Image data transmission apparatus

An image data transmission apparatus, which may be used as a facsimile apparatus, includes an image data reader which is detachably connected to the main body. The reader can read image data from an original fed past the reader, or it can be detached and used to scan an original. A device exists within the apparatus, which detects the mounting or unmounting of the reader, and if it is detected to be unmounted and not being used, power will be shut off. Further, a device exists, within the apparatus, which, when the reader is detected as mounted, will print read data. Also, when the reader is detected as unmounted, read data will be stored in memory. Thus, a speedy and power efficient image data transmission apparatus has been created.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
The present invention relates to an image data transmission apparatus, 
appropriately used as a facsimile apparatus, which posses a detachable 
image reading unit. 
2. Description of the Prior Art 
With regard to the facsimile apparatus, the image of the original, inserted 
by an operator into the original inlet formed in the apparatus main body, 
is read. The read image data is then transmitted to other facsimile 
apparatus connected through a telephone line. The original inlet is formed 
in the vicinity of the reading unit such as a one-dimensional contact type 
image sensor installed in the apparatus main body, and its size 
corresponds to the length of the contact type image sensor. 
In such a facsimile apparatus, it is impossible to read and transmit the 
image of large or bulky originals that cannot be inserted into the 
original inlet. 
To solve such a problem, a reading unit may be installed with contains a 
having reading unit detachably connected to the apparatus main body of the 
facsimile apparatus. Thus, the image of the original manually by detaching 
the reading unit from the apparatus main body. In such a constructed 
facsimile apparatus, the following four functions may be assumed. 
(1) The function, for detaching the reading unit from the apparatus main 
body, scanning the surface of original manually by the operator, and 
transmitting the thus read image data through the telephone line, is 
assumed. 
(2) The function, for reading the image data by operating the reading unit 
manually, prior to transmission of the image data through the telephone 
line, storing the read image data in a memory, and transmitting the image 
data through the telephone line after all the image data to be transmitted 
has been stored in the memory, is assumed. 
(3) The function, for inserting the original from the original inlet, with 
the reading unit mounted on the apparatus main body, to read the original 
image sequentially through the reading unit as the original is conveyed 
automatically, and transmitting the read image data directly, is assumed. 
(4) The function, for inserting the original from the original inlet to 
copy the original, without connecting the facsimile apparatus to the 
telephone line, with the reading unit mounted on the apparatus main body, 
is assumed. 
To realize these functions 1 to 4, for example, on the operation unit 
assembled in the apparatus main body of the facsimile apparatus, four 
function keys corresponding to these functions may be provided, but the 
controllability is lowered greatly when such function keys for each 
function are provided. 
Meanwhile, in such facsimile a apparatus, during the reading action, a 
conveying roller, installed in the apparatus main body, is driven by a 
pulse motor or similar type device. Accordingly, in the case of functions 
3 and 4 above, the original is automatically conveyed. In functions 1 and 
2, however, since the reading unit is dismounted from the apparatus main 
body to be scanned on the original manually, it is not necessary to convey 
the original, however, the conveying roller is still driven. Therefore, 
the electric power is wastefully consumed by the rotation of the conveying 
roller. 
Furthermore, in this facsimile apparatus, the reading processing is 
terminated in the following manner. 
That is, in functions 1 and 2, the key provided for terminating the reading 
processing is manipulated. In functions 3 and 4, the end of the original 
is detected by a sensor, and the reading processing is automatically 
terminated by this detected signal. In the facsimile apparatus designed to 
perform reading processing only by scanning the reading unit manually, the 
reading processing is started and finished by the same key operation. 
However, considering misoperations when functions 3 and 4 are being used, 
such constitution is not suited to the facsimile apparatus possessing 
functions 1 to 4. 
Therefore, as stated above, another key for terminating the reading 
processing of the image of the original must be additionally installed. 
Such addition of a key will complicate the structure, and induce errors 
due to misoperation. This, thereby worsens the controllability of the 
facsimile apparatus. 
SUMMARY OF THE INVENTION 
It is hence a primary object of the invention to present an image data 
transmission apparatus capable of saving power consumption without doing 
wasteful actions by solving the above-discussed technical problems. 
