JPH0880651A - Printer - Google Patents

Abstract

PURPOSE: To enhance reliability by making the force energizing the paper pressing roller supported on a paper pressing shaft to a paper feed roller constant by releasing the energizing force of the paper pressing roller to the paper feed roller when a release lever is revolved in the direction opposite to the rotary direction of a paper feed shaft. CONSTITUTION: The rotationally driven paper feed shaft 44 having a paper feed roller 54 arranged thereto, the paper pressing shaft 46 making a paper pressing roller 52 rotatable and attached to a frange 41 so as to prescribe the moving direction of the roller 52 and the energizing member energizing the paper pressing shaft 46 so as to bring the paper pressing roller 52 into contact with the paper feed roller 54 under pressure are provided. Further the release lever 119 having the cam part engaged with the paper pressing shaft 46 to move the paper pressing shaft 46 and attached to the frame 41 in a revolvable manner is provided. When the release lever 119 is revolved in the direction opposite to the rotary direction of the paper feed shaft 44, the paper pressing roller 62 releases the energizing force to the paper feed roller 54.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a release mechanism for inserting or removing recording paper in a printer.

[0002]

2. Description of the Related Art To explain this type of technology in detail, a release lever is rotatably arranged on a shaft, and when the release lever is rotated, a recording paper is pressed against a paper feed roller that is driven to rotate. In a printer equipped with a release mechanism in which the pressure of the paper pressing roller is released by the cam of the release lever, the center of rotation of the release lever is the bearing of the paper feed shaft that has the rotated paper feed roller on the shaft. Also, the rotation direction of the release lever for releasing the pressure contact of the paper pressing roller is the same as the rotation direction of the paper feeding shaft.

[0003]

In the printer having the structure described above, since the bearing of the paper feed shaft is used, the release lever always rotates in the rotational direction of the paper feed shaft due to the rotation of the paper feed shaft. The paper feed shaft rotates in the rotation direction of the paper feed shaft, but since the release lever releases the paper press roller and the paper feed shaft rotates in the same direction,
Since the release lever receives a torque in the releasing direction from the paper feed shaft, as a result, the pressing force with which the paper pressing roller presses against the paper feed roller is reduced and becomes unstable, leading to paper feeding failure. Was there.

Therefore, the present invention solves such a problem, and an object of the present invention is to prevent the paper pressing shaft from being affected by the release lever even while the printer is operating, and to press the paper pressing shaft to the paper feeding roller. It is an object of the present invention to provide a printer in which the force of the paper pressing roller pivotally supported on the printer can be kept constant and the reliability is improved.

Another object of the present invention is to provide an inexpensive printer with improved assemblability.

[0006]

In order to solve the above-mentioned problems, the printer of the present invention is provided with a paper feed shaft in which a paper feed roller is arranged and is driven to rotate, and a paper pressing roller which is rotatably provided and has a movement direction. The paper pressing shaft that is regulated and attached to the frame, the urging member that urges the paper pressing shaft so that the paper pressing roller presses the paper feeding roller, and the paper pressing shaft that moves by engaging with the paper pressing shaft The cam has a release lever that is rotatably attached to the frame and has a cam. When the release lever rotates in the direction opposite to the rotation direction of the paper feed shaft, the paper pressing roller releases the bias of the paper feed roller. It is characterized by being done.

Further, the release lever is characterized in that the engaging portion with the paper pressing shaft is provided with a restricting portion for restricting the rotation of the release lever, and the restricting portion of the release lever is the paper pressing roller. Is provided on the operating side where the urging of the paper feed roller is released, and further, the restriction portion of the release lever is provided on the standby side where the cam portion does not engage with the paper pressing shaft. It is characterized by

Furthermore, the release lever is provided with a range restricting part for restricting the range of rotation of the release lever at an engaging part with the paper pressing shaft, and when the release lever is rotated on both sides of the range restricting part. An introduction cam portion for guiding the paper pressing shaft to the range restricting portion is arranged.

