JPH0890806A - Transfer type printer - Google Patents

Abstract

PURPOSE: To always stably effectively detect a ribbon end without using a sensor by arranging means for detecting the rotating speed of a ribbon feed roller, means for detecting the rotating speed of a ribbon take-up roller, etc. CONSTITUTION: A ribbon feed roller 27 wound with an ink transfer ribbon 28 is provided, and the ribbon 28 is fed from the roller 27 between a thermal print head 21 and a platen 22 via a pulley 29. Ink is thermally transferred to be printed to the label of a sheet 25 for the label by the head 21, and the used ribbon 28 is taken up by a ribbon take-up roller 30. Slit discs 33, 34 are fixed to the rotary shafts of the rollers 27 and 30, and the slits of the discs 33, 34 are detected by a transmission type supply sensor 35 and a take-up side 36. The label sheet 25 after printing is finished is externally discharged from an exhaust outlet 32 opened at a housing frame 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer type printer which prints by transferring ink with an ink transfer ribbon.

[0002]

2. Description of the Related Art For example, as shown in FIG. 7, a label printer which prints on a label or a tag using an ink transfer ribbon has a thermal print head 1 and a platen 2 which are opposed to each other, and a platen 2 is a platen motor 3. The label paper 5 which is rotated by the label feed roller 4 and has the label attached to the mount at a predetermined interval is fed between the thermal print head 1 and the platen 2 via the feed roller 6.

Further, a ribbon feed roller 8 around which the ink transfer ribbon 7 is wound is provided, and the ink transfer ribbon 7 is fed from the ribbon feed roller 8 via the pulley 9 between the thermal print head 1 and the platen 2. The thermal print head 1 thermally prints ink on the label of the label paper 5 to perform printing, and the used ink transfer ribbon 7 is wound by the ribbon winding roller 10.

A transmission infrared sensor 11 is arranged between the ribbon feed roller 8 and the pulley 9 to detect the ribbon end, and a transmission sensor 12 is arranged between the label feed roller 4 and the feed roller 6. The paper jam of the label paper 5 is detected, and the reflection type sensor 13 is arranged between the thermal print head 1 and the ribbon winding roller 10 to detect the ribbon breakage.

Ribbon end detection by the transmissive infrared sensor 11 is performed by attaching a silver curtain to the last portion of the ink transfer ribbon 7. That is, since infrared rays normally pass through the ink transfer ribbon 7, the infrared sensor 1
Although 1 is in the ribbon detection state, the infrared sensor 11 detects the ribbon end because infrared rays do not pass when the silver curtain comes.

Further, in detecting the paper jam of the label paper 5 by the transmissive sensor 12, a light transmissive one is used as the mount of the label paper 5, and the transmissive sensor 12 is a part only the mount and a part where the label is attached. This is done by distinguishing and detecting. That is, the time required to pass the set label length + the length of the margin is set in advance as the label passing time, and if the time during which the transparent sensor 12 is detecting the label is within the set label length + the length of the margin, the label is passed. Paper 5
Is determined to be normally conveyed, and if the time exceeds the set label length + the length of the margin, it is determined that the label sheet 5 is not conveyed and a paper jam is detected.

Further, when the ink transfer ribbon 7 is normal, the light from the reflection type sensor 13 is reflected on the ribbon so that the ribbon can be detected. However, when the ribbon is cut, the reflection sensor 13 loses the reflection of light and therefore the reflection type sensor 13 is broken. To detect.

When the infrared sensor 11 detects the ribbon end, the transmissive sensor 12 detects the jam of the label paper, and the reflective sensor 13 detects the ribbon break, an error is displayed.

[0009]

However, when the ribbon end detection, the paper jam detection and the ribbon breakage detection are performed by using the respective sensors as described above, static electricity may be generated on the ink transfer ribbon or the label paper. Then, static electricity is discharged to the sensor and adversely affects the sensor, and in some cases, the sensor malfunctions.

Further, dust (ribbon dust, paper dust, etc.) from the ink transfer ribbon or label paper may be accumulated in the sensor, and the operation of the sensor may be disabled.

The invention according to claim 1 provides a transfer type printer which can always reliably and reliably detect the ribbon end without using a sensor.

The invention according to claim 2 provides a transfer type printer which can always stably and reliably detect jamming of a printing medium without using a sensor.

The invention according to claim 3 provides a transfer type printer which can always reliably detect a ribbon end, a jam of a print medium and a ribbon break without using a sensor.