To achieve the above object, the invention presents an image data 
transmission apparatus for transmitting the image data of the original, 
which is read by a detachable reading unit, detachably installed in the 
transmission apparatus main body. The image reading unit comprises: 
a rotary roller rotating in contact with an original surface from which the 
image is to be read. It 
Further includes a device for detecting the relative moving state between 
the image reading unit and the original, and leads out signals at every 
predetermined angular dislocation amount of the rotary roller. It further 
includes 
an optical reading. It further includes 
The transmission apparatus main body comprises: 
an original conveying roller which is driven to rotate, and 
a device for transmitting and receiving image data. Also included is a 
device for detecting the presence or absence of the mounting state of the 
image reading unit, as well as 
a device for stopping the original conveying roller when the unmounted 
state of the image reading unit is detected by the mounting state 
detecting device. 
In the image data transmission apparatus according to the invention, the 
image reading unit is detachably mounted on the transmission apparatus 
main body. While this image reading unit is dismounted from the 
transmission apparatus main body, there is no original to be conveyed, and 
it is not necessary to drive the original conveying roller. In such a 
case, the mounting state detecting detects detects the unmounted state of 
the image reading unit, and the control device stops the original 
conveying roller. Therefore, waste of electric power, due to purposeless 
driving of the original conveying roller, may be eliminated. 
It is another object of the invention to present an image data transmission 
apparatus, of which image reading unit is detachably installed in the 
transmission apparatus main body, which is outstandingly enhanced in its 
controllability such that the mode of actions can be selected 
automatically. 
To achieve the above object, this invention presents an image data 
transmission apparatus comprising a transmission apparatus main body and 
an image reading unit detachably mounted on this transmission apparatus 
main body, so as to transmit the image data by using a telephone line. 
The transmission apparatus main body comprises: 
A device for detecting the presence or absence of a mounting state of the 
image reading unit, 
and a device for detecting an open state of telephone line. 
A printer is also included for printing out image data as 
memory for storing the image data. 
Finally, a device for controlling the processing of the image data 
transmission apparatus is also included which reports to the output of the 
mounting state detecting device, the open state detecting device and the 
memory. While reading the image data, (a) in the case of detecting an the 
open state, the read image data may be transmitted. (b) In the case of a 
open state not being detected (b1) when the mounting state of the image 
reading unit is detected, the image data may be printed out by the 
printer. (b2) However, the mounting state of the image reading unit is not 
detected, the image data may be stored in the memory for transmitting. 
According to the invention, when reading and transmitting the image, if the 
open state is detected, the read data is transmitted through the telephone 
line. If the open state is not detected, but when the mounting of the 
image reading unit is detected, the image data is printed out by the 
printing device. Furthermore, when neither the open state nor the mounting 
of image reading unit is detected, the image data is stored in the memory 
device. 
Thus, the functions 1 to 4 mentioned in the Description of Prior Art may be 
automatically selected and set. 
Therefore, in the image data transmission apparatus of the invention, the 
operator does not have to operate the buttons selectively when using the 
functions of the image data transmission apparatus selectively. As a 
result, errors due to misoperation of the image data transmission 
apparatus may be prevented, and its controllability is outstandingly 
enhanced. 
In a preferred embodiment of the invention, the image reading unit 
comprises: 
a rotary roller rotating in contact with the surface of the original from 
which the image is to be read and 
a device for detecting the relative moving state of the image reading unit 
and the original, leading out signals at every predetermined angular 
dislocation amount of the rotary roller. 
It further includes contact type image sensor. The unit operates such that 
a controlling device stores the image data of every scan from the 
one-dimensional contact type image sensor in synchronism with the output 
of the relative moving state detecting device. 
The invention further presents an image data transmission apparatus for 
transmitting the image data of the original which is read by the image 
reading unit, detachably mounted on the transmission apparatus main body, 
onto a transmission line. 
The image reading unit comprises: 
a rotary roller rotating in contact with the surface of the original from 
which the image is to be read and 
A device for detecting the relative moving state between the image reading 
unit and the original. It then leads out signals at every predetermined 
angular dislocation amount of the rotary roller. 
The device further includes an optical reading device 
The transmission apparatus main body comprises: 
A device for terminating the reading action of the image and cancelling the 
connection of the transmission line for transmission of an image data when 
reading the original with the image reading unit dismounted from the 
transmission apparatus main body, and when the signal from the relative 
moving state detecting device stops for a predetermined period. 
According to the invention, when transmitting the image data upon reading 
the image by scanning the image reading unit manually over the surface of 
the original with the image reading unit dismounted from the transmission 
apparatus main body, its termination is effected as follows. That is, when 
a signal is not led out for a predetermined period from the angular 
dislocation detecting device, for leading out signals at every 
predetermined angular dislocation amount of the rotary roller, the control 
device terminates the reading action of the image and cancels the 
connection of the communication line for transmission of the image data. 
