Cutter device for printer and printer

Abstract

The invention discloses a cutter device for a printer. The cutter device comprises a fixed cutter; a movable blade configured to gradually close or separate blades of the movable blade and the fixed blade 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 invention further provides a printer.

Description

Technical Field

[0001] The present invention relates to printer technology, in particular to a cutter device for a printer and a printer. Background Art

[0002] Patent application CN211362446U discloses a scissor-type cutter mechanism and a thermal printer for reducing paper accumulation. The cutter mechanism of the solution includes a fixed knife, a movable knife, and a compression spring. The compression spring can apply force to the movable knife so that the movable knife is close to the fixed knife. The disadvantage of the above solution is that along the length extension direction of the movable knife, the force of the compression spring on the movable knife automatically decays outward from the rotation center of the knife, which easily causes the contact force between the movable knife tail and the fixed knife tail to be weak, making it difficult to cut the printing medium (such as printing paper) at the knife tail position, especially for the movable knife and the fixed knife with a longer length. In view of this, this application is specially proposed. Summary of the invention

[0003] The technical problem to be solved by the present invention is to improve a printer to solve the problem that the force of the compression spring on the movable knife in the prior art gradually attenuates the rotation center of the automatic knife outward, which may cause the printing medium at the tail position of the knife to be difficult to cut off.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a cutter device for a printer, comprising: a fixed knife; a movable knife, which is configured to: gradually close or separate the blades of the movable knife and the fixed knife by rotating around a set axis; a driving mechanism, driving the movable knife to rotate around the set axis; a pressure member, which applies an elastic force to the movable knife so that the blades of the movable knife and the fixed knife are close to each other; the pressure member comprises: a compression spring portion, which is configured to apply a first elastic force to the movable knife to press against the fixed knife along the extension direction of the set axis; an elastic arm portion, which extends a set distance along the length direction of the movable knife from the pressure side of the compression spring portion that presses the movable knife, and applies a second elastic force to the movable knife to press against the fixed knife.

[0005] Preferably, the compression spring portion and the elastic arm portion are an integrally formed structure.

[0006] Preferably, the elastic arm has an anti-detachment fitting portion, and the movable knife is provided with an anti-detachment fitting portion that cooperates with the anti-detachment fitting portion to prevent the end of the elastic arm away from the pressure-applying side from detaching from the movable knife.

[0007] Preferably, the anti-slip portion is an embedding hole or an embedding groove, and the anti-slip mating portion is embedded in the embedding hole or the embedding groove.

[0008] Preferably, the driving mechanism includes a transmission gear for driving the movable knife to rotate around a set axis, the movable knife is provided with a driven portion transmission connected to the transmission gear, the compression spring portion and the transmission gear are located on the same side of the movable knife; the elastic arm portion is located on the side of the driven portion or the driving gear close to the set axis, and the position where the elastic arm portion applies the second elastic force to the movable knife is the end of the elastic arm portion away from the pressure-applying side.

[0009] Preferably, the elastic arm portion includes a first section and a second section connected to an end of the first section away from the compression spring portion, a preset angle is formed between the first section and the second section, and the second section contacts the movable knife and applies a second elastic force to the movable knife to press against the fixed knife.

[0010] Preferably, the ratio of the set distance to the extension length of the paper cutting arm of the movable knife 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 knife is arranged to rotate around a set axis by being sleeved on a pin shaft, and a limiter is installed on the pin shaft to limit the compression spring portion from detaching from the pin shaft along the extension direction of the set axis.

[0013] The present application further provides a printer, comprising the cutter device for a printer as described in any one of the above items.

