Movable cutter mechanism for printer and printer

Abstract

The utility model discloses a moving cutter mechanism for a printer, which is suitable for being matched with a fixed cutter to cut a printing medium, and comprises a movable cutter which is arranged to enable the cutting edges of the movable cutter and the fixed cutter to be gradually closed or separated in a manner of rotating around a set axis; the driving mechanism drives the movable cutter to rotate around the set axis; a pressing member that applies, to the movable blade, an elastic biasing force that causes the blades of the movable blade and the fixed blade to adhere to each other; the pressing member includes: a pressure spring portion configured to apply a first elastic acting force to the movable blade in an extension direction of the set axis, the first elastic acting force being close to the fixed blade; and an elastic arm part which extends a set distance in the length direction of the movable blade from the pressing side where the movable blade is pressed by the pressure spring part, and applies a second elastic pressing force to the movable blade, the second elastic pressing force being close to the fixed blade. According to the technical scheme, the cutting effect of the printing medium can be improved. The utility model further provides a printer.

Description

TECHNICAL FIELD

[0001] The utility model relates to a printer technology, specifically, relate to a kind of movable cutter mechanism and printer for printer. BACKGROUND

[0002] Patent application CN211362446U discloses a kind of paper accumulation reducing shear cutter mechanism and thermal printer, the cutter mechanism of scheme includes fixed cutter, movable cutter, compression spring, compression spring can force movable cutter, make movable cutter close to fixed cutter. The deficiency of the foregoing scheme is that, along the length extension direction of movable cutter, the force of compression spring to movable cutter gradually attenuates towards the outside of the rotation center of automatic knife, it is easy to cause the close force of movable cutter tail and fixed cutter tail to be weak, cause the printing medium (such as printing paper) of knife tail position not easy to cut off, especially for long movable cutter, fixed cutter. In view of this, the present application is proposed. UTILITARY MODEL

[0003] The technical problem to be solved by the utility model is to improve a kind of printer to solve the problem that the force of compression spring to movable cutter gradually attenuates towards the outside of the rotation center of automatic knife in prior art, possibly cause the printing medium of knife tail position not easy to cut off.

[0004] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: a kind of movable cutter mechanism for printer, it is suitable to cooperate fixed cutter and cut printing medium;It includes: fixed cutter;Movable cutter, it is set to: in the way of rotating around setting axis, make the blade of movable cutter and fixed cutter gradually close or separate;Driving mechanism, drive the movable cutter rotates around the setting axis;Pressure member, it is to movable cutter with the blade of movable cutter and fixed cutter is mutually close to the elastic force of spring;The pressure member includes: compression spring part, it is set to along the extension direction of setting axis to movable cutter with the first elastic force of spring close to fixed cutter;Elastic arm part, from the pressure side of the compression spring part to movable cutter, along the length direction of movable cutter extends setting distance, and to movable cutter with the second elastic force of spring close to fixed cutter.

[0005] Preferably, the compression spring part and the elastic arm part are integrally formed.

[0006] Preferably, the elastic arm part has a anti-disengagement fitting part, and the movable cutter is provided with an anti-disengagement part that cooperates with the anti-disengagement fitting part to prevent the end of the elastic arm part away from the pressure side from disengaging from the movable cutter.

[0007] Preferably, the anti-disengagement part is a mortise hole or a mortise groove, and the anti-disengagement fitting part is embedded in the mortise hole or the mortise groove.

[0008] Preferably, the driving mechanism comprises a transmission gear for driving the movable cutter to rotate around the setting axis, the movable cutter is provided with a driven part in transmission connection with the transmission gear, the compression spring part and the transmission gear are located on the same side of the movable cutter, the elastic arm part is located on the side of the driven part or the driving gear close to the setting axis, and the position where the elastic arm part applies the second elastic force to the movable cutter is the end of the elastic arm part away from the compression spring part.

[0009] Preferably, the elastic arm part comprises a first segment and a second segment connected to the end of the first segment away from the compression spring part, the first segment and the second segment form a preset included angle, and the second segment contacts the movable cutter and applies the second elastic force to the movable cutter to make the movable cutter tightly contact the fixed cutter.

[0010] Preferably, the ratio of the setting distance to the extension length of the paper cutting arm of the movable cutter is between 1:5 and 1:1.5.