Therefore, the operator has only to stop scanning the image reading unit 
for a specified period to terminate transmission of the image data. Thus, 
the controllability of the image data transmission apparatus may be 
enhanced.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Referring now to the drawings, preferred embodiments of the invention are 
described in details below. 
EXAMPLE 
FIG. 1 is a perspective view showing the outline of a telephone set 1, 
which is an image data transmission apparatus conforming to an embodiment 
of the invention. The telephone set 1 is designed so as to also possess a 
function for facsimile, and comprises an apparatus main body 2 and a 
handset 3, among others. The apparatus main body 2 is equipped with a 
detachable reading unit 4, and a start switch 5 for instructing the start 
of reading of the original when disposed in the upper part thereof. When 
the reading unit 4 is mounted on the apparatus main body 2, an inlet 6, 
for inserting the original, is formed in relation to the reading unit 4. 
The apparatus main body 2 further comprises, in the vicinity of the inlet 
6, an operation panel 7 in a manner to freely dislocate angularly around 
the axial line crossing the inserting direction of the original at one 
end. That is the axial line, approximately parallel to the longitudinal 
direction of the inlet 6, is when angular dislocation of the operation 
panel 7 occurs. This operation panel 7 contains a numeric key group 8 for 
selecting a number to be dialed, and a function key group 9 for specifying 
various functions. 
FIG. 2 is a perspective view showing the dismounted state of the reading 
unit 4 from the apparatus main body 2. The reading unit 4 contains a 
one-dimensional contact type image sensor (hereinafter called image 
sensor) 10 and a detection roller 11 which is described below. 
In the mounting part 12, for mounting the reading unit 4 of the apparatus 
main body 2, a conveying roller 13 for conveying the original is disposed. 
At the operation panel 7 side of this conveying roller, that is, at the 
upstream side of the original conveying direction (the direction of arrow 
Al in FIG. 2), an original sensor 14, for detecting the insertion of an 
original, is provided. Moreover, a detecting sensor 15 is used as the 
mounting state detecting device for detecting mounting or dismounting, of 
the reading unit 4, on or off the apparatus main body 2. It is disposed in 
the vicinity of the end of the mounting part 12. 
At the bottom of the mounting part 12 a friction reducing sheet 16 which is 
a sheet member made of material, which has a low coefficient of friction, 
and is disposed at the position opposite to the detection roller 11, with 
the reading unit 4 mounted on the mounting part 12. On the surface of this 
friction reducing sheet 16, for example as shown in FIG. 3, an 
illustration is printed to explain the handling manner of the reading unit 
4. 
In this telephone set 1, when recording the image data in the case of 
reception of image data and so on, a thermal recording paper 22, on which 
the image was recorded, is conveyed from the lower part of the operation 
panel 7 in the direction of arrow A2 in FIG. 2, and is discharged out of 
the apparatus main body 2. 
FIG. 4 is a perspective view showing the use of the reading unit 4 when it 
is dismounted from the apparatus main body 2. When reading an original 
which is too big or too bulky, such as a book, to be inserted into the 
original inlet 6, the reading unit 4 is detached from the apparatus main 
body 2. In this case, the operator puts the reading unit 4 on the original 
17 so that the image sensor 10 of the reading unit 4 faces the surface of 
the original 17, and presses the start switch 5. He then moves the reading 
unit 4 in the direction of arrow 18 in FIG. 4. In this way, the image 
sensor 10 scans the original 17, and the original image is read. At this 
time, since the detection roller 11 rotates in proportion to the 
dislocation of the reading unit 4, the reading position may be detected 
by, for example, a rotary encoder disposed in relation to the detection 
roller 11. 
FIG. 5 is a longitudinal sectional view showing a simplified structure of 
the telephone set 1. A rotary encoder 19 is disposed in relation to the 
detection roller 11, and its output is applied to an electric circuit part 
20 assembled in the apparatus main body 2. Therefore, when the reading 
unit 4 is dismounted from the apparatus main body 2, the information about 
the reading position of the image sensor 10 is fed into the electric 
circuit part 20. 
In the apparatus main body 2, near the end, at the opposite side of the 
inlet 6 of the operation panel 7, there is disposed a platen 24 for 
conveying the thermal recording paper 22 supplied from the recording paper 
roll 21 in the arrow 23 direction. When recording the image, this platen 
24 is angularly dislocated in the direction of arrow 25 by a pulse motor 
(not shown) or the like. In relation to the platen 24, a thermal head 26 
is disposed. The thermal head 26 is composed of plural heating resistance 
elements arranged in dot forms along the longitudinal direction of the 
platen 24. 
