JPH0976599A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer fast in the response of gap adjustment and capable of accurately and rapidly adjusting a gap. SOLUTION: A printer is equipped with the carriage 11 capable of reciprocally moving along a platen 1 loaded with a printing head 2 and the eccentric guide shaft (carriage guide shaft) 7 guiding the reciprocal movement of the carriage 11 and allowing the carriage to advance to and retreat from the platen 1 and a lever mechanism 13 detecting the thickness of paper P and a paper position detection means 11A are provided to the carriage 11. A gap adjusting control part (CPU) controlling the driving of the eccentric guide shaft 7 by a predetermined angle on the basis of the paper data from the lever mechanism 13 and a paper position detection means 11A to set the gap between the printing head 2 and the platen 1 to the optimum value is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer device, and more particularly to a printer device having platen gap automatic adjustment means for detecting the thickness of printing paper and automatically adjusting the platen gap to an optimum value.

[0002]

2. Description of the Related Art Conventionally, as a printer device of this type,
For example, there is one disclosed in Japanese Patent Laid-Open No. 2-1356.

In this conventional example, as shown in FIGS. 4A and 4B, a frame 59 having a carriage guide shaft 54 for adjusting a relative gap between a carriage 52 having a print head 51 mounted thereon and a platen 53. A base member 60 is provided with a lever member composed of a sheet thickness detection lever 55 that can be brought into contact with and separated from the surface of the platen 53, and a displacement detection means 56 that detects the amount of displacement of this lever member from the surface of the platen 53. . Then, based on the detection signal from the displacement detecting means 56, a control means (not shown) controls the carriage guide shaft 54 described above.

Next, the operation will be described. First, when the paper P is detected with the carriage 52 carrying the print head 51 being once moved to the position of the reference gap, the platen 53 without the paper P is detected. The lever member (that is, the paper thickness detection lever) 55 is once brought into contact with the surface, and the displacement amount of the lever member (paper thickness detection lever) 55 at that time is stored in the memory (memory circuit). Next, the paper P is placed on the platen 53.
Then, the lever member 55 is brought into contact again and the displacement amount at that time is stored.

Then, the difference between the displacement amount when the paper P is present and the displacement amount when the paper P is not present is calculated by the CPU (calculation unit) to obtain the preset paper thickness and gap length. The gap adjusting motor 57 is controlled so as to satisfy the relationship, and the carriage guide shaft 54, which is an eccentric shaft, is rotated via the platen gap adjusting gear 58. This moves the carriage 52 toward the platen 53,
The gap between the print head 51 and the platen 53 is adjusted.

[0006]

However, in this conventional printer device, the platen gap automatic adjusting means is arranged so that the carriage 5 is located at the reference gap position.
2 is once moved, and then the lever member and the displacement detection means perform two detection operations for the case where the paper does not exist and the case where the paper exists, and the CPU calculates based on these two signals, and again based on the result. Since the platen gap is adjusted by moving the carriage 52, the response speed is poor.

Further, since the lever member 55 and the displacement detecting means for detecting the displacement amount thereof are attached to the frame 59 side instead of the carriage 52 side to detect the sheet thickness, the detected sheet thickness is detected. Since the carriage 52 moves only by the information, for example, when the platen diameter expands or contracts due to the temperature change of the use environment, the change in the platen surface position due to the expansion or contraction of the platen diameter cannot be detected even if the thickness of the sheet can be detected. Therefore, the carriage 52 cannot be moved so that the gap between the print head and the surface of the platen 53 has an optimum value for the thickness of the paper.

Further, as described above, since the lever member and the displacement detecting means for detecting the variation thereof are attached to the frame 59 side, there is no means for identifying the position of the inserted sheet, and therefore, There is a risk that the platen 53 may erroneously perform the thickness detection operation.

Further, in order to move the carriage 52 to a position serving as a reference cap, a platen gap adjusting gear 58 is fixed with a position inspection plate for converting the rotation amount of the gear into a light amount, and the frame has a position inspection plate. Since a method is provided in which a photo sensor that converts the rotation amount of the above into an electric signal is provided and the rotational position of the platen gap adjusting gear 58 is detected by this, there is a disadvantage that the entire apparatus becomes expensive.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a printer apparatus which solves the disadvantages of the prior art and, in particular, has a fast gap adjustment response and enables accurate gap adjustment to be performed quickly. , And its purpose.