[0009]

In the above structure, since the release lever is rotated in the direction opposite to the release direction from the paper feed shaft,
While the printer is operating, the cam portion does not engage with the paper pressing shaft, so the paper pressing shaft does not receive the force to move from the cam portion, and the paper pressing roller can maintain the predetermined biasing force against the paper feeding roller. it can.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a printer showing an embodiment of the present invention. The printer according to the first embodiment is roughly classified into a main body drive section (A section in FIG. 1), a carriage section (B section in FIG. 1), a paper feed mechanism section (C section in FIG. 1), and a paper guide section (D section in FIG. 1). Part)
-Around the ribbon cassette (E in Fig. 1) -Around the winding mechanism (F in Fig. 1) -Around the platen (G in Fig. 1) -Around the auto-cutter mechanism (H in Fig. 1). Each structure will be described below.

Around the main body drive (A portion in FIG. 1), the main body motor 1 serves as a drive source for reciprocating the print head 32 in the arrow a1 direction and the arrow a2 direction and a drive source for rotating the paper feed shaft 44.
And its power transmission mechanism.

The area around the carriage (section B in FIG. 1) is composed of a carriage 31 and a print head 32 which are axially supported by a carriage guide shaft front 34 and a carriage guide shaft rear 35.

Around the ribbon cassette (portion E in FIG. 1) is composed of a ribbon frame 71 and a ribbon cassette 81 accommodating an ink ribbon 82.

The area around the winding mechanism (portion F in FIG. 1) is composed of a winding frame 95 and a winding flange 94, and serves to wind up the printed journal paper 50.

2A and 2B are views of a printer according to an embodiment of the present invention around a paper feed mechanism (C portion in FIG. 1) and a paper guide mechanism (D portion in FIG. 1).
FIG. 3 is a perspective view showing a structure around the auto cutter mechanism (portion H in FIG. 1).

Reference numeral 61 is a paper guide fixed to the main body frame 20 with screws by rotatably supporting the R side guide roller 63 and the J side guide roller 64, and 62 is a paper guide plate fixed to the paper guide 61. A cutter sensor 140 is fixed to the paper guide 61 and detects the position of the cutter driving gear 138 in the rotational direction by a slit plate 138-1, and a cutter motor gear 131 has a cutter motor gear 131, and a cutter earth plate 132 is sandwiched between the cutter sensor gear 130 and the cutter ground gear 132. The fixed cutter motor 134 is a cutter first reduction gear that is axially supported by the cutter first reduction gear shaft 141 fixed to the paper guide 61 and meshes with the cutter motor gear 131.

Reference numeral 135 denotes a cutter second reduction gear that is pivotally supported by a cutter second reduction gear shaft 142 fixed to the paper guide 61 and meshes with the cutter first reduction gear. Reference numeral 136 denotes a cutter transmission fixed to the paper guide 61. A cutter transmission gear 138 axially supported by the gear shaft 143 and meshed with the second reduction gear of the cutter 138 is a cutter drive pin 139 fixed to the side surface and a shield plate 138-
1 has a cutter drive gear shaft 14 fixed to the paper guide 61
4 is a cutter drive gear that is axially supported by 4 and meshes with the cutter transmission gear. When the cutter motor gear 131 rotates in the arrow b1 direction, the cutter drive gear rotates in the arrow c1 direction, and when the cutter motor gear 131 rotates in the arrow b2 direction, the cutter drive gear rotates in the arrow c2 direction.

Reference numeral 41 denotes a paper feed frame having a paper feed mechanism portion, which is fixed to the main body frame 20 with a screw. Reference numeral 149 denotes a cutter blade receiver which has a hole 149-1 and is fixed to the paper feed frame with screws, and 145 has an elongated hole 145-1 which engages with the cutter drive pin 139 and an elongated hole 146 of the cutter blade 146. A cutter lever 147 rotatably attached to a portion engaging with -1 has a lever portion 146-2, 147 is attached to 149 by a screw 148 and serves to guide the cutter blade 146 in the upper direction, and 150 is a cutter blade retainer. It is a hand-cutting cutter fixed to the cutter blade retainer 147. When the long hole 145-1 rotates in the direction of arrow d1, the lever portion 146-2 rotates in the direction of arrow e1.
When 45-1 rotates in the direction of arrow d2, lever portion 146-
2 rotates in the direction of arrow e2.

