JPH0281853A - Mechanism for feeding sheet - Google Patents

Abstract

PURPOSE:To lower the vibration of a sheet material and noise in the feeding mechanism of a printer, etc., by providing a contact member which is brought into contact with a part of or the whole width of a fed sheet material. CONSTITUTION:A contact member 12 made of an elastic material is provided between a roll holder 2 and a platen roller 3a, while being installed on a cutout 13a provided nearly in the center in the width direction of a lower guide portion 13 integrally formed with the roll holder 2. The contact member 12 is projected out above the guide face of the lower guide portion 13 and brought into contact with the backside of a recording sheet 1 fed from a sheet roll 1a to the platen roller 3a to energize same. Hence, the contact member 12 is brought into contact with the sheet 1 always in a contact condition irrespective of the diameter of a sheet roll 1b, suppressing the vibration of the sheet while preventing noise.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a sheet material feeding mechanism used in facsimiles, printers, and the like.

<Prior Art> Today, facsimiles and the like are widely used, and these recording methods generally use a thermal recording method.

This recording method is shown in Figure 9 (thermal recording sheet 1-5).
A sheet roll 50a wound into a roll is loaded into a holder 51, and this recording sheet 50 is transferred to a recording head 52.
A and a platen roller 52b constitute the recording section 52, where recording is performed. That is, the recording sheet 50 is conveyed by rotating the platen roller 52b, and a predetermined image is recorded on the recording sheet 50 by causing the recording head 52a to generate heat in an image pattern in synchronization with this.

<Problem to be solved by the invention> However, in the above configuration, the recording sheet 5 to be fed
The recording sheet 50 is supported only at two points: the unreeled sheet roll 50a and the platen roller 52b, and therefore the recording sheet 50 between them 50a and 52b is unstable against vibrations. In particular, when the recording sheet 50 is consumed and the sheet roll diameter becomes smaller, the weight of the roll 50a becomes lighter, and the bank tension when the recording sort 50 is conveyed by the platen roller 52b becomes weaker. Then, there is a problem in that minute vibrations caused by the platinum roller 52b, minute sliding vibrations between the sheet roll 50a and the holder 51, etc. vibrate the entire sheet surface of the recording sheet 50 being conveyed, and generate noise. Ta.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet feeding mechanism capable of solving the above-mentioned conventional problems, reducing vibrations generated in the sheet material being fed, and suppressing noise caused by the vibrations. It is.

<Means for solving the problem> The means for solving the problem described above includes a feeding means for feeding the sheet material, and a feeding means for feeding the sheet material over a part or the entire width of the sheet material fed by the feeding means. It is characterized in that it is provided with an abutting member for abutting against it.

Effects> According to the above means, the sheet material comes into contact with the contact member during its feeding. Therefore, the vibration mode of the sorted material generated by feeding is divided into a plurality of parts by the abutting member and cancel each other out, or the vibration of the sheet material itself is reduced.

Therefore, noise caused by the vibration is suppressed.

<Embodiment> Next, an embodiment in which the above means is applied to a facsimile machine will be described.

[First example]

FIG. 1 is an explanatory cross-sectional view of the entire facsimile apparatus, and FIGS. 2(A) and (B) are explanatory views of the recording sheet feeding mechanism.

First, the overall structure of the apparatus will be explained. Reference numeral 1 is a thermosensitive recording sheet that develops color by applying heat. A long sheet is wound into a roll, and the sheet roll 1a is stored in a drop-in type roll holder 2. .

An image is recorded on the recording sheet 1 in a recording section 3, which will be described later, and the recorded sheet 1 is guided to a counter 4, cut from the trailing edge of the image, and stacked on a reversing tray 6 by a discharge roller 5. It is configured.

Reference numeral 7 denotes a document reading section, in which the documents 8 stacked on the top cover are separated one by one by a pre-aia feed roller 7b in pressure contact with a separation pressing piece 7a and a separation roller 7d in pressure contact with a separation pressing piece 7C, and further pressed. The original is transported by a transport roller 7r in pressure contact with a roller 7e, and a light source 7g irradiates the document surface with light, and the reflected light is sent to a CC via a mirror 7h and a lens 7I.
The image signal is sent to the photoelectric conversion element 7j such as D, and in the case of the copy mode, the image signal is sent to the own recording unit in the facsimile mode (
In the case of (transmission mode), the configuration is such that the data is transmitted to the recording section of another device.