[0011]

In order to achieve the above-mentioned object, in the invention according to claim 1, a print head arranged corresponding to a cylindrical platen, and supporting the print head and extending along the platen. Carriage that is reciprocally movable, a guide shaft that guides the reciprocating movement of the carriage and that moves the carriage forward and backward with respect to the surface of the platen, and a rotary drive of the guide guide shaft. And a knitting center guide shaft driving means.

A lever mechanism for detecting the thickness of the above-mentioned sheet on the platen is provided on the carriage, and based on the sheet thickness information detected by this lever mechanism, the above-mentioned lever guide mechanism is provided through the center guide shaft driving means. The knitting center guide shaft is driven by a predetermined angle to control the gap to set the gap between the print head and the platen to a predetermined size.

Then, the above-mentioned garage is equipped with a sheet position detecting means, and the gap adjusting control section controls the print head and the platen based on the sheet information from the sheet position detecting means and the sheet thickness information from the lever mechanism. It is configured to have a gap calculation function that calculates the size of the gap between and in real time.

Therefore, according to the first aspect of the present invention,
The paper position detection means functions to make it possible to reliably stop the carriage at the position where there is paper, and the conventional one required two measurements with and without paper, but once. It is possible to adjust the gap by measuring the gap. Therefore, the gap adjustment can be performed more quickly than the conventional one, and the position interval between the platen and print head is automatically adjusted to the optimum printing interval according to the paper thickness. Can be set.

According to a second aspect of the present invention, the above-mentioned knitting guide shaft driving means is provided with a driving motor and a gear mechanism for reducing the rotational speed of the driving motor and transmitting the decelerated rotation speed to the knitting guide shaft. To do. Then, a configuration is adopted in which the above-mentioned gear mechanism is equipped with a sliding clutch that functions when an excessive load is applied to the drive motor described above. Therefore, in the invention described in claim 2, in addition to functioning similarly to the invention described in claim 1, it is possible to effectively cope with the overload of the drive motor in particular and to improve the durability. .

According to the third aspect of the present invention, the above-mentioned knitting guide shaft driving means is provided with a rotation regulating mechanism for regulating the allowable rotation range and the retracting reference position of the knitting guide shaft. Therefore, the invention according to claim 3 functions in the same manner as the invention according to claim 1 described above, and in particular, the rotational position of the center guide shaft can be effectively and automatically adjusted.

According to a fourth aspect of the present invention, the above-described rotation restricting mechanism is provided on a part of one gear of the gear mechanism,
A method is adopted in which the knitting guide shaft is formed by a rotation allowable range setting groove provided in a frame that corresponds to the protrusion. Therefore, the invention according to claim 4 functions in the same manner as the invention according to claim 1 described above, and in particular, the rotation restricting mechanism can be easily obtained with high accuracy, at low cost.

According to the fifth aspect of the invention, the gap adjusting control section has a motor stop control function for immediately stopping the drive motor when the drive motor is unnecessarily loaded. The composition is adopted.
Therefore, the invention according to claim 5 functions in the same manner as the invention according to claim 1 described above, and in particular, the rotation restricting mechanism can be easily obtained with high accuracy and at low cost.

According to a sixth aspect of the invention, a method is adopted in which the above-mentioned sheet position detecting means is constituted by a reflection type optical sensor including a light emitting element and a light receiving element. Therefore, the invention according to claim 6 functions in the same manner as the invention according to claim 1 described above, and particularly the sheet position detecting means can be made highly accurate.

[0020]

Next, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a cylindrical platen, and reference numeral 2 indicates a print head arranged corresponding to the platen 1. The print head 2 is supported on a carriage 11 that is reciprocally movable along the platen 1. Further, reference numeral 7 denotes a carriage guide shaft as a knitting guide shaft that functions to guide the reciprocating movement of the carriage 11 and to move the carriage 11 forward and backward with respect to the surface of the platen 1. The carriage guide shaft (knitting center guide shaft) 7 is rotationally driven by the knitting center guide shaft driving means 3.

A lever mechanism 13 for detecting the thickness of the sheet on the platen 1 is mounted on the carriage 11. The paper thickness information detected by the lever mechanism 13 is sent to the CPU 21 as a gap adjusting control unit, and the carriage guide shaft 7 is moved through the knitting guide shaft driving unit 3 at a predetermined angle based on a command from the CPU 21. Drive control is performed so that the gap between the print head 2 and the platen 1 is set to a predetermined size.