[0011] Preferably, the ratio is between 1:2.5 and 1:3.5.

[0012] Preferably, the movable cutter is arranged to rotate around the setting axis by being sleeved on a pin shaft, and the pin shaft is provided with a limiting piece for limiting the compression spring part from being separated from the pin shaft in the extension direction of the setting axis.

[0013] Preferably, the movable cutter and the driving mechanism are mounted on a movable cutter frame.

[0014] The application further provides a printer comprising a movable cutter mechanism and a fixed cutter, wherein the movable cutter mechanism is any one of the above-mentioned printer movable cutter mechanisms, and the rotation range of the movable cutter around the setting axis is between 10 degrees and 50 degrees.

[0015] Thanks to the above technical scheme, the utility model has the following beneficial effects:

[0016] 1. Compared with the prior art, the technical scheme of the application further comprises an elastic arm part in addition to the compression spring part, the elastic arm part extends along the length direction of the movable cutter, and the elastic arm part makes the movable cutter more tightly contact the fixed cutter, thereby helping to improve the cutting effect of the printing medium and solve the problem that the printing medium at the cutter tail position is not easily cut off.

[0017] 2. The compression spring part and the transmission gear are located on the same side of the movable cutter, so that the arrangement in the thickness direction of the movable cutter is more compact, and the occupied space in the thickness direction of the movable cutter mechanism is reduced.

[0018] 3. The elastic arm is located on the side of the driven part or transmission gear close to the set axis. This configuration makes full use of the space in the length direction of the movable blade. The installation of the elastic arm will not increase the width of the movable blade or the height of the cutting device, thus avoiding the increase in space occupied. Moreover, the position where the elastic arm applies the second elastic force to the movable blade is at the end of the elastic arm away from the pressure side, so that the position where the elastic arm applies the second elastic force to the movable blade is closer to the tail end of the movable blade, and the tail cutting effect is more reliable.

[0019] 4. Since the first segment and the second segment are set at a preset angle, the second segment contacts the movable blade and applies a second elastic force to the movable blade to fix it. This makes the position of the elastic arm applying the second elastic force to the movable blade the end of the elastic arm away from the pressure side, so that the position of the elastic arm applying the second elastic force to the movable blade is closer to the tail end of the movable blade. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only involve some embodiments of this utility model, and are not intended to limit this utility model.

[0021] Figure 1 and Figure 2 Schematic diagrams of a printer according to one embodiment are shown from different perspectives;

[0022] Figure 3 A first exploded view of a printer according to one embodiment is shown;

[0023] Figure 4 A second exploded view of a printer according to one embodiment is shown;

[0024] Figure 5 A third exploded view of a printer according to one embodiment is shown;

[0025] Figure 6 and Figure 7 The first exploded view of the moving blade mechanism of a printer according to an embodiment is shown from different perspectives;

[0026] Figure 8 and Figure 9 The second exploded view shows the moving blade mechanism of a printer according to one embodiment from different perspectives;

[0027] Figure 10 A third exploded view of the moving blade mechanism of a printer according to one embodiment is shown;

[0028] Figure 11 A schematic diagram of a pressure-applying member and a movable blade of a printer according to one embodiment is shown.

[0029] Reference signs:

[0030] Rack 1, thermal head assembly 2, print roller assembly 3, paper guide member 4, print roller driving mechanism 5, fixed knife 6, movable knife mechanism 7, first frame 7A, second frame 7B, movable knife 7C, pressing member 7D, stopper 7E, movable knife driving motor 7F, transmission gear 7G. DETAILED DESCRIPTION

[0031] To make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the present application will be further described in detail below with reference to the drawings. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0032] Some embodiments of the present application will be described in detail below with reference to the drawings. The features in the following embodiments can be combined with each other without conflict.

[0033] In combination with Figures 1 to 11 In an embodiment, the printer of the present application comprises a rack 1, a thermal head assembly 2, a print roller assembly 3, a paper guide member 4, a print roller driving mechanism 5, a fixed knife 6, and a movable knife mechanism 7.

[0034] The following will be further described in combination with the drawings. For the convenience of description, the X direction in the drawings is the direction from right to left, the Y direction is the direction from back to front, and the Z direction is the direction from bottom to top.

