JP3064484B2 - Facsimile machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus, and more particularly, to a facsimile apparatus capable of reducing the size and weight of the entire facsimile apparatus and having a standby position for holding a read head and a recording head away from a platen roller. Related to the device. Since the present invention is preferably applied to a facsimile apparatus, the term “facsimile apparatus” is simply used in the claims and the description of the specification, but the present invention is not limited to the facsimile apparatus. It is not limited to devices that are commonly referred to as a read head, a print head, or other devices that use both heads, such as image scanners, printers, copiers, PC modems, and even facsimile machines. And a composite device in which these are arbitrarily combined.

[0002]

2. Description of the Related Art A facsimile apparatus includes a transmission structure,
And a receiving structure. The transmission structure generally includes a reading head, a roller driven to convey a document sandwiched between the reading head, a motor and a gear driving the roller, a document guide, and the like. .
On the other hand, the receiving structure generally includes a recording head, a platen roller that is driven to convey the document between the recording head, and a motor and a gear that drives the platen roller.

As described above, in general, a facsimile apparatus includes two motors and two rollers.
However, in order to reduce the size and weight, there has been proposed an apparatus using only one motor as a reading motor and a recording motor. In this case, the switching between the reading operation and the recording operation is performed using an electromagnetic clutch, a one-way clutch or the like. Further, in addition to using one motor for dual use, there has been proposed a motor in which one platen roller is used for both the document conveying roller and the recording roller (Japanese Patent Application Laid-Open No. Sho 62-62).
126765). In the facsimile apparatus disclosed in this publication, switching between the reading and recording operations is performed by driving a small motor, moving the holder to the left and right via a rack and a pinion, and switching the pressure contact of the platen roller with respect to the reading head and the recording head. Is going. In general, a system in which the reading head and the recording head are pressed against the platen roller has a disadvantage that the copying function cannot be performed.

[0004] In each of these prior arts,
At the time of standby for transmission / reception, transportation, storage in a warehouse, or the like, the reading head or the recording head is in a state of being pressed against the roller (or platen roller).

[0005]

As described above, the small size,
Conventional devices that have reduced the weight generally use one motor and two rollers, and ones that use one motor and one roller have been proposed. Since the motor is used, it is practically 2
It can be said that one actuator is used. As described above, in the conventional apparatus, there has not been proposed any apparatus which is reduced in size and weight by using one motor and one roller.

Further, as described above, the read head and the recording head are in pressure contact with the roller (or platen roller) during standby, so if the roller (platen roller) is left in the standby state for a long period of time, The rubber has a drawback of causing plastic deformation, and the rubber of the roller and the read head or the recording head are stuck to each other due to long-term pressing, so that the roller cannot be rotated by the motor. Therefore, conventionally, as a measure against this, before shipping, a tangled paper piece was sandwiched between the rollers and these heads, or the heads were floated from the rollers by sandwiching a plastic wedge (spacer). However, this had the disadvantage that it was only effective initially.

Accordingly, an object of the present invention is to reduce the size and weight and to make the reading head and the recording head stand by separately from the platen roller.
An object of the present invention is to provide a new facsimile apparatus which eliminates the conventional disadvantages, does not require the use of paper pieces, and has no plastic deformation.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a hollow platen roller, and a rotatable roller penetrating through the hollow platen roller at a distance from the hollow platen roller. A camshaft, a cam mounted to at least one end of the camshaft outside the hollow platen roller, and a read head and a recording head disposed around the hollow platen roller in operative relationship with the cam. The cam operation allows the read head and the recording head to be selectively held away from the hollow platen roller, the standby position, the read head only to contact the hollow platen roller, and the recording head only to contact the platen roller. And a facsimile apparatus characterized in that the facsimile apparatus has a receiving position.

Further, the facsimile apparatus can take a copy position where the reading head is brought into contact with the platen roller and the recording head is brought into contact with the platen roller, in addition to the above-mentioned positions.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Referring first to FIG. 1 which shows a perspective view of a facsimile apparatus of the present invention, and FIG. 2 which shows a schematic sectional view of the facsimile apparatus. The facsimile machine 10 has a plate-shaped frame 12, and the frame 12 alone is used to control a motor 14, a reduction gear 16, and a hollow platen roller 4 described in detail below.
0, a reading head 60, a recording head 50, and other main components of the facsimile apparatus of the present invention. Frame 1
The motor 14 supported by 2 is a reversible motor that performs both forward rotation and reverse rotation. The power from the motor 14 is simultaneously transmitted to the hollow platen roller driving gear 18 and the camshaft driving gear 20 via the reduction gear 16 composed of a gear train (see FIG. 2). It should be noted that the configuration shown is merely an example,
Other configurations are possible. For example, the reduction gear 16
May be transmitted to a common shaft having two one-way clutches, and the power may be transmitted to the two one-way clutches via the common shaft. In addition, the operation description described below
The description of the operation performed in connection with the former configuration and in the case of adopting the latter configuration will be omitted because it can be easily understood by those skilled in the art.