Further, the garage 11 is equipped with a sheet position detecting sensor 11A as sheet position detecting means. Then, the sheet thickness information detected by the sheet position detection sensor 11A is stored in the CPU 2 as the gap adjusting control unit.
It is sent to 1. The CPU 21 as the gap adjusting control unit determines the size of the gap between the print head 2 and the platen 1 based on the paper information from the paper position detection sensor 11A and the paper thickness information from the lever mechanism 13. It has a gap calculation function that calculates in real time. Here, the sheet position detection sensor 11A is configured by a reflection type optical sensor including a light emitting element and a light receiving element.

The knitting center guide shaft driving means 3 reduces the rotational speed of the gap adjusting motor 3A as a drive motor and the gap adjusting motor 3A and transmits it to the above-mentioned carriage guide shaft (knitting guide shaft) 7. The gear mechanism 5 is provided. The sliding clutch (not shown) that operates when the gap adjusting motor (driving motor) 3A is loaded with an unnecessarily large amount of load is the gear mechanism 5 described above.
Is equipped with

Further, the knitting guide shaft driving means 3 is provided with a rotation regulating mechanism for regulating the allowable rotation range of the carriage guide shaft (knitting guide shaft) 7. The rotation restricting mechanism includes a protrusion 6a provided on a drive gear (platen gap adjusting gear) 6 at the final stage of the gear mechanism 5 and a frame 20 supporting the carriage guide shaft 7 corresponding to the protrusion 6a. It is constituted by the rotation allowable range setting groove 20a provided.

The above-mentioned CPU (gap adjustment control unit)
Reference numeral 21 is provided with a motor stop control function for immediately stopping and controlling the motor 3A for gap adjustment (drive motor) when a load more than necessary is applied.

This will be described in more detail. In FIG. 1, a platen 1 is rotatably provided on a frame 2, and a carriage guide shaft (knitting center guide shaft) 7 is provided in front of the platen 1 in parallel with the shaft of the platen 1. Are arranged. An eccentric shaft portion 7a is eccentrically provided at the end of the carriage guide shaft 7, and is rotatably attached to the frame 20 by the eccentric shaft portion 7a. Further, a platen gap adjusting gear 6 is fixed to the eccentric shaft portion 7a, and is connected to the gap adjusting motor 3A via transmission gears 5a, 5b, 5c and a motor gear 3a.

A projecting portion 6a is provided on a part of the outer periphery of the platen gap adjusting gear 6 and is fitted in a window portion (allowable rotation range setting groove) 20a opened in the frame 2.
The projection 6a of the platen gap adjusting gear 6 and the window portion (allowable rotation range setting groove) 20a of the frame 20 constitute the rotation restricting mechanism as described above.

Carriage 11 for mounting print head 2
Is a timing belt 8 which is supported by the carriage guide shaft (knitting center guide shaft) 7 and a fixed guide shaft 9 which is parallel to the carriage guide shaft 7 and which is stretched between the carriage drive motor 19 (see FIG. 2) and the idle roller 10. By Platen 1
The carriage guide shaft (knitting guide shaft) 7 can be moved back and forth in the front-back direction by the eccentric rotation of the carriage guide shaft (knitting guide shaft) 7. Further, the carriage 11 is equipped with a sheet position detecting means 11A including a light emitting element and a light receiving element.

Here, with the paper P mounted on the platen 1, the carriage drive motor 19 causes the carriage 1 to move.
Carriage 1 while reciprocating 1 in the platen axis direction
When light is emitted from the light emitting element 11a of the sheet position detecting means 11A attached to sheet 1, the light receiving element 11b receives the reflected light from the sheet P and the platen 1. If the platen 1 is black while the paper P is white, the respective reflectances are different, so that the position of the paper P can be detected.

Further, the gap adjusting motor 3A is driven, the gap adjusting gear 6 is rotated through the motor gear 3a and the transmission gears 5a, 5b, 5c, and the carriage 11 retreats in the direction away from the platen 1 and finally the platen. When the protruding portion 6a of the gap adjusting gear 6 comes into contact with the end of the window portion (allowable rotation range setting groove) 20a of the frame 20, the rotation of the platen gap adjusting gear 6 is forcibly stopped.