[0014]

The invention according to claim 1 is
In a transfer type printer that passes an ink transfer ribbon and a print medium between the print head and the platen and performs ink transfer on the print medium by the print head to perform printing,
A ribbon feed roller that feeds the ink transfer ribbon between the print head and the platen, a ribbon take-up roller that winds up the used ink transfer ribbon, and a feed-side rotation speed detection unit that detects the rotation speed of the ribbon feed roller. A winding-side rotation speed detecting means for detecting the rotation speed of the ribbon winding roller, and a first detecting means for detecting whether or not the feed-side rotation speed detected by the feed-side rotation speed detecting means is within a preset allowable range. Speed detecting means, second speed detecting means for detecting whether or not the winding-side rotation speed detected by the winding-side rotation speed detecting means is within a preset allowable range, and the first speed detecting means. Ribbon end determination means for determining the ribbon end when the feed-side rotation speed detected by is less than the allowable range and the winding-side rotation speed detected by the second speed detection means is less than the allowable range. In which the provided.

A second aspect of the present invention is a transfer type printer that prints by passing an ink transfer ribbon and a print medium between a print head and a platen to transfer the ink onto the print medium by the print head. , A ribbon feed roller that feeds the ink transfer ribbon between the print head and the platen, a ribbon take-up roller that winds up the used ink transfer ribbon, and a feed-side rotation speed detection unit that detects the rotation speed of the ribbon feed roller. A winding-side rotation speed detecting means for detecting the rotation speed of the ribbon winding roller, and a first detecting means for detecting whether or not the feeding-side rotation speed detected by the feeding-side rotation speed detecting means is within a preset allowable range. No. 1 speed detecting means, and detecting whether or not the winding-side rotation speed detected by the winding-side rotation speed detecting means is within a preset allowable range. When the rotation speed on the feed side detected by the first speed detection means and the rotation speed on the winding side detected by the second speed detection means are less than the allowable range, the print medium is clogged. A jam determining means for determining is provided.

According to a third aspect of the present invention, there is provided a transfer type printer for performing printing by passing an ink transfer ribbon and a print medium between a print head and a platen to transfer the ink onto the print medium by the print head. , A ribbon feed roller that feeds the ink transfer ribbon between the print head and the platen, a ribbon take-up roller that winds up the used ink transfer ribbon, and a feed-side rotation speed detection unit that detects the rotation speed of the ribbon feed roller. A winding-side rotation speed detecting means for detecting the rotation speed of the ribbon winding roller, and a first detecting means for detecting whether or not the feeding-side rotation speed detected by the feeding-side rotation speed detecting means is within a preset allowable range. No. 1 speed detecting means, and detecting whether or not the winding-side rotation speed detected by the winding-side rotation speed detecting means is within a preset allowable range. And a ribbon for determining the ribbon end when the feed-side rotation speed detected by the first speed detection means is less than the allowable range and the winding-side rotation speed detected by the second speed detection means is less than the allowable range. When the feed-side rotation speed detected by the end determination means and the first speed detection means is within the allowable range and the winding-side rotation speed detected by the second speed detection means is less than the allowable range, it is judged that the print medium is jammed. The jam determining means and the ribbon break determining means for determining the ribbon break when the winding-side rotation speed detected by the second speed detecting means exceeds the allowable range.

[0017]

In the invention according to claim 1, when the ribbon feed roller stops rotating due to the ribbon end state, the first
The speed detection means detects that the rotation speed on the feed side has fallen below the allowable range. Further, the ribbon take-up roller is also pulled by the ink transfer ribbon and does not rotate, so that the second speed detecting means detects that the take-up side rotational speed is below the allowable range. This determines the ribbon end.

In the invention according to claim 2, if the print medium is jammed during conveyance, the ribbon is not delivered to the ribbon take-up roller side, so that the ribbon take-up roller hardly rotates and the second speed is reached. The detection means detects that the rotation speed on the winding side has fallen below the allowable range.
Further, the ribbon feeding roller normally feeds the ink transfer ribbon, and the first speed detecting means detects that the feeding side rotational speed is within the allowable range. As a result, the clogging of the print medium is determined.

According to the third aspect of the invention, the first speed detecting means detects the feed side rotational speed below the allowable range and the second speed detecting means detects the winding side rotational speed below the allowable range. Ribbon end is judged. Further, the clogging of the print medium is determined by the detection by the second speed detecting means that is less than the permissible range of the winding-side rotational speed and the detection by the first speed detecting means within the permissible range of the feeding-side rotational speed. Further, the ribbon breakage is judged by the detection by the second speed detecting means which exceeds the allowable range of the winding side rotation speed.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a label printer.