When recording the image information onto the thermal recording paper 22, 
the platen 24 is angularly dislocated in the direction of arrow 25, and 
the thermal head 26 is heated and driven in correspondence to the image to 
be recorded. 
In the telephone set 1, when the function key group 9 is operated and the 
facsimile function is selected, the operation panel 7 is angularly 
dislocated in the direction of arrow 27 by the operator., and is supported 
by a structure (not shown) at the position indicated by broken line in 
FIG. 5. In such state, a plurality of originals can be put on the 
operation panel 7, and the operation panel 7 plays the role as the 
original stacker for stacking the originals. The plurality of originals 
put on the operation panel 7 are led one by one from the inlet 6 to the 
vicinity of the image sensor 10, and are conveyed by the conveying roller 
13, which is driven by a pulse motor or the like, at a constant speed in 
the direction of arrow 28, while the original image is being read. 
FIG. 6 is a block diagram showing a basic structure of the part relating to 
the image data transmission of the telephone set 1. In the telephone set 
1, the following four operation modes are automatically set in relation to 
the reading action of the reading unit 4. 
(1) Direct transmission mode 
With the reading unit 4 dismounted from the apparatus main body 2, the 
original is manually scanned as shown in FIG. 4, and thus read image data 
is transmitted through telephone line directly. 
(2) Memory transmission mode 
With the reading unit 4 dismounted from the apparatus main body 2, the 
original is manually scanned as shown in FIG. 4, and the read image data 
is once stored in the memory. After storing all image data on the original 
surface, the image data is read out from the memory to be transmitted. 
(3) Ordinary transmission mode 
With the reading unit 4 mounted on the apparatus main body 2, the original 
is inserted into the inlet 6, and is conveyed by the conveying roller 13. 
Thus occurs while the original image is read by the image sensor 10, and 
thus read image data is transmitted directly. 
(4) Copy mode 
With the reading unit 4 mounted on the apparatus main body 2, without 
connecting the telephone set 1 to the telephone line, the original is 
inserted from the inlet 6. It is then conveyed by the conveying roller 13, 
while the original image is read by the image sensor 10. Thus, from 
recorded image data, a copy image of the original is obtained on the 
thermal recording paper 22 by the function of the thermal head 26 and 
others. 
These modes are selected by the processing in the main control part 30 of 
the telephone set 1 as described below. To the main control part 30, 
signals are fed from the motor control part 32 and encoder 19 for 
controlling the operation of the pulse motor 31 for driving the conveying 
roller 13, and an encoder monitor part 33 for converting the signals into 
reading position mode," and when the open state is not detected, the 
operation information, and a communication control part 34 for controlling 
the line connection between the telephone set 1 and telephone line are 
connected thereto. Also to the main control part 30, signals corresponding 
to the operation of the numeric key group 8 and function key group 9 are 
given. The signals are also fed from the sensor circuit part 35. To which 
the original sensor 14 and detecting sensor 15 are connected. 
The image data from the image sensor 10 is taken into the reading 
processing part 36, with every image data corresponding to one scanning 
line (hereinafter called line). To the main control part 30, the image 
data is sent from this reading processing part 36. To the reading 
processing part 36, an image data memory 37 is connected as the memory 
device for storing the image data for a plurality of lines. When copying 
to the thermal recording paper 22, the image data sent from the reading 
processing part 36 to the main control part 30 is applied, through a 
buffer 38, to a printing part 39. The printing part 39 comprises circuits 
for driving the thermal head 26 and for driving and controlling the platen 
24. 
When transmitting image data through the telephone line, the image data is 
sent from the main control part 30 to the communication control part 34 
which is the open state detecting device. It is then compressed, and is 
modulated in a modem 40, which is used for modulating and demodulating the 
conveying signal transmitted and received through the telephone line, and 
is sent out into the telephone line from a network control unit (NCU) 41. 
While the reading unit 4 is mounted on the apparatus main body 2, the 
reading processing part 36 takes in the image data in synchronization with 
the rotation of the pulse motor 31. The line timing signal for defining 
such image data take-in timing is sent from the motor control part 32 to 
the reading processing part 36, through a line 42. While the reading unit 
4 is dismounted from the apparatus main body 2, the pulse motor 31 is not 
rotated, and the reading processing part 36 must take in the image data 
according to the reading position information from the encoder 19. The 
line timing signal for reading the image data in such case a is sent from 
the encoder monitor part 33 to the reading processing part 36, through a 
line 43. 