In this case, in this embodiment, the transmission gear 5
Any one of a, 5b, and 5c is a torque clutch gear having a built-in torque clutch that disconnects the transmission of torque due to slippage of the clutch plate when a torque of a certain level or more is applied, and the platen gap adjusting gear 6 has a gap adjusting motor. 3A
The structure in which the torque is disengaged by the torque clutch gear when an excessive amount of torque is transmitted from the transmission gears 5a, 5b, 5c and the platen gap adjusting gear 6 is prevented. . By such means, the position of the carriage 11 when the rotation of the platen gap adjusting gear 6 is forcibly stopped is the retracted position, which is the reference position for the forward movement of the carriage 11.

Further, the carriage 11 is provided with the lever mechanism 13 as described above. This lever mechanism 13
The rising holding plate 1 provided next to the above-mentioned print head 2
A sheet thickness detection lever 13A rotatably mounted about a support shaft 12 mounted on 1P, a solenoid 14 for biasing the sheet thickness detection lever 13A at a position apart from the platen 1 for ups and downs, and a sheet. A lever position detection sensor 16 for detecting the operating position of the thickness detection lever 13A and a lever spring 15 for returning the original position of the paper thickness detection lever 13A are provided.

Here, the solenoid 14 is not normally driven, and the plunger 14a is the solenoid spring 1
4b pushes down the rear portion of the sheet thickness detection lever 13A, and the front end of the sheet thickness detection lever 13A is rearwardly moved away from the platen 1 to maintain the state.
4 is driven, the plunger 14a resists the force of the solenoid spring 14b and the paper thickness detecting lever 13A
The restriction is released by moving away from the rear portion, and the lever spring 15 attached to the rear end of the sheet thickness detecting lever 13A is arranged so that the front end of the sheet thickness detecting lever 13A rotates forward in the direction of approaching the platen 1. Further, the lever position detection sensor 16 is configured to switch by the movement of the paper thickness detection lever 13A.

Here, as the lever position detecting sensor 16, a photo sensor including a light emitting element and a light receiving element is used. Then, when the sheet thickness detection lever 13A passes between the light emitting element and the light receiving element, the amount of light from the light emitting element to the light receiving element changes. Since an electric signal is output from the light receiving element according to this change in the light amount, the lever position detection sensor 16 is switched with the movement of the paper thickness detection lever 13A.

FIG. 2 shows the configuration of the platen gap control system in this embodiment. The platen gap control system controls the movement of the paper thickness detection lever 13A by the lever position detection sensor 1
Storage circuit 21A for storing the drive amount of the gap adjusting motor 3 from the time when the platen gap adjustment is completed until the platen gap adjustment is completed.
And a CPU (central processing unit) 21 that controls the platen gap adjustment operation, and a host device 30 such as a personal computer.
The print signal from the printer is input, and the gap adjusting motor 3A, the carriage driving motor 19, and the solenoid 14 are controlled based on a flowchart described later.

Next, the operation of the apparatus of the present embodiment thus constructed will be described with reference to the flow chart of FIG.

[Initial Adjustment] When the platen 1 does not have the paper P, the gap adjusting motor 3A is driven to eccentrically rotate the carriage guide shaft 7 to retract the carriage 7. When the projection 6a comes into contact with the end of the window 20a of the frame 2 due to the rotation of the platen gap adjusting gear 6, the platen gap adjusting gear 6 cannot rotate any more, and the gap adjusting motor 3A stops and the carriage 11 of the carriage 11 moves. Retreat stops. This retracted position is used as a reference position for the forward movement of the carriage 11.

When the solenoid 14 is driven in this state,
The lever spring 15 causes the leading end of the sheet thickness detection lever 13A to rotate forward in a direction toward the platen 1. Next, the gap adjusting motor 3A is driven in the opposite direction to the above to move the carriage 11 forward so as to approach the platen 1. During the forward movement, the tip of the sheet thickness detecting lever 13A comes into contact with the surface of the platen 1, and the sheet thickness detecting lever 13A starts to roll backward as the carriage 11 moves forward, and the lever position detection sensor 16 is switched by the movement. It

From the time when the lever position detection sensor 16 is switched, the gap adjusting motor 3A is further controlled to be driven by a preset rotation amount N ₁ , and the carriage 11 is moved forward to the vicinity of the desired platen gap position. To reach. Rotation amount N ₁ of this gap adjustment motor 3A
Is calculated in advance so as to satisfy the relationship between the sheet thickness and the gap, and is stored in the storage circuit 21A.