The configuration of the recording section 3 is such that a platen roller 3a driven by a motor (not shown) is provided on the main body 9 side of the apparatus, and a recording roller 3b in which heat generating elements that are individually energized and generate heat according to image signals are arranged in a row is connected to a cover lO. It is located on the side. The lid lO is configured to be openable and closable with respect to the main body 9 of the apparatus around an axis ti, and is configured such that when the lid 10 is closed, the recording pad 3b presses the platen roller 3a by a pressing spring 3C. are doing.

Therefore, the recording sheet 1 is set between the platen roller 3a and the recording head 3b, and in this state, the platen roller 3a is rotated in the direction of arrow A, and in synchronization with this, the heating element generates heat in accordance with both signals. Record sheet l
Images are recorded on the .

Further, a mechanism for preventing vibration of the recording sheet 1 is provided in the recording sheet conveying path between the sheet roll 1a and the platen roller 3a. Here, to explain the mechanism, it is a feeding path of the recording sheet 1, and a contact member 12 is provided between the roll holder 2 and the platen roller 3a.
is installed. This contact member 12 is shown in FIG.
, As shown in (B), a notch 13a is formed approximately at the center in the width direction of the lower guide portion 13 of the recording sheet l which is integrally constructed with the roll holder 2, and the notch 13a is made of an elastic material (
A contact member 12 made of, for example, stainless steel strip is attached. The contact member 12 is formed to protrude upwardly from the guide surface of the lower guide portion 13, and its elastic force allows the contact member 12 to move from the sheet roll la to the platen roller 3a.
energizes the back side (the side opposite to the side to be recorded) of the recording sheet 1 that is being fed. Therefore, as shown in FIG. 2(A), the contact portion JiA'12 always contacts the recording sheet 1 in a constant state regardless of the diameter of the sheet roll la.

As mentioned above, from the shift roll la to the platen roller 3a
When the contact member 12 comes into contact with the recording sheet l being fed, the vibration mode of the recording sheet l is divided into several parts during the feeding, and the vibrations of the respective parts cancel each other out. Therefore, when the recording sheet 1 is fed, the vibration of the recording sheet 1 and the noise caused by it are greatly reduced.

Further, in the above configuration, the contact member 12 is a recording sheet)
Since the recording surface is brought into contact with the back surface of the recording surface, there is no inconvenience such as the recording surface being damaged by the contact member 12.

[Second example]

In the first embodiment, the contact member 12 is shown in FIG.
Although the abutting member 12 is disposed on the apparatus main body 9 side as shown in FIG. You can get the effect.

Furthermore, in this case, when the user opens the lid 10 when setting the recording sheet l or clearing a jam, the recording head 3
The contact member 12 is retracted upward together with b. Therefore, it is possible to easily set the recording sheet 1, clear jams, etc.

[Third Example]

Further, as another embodiment in which the contact member is disposed on the lid body 10,
It may be configured as shown in FIG.

The structure of the abutting member 14 shown in FIG. 4 is such that one end of a pair of rotating arms 14b arranged in the width direction of the recording sort l is rotatably attached to a shaft 14a provided on the lid body 10. A roller 14c is attached to the other end of 14b.

The roller 14c attached to the rotating arm 14b is
It comes into contact with the recording sheet l that is fed from the sheet roll la to the platen roller 3a due to its own weight.

Therefore, even with the above configuration, the vibration of the recording sheet l being fed can be effectively reduced.

In this embodiment, even if the diameter of the sheet roll 1a becomes smaller, the force due to the weight of the roller 14c is applied to the recording sheet.
Join 1. Therefore, recording sheet l has sheet roll 1.
The rollers 14c abut against each other with a constant force from the beginning of use to the end of use, and the vibrations of the recording sheet 1 are always stably reduced.

Further, the roller 14c comes into contact with the surface (the surface to be recorded) of the recording sheet 1, but since the roller 14c rotates as the recording sheet 1 is fed, the recording surface is not damaged. be.

[Fourth Embodiment] In the first to third embodiments described above, an example was shown in which the abutting member is always in contact with the recording sheet 1 being fed, but the vibration of the recording sheet 1 being fed is , as the diameter of the sheet roll la becomes smaller, it tends to become more intense after a certain point. Therefore, as a fourth embodiment, sheet roll 1a
FIG. 5 shows an example in which the contact member contacts the recording sheet 1 when the diameter of the contact member becomes smaller.