Termination of reading of image data in such case, when the reading unit 4 
is mounted on the apparatus main body 2, is affected by the signal from 
the original sensor 14 as described below. If the reading unit 4 is not 
mounted on the apparatus main body 2, when the line timing signal from the 
encoder monitor part 33 is not led out for a specified period, reading 
action is terminated by the judgement of the main control part 30. 
FIG. 7 is a flowchart for explaining the operation relating to the image 
data transmission processing of the telephone set 1. At step n1 in FIG. 7 
(1), when the start switch 5 is pressed to instruct the reading of the 
original, it is judged whether or not the reading unit 4 is mounted on the 
mounting part 12 of the apparatus main body 2 according to the signal from 
the detecting sensor 15, at step n2. When it is judged that the reading 
unit 4 is mounted on the apparatus main body 2, the operation advances to 
step n21 in FIG. 7 (3), and if not mounted, it goes to step n3. 
At step n3, in the main control part 30, on the basis of the line state 
information given from the communication control part 34, it is judged 
whether the facsimile apparatus at the destination is connected to the 
telephone line or not . That is, it is judged whether or not open state of 
the telephone line is detected. When the open state is not detected, the 
operation advances to step n13 in FIG. 7 (2), and the setting process 
corresponding to the "memory transmission mode" affected. When the open 
state is detected, the setting process corresponding to the "direct 
transmission mode" is affected at step n4. 
Moving from step n4 to step n5, it is judged whether or not the line timing 
signal is led from the encoder monitor part 33 to the line 43. When the 
line timing signal is not led out, the operation advances to step n10. 
Further, when the line timing signal is sent to the reading processing 
part 36, the image data of one line is sent to the image processing part 
36 in synchronism with the line timing signal. 
In succession, at step n7, the image data of one line is sent from the 
reading processing part 36 to the communication control part 34 through 
the main control part 30. This image data is then compressed in the 
communication control part 34. At the next step n8, the compressed image 
data is modulated in the modem 40. At step n9 the image data is 
transmitted from the NCU 41 through the telephone line. Afterward, the 
processing returns to step n5. 
At step n5, when the line timing signal is not led out into the line 43, 
the operation advances to step n10. Then the clock time of the clock 
device, (not shown) incorporated in the main control part 30, is referred 
to. This clock device is initialized and started up when the line timing 
signal is sent to the reading processing part 36. 
At step n11, it is judged whether or not the clock time in the clock device 
is longer than a predetermined time T1. This time T1 is the duration 
preliminarily determined in the main control part 30, so as to detect the 
end of reading of an original by manual scanning by the operator when the 
reading unit 4 is dismounted from the apparatus main body 2 and used. 
If the clock time is judged to be less than the time T1 by the clock device 
at step n11, the operation returns to step n5. When it judged to be not 
less than the time T1, the operation advances to step n12. At step n12, 
the main control part 30 sends out the end-of-message (EOM) signal to the 
facsimile at the destination through the communication control part 34, 
modem 40 and NCU 41, thereby terminating the transmission of image data. 
At step n3, when the open state is not detected, the operation advances to 
step n13 in FIG. 7 (2), and the setting process corresponding to the 
"memory transmission mode" is affected. 
At step n14, it is judged whether or not the line timing signal is sent to 
the reading processing part 36 from the encoder monitor part 33. If it is 
not sent, the operation advances to step n19. When the line timing signal 
is sent, the operation goes to step n15. 
At step n15, the reading processing part 36 receives in the image data for 
one line, from the image sensor 10, in synchronization with the line 
timing signal sent from the line 43. 
This image data, at step n16, is sent from the main control part 30 to the 
buffer 38, and is printed out on the thermal recording paper by the 
function of the printing part 39. It is also compressed at step n17, and 
is stored in the image data memory 37 at step n18. Afterwards, the 
processing returns to step n14. 
At step n14, when it is judged that the line timing signal is not led out 
from the encoder monitor part 33, the clock time of the clock device is 
referred to at step n19. There, it is judged whether or not the clock time 
is more than the time T1 at step n20. If the clock time is shorter than 
the time T1, the operation returns to step n14. When it is longer than the 
time T1, the memory processing of the image data to the image data memory 
37 is terminated. 
