Transmission mechanism for cutting single pieces

Abstract

The utility model relates to a transmission mechanism for cutting sheets, which belongs to the technical field of digital printing machines and comprises a crank connecting rod portion, a guide portion and a balance portion used for balancing stress at two ends of a cutting knife, and two ends of the guide portion respectively and rotatably penetrate through two side walls of a paper cutting machine body to be connected with the crank connecting rod portion and the balance portion. The crank connecting rod part drives the cutting knife to move up and down along the paper cutting machine body to cut paper, the crank connecting rod part drives the balance part to move synchronously through the guide part, stress at the two ends of the cutting knife is balanced, and the balance part is driven to move synchronously when the crank connecting rod part moves. And at the moment, the crank connecting rod part and the balance part drive the two ends of the cutting knife to synchronously move, so that the stress at the two ends of the cutting knife is balanced when the cutting knife moves up and down to cut paper, and the problem that in the prior art, when vibration is transmitted to the cutting knife of the paper cutting machine, the stress at the two ends of the cutting knife is unbalanced is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of digital printing machines, and in particular relates to a transmission mechanism for cutting single sheets. Background Art

[0002] Paper cutters are traditional products used to handle the paper cutting needs of digital printing machines in the later stages. They have evolved from mechanical paper cutters to tape-controlled paper cutters, and then to microcomputer-controlled, color display, full-image operation-guided visual processing, and computer-aided cutting systems with external programming and editing of production data, making production preparation time shorter, cutting more accurate, labor-intensive, and safer to operate.

[0003] The existing transmission mechanism for cutting single sheets usually uses a motor to drive a crank, and the crank and connecting rod drive the cutting knife to move up and down to cut the paper. Because the use of a crank-connecting rod mechanism as a transmission mechanism can reduce the wear of the transmission mechanism compared to the traditional cam transmission mechanism, it improves the control accuracy of the paper cutter.

[0004] However, the current crank-connecting rod transmission mechanism for cutting single sheets still has some problems: the existing crank and connecting rod transmission mechanism is generally only arranged on one side of the paper cutter body. During the paper cutting process, the transmission mechanism composed of the crank and the connecting rod needs to move continuously. There will be a certain vibration when the transmission mechanism moves. When the vibration is transmitted to the cutting knife of the paper cutter, the forces on both ends of the cutting knife will be unbalanced. Continuous unbalanced forces can easily lead to reduced cutting accuracy of the cutting knife or damage the cutting knife. In this regard, a transmission mechanism for cutting single sheets is proposed. Utility Model Content

[0005] The utility model provides a transmission mechanism for cutting single sheets, which solves the problem that the transmission mechanism in the prior art is generally arranged on only one side of a paper cutter body. When vibration is transmitted to the cutting knife of the paper cutter, the forces on both ends of the cutting knife are unbalanced. Continuous unbalanced forces can easily lead to reduced cutting accuracy of the cutting knife or damage to the cutting knife.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a transmission mechanism for cutting single sheets, comprising a crank connecting rod part, a guide part and a balancing part for balancing the forces at both ends of a cutting knife, the two ends of the guide part respectively rotate to penetrate the two side walls of a paper cutter body and are connected to the crank connecting rod part and the balancing part, the crank connecting rod part drives the cutting knife to move up and down along the paper cutter body to cut the paper, and the crank connecting rod part drives the balancing part to move synchronously through the guide part, so that the forces at both ends of the cutting knife are balanced.

[0007] Preferably, the crank-connecting rod portion includes a first crank flywheel, a first connecting rod, a second connecting rod and a rocker arm. The first crank flywheel and the rocker arm are both rotatably arranged on one of the side walls of the paper cutter body. The two ends of the first connecting rod are respectively connected to the first crank flywheel and one end of the rocker arm, and the two ends of the second connecting rod are respectively connected to the other end of the rocker arm and one end of the cutting knife. The first crank flywheel drives the rocker arm to swing back and forth through the first connecting rod, and the rocker arm drives one end of the cutting knife through the second connecting rod, so that the cutting knife moves up and down along the paper cutter body.

[0008] Preferably, the balancing part includes a second crank flywheel and a third connecting rod rotatably arranged on the other side wall of the paper cutter body, the two ends of the third connecting rod are respectively connected to the second crank flywheel and the other end of the cutting knife, the first crank flywheel drives the second crank flywheel to move synchronously through the guide part, and the second crank flywheel drives the other end of the cutting knife through the third connecting rod, so that the forces at both ends of the cutting knife are balanced.