The internal structure of the cutter blade receiver 149 is shown in FIG.
As shown in FIG. 43 is a paper feed gear that is fixed to the paper feed shaft 44 and meshes with the gear of the paper feed pulley 42; 49 is a journal paper feed roller that is rotatably supported on the paper feed shaft 44 and is rotatable in the direction of arrow f1; 54 is a receipt paper feed roller which is supported on the paper feed shaft 44 and is selectively rotatable in the arrow f1 direction, 113 is an R-side paper presser shaft spring which serves to urge the paper presser shaft 46 in the arrow g1 direction, 114 Is a J-side paper pressing shaft spring that urges the paper pressing shaft 46 in the direction of arrow h1, and 45 is a J-side paper that is rotatably supported by the paper pressing shaft 46 and urges the journal paper 50 to the journal paper feed roller 49. Presser roller, 5
Reference numeral 2 denotes an R-side paper pressing roller which is pivotally supported by the paper pressing shaft 46 and urges the receipt paper 51 toward the receipt paper feeding roller 54.
110 is a paper exit guide fixed to the paper feed frame 41,
A paper outlet plate 111 is supported by the paper pressing shaft 46 and is given a rotational force in the arrow i1 direction by a paper outlet leaf spring 112. A paper outlet plate 119 functions as a bearing for the paper feed shaft 44 and rotates in the arrow j1 direction. As a result, the paper pressing shaft 46 is moved to the arrow g2.
R-side release lever having a function of moving in a direction, 12
Reference numeral 0 designates a J-side release lever which functions as a bearing of the paper feed shaft 44 and has a function of moving the paper pressing shaft 46 in the direction of arrow h2 by rotating in the direction of arrow k1.
R disposed adjacent to and engaged via a spring clutch
A side ratchet wheel 122, 122 is arranged adjacent to 49 and is engaged through a spring clutch, and a J side ratchet wheel 117 is on / off of engagement with the R side ratchet wheel 121 by control of the R side paper feed electromagnet 115. The R-side trigger lever 118 is controlled, and the J-side trigger lever 118 is controlled to turn on / off the engagement with the J-side ratchet 122 by controlling the J-side paper feed electromagnet 116. Figure 5
FIG. 2 is a detailed perspective view of a platen (a portion G in FIG. 1) of a printer according to an exemplary embodiment of the present invention.

The platen 100-1 is engaged with a hole formed in the main body frame 20 to smoothly move the platen 100 in the direction of the arrow n1 or n2 when setting a proper distance from the print head 32. It is a guide pin. Reference numeral 100-2 of the platen 100 is a screw hole for fixing to the main body frame 20 with a screw 103 after setting an appropriate gap with the print head 32. Reference numeral 100-3 of the platen 100 is a printing surface that receives the printing pressure of the print head 32 that forms graphics and characters by transferring the ink impregnated in the ribbon 82 onto the recording paper 50. The platen 100-4 is an R fixed to the platen 100.
The R-side paper guide portion is arranged at an arbitrary distance from the side auxiliary plate 101. Reference numeral 100-5 is an R-side paper guide portion arranged at an arbitrary interval with the J-side auxiliary plate 102 fixed to the platen 100.

The R side auxiliary plate 101 is a side surface guide portion 1 for arranging the recording paper 50 at an arbitrary position on the stamp surface 100-3.
01-1, 101-2 and the recording paper 50 on the platen 100
It has an R-shaped R paper pressing portion 101-3 for urging the stamp surface 100-3 of No. 3 and is fixed to the platen 100. The J side auxiliary plate 102 has a side surface guide portion 102-for arranging the recording paper 50 at an arbitrary position on the stamp surface 100-3.
1, 102-2, and an R-shaped J paper pressing portion 1 for urging the recording paper 50 against the stamp surface 100-3 of the platen 100.
02-3, and is fixed to the platen 100. R
The side auxiliary plate 101 and the J side auxiliary plate 102 are made of an elastic body having a spring property.

FIG. 6 is a sectional view of the receipt paper 51 around the platen of one embodiment of the present invention. The receipt paper 51 contacts the R-side guide roller 63 that is inserted from the direction of the arrow m1 and is pivotally supported by the paper guide 61, passes through the inside of the paper guide 61, and passes through the slit formed by the paper guide 61 and the paper guide plate 62. R side paper guide section 100 of the platen 100
-4 and the space formed by the R-side auxiliary plate 101 fixed to the platen 100.