In this embodiment, as shown in FIG. 5, an abutment member 15 is attached to the end of the lower guide portion 13. This contact member 15
is a sheet-like member made of polyester sheet or the like that can be deformed with a weak force, and is attached to the upper end of the roll holder 2 so as to protrude inward.

When the diameter of the sheet roll 1a is large, the contact member 15 does not contact the recording sheet 1 as shown by the solid line in FIG. 5, but when the recording sheet 1 is fed out and the diameter of the sheet roll 1a becomes small, the recording The back surface of the sheet 1 is the contact member 1
5, and the member 15 is deformed as shown by the dashed line in FIG.

Therefore, when the diameter of the sheet roll la becomes smaller and vibrations are more likely to occur in the recording sheet 1, the contact member 15 contacts the recording sheet 1 to reduce the vibrations.

In the above configuration, the recording sheet 1 to be fed is simply configured by simply attaching the sheet-like member to the lower guide portion 13a.
It becomes possible to effectively reduce vibration and noise.

[Other Examples]

In the first to fourth embodiments described above, an example was shown in which one abutment member was provided, but a plurality of abutment members may be provided. In particular, when the vibration of the recording sheet l is irregular, the irregular vibration can be effectively reduced by arranging the plurality of abutting members so as to be slightly shifted from each other. Furthermore, irregular vibrations can be effectively reduced by widening the width of the abutting member so that it abuts over the entire width of the recording sheet l.

Further, in the embodiment described above, when the platen roller 3a rotates, the recording sheets 1 are sequentially fed out from the sheet roll la, but as shown in FIG.
It goes without saying that the same application is possible even in a configuration in which the paper is fed by the feed roller 16 and transported by the platen roller 3a. In this case, as shown in FIG. 7, the contact members shown in the first to fourth embodiments may be combined.

Further, in each of the embodiments described above, a roll sheet is used as the recording sheet l, but as shown in FIG. The same applies to any configuration.

<Effects of the Invention> As described above, in the present invention, since a part or the entire width of the sheet material fed by the feeding means comes into contact with the contact member,
With a simple configuration, it is possible to reduce the vibration mode of the sheet material generated by feeding, and it is possible to suppress noise caused by the vibration.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram of a facsimile machine according to an embodiment of the present invention, FIGS. 2(A) and (B) are cross-sectional explanatory diagrams and perspective explanatory diagrams of a sheet feeding mechanism, and FIG. 3 is a contact member. 4 is an explanatory diagram of an embodiment in which the contact member is brought into contact with the recording sheet by its own weight, and FIG. 5 is an explanatory diagram of an embodiment in which the contact member is brought into contact with the recording sheet by its own weight. FIG. 6 is an explanatory diagram of an embodiment in which a contact member contacts a recording sheet, FIG. 6 is an explanatory diagram of an embodiment with a feed roller, FIG. 7 is an explanatory diagram of an embodiment in which multiple types of contact members are provided, and FIG. 8 Day 9 is an explanatory diagram of an embodiment using 7 force points, and Day 9 is an explanatory diagram of a conventional technique. 1 is a recording sort, la is a sheet roll, 2 is a roll holder, 3 is a recording section, 3a is a platen roller, 3b is a recording head, 3C is a pressing spring, 4 is a canter 15 is a discharge roller, 6 is a reversing tray 7 Document reading section, 7a is a separation pressure piece, 7b is a preliminary conveyance roller, 7C is a separation pressure piece, 7d is a separation roller, 7e is a pressure roller, 7r is a conveyance roller, 7g is a light source, 7h is a mirror, 71 is a lens, 7j 8 is a photoelectric conversion element, 8 is a document, 9 is a device main body, 10 is a lid body,
11 is a shaft, 12 is a contact member, 13 is a lower guide portion, 13a
14 is a notch, 14 is a contact member, 14a is a shaft, 14b is a rotating arm, 14c is a roller, 15 is a contact member, 16 is a feed roller, 17 is a cassette, 18 is a cant sheet, 19
2 is a pickup roller, and 20 is a conveyance row. Figure 3 Figure 4

Claims (2)

[Claims] (1) A feeding device for feeding a sheet material, and an abutting member for abutting a part or the entire width of the sheet material fed by the feeding device. sheet feeding mechanism. (2) The sheet material is a roll sheet obtained by winding a long sheet into a roll shape, and the contact member is configured to contact the fed sheet material when the winding diameter of the roll sheet becomes small. The sheet feeding mechanism according to claim (1).