[0009] Preferably, the cutting knife is provided with a slide groove, and the paper cutter body is provided with a guide rail matching with the slide groove.

[0010] Preferably, the length from the connection point between the swing arm and the side wall of the paper cutter body to the connection point of the first connecting rod is greater than the length from the connection point between the swing arm and the side wall of the paper cutter body to the connection point of the second connecting rod.

[0011] Preferably, shock-absorbing pads are installed at both ends of the slide groove that contact the guide rail.

[0012] Preferably, a limit block for preventing the slide slot from detaching from the guide rail is detachably provided on the outer side of the guide rail.

[0013] The beneficial effects of the utility model are:

[0014] A crank connecting rod part and a balancing part are respectively arranged on the two side walls of the paper cutter body, and the crank connecting rod part and the balancing part are transmitted through the guide part. When the crank connecting rod part moves, the balancing part is driven to move synchronously. At this time, the crank connecting rod part and the balancing part drive the two ends of the cutting knife to move synchronously, so that the forces on the two ends of the cutting knife are balanced when the cutting knife moves up and down to cut the paper. This solves the problem in the prior art that when vibration is transmitted to the cutting knife of the paper cutter, the forces on the two ends of the cutting knife are unbalanced, and the problem of continuous unbalanced forces can easily lead to reduced cutting accuracy of the cutting knife or damage to the cutting knife. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the crank connecting rod structure of the utility model;

[0018] Figure 3 It is a schematic diagram of the cooperation between the slideway and the guide rail of the utility model.

[0019] Description of main component symbols:

[0020] In the figure: 1. paper cutter body; 2. crank connecting rod part; 21. first crank flywheel; 22. first connecting rod; 23. second connecting rod; 24. rocker arm; 3. guide part; 4. balance part; 41. second crank flywheel; 42. third connecting rod; 5. cutting knife; 6. limit block; 7. slide groove; 8. guide rail. DETAILED DESCRIPTION

[0021] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0022] See also Figure 1-3 A transmission mechanism for cutting single sheets, comprising a crank connecting rod part 2, a guide part 3 and a balancing part 4 for balancing the forces at both ends of a cutting blade 5, wherein the crank connecting rod part 2 is connected to a first servo motor, such as Figure 1 As shown, it can be seen that the inside of the paper cutter body 1 in the figure is the first servo motor, and the larger motor outside the paper cutter body 1 is the second servo motor, which is used to drive the paper to be cut to move forward to the bottom of the cutting knife 5. In addition, the first servo motor and the second servo motor are both externally connected to the control system, and the two ends of the guide part 3 rotate respectively through the two side walls of the paper cutter body 1 and are connected to the crank connecting rod part 2 and the balancing part 4. The guide part 3 is a guide rod, and the crank connecting rod part 2 drives the cutting knife 5 to move up and down along the paper cutter body 1 to cut the paper. The crank connecting rod part 2 drives the balancing part 4 to move synchronously through the guide part 3, so that the forces at both ends of the cutting knife 5 are balanced.

[0023] At present, the transmission mechanism for cutting single sheets usually adopts a motor to drive a crank, and drives the cutting knife 5 to move up and down to cut the paper through the crank and the connecting rod. Because the crank-connecting rod mechanism used as the transmission mechanism can reduce the wear of the transmission mechanism compared with the traditional cam transmission mechanism, the control accuracy of the paper cutter is improved. However, the existing crank and connecting rod transmission mechanism is generally only arranged on one side of the paper cutter body 1. During the paper cutting process, the transmission mechanism composed of the crank and the connecting rod needs to move continuously. There will be a certain vibration when the transmission mechanism moves. When the vibration is transmitted to the cutting knife 5 of the paper cutter, the forces at both ends of the cutting knife 5 will be unbalanced. Continuous unbalanced forces can easily lead to reduced cutting accuracy of the cutting knife 5 or damage to the cutting knife 5.

[0024] In order to solve the above problems, in the present embodiment, a crank connecting rod portion 2 and a balancing portion 4 are respectively provided on the two side walls of the paper cutter body 1, and then the crank connecting rod portion 2 and the balancing portion 4 are transmitted through the guide portion 3. When the crank connecting rod portion 2 moves, the balancing portion 4 is driven to move synchronously. At this time, the crank connecting rod portion 2 and the balancing portion 4 drive the two ends of the cutting knife 5 to move synchronously, so that the forces at the two ends of the cutting knife 5 are balanced when the cutting knife 5 moves up and down to cut the paper. This solves the problem in the prior art that when vibration is transmitted to the cutting knife 5 of the paper cutter, the forces at the two ends of the cutting knife 5 are unbalanced, and the continuous unbalanced forces can easily lead to reduced cutting accuracy of the cutting knife 5 or damage to the cutting knife 5.