The receipt paper 51 passes through a gap set by the R side paper guide portion 100-4 of the platen 100 and the R side auxiliary plate 101 and contacts the R shaped paper pressing portion 101-3 of the R side auxiliary plate 101. Then, the printing surface 100-3 of the platen 100 arranged at a position facing the print head 32 is urged. The receipt paper 51 passing through the stamp surface 100-3 is
The paper is fed by going to a paper feeding mechanism portion constituted by the receipt feeding roller 54, the R-side pressing roller 52 and the like, or by controlling the paper feeding mechanism portion.

The gap between the R-side paper guide portion 100-4 and the R-side auxiliary plate 101 and the R-paper pressing portion 101-3 are such that when the receipt paper 51 is inserted into the printer, the receipt paper 51 is printed on the printing surface 100 of the platen 100. It is set so that the load that contacts -3 is appropriate, and even if the receipt paper 51 is fed by the paper feed mechanism unit, the receipt paper 51 is set so as to always be in close contact with the stamp surface 100-3. J side paper guide section 100
-5 and the gap between the J side auxiliary plate 102 and the J paper pressing portion 102
The same applies to -3.

The platen 100 arranged at a position facing the print head sets an appropriate distance between the print head 32 and the printing surface 100-3 of the platen 100 in order to secure a clear print quality on the receipt paper 51. Therefore, it is necessary to move it in the direction of the arrow n1 or n2 and fix it to the main body frame 20 with the screw 103. At this time, the paper guide portion 100-4 of the platen 100 and the R auxiliary plate 101 and the J side auxiliary plate 102, which are made of an elastic body having a spring property and fixed to the platen 100, have a positional relationship with the stamp surface 100-3 of the platen 100. , And is fixed by moving in the direction of the arrow n1 or n2.

FIG. 7 is a side view of the R side release lever of the printer according to the first embodiment of the present invention in a standby state. FIG. 8 is a side view of the printer according to the first embodiment of the present invention when the R-side release lever operates. FIG. 9 is a side view of the printer according to the first embodiment of the present invention when the paper pressing shaft is erroneously inserted into the R side release lever.

A reference numeral 44 designates a paper feed shaft 44 having a R side release lever 119 as a bearing and a receipt paper feed roller 54 pivotally supported.
Reference numeral 46 denotes a paper pressing shaft 46 which axially supports an R-side paper pressing roller that serves to urge the receipt paper feeding roller 54.
The R-side release lever 119 is attached to the paper feed frame 41 having a shaft guide portion 41-1 that guides the paper pressing shaft 46, and includes a release cam portion 119-1, a regulating portion 119-2,
It has a rotation stopper 119-3, an insertion cam 119-4 and an insertion cam 119-5. p is the paper feed frame 41
Is a contact angle of the R side release lever 119 with respect to the paper pressing shaft 46 with respect to the shaft guide portion 41-1, and q is an R side release lever 119 with respect to the paper pressing shaft 46 with respect to the shaft guide portion 41-1 of the paper feeding frame 41. Is the contact angle of.

When the receipt paper 51 is inserted into the printer and fed, the R-side release lever 119 is operated in the direction of arrow j1 so as to be sandwiched between the receipt paper feed roller 54 and the R-side paper pressing roller 52. The R-side release lever 119 rotates about the paper feed shaft 44, the release cam portion 119-1 of the R-side release lever 119 contacts the paper pressing shaft 46, and the shape of the release cam portion 119-1 and the paper feed frame 41. The paper pressing shaft 46 is moved in the arrow g2 direction by the shaft guide portion 41-1.

By the movement of the paper pressing shaft 46, the paper pressing shaft 4
R side paper pressing roller 52 and paper feeding shaft 4 which are pivotally supported by 6
It is possible to secure an appropriate space for inserting the receipt paper 51 between the receipt paper feed roller 54 which is axially supported by the No. 4 shaft. Also, when removing the receipt paper 51 from the inside of the printer, it is also appropriate to operate the R release lever 119 in the direction of arrow j1 to remove the receipt paper 51 between the R side pressing roller 52 and the journal paper feed roller 54. It is possible to secure a wide interval.