On the other hand, the carriage 11 may not stop at the correct platen gap position even if the gap adjusting motor 3A is driven by the calculated rotation amount N _{1 due} to variations in the precision of the parts constituting this apparatus. is there.

Therefore, the platen gap at the position of the stopped carriage 11 is measured with a gauge or the like to find the difference from the desired platen gap, and the difference is converted into the amount of rotation of the gap adjusting motor 3, and the difference is calculated. The rotation amount N ₁ is adjusted and adjusted, and the adjusted rotation amount N2 is stored again in the storage circuit 21A.

[Platen Gap Adjustment Operation] When the printer is powered on for printing (step S1), the gap adjusting motor 3A is driven to drive the carriage guide shaft 7.
Is eccentrically rotated to retract the carriage 11 and stop at the retracted position, which is the reference position for the forward movement of the carriage 11 (step S2).

When the sheet P is sucked into the platen 1 (steps S3 and S4) and a print signal is input from the host device 30 (step S5), the carriage 11 moves in the platen axis direction by the carriage drive motor 19 (step S5). Step S6), the light emitting element 11a and the light receiving element 11b of the sheet position detecting means 11A attached to the carriage 11.
The position of the paper P mounted on the platen 1 is detected by the step S7, and the carriage 11 is moved to the position where the paper P is present.
To stop. This is for surely performing the platen gap adjustment on the printing surface of the paper P, and for preventing the platen 1 from performing the platen gap adjustment by mistake.

In this state, the solenoid 14 is driven and the lever spring 15 causes the tip of the sheet thickness detecting lever 13A to rotate forward (step S8). Next, the gap adjusting motor 3A is driven in the opposite direction to the above, and the carriage 11 is moved forward so as to approach the platen 1 (step S9).

During this forward movement, the paper thickness detection lever 1
The front end of 3A contacts the surface of the paper P mounted on the platen 1, and the paper thickness detection lever 13A starts to move backward as the carriage 11 moves forward (step S10), and the movement causes the lever position value detection sensor 16 to move. It is switched (step S11).

From this point, the gap adjusting motor 3 is further added.
A is controlled to be driven by the rotation amount N ₂ stored in the storage circuit 21A, the carriage guide shaft 7 is eccentrically rotated to move the carriage 11 forward in the platen 1 direction (step S12), and the print head 2 and the platen 1 are moved. The gap between and is adjusted to an optimum value for the thickness of the paper P to be printed (step S13). After that, the driving of the solenoid 14 is stopped,
The sheet thickness detecting lever 13A is rotated backward by the plunger 14a and the solenoid spring 14b (step S1.
4) Printing is started (step S15).

Although the platen gap adjusting method according to the thickness of the paper P mounted on the platen 1 has been described above, the platen gap automatic adjusting means described above can also measure the thickness of the paper P. is there.

In this case, first, in the initial adjustment stage, with the paper P not present, the rotation amount N of the gap adjusting motor 3A from the reference position where the carriage 11 is retracted to the time when the lever position detecting sensor 16 is switched. ₀₁ to C
It is counted by the PU 21 and stored in the memory circuit 21A. Next, in the platen gap adjusting operation, the thickness T
Similarly, in the state where the paper P is loaded, the CPU 21 counts the rotation amount N ₀₂ of the gap adjusting motor 3A from the reference position value at which the carriage 11 is retracted to the time when the lever position value detection sensor 16 is switched, It is stored in the storage circuit 21A.

The difference in the amount of rotation of the gap adjusting motor 3A with and without the paper P, that is, "N ₀₂ -N ₀₁ " is proportional to the thickness T of the paper P. Therefore, it is possible to recognize the thickness T of the loaded paper by calculating “N ₀₂ −N ₀₁ ” by the CPU 21.

In the above-mentioned embodiment, the lever position value detection sensor 16 is exemplified by the photo sensor including the light emitting element and the light receiving element, but the other three configurations described below may be used.

First, the lever position value detecting sensor 16 is a pressure sensitive element made of a pressure sensitive conductive rubber whose electric resistance changes with external pressure, and the paper thickness detecting lever 13A presses this pressure sensitive element to change the electric resistance. The change is output as an electric signal, and the lever position detection sensor 16 causes the paper thickness detection lever 1
It switches with the movement of 3A.