Afterwards, in the main control part 30, when the open state of the 
telephone line is detected, the reading processing part 36 reads the 
already stored image data from the image data memory 37, and sends it to 
the main control part 30. Thus, the image data sent given to the main 
control part 30 is transmitted to the facsimile apparatus at the 
destination by the function of the main control part 30, modem 40, NCU 41 
and others. 
At step n2, when it is judged that the reading unit 4 is mounted on the 
apparatus main body 2, the operation advances to step n21 in FIG. 7 (3). 
There it is judged whether or not the open state of the telephone line is 
detected. When the open state is detected, the operation skips to step n22 
to be set in the "ordinary transmission mode. When the open state is not 
detected, the operation advances to step n30 to be set in the "copy mode." 
When set in the "ordinary transmission mode" at step n22, a pulse motor is 
driven for the portion of one line at step n23. 
At step n24, in synchronism with the driving of the pulse motor 31, the 
image data of one line is read into the reading processing part 36 from 
the image sensor 10. The read image data is applied to be compressed in 
the communication control part 34 through the main control part 30 at 
steps n25, n26, and the compressed image data is modulated in the modem 
40. In succession, at step n27, the image data is transmitted from the NCU 
41. 
At step n28, according to the signal from the original sensor 14, it is 
judged whether or not the end of the original is detected or not, and when 
it is not detected, the operation returns to step n23. When it is 
detected, it advances to step n29. At step n29, the main control part 30 
sends out a post message signal to indicate the termination of 
transmission of the image data in one page of the original through the 
communication control part 34, modem 40 and NCU 41. This thereby finishes 
the transmission of image data for one page. 
At step n30, when the "copy mode" is set, the pulse motor 31 is driven for 
a portion of one line at step n31. In synchronism with this pulse motor 
driving, at step n32, the reading processing part 36 receives in the image 
data from the image sensor 10. At step n33, the image data received by the 
reading processing part 36 is sent from the main control part 30 to the 
buffer 38. Then, the print output on the thermal recording paper, based on 
the read image data, is carried out in the printing part 39. 
At step n34, it is judged whether or not the end of the original is 
detected on the basis of the signal from the original sensor 14. When it 
is not detected, the operation returns to step n31. When it is detected, 
the copy action is over. 
Thus, in this embodiment, the action modes of the telephone set 1 that can 
be set in correspondence with the reading action of the reading unit 4. 
That is, the direct transmission mode, memory transmission mode, ordinary 
transmission mode, and copy mode, can be automatically set in the main 
control part 30, on the basis of the signal from the detecting sensor 15 
and the information received from the communication control part 34 about 
the open state of the telephone line. 
When the open state is detected, while the reading unit 4 is not mounted on 
the apparatus main body 2, the "direct transmission mode" is selected. 
Further, when the open state is not detected, the "memory transmission 
mode" is selected. While the reading unit 4 is mounted on the apparatus 
main body 2, when the open state is detected, the "ordinary transmission 
mode" is set. Further, when the open state is not detected, the "copy 
mode" is set. 
Thus, since the operation modes about the transmission of the image data of 
the telephone set 1 are set automatically, it is not necessary to install 
function keys or others for setting the operation modes on the operation 
panel 7. Thus the number of function keys may be decreased. Therefore, 
when setting the operation modes, it is not necessary to operate the 
function keys. Thus the controllability of the telephone set 1 is enhanced 
superbly. 
Also, when the unmounted state of the reading unit 4 on the apparatus main 
body 2 is detected by the detecting sensor 15, if the reading of the 
original is started by the start switch 5, the pulse motor 31 is not 
rotated, and the conveying roller 13 is not driven. Therefore, wasteful 
power consumption by unnecessary rotation of the conveying roller 13 may 
be eliminated. 
Furthermore, when using the reading unit 4 by dismounting it from the 
apparatus main body 2, the reading action of the image data is 
automatically terminated when the reading unit 4 is stopped still for a 
while. Therefore, it is not necessary to install a function key for 
finishing the original reading action on the operation panel 7. Thus the 
number of function keys may be further decreased. Also, when finishing the 
original reading action, misoperation is eliminated because it not 
necessary to manipulate any function key. Thus the controllability of the 
telephone set 1 will be furthermore enhanced. 
The invention may be embodied in other specific forms without departing 
from the spirit or essential characteristics thereof. The present 
embodiments are therefore to be considered in all respects as illustrative 
and not restrictive, the scope of the invention being indicated by the 
appended claims rather than by the foregoing description and all changes 
which come within the meaning and the range of equivalency of the claims 
are therefore intended to be embraced therein.