The same applies to the J-side release lever 120. When the printer is operating, the motor 1
Rotation of the paper feed belt 7 causes the paper feed pulley 42 to rotate.
Rotates. By the rotation of the paper feed pulley 42, the paper feed gear 43 engaged with the paper feed pulley 42 and the paper feed shaft 44 fixed to the paper feed gear 43 rotate in the direction of arrow f1. The paper feed shaft 44 is attached to the paper feed frame 41 by R
Side release lever 119 and J side release lever 12
Supported by 0.

Therefore, the R side release lever 119 and J
The side release lever 120 always receives the rotational force in the direction of arrow f1 while the motor 1 is rotating. Therefore, in the printer of the present invention, it can be said that the rotation direction arrow f1 direction received by the R side release lever in the printer operating state and the direction arrow j1 direction operating the R side release lever are completely opposite directions.

When the R side release lever 119 is rotated in the direction of arrow j1, the rotation of the R side release lever 119 is R
The regulating portion 199-2 of the side release lever 119 hits the paper pressing shaft 46 and stops. The contact angle p of the R-side release lever 119 to the paper pressing shaft 46 with respect to the shaft guide portion 41-1 of the paper feed frame 41 is set to 0 ° to 90 °. Therefore, the regulating portion 119 of the R-side release lever 119
When -2 comes into contact with the paper pressing shaft 46, a force acts on the paper pressing shaft 46 in the direction of arrow g1. Therefore, the R-side release lever 1 119 is controlled by the R-side release lever 1 from the regulating portion 119-2.
19 does not rotate. Also, this regulation unit 119-2
Can also be prevented from coming off the shaft guide portion 41-1 of the paper feed frame 41.

When the R-side release lever 119 is in a standby state, an operator who operates the printer forcibly inserts or removes the receipt paper 51, and the R-side release lever 119 is forced to operate.
Is rotated in the direction of arrow f1, R side release lever 1
The rotation of 19 is the rotation stop portion 1 of the R side release lever 119.
99-3 hits the paper pressing shaft 46 and stops. The contact angle q of the R side release lever 119 with respect to the paper pressing shaft 46 with respect to the shaft guide portion 41-1 of the paper feeding frame 41 is from 0 ° to 9 °.
It is set to 0 °. Therefore, R side release lever 1
When the rotation stopping portion 119-3 of 19 contacts the paper pressing shaft 46, a force acts on the paper pressing shaft 46 in the direction of arrow q1. Therefore, the rotation stop portion 11 of the R side release lever 119
The R side release lever 119 does not rotate after riding on 9-3.

As shown in FIG. 9, when the paper pressing shaft 46 is assembled, the paper pressing shaft 46 is not set in the release cam portion 119-1 of the R side release lever 119, which is the normal position, and the insertion cam of the R side release lever 119 is not set. When the sheet is pressed in the vicinity of the portion 119-5 by mistake, by rotating the R-side release lever 119 in the direction of arrow j1, the paper pressing shaft 46 is inserted along the insertion cam portion 119-5 of the R-side release lever 119. The release cam portion 119-1, which is a normal position, is set over the R portion connecting the curve of -5 and the straight line of the rotation stopping portion 119-4. Therefore, the R-side paper pressing shaft spring 113 and the J-side paper pressing shaft spring having a strong load for urging the paper pressing shaft 46 in the direction of the arrow g1 are removed from the paper pressing shaft 46, and the paper pressing shaft 46 is released again. Part 1
There is no need to insert the sheet into 19-1 and re-engage the R-side paper pressing shaft spring 113 and the J-side paper pressing shaft spring.

[0035]

According to the printer constructed as described above, a paper feed shaft in which a paper feed roller is arranged and driven to rotate and a paper pressing roller are rotatably provided, and the movement direction is restricted. A presser shaft, and a biasing member that biases the paper presser shaft so that the paper presser roller comes into pressure contact with the paper feed roller,
It has a release lever rotatably attached to the frame, which is provided with a cam portion that engages with the paper pressing shaft and moves the paper pressing shaft, and the release lever rotates in a direction opposite to the rotation direction of the paper feeding shaft. The release lever is rotated to the standby side in the direction opposite to the release direction from the paper feed shaft because the paper press roller releases the bias to the paper feed roller. Since it does not engage with the paper pressing shaft, the paper pressing shaft does not receive the force to move from the cam part, the biasing force of the paper pressing roller against the paper feeding roller is stable, and the reliability of paper feeding can be greatly improved. It has become possible.