[0014] Due to the adoption of the above technical solution, the present invention has the following beneficial effects: 1. Compared with the prior art, the technical solution of the present application, in addition to the pressure spring portion, is also provided with an elastic arm portion, which extends along the length direction of the movable knife. The elastic arm portion enables the movable knife to be closer to the fixed knife, thereby helping to improve the cutting effect of the printing medium and improving the problem that the printing medium at the tail position of the knife is not easy to cut; 2. The compression spring part and the transmission gear are located on the same side of the movable knife, making the movable knife more compact in thickness direction and reducing the space occupied by the cutting device in thickness direction; 3. The elastic arm is located on the side of the driven part or the transmission gear close to the set axis. This configuration makes full use of the space in the length direction of the movable knife, and does not increase the occupied space due to the setting of the elastic arm, which will cause the width of the movable knife to become wider or the height of the cutting device to become higher. The position where the elastic arm applies the second elastic force to the movable knife is the end of the elastic arm away from the pressure-applying side, so that the position where the elastic arm applies the second elastic force to the movable knife is closer to the tail end of the movable knife, and the tail paper cutting effect is more reliable. 4. Since the first section and the second section are arranged at a preset angle, the second section contacts the movable knife and applies the second elastic force to the movable knife so as to make it close to the fixed knife, so that the position where the elastic arm applies the second elastic force to the movable knife is the end of the elastic arm away from the pressure-applying side, thereby making the position where the elastic arm applies the second elastic force to the movable knife closer to the rear end of the movable knife. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0016] Figure 1 and Figure 2 Schematic diagrams of a printer according to an embodiment are respectively depicted at different viewing angles; Figure 3 A first exploded view of a printer according to an embodiment is shown; Figure 4 A second exploded view of a printer according to an embodiment is shown; Figure 5 A third exploded view of a printer according to an embodiment is shown; Figure 6 and Figure 7 A first exploded view of a movable knife mechanism of a printer according to an embodiment is respectively shown at different viewing angles; Figure 8 and Fig. 9 A second exploded view of the movable knife mechanism of the printer of an embodiment is respectively depicted at different viewing angles; Fig.10 A third exploded view of a movable knife mechanism of a printer according to an embodiment is shown; Fig.11 A schematic diagram of a pressure member and a movable knife of a printer according to an embodiment is shown.

[0017] Reference numerals: Frame 1, thermal head assembly 2, print roller assembly 3, paper guide component 4, print roller drive mechanism 5, fixed knife 6, movable knife mechanism 7, first frame 7A, second frame 7B, movable knife 7C, pressure component 7D, limiter 7E, movable knife drive motor 7F, transmission gear 7G. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of the present invention described and shown in the accompanying drawings can be arranged and designed in various configurations. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0020] Combination Figures 1 to 11 In one embodiment, the printer of the present application includes a frame 1, a thermal head assembly 2, a print roller assembly 3, a paper guide component 4, a print roller driving mechanism 5, a fixed knife 6, and a movable knife mechanism 7.

[0021] The following will be further described with reference to the drawings. For the convenience of description, the X direction in the drawings is from right to left, the Y direction is from back to front, and the Z direction is from bottom to top.

[0022] The frame 1 includes 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.

[0023] The left and right sides of the thermal head assembly 2 are swingably mounted on the main frame 1A of the frame 1, and combined with Figure 5 A force spring P is provided between the thermal head assembly 2 and the auxiliary frame body 1B to apply a force to the thermal head assembly 2 to press against the print roller assembly 3 .

[0024] The print roller assembly 3 is installed on the frame 1, and includes a print roller 3A. The print roller 3A cooperates with the thermal head assembly 2 to print. This is the prior art, so it will not be described in detail.

[0025] The paper guide member 4 is installed on the main frame 1A of the frame 1. The paper guide member 4 has a paper guide slot (not shown) for guiding printing media such as printing paper to move between the thermal head assembly 2 and the printing roller 3A. The paper guide slot extends in the left-right direction.

[0026] The print roller driving mechanism 5 is installed on the main frame 1A of the frame 1, and includes a print driving motor 5A and a transmission gear assembly 5B. The print driving motor 5A drives the print roller 3A to rotate through the transmission gear assembly 5B.

[0027] The fixed blade 6 is mounted on the printing roller assembly 3, and the fixed blade 6 extends in the left-right direction.

[0028] The moving knife mechanism 7 is mounted on the frame 1. Figure 6The movable knife mechanism 7 comprises a first frame 7A, a second frame 7B, a movable knife 7C, a pressure member 7D, a stopper 7E, a movable knife driving motor 7F, and a transmission gear 7G. The first frame 7A and the second frame 7B cooperate to form a movable knife frame. The movable knife driving motor 7F and the transmission gear 7G cooperate to form a driving mechanism for driving the movable knife 7C to rotate around a set axis L. The fixed knife 6 and the movable knife mechanism 7 constitute a cutter device for a printer. This will be further described below.