[0025] The crank-connecting rod part 2 used in the prior art is mostly a simple combination of a crank and a rocker. However, considering that the paper cutter here is used to handle the paper cutting needs of the digital printing machine in the later stage, when the demand is relatively large, it needs to be used for a long time. When an ordinary crank plus a rocker is used for a long time, the friction loss between the crank and the paper cutter is large, which causes the entire transmission mechanism to be easily damaged. In order to solve this problem, in one embodiment, the crank-connecting rod part 2 includes a first crank flywheel 21, a first connecting rod 22, a second connecting rod 23 and a rocker 24. The first crank The flywheel 21 and the swing rod 24 are both rotatably arranged on one of the side walls of the paper cutter body 1. The two ends of the first connecting rod 22 are respectively connected to the first crank flywheel 21 and one end of the swing rod 24. The two ends of the second connecting rod 23 are respectively connected to the other end of the swing rod 24 and one end of the cutting knife 5. The first crank flywheel 21 drives the swing rod 24 to swing back and forth through the first connecting rod 22. The swing rod 24 drives one end of the cutting knife 5 through the second connecting rod 23, so that the cutting knife 5 moves up and down along the paper cutter body 1. By arranging the crank flywheel, the flywheel is connected to the paper cutter body 1 through the bearing, as shown in FIG. Figure 1 The bearing between the flywheel and the paper cutter body 1 can be seen in the figure. Figure 1 The bearings are not numbered. Similarly, the rocker arm 24 is rotatably connected to one of the side walls of the paper cutter body 1 through a bearing, including the first crank flywheel 21 mentioned below and the other side wall of the paper cutter body 1 is also connected through a bearing. The bearings in the above locations can be the same, or different ones can be selected according to actual needs. In addition, the first crank flywheel 21 is driven by a first servo motor. When the first servo motor drives the first crank flywheel 21 to rotate, the first crank flywheel 21 performs a circular motion, and the first crank flywheel 21 drives the rocker arm 24 to swing back and forth through the first connecting rod 22, and the reciprocating swing of the rocker arm 24 drives the second connecting rod 23 to move synchronously, and the second connecting rod 23 drives the cutting knife 5 to move up and down along the paper cutter body 1 to cut the paper.

[0026] At the same time, when the crank connecting rod part 2 moves, the crank connecting rod part 2 drives the balancing part 4 to move through the guide part 3. In order to make the balancing part 4 better balance the forces at the two ends of the cutting knife 5, in one embodiment, the balancing part 4 includes a second crank flywheel 41 and a third connecting rod 42 rotatably arranged on the other side wall of the paper cutter body 1, and the two ends of the third connecting rod 42 are respectively connected to the second crank flywheel 41 and the other end of the cutting knife 5. The first crank flywheel 21 drives the second crank flywheel 41 to move synchronously through the guide part 3, and the second crank flywheel 41 drives the other end of the cutting knife 5 through the third connecting rod 42, so that the forces at the two ends of the cutting knife 5 are balanced. To ensure the force balance at the two ends of the cutting knife 5, it is necessary to ensure that the two ends of the cutting knife 5 move synchronously. In addition, it is also necessary to ensure that the two ends of the cutting knife 5 are synchronized. During step movement, no shaking will occur, and the crank connecting rod part 2 and the balancing part 4 are connected by the guide part 3, so that the crank connecting rod part 2, the balancing part 4, the guide part 3 and the paper cutter body 1 form a whole, which can ensure that when the two ends of the cutting knife 5 move synchronously, no shaking will occur. During specific movement, when the first crank flywheel 21 moves, the first crank flywheel 21 drives the guide part 3 to rotate along the paper cutter body 1, and the guide part 3 drives the second crank flywheel 41 to rotate synchronously, and the second crank flywheel 41 drives the third connecting rod 42 to swing back and forth, and the third connecting rod 42 drives the other end of the cutting knife 5 to move up and down along the paper cutter body 1 to cut the paper, and finally the two ends of the cutting knife 5 move synchronously, so that when the cutting knife 5 moves up and down to cut the paper, the forces at the two ends of the cutting knife 5 are balanced.