Further, since the release lever is provided with the restriction portion for restricting the rotation of the release lever at the engaging portion with the paper pressing shaft, the rotation area is fixed and the operation can be performed uncertainly. That is, the operability is improved.

Further, the release lever restricting portion is characterized in that the paper pressing roller is provided on the operating side where the urging of the paper feeding roller is released. Further, the release lever restricting portion is Since the cam part is provided on the standby side that does not engage with the paper pressing shaft, the standby position of the release lever is fixed and it is possible to check at a glance whether or not the release lever is in the standby state. It has become possible to drastically reduce feed defects.

Further, the release lever is provided with a range restricting part for restricting the range of rotation of the release lever at an engaging part with the paper pressing shaft, and when the release lever is rotated on both sides of the range restricting part, the paper is released. Since the introduction cam part that guides the presser shaft to the range restricting part is arranged, even if the paper presser shaft is erroneously inserted during assembly or maintenance of the printer, the release lever can be simply rotated to a predetermined position. The paper holding shaft can be easily set to the proper position by the insertion cam portion, which greatly improves the assembling property and makes it possible to provide an inexpensive printer.

As described above, the printer is always capable of ensuring clear print quality, smooth insertion and removal of recording paper, and improvement of printer assemblability and maintenance. Can be said to be very large.

[Brief description of drawings]

FIG. 1 is an overall perspective view of the structure of a printer that is an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a structure around a paper feeding mechanism, a paper guiding mechanism, and an auto cutter mechanism of a printer according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a structure around a paper feeding mechanism of the printer according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing a structure around a paper feeding mechanism of the printer of one embodiment of the present invention.

FIG. 5 is a perspective view showing the structure around the platen of the printer of one embodiment of the present invention.

FIG. 6 is a cross-sectional view around the platen of the printer according to the first exemplary embodiment of the present invention.

FIG. 7 is a side view showing a standby state of the R-side release lever of the printer according to the first embodiment of the present invention.

FIG. 8 is a side view of the printer according to the first embodiment of the present invention when the R-side release lever operates.

FIG. 9 is a side view of the printer according to the first embodiment of the present invention when the paper pressing shaft is erroneously inserted into the R-side release lever.

[Explanation of symbols]

 41 Paper Feed Frame 44 Paper Feed Shaft 46 Paper Hold Shaft 52 R Side Hold Roller 54 Receipt Feed Roller 119 R Side Release Lever

Claims (5)

[Claims] 1. A paper feed shaft on which a paper feed roller is arranged,
A paper pressing roller is attached and comprises a paper pressing shaft urged to urge the paper feeding roller, and a bearing portion of the paper feeding shaft, and the paper pressing roller urges the paper feeding roller. In a printer having a release mechanism equipped with a release lever for moving the paper pressing shaft so as to release, a paper feeding shaft in which a paper feeding roller is arranged and driven to rotate, and a paper pressing roller are rotatably provided so that the movement direction is A paper pressing shaft that is regulated and attached to the frame; an urging member that urges the paper pressing shaft so that the paper pressing roller presses the paper feeding roller; and a paper pressing shaft that engages with the paper pressing shaft. A release lever rotatably attached to the frame, the release lever having a cam portion for moving the presser shaft, wherein the release lever rotates in a direction opposite to the rotation direction of the paper feed shaft; Printer, characterized in that e roller biases into the paper feed roller is released. 2. The printer according to claim 1, wherein the release lever is provided with a restricting portion that restricts rotation of the release lever at an engaging portion with the paper pressing shaft. 3. The printer according to claim 2, wherein the regulating portion of the release lever is provided on an operating side where the paper pressing roller releases the bias of the paper feeding roller. 4. The printer according to claim 2, wherein the restricting portion of the release lever is provided on a standby side where the cam portion does not engage with the paper pressing shaft. 5. The release lever is provided with a range restriction part for restricting a range of rotation of the release lever at an engaging part with the paper pressing shaft, and the release lever is provided on both sides of the range restriction part. 2. The printer according to claim 1, further comprising an introduction cam portion arranged to guide the paper pressing shaft to the range regulating portion when the printer cam is rotated.