[0035] The rack 1 comprises a main frame body 1A and an auxiliary frame body 1B, and the auxiliary frame body 1B is installed on the main frame body 1A.

[0036] The left and right sides of the thermal head assembly 2 are swingably installed on the main frame body 1A of the rack 1, and in combination Figure 5 A pressing spring P is arranged between the thermal head assembly 2 and the auxiliary frame body 1B, so as to apply an action force of close contact with the print roller assembly 3 to the thermal head assembly 2.

[0037] The print roller assembly 3 is installed on the rack 1, and comprises a print roller 3A cooperating with the thermal head assembly 2 for printing. The print roller assembly 3 is a prior art, and thus will not be described again.

[0038] The paper guide member 4 is installed on the main frame body 1A of the rack 1, and has a paper guide slit (not shown in the drawings) on the paper guide member 4 for guiding the print medium such as printing paper to move between the thermal head assembly 2 and the print roller 3A. The paper guide slit extends along the left-right direction.

[0039] The printing roller driving mechanism 5 is installed on the main frame body 1A of the frame 1, and includes a printing driving motor 5A and a transmission gear assembly 5B. The printing driving motor 5A drives the printing roller 3A to rotate through the transmission gear assembly 5B.

[0040] The fixed cutter 6 is installed on the printing roller assembly 3, and extends along the left-right direction.

[0041] The movable cutter mechanism 7 is installed on the frame 1. In combination Figure 6 , the movable cutter mechanism 7 includes a first frame 7A, a second frame 7B, a movable cutter 7C, a pressing member 7D, a limiting member 7E, a movable cutter driving motor 7F, and a transmission gear 7G. The first frame 7A and the second frame 7B cooperatively form a movable cutter frame. The movable cutter driving motor 7F and the transmission gear 7G cooperatively form a driving mechanism for driving the movable cutter 7C to rotate around a set axis L. The fixed cutter 6 and the movable cutter mechanism 7 form a cutter device for a printer. Details will be described below.

[0042] In this embodiment, the first frame 7A and the second frame 7B are spliced in the front-rear direction, and are connected by a clamping structure or fastening screws. A receiving space is formed therebetween for installing other components.

[0043] In combination Figure 6 , the movable cutter frame formed by the first frame 7A and the second frame 7B is provided with a pin shaft T (in this embodiment, located on the front side of the first frame 7A). The movable cutter 7C is arranged to rotate around the set axis L by being sleeved on the pin shaft T. The movable cutter 7C is arranged to rotate around the set axis L, so that the cutting edges of the movable cutter 7C and the fixed cutter 6 gradually close or separate. Figure 6 In combination Figure 6 , the movable cutter 7C has a pivoting portion M1, an anti-disengagement portion M2, and a driven portion M3. The movable cutter 7C is sleeved on the pin shaft T through the pivoting portion M1. The anti-disengagement portion M2 is used in cooperation with the pressing member 7D, which will be described below. In this embodiment, the driven portion M3 is an elongated hole, which is used in cooperation with the driving mechanism for driving the movable cutter 7C to move, which will be described below.