[0029] In this embodiment, the first frame 7A and the second frame 7B are spliced ​​in the front-to-back direction. The two can be connected by a snap-fit ​​structure or fastening screws, and an accommodating space is formed therebetween for installing other components.

[0030] Combination Figure 6 The movable knife frame formed by the first frame 7A and the second frame 7B is provided with a pin shaft T (located at the front side of the first frame 7A in this embodiment), and the movable knife 7C is set to rotate around the set axis L by being sleeved on the pin shaft T. The movable knife 7C rotates around the set axis L, so that the blades of the movable knife 7C and the fixed knife 6 are gradually closed or separated. Figure 6 The movable knife 7C has a pivoting portion M1, an anti-slipping portion M2, and a driven portion M3. The movable knife 7C is sleeved on the pin T through the pivoting portion M1. The anti-slipping portion M2 is used in conjunction with the pressure member 7D, which will be further described later. In this embodiment, the driven portion M3 is a long strip hole, which is used in conjunction with a driving mechanism that drives the movable knife 7C to move, which will be further described later.

[0031] The pressure member 7D can apply an elastic force to the movable knife 7C to make the blades of the movable knife 7C and the fixed knife 6 close to each other. Specifically, in this embodiment, the pressure member 7D includes a compression spring portion 7D-1 and an elastic arm portion 7D-2, and the compression spring portion 7D-1 and the elastic arm portion 7D-2 are an integrally formed structure (they can also be adjusted to a non-integrated structure). Fig.11 The compression spring portion 7D-1 is configured to exert a first elastic force on the movable knife 7C to close to the fixed knife 6 along the extension direction of the setting axis L. The compression spring portion 7D-1 has a pressure side N1 and a back side N2, which are located on both sides along the extension direction of the setting axis L. The compression spring portion 7D-1 applies pressure to the movable knife 7C through the pressure side N1. Fig.11, the elastic arm portion 7D-2 extends from the pressure side N1 along the length direction of the movable knife 7C by a set distance W1, and applies a second elastic force to the movable knife 7C to press against the fixed knife 6. It should be understood that the elastic arm portion 7D-2 extends along the length direction of the movable knife 7C by a set distance W1, which includes two situations. One is that the extension direction of the elastic arm portion 7D-2 coincides with the length direction of the movable knife 7C, and the other is that the extension direction of the elastic arm portion 7D-2 deviates from the length direction of the movable knife 7C by a certain angle (in this case, the projection distance of the elastic arm portion 7D-2 in the length direction of the movable knife 7C is the set distance W1). The portion of the movable knife 7C located between the set axis L and the tail end is the paper cutting arm, such as Fig.11 As shown, the extension length of the paper cutting arm is W, and the ratio of the set distance W1 to the extension length W of the paper cutting arm of the movable knife 7C can be between 1:5 and 1:1.5, such as the ratio of the set distance W1 to the extension length W of the paper cutting arm of the movable knife 7C is between 1:2.5 and 1:3.5, for example, 1:3.2. Fig.11 In this embodiment, the elastic arm portion 7D-2 includes a first section K1 and a second section K2 connected to an end of the first section K1 away from the compression spring portion 7D-1. A preset angle a is formed between the first section K1 and the second section K2. The angle a is less than 180 degrees, and the preferred range is between 120 degrees and 175 degrees, for example, 165 degrees. The first section K1 is slightly inclined relative to the blade surface of the movable knife 7C, and the second section K2 extends obliquely toward the movable knife 7C in a direction away from the compression spring portion 7D-1. The second section K2 contacts the movable knife 7C and applies a second elastic force to the movable knife 7C to close to the fixed knife 6. In the present embodiment, since the first section K1 and the second section K2 are arranged at a preset angle a, the second section K2 contacts the movable knife 7C and applies the second elastic force to the movable knife 7C to press against the fixed knife 6, so that the position where the elastic arm portion 7D-2 applies the second elastic force to the movable knife is the end of the elastic arm portion 7D-2 away from the pressure-applying side, thereby making the position where the elastic arm portion 7D-2 applies the second elastic force to the movable knife closer to the rear end of the movable knife.