Further, the lever position value detecting sensor 16 is a leaf switch consisting of a pair of conductive plates having a contact gap, and the sheet thickness detecting lever 13A pushes down the conductive plate to set the pair of conductive plates. Contact is made to form an electrically closed circuit, and current is applied. This energization is output as an electric signal, and the lever position value detection sensor 16 switches in accordance with the movement of the sheet thickness detection lever 13A.

Furthermore, the lever position value detection sensor 16 is
A micro switch composed of a fixed contact plate and a movable contact plate with a minute contact gap and an actuator for moving the movable contact plate. When the paper thickness detection lever 13A presses the actuator, the movable contact plate comes into contact with the fixed contact plate. To form an electrically closed circuit, and electricity is supplied. This energization is output as an electric signal, and the lever position value detection sensor 16 switches in accordance with the movement of the sheet thickness detection lever 13A.

[0055]

Since the present invention is constructed and functions as described above, according to this, the garage is equipped with the paper position detecting means, and the paper information from the paper position detecting means and the paper thickness information from the lever mechanism are provided. Based on the above, the gap adjustment control unit calculates the size of the gap between the print head and the platen in real time, so the conventional type requires two measurements with and without paper. On the other hand, it is possible to adjust the gap with a single measurement, which makes it possible to perform the gap adjustment more quickly than the conventional one, and adjust the position gap between the platen and print head according to the paper thickness. The optimum print interval can always be set automatically, and in this respect, the print quality can be kept good regardless of the paper thickness and the reliability of the entire device can be improved. It is possible to provide an excellent printer not to come.

[Brief description of drawings]

FIG. 1 is a partially omitted perspective view showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a control system of the embodiment disclosed in FIG.

FIG. 3 is a flowchart showing the operation of FIGS. 1 and 2.

FIG. 4 is a view showing a conventional example, FIG. 4 (a) is a plan view and FIG.
FIG. 4B is a left side view as seen from the direction of arrow A in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 platen 2 print head 3 knitting center guide shaft driving means 3A motor for gap adjustment as drive motor 5 gear mechanism 6 platen gap adjusting gear 6a protrusion 7 carriage guide shaft as knitting guide shaft 11 carriage 11A as paper position detecting means Paper position detection sensor 11a Light emitting element 11b Light receiving element 13 Lever mechanism 13A Paper thickness detecting lever 19 Carriage drive motor 20 Frame 20a Rotation allowance setting groove window 21A Memory circuit 21 CPU P paper as gap adjusting control paper

Claims (6)

[Claims] 1. A print head arranged corresponding to a cylindrical platen, a carriage that supports the print head and is capable of reciprocating along the platen, and guides reciprocating movement of the carriage. In addition, a centering guide shaft that functions to move the carriage forward and backward with respect to the surface of the platen, and a centering guide shaft driving unit that rotationally drives the centering guide shaft are provided, and the platen is provided on the carriage. A lever mechanism for detecting the thickness of the upper sheet is provided, and the knitting center guide shaft is driven and controlled by a predetermined angle based on the sheet thickness information detected by the lever mechanism. A printer device comprising a gap adjusting control unit for setting a gap between the print head and the platen to a predetermined size, With equipped with sheet position detection means di,
A gap calculation function in which the gap adjustment control unit calculates the size of the gap between the print head and the platen in real time based on the sheet information from the sheet position detection means and the sheet thickness information from the lever mechanism. A printer device comprising: 2. The knitting center guide shaft driving means comprises a drive motor and a gear mechanism for reducing the rotational speed of the driving motor and transmitting the decelerated rotation speed to the knitting center guide shaft.
2. The printer apparatus according to claim 1, wherein the gear mechanism is equipped with a sliding clutch that functions when an excessive load is applied to the drive motor. 3. The printer device according to claim 1, wherein the knitting guide shaft driving means is provided with a rotation regulating mechanism for regulating the allowable rotation range and the retracting reference position of the knitting guide shaft. 4. A rotation permissible range setting device, wherein the rotation restricting mechanism is provided on a protrusion provided on a part of a gear of the gear mechanism and a frame supporting the knitting guide shaft in correspondence with the protrusion. 4. The printer device according to claim 1, wherein the printer device comprises a groove. 5. The gap adjusting control unit has a motor stop control function for immediately stopping and controlling the drive motor when an excessive load is applied to the drive motor. , 2, 3 or 4 printer device. 6. The printer device according to claim 1, wherein the paper position detecting means is a reflection type optical sensor including a light emitting element and a light receiving element.