[0044] The pressing member 7D can apply an elastic force to the movable cutter 7C to make the cutting edges of the movable cutter 7C and the fixed cutter 6 tightly contact each other. Specifically, in this embodiment, the pressing member 7D includes a compression spring portion 7D-1 and an elastic arm portion 7D-2, which are integrally formed (or can be adjusted to be non-integrally formed). In combination Figure 11 , the compression spring portion 7D-1 is arranged to apply a first elastic force to the movable cutter 7C to tightly contact the fixed cutter 6 along the extension direction of the set axis L. The compression spring portion 7D-1 has a pressing side N1 and a back side N2 located on both sides along the extension direction of the set axis L, and the compression spring portion 7D-1 applies pressure to the movable cutter 7C through the pressing side N1. Figure 11, the elastic arm portion 7D-2 extends along the length direction of the movable cutter 7C by a distance W1 from the pressing side N1 and applies the second elastic force to the movable cutter 7C to press the movable cutter 7C against the fixed cutter 6. It should be understood that the elastic arm portion 7D-2 extends along the length direction of the movable cutter 7C by the distance W1, including two cases, one is that the extension direction of the elastic arm portion 7D-2 coincides with the length direction of the movable cutter 7C, and the other is that the extension direction of the elastic arm portion 7D-2 deviates from the length direction of the movable cutter 7C by a certain angle (at this time, the projection distance of the elastic arm portion 7D-2 in the length direction of the movable cutter 7C is the distance W1). The portion of the movable cutter 7C between the set axis L and the tail end is a cutting arm, as shown in Figure 11 , the extension length of the cutting arm is W, and the ratio of the distance W1 to the extension length W of the cutting arm of the movable cutter 7C can be between 1:5 and 1:1.5, such as between 1:2.5 and 1:3.5, for example, 1:3.2. In combination Figure 11 , in the embodiment, the elastic arm portion 7D-2 includes a first segment K1 and a second segment K2 connected to one end of the first segment K1 away from the compression spring portion 7D-1, and a preset included angle a is formed between the first segment K1 and the second segment K2. The included angle a is less than 180 degrees, and the preferred range can be between 120 degrees and 175 degrees, for example, 165 degrees. The first segment K1 is slightly inclined relative to the blade surface of the movable cutter 7C, and the second segment K2 extends in the direction away from the compression spring portion 7D-1 and is inclined towards the movable cutter 7C. The second segment K2 contacts the movable cutter 7C and applies the second elastic force to the movable cutter 7C to press the movable cutter 7C against the fixed cutter 6. In the embodiment, due to the preset included angle a between the first segment K1 and the second segment K2, the second segment K2 contacts the movable cutter 7C and applies the second elastic force to the movable cutter 7C to press the movable cutter 7C against the fixed cutter 6, so that the position of the elastic arm portion 7D-2 for applying the second elastic force to the movable cutter is the end of the elastic arm portion 7D-2 away from the pressing side, thereby making the position of the elastic arm portion 7D-2 for applying the second elastic force to the movable cutter closer to the tail end of the movable cutter.

[0045] The end of the elastic arm portion 7D-2 away from the pressing side N1 has an anti-disengagement portion K21, and the anti-disengagement portion M2 is used to cooperate with the anti-disengagement portion K21 to prevent the end of the elastic arm portion 7D-2 away from the pressing side N1 from disengaging from the movable cutter 7C. Specifically, the end of the second segment K2 away from the pressing side N1 has the aforementioned anti-disengagement portion K21, and the anti-disengagement portion M2 is a fitting hole. The anti-disengagement portion K21 is fitted into the fitting hole in a direction substantially perpendicular to the blade surface of the movable cutter 7C. The anti-disengagement portion K21 cooperates with the anti-disengagement portion M2 to prevent the end of the elastic arm portion 7D-2 away from the pressing side N1 from disengaging from the movable cutter 7C during the rotation of the movable cutter 7C, so that the elastic arm portion 7D-2 rotates with the movable cutter 7C to reliably apply force to the movable cutter 7C.

[0046] The limiting piece 7E is installed on the pin shaft T, and the limiting piece 7E is used to limit the extension direction of the compression spring part 7D-1 of the pressing member 7D along the set axis L from the pin shaft T. In this embodiment, the limiting piece 7E is a T-shaped limiting sleeve, the compression spring part 7D-1 is sleeved outside the T-shaped limiting sleeve, and the two ends of the compression spring part 7D-1 are respectively in abutment with the movable cutter 7C and the end of the T-shaped limiting sleeve.