As shown in FIG. 1, the thermal print head 2
1 and the platen 22 are opposed to each other, the platen 22 is rotated by the platen motor 23, and the label paper 25 on which the label is attached to the mount from the label feed roller 24 at a predetermined interval is fed to the thermal print head 21 via the feed roller 26. It is designed to be delivered to and from the platen 22.

Further, a ribbon feed roller 27 around which an ink transfer ribbon 28 is wound is provided, and the ribbon feed roller 27 is provided.
From the ink transfer ribbon 28 through the pulley 29 between the thermal print head 21 and the platen 22,
With the thermal print head 21, the label paper 25
The label is subjected to thermal transfer of ink for printing, and the used ink transfer ribbon 28 is wound up by the ribbon winding roller 30.

Slit disks 33 and 34 are fixed to the rotary shaft of the ribbon feed roller 27 and the rotary shaft of the ribbon take-up roller 30, respectively.
The slit 4 is detected by the transmission type supply sensor 35 and the winding sensor 36, respectively. In this embodiment, since the supply side sensor 35 and the take-up side sensor 36 are provided on the back side of the housing frame 31 in FIG. 1, ribbon dust and paper dust generated from the label paper 25 and the ink transfer ribbon 28 are removed. Not easily affected.

After the printing is completed, the label sheet 25 is discharged to the outside through a discharge port 32 opened in the casing frame 31.

FIG. 2A shows the structure of the ribbon feed roller 27. The ribbon feed roller 27 is provided with a roller shaft 41 for setting an ink ribbon roll around which an unused ink transfer ribbon 28 is wound. A guide plate 42 provided at one end of the roller shaft 41 for adjusting the side end of the ink transfer ribbon 28, and a rotation provided at one end of the roller shaft 41 and penetrating the casing frame 31 to the outside. Axis 4
3 and the slit disk 3 fixed to the rotating shaft 43
3 and 3.

As shown in FIG. 2 (b), the slit disk 33 has slits 33a formed at the outer edge portion thereof at regular intervals, and the slit 33a is rotated by the rotation of the slit disk 33a.
The passage on the supply side is detected by the supply side sensor 35.

The structure of the ribbon take-up roller 30 is exactly the same as that of the ribbon feed roller 27.

FIG. 3 is a block diagram showing the circuit configuration, in which a CPU (central processing unit) 51 constituting the control unit main body is provided.
A ROM (Read Only Memory) 53, a RAM (Random Access Memory) 54, a drawing RAM 55, and a print controller 5 are provided to the CPU 51 via a bus line 52.
6, the interface 57 and the display unit 58 are connected.

Program data for the CPU 51 to control each part is stored in the ROM 53.
The AM 54 has various memories for processing data,
As shown in FIG. 4, a memory SMSV that saves the slit value on the ribbon winding side, a memory SOSV that saves the slit value on the ribbon feeding side, a winding counter MCNT that counts the number of slits on the ribbon winding side, and a ribbon feeding side. Feed counter SCNT that counts the number of slits, winding side stop flag MSTPF, feed side stop flag OST
PF, ribbon end flag REF, ribbon cut flag R
A CF and a label jam flag LJF are provided.

In the drawing RAM 55, a dot printing pattern to be printed on a label is developed and stored. The interface 57 is connected to an external host computer 50 and receives print commands and print data from the host computer 50.
The display unit 58 is adapted to display the number of labels to be issued, print contents, and other error displays.

The print control unit 56 includes the platen motor 23, the thermal print head 21, and the supply side sensor 35.
A ribbon feed motor 59 for driving the ribbon feed roller 27 while the winding side sensor 36 is connected.
Also, a ribbon winding motor 60 for rotating the ribbon winding roller 30 is connected.

FIG. 5A shows the slit disk 3 when the ribbon feeding roller 27 and the ribbon winding roller 30 are rotated.
The output waveforms when the sensors 35, 36 detect the slits 3, 34, that is, the slit values, are at a high level while the slits are being detected, and are at a low level between the slits and the next slit.

The rotation speeds of the ribbon feeding roller 27 and the ribbon winding roller 30 differ depending on the ribbon diameter. That is, when the ribbon diameter is the maximum, the rotation speed is slow, so the time from detecting the slit to detecting the next slit is long, and conversely, when the ribbon diameter is the minimum, the rotation speed is fast and the slit is detected. The time from the detection of the next slit to the next slit becomes short. For example, this time is 50msec
There is a change of 100 msec.