The gear 18 is connected to the hollow platen roller 40 via a one-way clutch 22. When the motor 14 is rotated forward, the power from the motor 14 is transmitted to the hollow platen roller 40, and 40
Is rotated in the forward direction. On the other hand, the gear 20 is connected to the camshaft 26 via the one-way clutch 24. When the motor is rotated in the reverse direction, the power from the motor 14 is transmitted to the camshaft 26 to rotate the camshaft 26 in the opposite direction. . Thus, either the hollow platen roller 40 or the camshaft 26 is rotated depending on the rotation direction of the motor 14.

Referring to FIG. 3, which is a partially detailed sectional view of FIG. 2, the hollow platen roller 40 is rotatably supported by a frame 12 via a flange bush 72. And a rubber 44 attached to the surface of the roller core 42. The recording head 5
The read head 60 and the read head 60 are movable radially with respect to the hollow platen roller 40 via a bush 74 and pressure springs 78 and 76 (only one is shown in FIG. 3) disposed at both ends. Installed.

The recording head 50 is normally pressed inward by a pressure spring 78 so as to contact (press) the hollow platen roller 40. For example, a recording head body 52 such as a thermal printing head and the recording head main body 52 are pressed. And a plate 54 attached to the outside of the head main body 52. The plate 54 is provided at both ends with portions 56 and 58 forming cam followers for performing a cam action with the cams 30 and 32 described later.
(See FIGS. 1 and 2).

On the other hand, the read head 60 is normally pressed inward by a pressure spring 76 so as to also contact the hollow platen 40. For example, the read head body 62 such as a contact image sensor and the read head It comprises a plate (L-shaped flange) 64 attached to the outside of the main body 62. The plate 64 also has, at both ends, portions 66 and 68 forming cam followers for performing a cam action with the cams 30 and 32 described later (see FIGS. 1 and 2).

At both ends of the camshaft 26 disposed so as to pass through the hollow platen roller 40 (one end is between the end of the hollow platen roller and the gear 20, and the other end is outside the end of the hollow platen roller. ) Cams 30 and 32 are mounted. The shapes of the cams 30 and 32 are as shown in FIG.
Arc portions 30a and 30a provided at two places on the outer periphery of the disk so as to protrude outside at an interval of, for example, about 120 °.
0b, 32a and 32b (see also FIGS. 4 and 5 to 9).

With such a configuration, the cam 3 is driven by the motor 14 via the gear 20 and the one-way clutch 24.
When 0 and 32 are rotated, the arc portions 30a, 32
a and / or 30b and 32b are the cam follower portions 56, 5 and 5 of the recording head 50 and / or the reading head 60.
8 and 66, 68 are pushed outwardly against the action of the pressure springs 76, 78, thereby moving the recording head 50 and / or read head 60 away from the hollow platen roller 40.

Next, referring to FIG. 4 for explaining the rotation of the hollow platen roller or the rotation of the cam based on the operation of the cam and the rotation direction of the motor, the rotation of the motor is indicated by an arrow A.
As shown by the arrow, in the forward direction, for example, in the clockwise direction, the power of the motor causes the hollow platen roller 40 (not shown in FIG. 4) to move forward through the one-way clutch 22 (not shown in FIG. 4). Although the cam is rotated in the direction, that is, clockwise, the cam is connected via the other one-way clutch 24, so that the cam is maintained in the same position without being rotated. Conversely, if the rotation of the motor is in the reverse direction, for example, counterclockwise as shown by arrow B, the power of the motor is transmitted to cam 30 via another one-way clutch 24, and The portion 30a or 30b is the recording head body 5
0 or the respective cam followers 56, 58 or 66, 68 of the read head body 60 are pushed up to move one or both of them away from the hollow platen roller.