[0047] The movable cutter driving motor 7F is installed on the movable cutter frame, the driving shaft of the movable cutter driving motor 7F is engaged with the transmission gear 7G, so as to drive the transmission gear 7G to rotate forward or reverse, the transmission gear 7G is used to drive the movable cutter 7C to rotate around the set axis L, and the driven part M3 of the movable cutter 7C is in transmission connection with the transmission gear 7G. Specifically, in combination with Figure 7 , in this embodiment, the transmission gear 7G is provided with an eccentric sliding part G1, the eccentric sliding part G1 has a preset eccentric distance from the rotation center of the transmission gear 7G, the eccentric sliding part G1 is in sliding fit with the driven part M3 of the movable cutter 7C, and is in sliding fit with the arc-shaped sliding groove G2 opened on the first frame 7A (for reference Figure 6 、 Figure 9 ), when the transmission gear 7G rotates, the movable cutter 7C is driven to rotate around the set axis L through the cooperation of the eccentric sliding part G1 and the driven part M3 of the movable cutter 7C. The rotation amplitude of the movable cutter 7C around the set axis L can be between 5 degrees and 90 degrees, preferably between 10 degrees and 50 degrees, for example, 24 degrees or 30 degrees. In this embodiment, the compression spring part 7D-1 and the transmission gear 7G are located on the same side of the movable cutter 7C (in combination with Figure 3 or Figure 8 , both are located on the front side of the movable cutter 7C), so that the arrangement in the thickness direction of the movable cutter 7C is more compact, and the occupied space in the thickness direction is reduced. The elastic arm part 7D-2 is located on the side close to the set axis L of the driven part M3 or the transmission gear 7G. This kind of configuration makes full use of the space in the length direction of the movable cutter 7C, and does not cause the width of the movable cutter 7C to be widened or the height of the cutter device to be increased to increase the occupied space due to the setting of the elastic arm part 7D-2, and the position where the elastic arm part 7D-2 exerts the second elastic force on the movable cutter 7C is the end of the elastic arm part 7D-2 away from the pressing side N1, so that the position where the elastic arm part 7D-2 exerts the second elastic force on the movable cutter 7C is closer to the tail end of the movable cutter 7C, and the tail paper cutting effect is more reliable.

[0048] The above is the specific description of the printer according to an embodiment of the present application. It should be understood that the present application can also be implemented in other variations. Unlike the previous embodiment in which the movable cutter 7C is mounted on the cutter frame and the fixed cutter 6 is mounted on the printing roller assembly 3, in another embodiment, the movable cutter 7C and the fixed cutter 6 can be mounted on the same frame. In another embodiment, the anti-disengagement portion M2 can be adjusted to be a mortise slot (i.e. not penetrating the movable cutter 7C), or the anti-disengagement portion M2 can also be adjusted to be clamping walls located on both sides of the elastic arm portion 7D-2 along the length direction of the elastic arm portion 7D-2, the two clamping arms clamping on both sides of the anti-disengagement portion of the elastic arm portion 7D-2 to prevent the anti-disengagement portion from disengaging from the movable cutter 7C.

[0049] The technical solution of the present application, in addition to the pressure spring portion 7D-1, the pressure member 7D is also provided with an elastic arm portion 7D-2, the elastic arm portion 7D-2 extends along the length direction of the movable cutter 7C, the elastic arm portion 7D-2 enables the movable cutter 7C to be more closely attached to the fixed cutter 6, thereby helping to improve the cutting effect of the printing medium and improving the problem that the printing medium at the tail position is not easy to cut off.

[0050] The above is the specific description of the printer according to an embodiment of the present application. It should be understood that the present application can also be implemented in other variations. Unlike the previous embodiment in which the movable cutter 7C is mounted on the cutter frame and the fixed cutter 6 is mounted on the printing roller assembly 3, in another embodiment, the movable cutter 7C and the fixed cutter 6 can be mounted on the same frame. In another embodiment, the anti-disengagement portion M2 can be adjusted to be a mortise slot (i.e. not penetrating the movable cutter 7C), or the anti-disengagement portion M2 can also be adjusted to be clamping walls located on both sides of the elastic arm portion 7D-2 along the length direction of the elastic arm portion 7D-2, the two clamping arms clamping on both sides of the anti-disengagement portion of the elastic arm portion 7D-2 to prevent the anti-disengagement portion from disengaging from the movable cutter 7C.

[0049] The technical solution of the present application, in addition to the pressure spring portion 7D-1, the pressure member 7D is also provided with an elastic arm portion 7D-2, the elastic arm portion 7D-2 extends along the length direction of the movable cutter 7C, the elastic arm portion 7D-2 enables the movable cutter 7C to be more closely attached to the fixed cutter 6, thereby helping to improve the cutting effect of the printing medium and improving the problem that the printing medium at the tail position is not easy to cut off.