Then, as shown in FIG. 5B, the outputs of the sensors 35 and 36 are sampled at intervals of 5 msec, the number of high-level samplings of the output of the supply side sensor 35 is counted by the counter SCNT, and the winding is performed. Taken side sensor 3
The number of high level samplings of the output of 6 is counted by the counter MCNT.

Then, the counters SCNT, MCNT
Use the count value of to determine whether the ribbon end, paper jam of label paper, or ribbon breakage.

That is, the CPU 51 is adapted to perform the error monitoring process shown in FIG.

First, in step S1, the ribbon winding side slit value is read from the winding side sensor 36. This is 5
The sampling is performed every msec. If it is the first time, the slit value at that time is stored in the memory SM in step S2.
Save to SV and set "1" to the winding counter MCNT in step S3.

If the sampling is not the first time,
Succeedingly, in a step S4, it is checked whether or not the slit value changes for the second time, and if it is not the second time, the winding counter MCNT is incremented by 1 in a step S5. If it is the second time, it is checked in step S6 whether the count value of the winding counter MCNT is "less than 10", and the count value is "10".
If "less than", in step S7 the ribbon cut flag RC
Set F and exit this process.

If the count value of the winding counter MCNT is not "less than 10", the slit value is saved in the memory SMSV in step S2, and "1" is set in the winding counter MCNT in step S3.

When the processing of step S3 or step S5 is performed, subsequently, in step S8, the winding counter MC
It is checked whether the count value of NT exceeds "40".

If the count value of the winding counter MCNT does not exceed "40", then step S9 follows.
At, it is checked whether or not the sending side stop flag OSTPF is "0", and if it is "0", this processing is exited.

If the feed side stop flag OSTPF is "0", then the ribbon feed side slit value is read from the feed side sensor 35 in step S10. This is 5
The sampling is performed every msec. If it is the first time, the slit value at that time is stored in the memory SO in step S11.
The data is saved in SV, and the feed counter SCNT is set to "1" in step S12.

If the sampling is not the first time,
Succeedingly, in a step S13, it is checked whether or not the slit value is changed for the second time, and if it is not the second time, the feed counter SCNT is incremented by 1 in a step S14. If it is the second time, the slit value is saved in the memory SOSV in step S11,
Further, in step S12, the feed counter SCNT is set to "1".
Set.

When the processing of step S12 or step S14 is performed, the feed counter SCN is subsequently sent in step S15.
It is checked whether the count value of T exceeds "30".

If the count value of the feed counter SCNT exceeds "30", then in step S16 the feed side stop flag OSTPF is set to "1" and the process exits. Further, if the count value of the feed counter SCNT does not exceed "30", this processing is directly terminated.

If the count value of the winding counter MCNT exceeds "40" in the check in step S8, the winding side stop flag MSTPF is determined in step S17.
Set “1” to.

Subsequently, in step S18, it is checked whether or not the feed side stop flag OSTF is "1". If the feed side stop flag OSTPF is "1", the ribbon end flag REF is set to "1" in step S19. To exit this process. Further, the sending side stop flag OSTPF is "1".
If not, in step S20, the label jam flag LJ
Set "1" to F and exit this process.

In an embodiment having such a structure, CP
U51 samples the output of the winding-side sensor 36 at intervals of 5 msec, reads the winding-side slit value, saves the slit value at that time in the memory SMSV if it is the first time, and sets "1" in the winding counter MCNT. Set.

After that, until a change in the slit value is detected twice, for example, if the output of the winding-side sensor 36 is at a high level, the slits are once at a low level and then again at a high level. The value is sampled and the winding counter MCNT is incremented.

Further, the CPU 51 samples the output of the supply side sensor 35 at intervals of 5 msec, reads the supply side slit value, saves the slit value at that time in the memory SOSV if it is the first time, and stores it in the feed counter SCNT. 1 ”is set.

After that, the slit value is sampled at intervals of 5 msec and the feed counter SCNT is incremented until a change in the slit value is detected twice.

If the count value of the feed counter SCNT exceeds 30 in this state, the feed side stop flag OS
Set "1" to TPF.

Since the time until the change in the slit value is detected twice is 50 msec at the minimum and 100 msec at the maximum, the count value by sampling at 5 msec indicates that the ink transfer ribbon 28 is from the ribbon feed roller 27. As long as it is fed normally and is normally wound by the ribbon winding roller 30, the minimum is "10" and the maximum is "2".
It becomes "0".