[0032] The end of the elastic arm portion 7D-2 away from the pressure side N1 has an anti-slipping fitting portion K21, and the anti-slipping portion M2 is used to cooperate with the anti-slipping fitting portion K21 to prevent the end of the elastic arm portion 7D-2 away from the pressure side N1 from being separated from the movable knife 7C. Specifically, the end of the second section K2 of this embodiment away from the pressure side N1 has the aforementioned anti-slipping fitting portion K21, and the anti-slipping portion M2 is an embedding hole, and the anti-slipping fitting portion K21 is embedded in the embedding hole along a direction substantially perpendicular to the blade surface of the movable knife 7C. The anti-slipping fitting portion K21 cooperates with the anti-slipping portion M2 to prevent the end of the elastic arm portion 7D-2 away from the pressure side N1 from being separated from the movable knife 7C during the rotation of the movable knife 7C, so that the elastic arm portion 7D-2 rotates with the movable knife 7C to reliably apply force to the movable knife 7C.

[0033] The limiting member 7E is mounted on the pin shaft T, and the limiting member 7E is used to limit the compression spring portion 7D-1 of the pressure member 7D from being separated from the pin shaft T along the extension direction of the set axis L. In this embodiment, the limiting member 7E is a T-shaped limiting sleeve, the compression spring portion 7D-1 is sleeved outside the T-shaped limiting sleeve, and the two ends of the compression spring portion 7D-1 are respectively in contact with the movable knife 7C and the end of the T-shaped limiting sleeve.

[0034] The movable knife driving motor 7F is installed on the movable knife frame, and its driving shaft is meshed with the transmission gear 7G, thereby driving the transmission gear 7G to rotate forward or reverse. The transmission gear 7G is used to drive the movable knife 7C to rotate around the set axis L. The driven part M3 of the movable knife 7C is connected to the transmission gear 7G. Figure 7 In this embodiment, the transmission gear 7G is provided with an eccentric sliding portion G1, and the eccentric sliding portion G1 and the rotation center of the transmission gear 7G have a preset eccentricity. The eccentric sliding portion G1 is slidably matched with the driven portion M3 of the movable knife 7C, and is slidably matched with the arc-shaped sliding groove G2 provided on the first frame 7A (refer to Figure 6 , Fig. 9 ), when the transmission gear 7G rotates, the movable knife 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 knife 7C. The rotation range of the movable knife 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 knife 7C (combined with Figure 3 or Figure 8 , both located on the front side of the movable knife 7C), so that the movable knife 7C is arranged more compactly in the thickness direction, reducing the occupied space in the thickness direction. The elastic arm portion 7D-2 is located on the side of the driven portion M3 or the transmission gear 7G close to the set axis L. This configuration makes full use of the space in the length direction of the movable knife 7C, and does not increase the occupied space due to the setting of the elastic arm portion 7D-2, which will cause the width of the movable knife 7C to become wider or the height of the cutting device to become higher. The position where the elastic arm portion 7D-2 applies the second elastic force to the movable knife 7C is the end of the elastic arm portion 7D-2 away from the pressure side N1, so that the position where the elastic arm portion 7D-2 applies the second elastic force to the movable knife 7C is closer to the tail end of the movable knife 7C, and the tail paper cutting effect is more reliable.

[0035] The above is a specific description of the printer of one embodiment of the present application. It should be understood that the present application can also have other modified implementations. Unlike the previous embodiment in which the movable knife 7C is installed on the movable knife frame and the fixed knife 6 is installed on the print roller assembly 3, in another embodiment, the movable knife 7C and the fixed knife 6 can be installed on the same frame. In another embodiment, the anti-slip portion M2 can be adjusted to an embedded groove (i.e., it does not penetrate the movable knife 7C), or the anti-slip portion M2 can also be adjusted to a clamping wall located on both sides of the elastic arm portion 7D-2 along the length direction of the elastic arm portion 7D-2, and the two clamping arms are clamped on both sides of the anti-slip mating portion of the elastic arm portion 7D-2 to prevent the anti-slip mating portion from detaching from the movable knife 7C.