Next, reference will be made to FIGS. 5, 6, 7, 8, and 9 for describing the selection of the cam position and the control mode. FIG. 5 shows a cam 80 and a group 80 of limit switches.
Is shown. The group 80 of limit switches is, for example, 3
Switch LS1, LS2, LS3, for example, three recesses 82 (b1, b2,
It operates with the four groups b3), and takes the modes shown in the following table depending on the ON / OFF state of these limit switches.

Table LS1 LS2 LS3 Standby mode (Position 1) OFF OFF ON Transmission mode (Position 2) OFF ON OFF Copy mode (Position 3) OFF ON ON Reception mode (Position 4) ON OFF OFF

FIGS. 6, 7, 8 and 9 show the positions of the cams when the above-described mode is taken.
In the standby mode, the recording head 50 and the reading head 60 are separated from the hollow platen roller, and this mode is used when the facsimile machine is not used, or during storage or transport. In the transmission mode, only the read head 60 is in contact with the hollow platen roller. In the copy mode, both the recording head 50 and the read head 60 are in contact with the hollow platen roller. Is in contact with the hollow platen roller.

Next, referring to FIG.
The mode setting and data processing by forward rotation will be described. The rotational driving force is simultaneously transmitted by the motor 14 to both the one-way clutches 22 and 24 via the reduction gear 16. Initially, the rotation of the motor is set to reverse, so that the camshaft is driven via one of the one-way clutches 24, and a group of limit switches allows one of the four positions of the aforementioned cam to be commanded according to the command. Once selected, the cam stops at that position. Thereby, one of the above-described control modes (for example, the transmission mode) is selected.

Next, the motor is set to the normal rotation, and the rotational driving force of the motor is driven through the other one-way clutch 22 to drive the hollow platen roller to perform data processing (for example, reading).

[0024]

As described in detail above, the present invention provides
A standby position for holding the read head and the recording head or the recording paper pressing means apart from the platen roller prevents plastic deformation of the rubber and eliminates the need for a paper piece or the like to be inserted between the rubber used during standby and the head. it can.

Further, since the recording head can be separated from the platen roller and made to stand by, the recording paper can be easily loaded, and a complicated structure including a conventionally-used push lever and a link mechanism is not required. Further, the recording paper can be easily loaded by simply selecting the standby position by the cam.

Furthermore, since the reading head can be separated from the platen roller and made to stand by, the original can be easily released without using a conventional hand-push lever and a link mechanism.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a facsimile apparatus of the present invention.

FIG. 2 is a schematic sectional view of a facsimile machine.

FIG. 3 is a detailed sectional view of a part of FIG. 1;

FIG. 4 is a schematic diagram for explaining rotation of a hollow platen roller or rotation of a cam based on a function of a cam and a rotation direction of a motor.

FIG. 5 is a schematic diagram for explaining selection of a cam position and a control mode.

FIG. 6 is a schematic diagram for explaining selection of a cam position and a control mode.

FIG. 7 is a schematic diagram for explaining selection of a cam position and a control mode.

FIG. 8 is a schematic diagram for explaining selection of a cam position and a control mode.

FIG. 9 is a schematic diagram for explaining selection of a cam position and a control mode.

FIG. 10 is a schematic diagram for explaining mode setting and data processing based on reverse rotation and forward rotation of the motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Facsimile apparatus 12 Frame 14 Motor 16 Reduction gear 18, 20 Gear 22, 24 One-way clutch 26 Cam shaft 30, 32 Cam 40 Hollow platen roller 50 Recording head 60 Read head 76, 78 Pressure spring 80 Limit switch

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04N 1/00

Claims (3)

(57) [Claims] 1. A hollow platen roller, a cam shaft that penetrates through the hollow platen roller at a distance from the hollow platen roller and is rotatably disposed, and at least one of the cam shaft outside the hollow platen roller. A cam mounted at the end, and a read head and a recording head disposed around the hollow platen roller in operative relation with the cam, wherein the operation of the cam selectively causes the read head and the recording head to be hollow. A facsimile machine having a standby position for holding the platen roller away from the platen roller, a transmission position for bringing only the read head into contact with the hollow platen roller, and a reception position for bringing only the recording head into contact with the platen roller. 2. The facsimile apparatus according to claim 1, further comprising a copy position at which the reading head contacts the hollow platen roller and the recording head contacts the hollow platen roller. 3. The facsimile apparatus according to claim 1, further comprising a plurality of operating means disposed on an outer surface of said cam, and a switch disposed so as to be selectively operatively associated with said operating means. Means and the switch, the read head or the recording head, the standby position, the transmission position,
A facsimile machine characterized by positioning at a receiving position.