Therefore, in this embodiment, on the ribbon feed roller side, the allowable maximum count value of the feed counter SCNT is set to "30", and when the count value of the feed counter SCNT exceeds this value, the ribbon feed roller 27 is stopped. Therefore, the sending side stop flag OSTPF is set to "1".

On the ribbon winding roller side, the maximum allowable count value of the winding counter MCNT is "40".
When the count value of the winding counter MCNT exceeds this value, it is determined that the ribbon winding roller 30 is in the stopped state, and the winding side stop flag MSTPF is set to "1".
Set.

The reason why the allowable maximum count value of the feed counter SCNT is "30" and the allowable maximum count value of the take-up counter MCNT is "40" is different. This is to ensure the distinction between the ribbon end and the paper jam of the label paper after that.

Therefore, when the ribbon end state is reached, the ribbon feed roller 27 and the ribbon take-up roller 30 both stop rotating, so that the slit disks 33 and 34 also do not rotate.

For this reason, the count value of the feed counter SCNT exceeds the allowable maximum count value "30" before the supply side sensor 35 for detecting the slit of the slit disk 33 detects the change of the slit value twice. Then, the sending side stop flag OSTPF is set to "1".

After that, the count value of the winding counter MCNT exceeds the allowable maximum count value "40" before the winding side sensor 36 for detecting the slit of the slit disk 34 detects the change of the slit value twice. Therefore, "1" is set to the take-up side stop flag MSTPF.

Then, the sending side stop flag OSTPF has already been set.
Is set to "1", the ribbon end is discriminated and the ribbon end flag REF is set to "1". As a result, the printing operation is stopped and the display unit 5
An error display by the ribbon end will be displayed on 8.

When the label paper 25 becomes jammed near the thermal print head 21, the ribbon feed roller 2
7 rotates normally to feed the ribbon, but since the ink transfer ribbon 28 is not fed from the thermal print head 21, the ribbon take-up roller 30 is stopped.

Therefore, the count value of the feed counter SCNT does not exceed the allowable maximum count value of "30", but the count value of the winding counter MCNT exceeds the allowable maximum count value of "40". Become.

Therefore, when the count value of the winding counter MCNT exceeds the maximum permissible count value "40", the feed side stop flag OSTPF remains "0", so that the jam of the label paper is judged and the label jam flag LJF is set. "1" is set. As a result, the printing operation is stopped and the display unit 58 displays an error due to a paper jam of the label paper.

Further, when the ink transfer ribbon 28 is broken, the ribbon take-up roller 30 is no longer tensioned by the ink transfer ribbon.
The load on the ribbon winding roller 30 is reduced, and the ribbon winding roller 30 rotates faster.

Therefore, the time taken for the output of the winding side sensor 36 to change from high level to low level and then to high level again becomes extremely short, and even if the slit value is changed a second time, the winding counter The count value of MCNT does not reach "10". At this time, the ribbon cut flag RCF is set to "1". This allows
When the printing operation is stopped, an error message is displayed on the display unit 58 due to the ribbon shortage.

As described above, the ribbon end and the ribbon breakage can be detected by the rotation state of the ribbon feed roller 27 and the ribbon take-up roller 30 without disposing a sensor near the ink transfer ribbon 28. Therefore, there will be no situation in which ribbon dust is accumulated in the sensor and the operation becomes unstable, or static electricity of the ink transfer ribbon acts on the sensor to cause the sensor to malfunction. It is possible to detect disconnection reliably.

Further, the ribbon feed roller 27 and the ribbon take-up roller 3 are arranged without arranging the sensor near the label paper 25.
A paper jam of the label paper can be detected by the rotation state of 0. Therefore, there is no possibility that the label paper dust will accumulate on the sensor and make the operation unstable, or the static electricity of the label paper will act on the sensor to cause the sensor to malfunction. You can reliably detect paper jams.

When the ink transfer ribbon 28 is used, the winding diameter of the ink transfer ribbon 28 gradually changes, and when the winding roller 30 is rotated with a constant torque, the tension applied to the ink transfer ribbon 28 changes. However, the tension applied to the ink transfer ribbon 28 can be kept constant by changing the winding torque of the motors 59 and 60 according to the rotation speeds of the supply side sensor 35 and the winding side sensor 36. it can.

It should be noted that the operation and effect are the same when the tag paper is used instead of the label paper in the above-mentioned embodiment.

