operation will be described. At the same time when the facsimile device 11 starts printing, the platen roller 4 and the feed roller pair 12 start rotating, and the recording paper 2 is conveyed. Here, since the peripheral speed of the rollers of the feed roller pair 12 is slightly higher than the peripheral speed of the platen roller 4, the slack 2A of the recording paper 2 is formed between the platen roller 4 and the feed roller pair 12, and sags with the lapse of time. 2A increases. Since the space portion 14 having the space 13 is provided between the platen roller 4 and the feed roller pair 12, the slack 2A of the recording paper 2 enters the space 13 and the slack 2A is accommodated as the slack 2A increases. , Increases below the space 13. The lower end of slack 2A is a space
When the recording paper sensor 15 moves down to the position of the recording paper sensor 15 in 13, the recording paper sensor 15 detects the slack 2A and sends a detection signal to the control portion, and the control portion stops the rotation of the feed roller pair 12 for a certain period of time. When the feed roller pair 12 is stopped, the platen roller 4
Continues to rotate and conveys the recording paper 2, so that the slack 2A of the recording paper 2 in the space 13 continues to decrease for a certain period of time.
After a certain period of time, the feed roller pair 12 starts to feed the recording paper 2 again, the slack 2A of the recording paper 2 in the space 13 increases, and when the recording paper sensor 15 detects the end of the slack 2A again, the feed roller pair 12 will stop again. Ie space
The slack 2A of the recording paper 2 inside the space 13 holds the range of increase or decrease of the slack 2A within the space 13 for a certain time. Therefore, the tension of the recording paper 2 applied to the transport roller 4 toward the recording paper 2 is
The present invention is applicable only to pulling up the recording paper 2 in the space 13, and the load applied to the platen roller 4 can be greatly reduced as compared with the case of directly pulling out the conventional recording paper 2 in roll form. Therefore, the load of the recording paper 2 applied to the platen roller 4 is small, the platen roller 4 rotates stably, the recording paper 2 is conveyed to the lower surface of the thermal head 5 which is a recording unit, and the recording paper 2 is stabilized on the recording paper 2. The image is printed, and a clearer image can be obtained.

[0010]

As described above, according to the present invention as set forth in claim 1, the feed roller pair is provided on the upstream side of the feed roller in the feed direction, and the recording paper being fed between the feed rollers. A recording paper sensor for detecting the slack of the recording paper is provided on a space portion having a space capable of accommodating a part of the space and a side wall of the space portion, and by conveying the recording paper while controlling it, the load on the conveyance roller is reduced, It is possible to obtain a stable and clear image free from uneven transportation and uneven printing.

[Brief description of drawings]

FIG. 1 is a schematic front view of an embodiment of a facsimile apparatus according to claim 1 of the present invention.

2A and 2B are views showing a conventional facsimile apparatus, in which FIG. 2A is a schematic front view thereof, FIG.
Is a graph showing the amount of recording paper conveyed during the operation.

[Explanation of symbols]

 2 Recording paper 2A slack 3 Storage box 4 Platen roller (conveying roller) 5 Thermal head (recording part) 11 Facsimile device 12 Feed roller pair 13 Space 14 Space part 15 Recording paper sensor

Claims (1)

[Claims] 1. A facsimile device for printing on a recording sheet while the recording sheet is conveyed to a recording section by a conveying roller, wherein the recording roller is provided upstream of the conveying roller in the conveying direction of the recording sheet and is conveyed to the conveying roller side. A pair of feed rollers that feed faster than the conveying speed of the recording medium, a space formed between the pair of feed rollers and the conveying roller to form a space that can accommodate a part of the recording paper being conveyed, and a side wall of the space. Is provided,
A facsimile apparatus, comprising: a recording paper sensor that detects a slack of the recording paper; and when the recording paper sensor detects the recording paper, the feeding of the feed roller pair is stopped for a certain period of time.