[0036] According to the technical solution of the present application, the pressure-applying component 7D includes, in addition to the compression spring portion 7D-1, an elastic arm portion 7D-2. The elastic arm portion 7D-2 extends along the length direction of the movable knife 7C. The elastic arm portion 7D-2 enables the movable knife 7C to be closer to the fixed knife 6, thereby helping to improve the cutting effect of the printing medium and improving the problem that the printing medium at the tail position of the knife is not easy to cut.

[0037] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A cutter device for a printer, comprising: Fixed knife (6); The movable knife (7C) is configured to gradually close or separate the blades of the movable knife (7C) and the fixed knife (6) by rotating around a set axis (L); A driving mechanism drives the movable knife (7C) to rotate around the set axis (L); A pressure member (7D) which applies an elastic force to the movable knife (7C) so that the blades of the movable knife (7C) and the fixed knife (6) are closely attached to each other; It is characterized in that The pressure applying member (7D) comprises: A compression spring portion (7D-1) is arranged to exert a first elastic force on the movable knife (7C) to closely contact the fixed knife (6) along the extension direction of the setting axis (L); The elastic arm portion (7D-2) extends a set distance (W1) along the length direction of the movable knife (7C) from the pressure side (N1) of the compression spring portion (7D-1) for applying pressure to the movable knife (7C), and applies a second elastic force to the movable knife (7C) to keep it in close contact with the fixed knife (6).

2. The printer cutter device according to claim 1, characterized in that: The compression spring portion (7D-1) and the elastic arm portion (7D-2) are an integrally formed structure.

3. The printer cutter device according to claim 1, characterized in that: The elastic arm portion (7D-2) has an anti-detachment fitting portion (K21), and the movable knife (7C) is provided with an anti-detachment fitting portion (M2) that cooperates with the anti-detachment fitting portion (K21) to prevent the end of the elastic arm portion (7D-2) away from the pressure side (N1) from detaching from the movable knife (7C).

4. The printer cutter device according to claim 3, characterized in that: The anti-slip portion (M2) is an embedding hole or an embedding groove, and the anti-slip matching portion (K21) is embedded in the embedding hole or the embedding groove.

5. The printer cutter device according to claim 1, characterized in that: The driving mechanism comprises a transmission gear (7G) for driving the movable knife (7C) to rotate around a set axis (L); the movable knife (7C) is provided with a driven part (M3) in transmission connection with the transmission gear (7G); the compression spring part (7D-1) and the transmission gear (7G) are located on the same side of the movable knife (7C); the elastic arm part (7D-2) is located on a side of the driven part (M3) or the transmission gear (7G) close to the set axis (L); the position where the elastic arm part (7D-2) applies a second elastic force to the movable knife (7C) is close to an end of the elastic arm part (7D-2) away from the pressure-applying side (N1).

6. The printer cutter device according to any one of claims 1 to 5, characterized in that: The elastic arm portion (7D-2) comprises a first section (K1) and a second section (K2) connected to an end of the first section (K1) away from the compression spring portion (7D-1); a preset angle (a) is formed between the first section (K1) and the second section (K2); the second section (K2) contacts the movable knife (7C) and applies a second elastic force to the movable knife (7C) to press against the fixed knife (6).

7. The printer cutter device according to claim 1, characterized in that: The ratio of the set distance (W1) to the extension length (W) of the paper cutting arm of the movable knife (7C) is between 1:5 and 1:1.

5.

8. The printer cutter device according to claim 7, characterized in that: The ratio is between 1:2.5 and 1:3.

5.

9. The printer cutter device according to claim 1, characterized in that: The movable knife (7C) is arranged to rotate around a set axis (L) by being sleeved on a pin shaft (T), and a limiting member (7E) is installed on the pin shaft (T) to limit the compression spring portion (7D-1) from detaching from the pin shaft (T) along the extension direction of the set axis (L).

10. A printer, characterized in that: A printer cutter device comprising the cutter device according to any one of claims 1 to 9.

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