[0050] The above is the specific description of the printer according to an embodiment of the present application. It should be understood that the present application can also be implemented in other variations. Unlike the previous embodiment in which the movable cutter 7C is mounted on the cutter frame and the fixed cutter 6 is mounted on the printing roller assembly 3, in another embodiment, the movable cutter 7C and the fixed cutter 6 can be mounted on the same frame. In another embodiment, the anti-disengagement portion M2 can be adjusted to be a mortise slot (i.e. not penetrating the movable cutter 7C), or the anti-disengagement portion M

Claims

1. A movable knife mechanism for a printer, which is adapted to cooperate with a fixed knife (6) to cut a print medium, the movable knife mechanism comprising: a movable knife (7C) arranged to gradually close or separate the cutting edges of the movable knife (7C) and the fixed knife (6) in a manner of rotation around a predetermined axis (L); a driving mechanism for driving the movable knife (7C) to rotate around the predetermined axis (L); a pressing member (7D) for applying an elastic force to the movable knife (7C) to make the cutting edges of the movable knife (7C) and the fixed knife (6) close to each other; the pressing member (7D) comprising: a compression spring portion (7D-1) arranged to apply a first elastic force to the movable knife (7C) to make the movable knife (7C) close to the fixed knife (6) in the direction of extension of the predetermined axis (L); and an elastic arm portion (7D-2) extending from a pressing side (N1) of the compression spring portion (7D-1) to the movable knife (7C) by a predetermined distance (W1) in the length direction of the movable knife (7C) and applying a second elastic force to the movable knife (7C) to make the movable knife (7C) close to the fixed knife (6); the compression spring portion (7D-1) and the elastic arm portion (7D-2) are integrally formed; the elastic arm portion (7D-2) has an anti-disengagement portion (K21), and the movable knife (7C) is provided with an anti-disengagement portion (M2) for cooperating with the anti-disengagement portion (K21) to prevent the elastic arm portion (7D-2) from disengaging from the movable knife (7C) at one end away from the pressing side (N1); the anti-disengagement portion (M2) is a fitting hole or a fitting groove, and the anti-disengagement portion (K21) is fitted in the fitting hole or the fitting groove; the driving mechanism comprises a transmission gear (7G) for driving the movable knife (7C) to rotate around the predetermined axis (L), the movable knife (7C) is provided with a driven portion (M3) in transmission connection with the transmission gear (7G), the compression spring portion (7D-1) and the transmission gear (7G) are located on the same side of the movable knife (7C), the elastic arm portion (7D-2) is located on the side of the driven portion (M3) or the transmission gear (7G) close to the predetermined axis (L), and the position of the elastic arm portion (7D-2) for applying the second elastic force to the movable knife (7C) is close to one end of the elastic arm portion (7D-2) away from the pressing side (N1); the elastic arm portion (7D-2) comprises a first segment (K1) and a second segment (K2) connected to one end of the first segment (K1) away from the compression spring portion (7D-1), a predetermined included angle (a) is formed between the first segment (K1) and the second segment (K2), the second segment (K2) is in contact with the movable knife (7C) and applies the second elastic force to the movable knife (7C) to make the movable knife (7C) close to the fixed knife (6); and the ratio of the predetermined distance (W1) to the extension length (W) of a cutting arm of the movable knife (7C) is between 1:5 and 1:1.

5. ​ ​ ​ characterized in that ​ ​ ​ 2. The knife mechanism for a printer according to claim 1, characterized by ​ 3. The knife mechanism for a printer according to claim 1, wherein ​ 4. The knife mechanism for a printer according to claim 3, wherein ​ 5. The knife mechanism for a printer according to claim 1, wherein ​ 6. The movable knife mechanism for a printer according to any one of claims 1 to 5, characterized by ​ 7. The moving knife mechanism for a printer according to claim 1, wherein ​ 8. The knife mechanism for a printer according to claim 1, wherein The movable blade (7C) is arranged to rotate around a set axis (L) by being fitted on a pin shaft (T) on which a limiting member (7E) is installed to limit the extension of the compression spring portion (7D-1) from the pin shaft (T) along the extension direction of the set axis (L).

9. The knife mechanism for a printer according to claim 1, wherein The movable blade (7C) and the driving mechanism are installed on a movable blade frame.

10. A printer comprising a moving knife mechanism, a fixed knife; characterized in that, The movable blade (7C) is arranged to rotate around a set axis (L) by being fitted on a pin shaft (T) on which a limiting member (7E) is installed to limit the extension of the compression spring portion (7D-1) from the pin shaft (T) along the extension direction of the set axis (L).

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