Although the above embodiments have described the invention in which the present invention is applied to a label printer, the present invention is not necessarily limited to this. The point is that a transfer type printer for printing using an ink transfer ribbon is used. Good.

[0071]

As described above in detail, according to the invention according to claim 1, the ribbon end can always be reliably and reliably detected without using a sensor.

According to the second aspect of the invention, it is possible to always reliably and reliably detect the clogging of the print medium without using a sensor.

Furthermore, according to the third aspect of the invention, the ribbon end, the jam of the print medium and the ribbon break can be reliably detected without using a sensor.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a ribbon feeding roller unit of the embodiment.

FIG. 3 is a block diagram showing a circuit configuration of the embodiment.

FIG. 4 is a diagram showing a main part memory configuration in a RAM of the same embodiment.

FIG. 5 is a view showing a slit value change and a slit value sampling timing in the embodiment.

FIG. 6 is a flowchart showing an error monitoring process by the CPU of the embodiment.

FIG. 7 is a schematic configuration diagram showing a conventional example.

[Explanation of symbols]

 21 ... Thermal print head 22 ... Platen 25 ... Label paper (printing medium) 27 ... Ribbon feeding roller 28 ... Ink transfer ribbon 30 ... Ribbon winding roller 33, 34 ... Slit disk 35 ... Supply side sensor 36 ... Winding side sensor 51 ... CPU (central processing unit)

Claims (3)

[Claims] 1. A transfer printer in which an ink transfer ribbon and a print medium are passed between a print head and a platen, and the ink is transferred onto the print medium by the print head to perform printing. A ribbon feed roller that feeds a ribbon between the print head and the platen, a ribbon take-up roller that winds up the used ink transfer ribbon, and a feed-side rotation speed detection unit that detects the rotation speed of the ribbon feed roller. And a winding-side rotation speed detecting means for detecting the rotation speed of the ribbon winding roller, and detecting whether or not the feeding-side rotation speed detected by the feeding-side rotation speed detecting means is within a preset allowable range. Whether the first speed detecting means and the winding side rotation speed detected by the winding side rotation speed detecting means are within a preset allowable range. And the second rotation speed detected by the second speed detection means and the first rotation speed detection means is less than the allowable range, and the second rotation speed detected by the second speed detection means is less than the allowable range. And a ribbon end judging means for judging the ribbon end at this time. 2. A transfer printer in which an ink transfer ribbon and a medium to be printed are passed between a print head and a platen to transfer the ink onto the medium to be printed by the print head to perform printing. A ribbon feed roller that feeds a ribbon between the print head and the platen, a ribbon take-up roller that winds up the used ink transfer ribbon, and a feed-side rotation speed detection unit that detects the rotation speed of the ribbon feed roller. And a winding-side rotation speed detecting means for detecting the rotation speed of the ribbon winding roller, and detecting whether or not the feeding-side rotation speed detected by the feeding-side rotation speed detecting means is within a preset allowable range. Whether the first speed detecting means and the winding side rotation speed detected by the winding side rotation speed detecting means are within a preset allowable range. And the second rotation speed detected by the first speed detection means is within an allowable range, and the second rotation speed detected by the second speed detection means is less than the allowable range. In this case, a transfer type printer is provided with a jam judging means for judging the clogging of the printing medium. 3. A transfer printer in which an ink transfer ribbon and a print medium are passed between a print head and a platen, and the ink is transferred onto the print medium by the print head for printing. A ribbon feed roller that feeds a ribbon between the print head and the platen, a ribbon take-up roller that winds up the used ink transfer ribbon, and a feed-side rotation speed detection unit that detects the rotation speed of the ribbon feed roller. And a winding-side rotation speed detecting means for detecting the rotation speed of the ribbon winding roller, and detecting whether or not the feeding-side rotation speed detected by the feeding-side rotation speed detecting means is within a preset allowable range. Whether the first speed detecting means and the winding side rotation speed detected by the winding side rotation speed detecting means are within a preset allowable range. And the second rotation speed detected by the second speed detection means and the first rotation speed detection means is less than the allowable range, and the second rotation speed detected by the second speed detection means is less than the allowable range. At this time, the ribbon end determination means for determining the ribbon end and the feed side rotation speed detected by the first speed detection means are within the allowable range, and the winding side rotation speed detected by the second speed detection means is within the allowable range. If it is less than the following, a jam judging means for judging clogging of the print medium and a ribbon break judging means for judging ribbon break when the winding side rotation speed detected by the second speed detecting means exceeds an allowable range. A transfer type printer characterized by being provided.