[0027] In order to ensure that the cutting blade 5 does not deviate when moving up and down, in one embodiment, a slide groove 7 is provided on the cutting blade 5, and a guide rail 8 matching the slide groove 7 is provided on the paper cutter body 1. Figure 3 As shown, in addition, since the rotation of the first crank flywheel 21 drives the rocker arm 24 to swing back and forth, and the back and forth swing of the rocker arm 24 drives the second connecting rod 23 to move synchronously, the second connecting rod 23 drives one end of the cutting knife 5 to move up and down along the paper cutter body 1 to cut the paper. In order to ensure that the existence of the rocker arm 24 will not cause interference to the connection between the two ends, in one embodiment, the length from the connection point of the rocker arm 24 and the side wall of the paper cutter body 1 to the connection point of the first connecting rod 22 is greater than the length from the connection point of the rocker arm 24 and the side wall of the paper cutter body 1 to the connection point of the second connecting rod 23.

[0028] During the cutting process of the cutting knife 5, the cutting knife 5 will vibrate partially due to inertia each time it moves forward or backward to the limit position. In order to further reduce this vibration and increase the service life of the cutting knife 5, in one embodiment, shock-absorbing pads are installed at both ends of the slide 7 that contact the guide rail 8. The shock-absorbing pads here are rubber pads or other elastic pads. By providing the shock-absorbing pads, the cutting knife 5 can avoid collision and vibration with the guide rail 8 each time it moves forward or backward to the limit position. In addition, a limit block 6 for preventing the slide 7 from separating from the guide rail 8 is detachably provided on the outer side of the guide rail 8. On the one hand, this limit block 6 can prevent the slide 7 from separating from the guide rail 8. On the other hand, the cutting knife 5 can be replaced or repaired by removing the limit block 6. The limit block 6 here is detachable through a limit pin, such as Figure 1 or as shown in 3.

[0029] The working principle and use process of this utility model:

[0030] When in use, the first servo motor is started. When the first servo motor drives the first crank flywheel 21 to rotate, the first crank flywheel 21 makes a circular motion, and the first crank flywheel 21 drives the swing rod 24 to swing back and forth through the first connecting rod 22, and the swing rod 24 swings back and forth to drive the second connecting rod 23 to move synchronously, and the second connecting rod 23 drives one end of the cutting knife 5 to move up and down along the paper cutter body 1 to cut the paper; at the same time, the first crank flywheel 21 drives the second crank flywheel 41 to make a circular motion through the guide rod, and the second crank flywheel 41 drives the third connecting rod 42 to swing back and forth, and the third connecting rod 42 drives the other end of the cutting knife 5 to move up and down along the paper cutter body 1 to cut the paper, and finally the two ends of the cutting knife 5 move synchronously, so that the forces on the two ends of the cutting knife 5 are balanced when the cutting knife 5 moves up and down to cut the paper.

[0031] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A transmission mechanism for cutting single sheets, characterized in that: It includes a crank connecting rod part, a guide part and a balancing part for balancing the forces at both ends of the cutting knife. The two ends of the guide part rotate to penetrate the two side walls of the paper cutter body and are connected to the crank connecting rod part and the balancing part. The crank connecting rod part drives the cutting knife to move up and down along the paper cutter body to cut the paper. The crank connecting rod part drives the balancing part to move synchronously through the guide part, so that the forces at both ends of the cutting knife are balanced.

2. A transmission mechanism for cutting single sheets according to claim 1, characterized in that: The crank-connecting rod portion includes a first crank flywheel, a first connecting rod, a second connecting rod and a rocker arm. The first crank flywheel and the rocker arm are both rotatably arranged on one of the side walls of the paper cutter body. The two ends of the first connecting rod are respectively connected to the first crank flywheel and one end of the rocker arm, and the two ends of the second connecting rod are respectively connected to the other end of the rocker arm and one end of the cutting knife. The first crank flywheel drives the rocker arm to swing back and forth through the first connecting rod, and the rocker arm drives one end of the cutting knife through the second connecting rod, so that the cutting knife moves up and down along the paper cutter body.

3. A transmission mechanism for cutting single sheets according to claim 2, characterized in that: The balancing part includes a second crank flywheel and a third connecting rod rotatably arranged on the other side wall of the paper cutter body, the two ends of the third connecting rod are respectively connected to the second crank flywheel and the other end of the cutting knife, the first crank flywheel drives the second crank flywheel to move synchronously through the guide part, and the second crank flywheel drives the other end of the cutting knife through the third connecting rod, so that the forces on the two ends of the cutting knife are balanced.

4. The transmission mechanism for cutting single sheets according to claim 2, characterized in that: The cutting knife is provided with a slide groove, and the paper cutter body is provided with a guide rail matched with the slide groove.

5. The transmission mechanism for cutting single sheets according to claim 2, characterized in that: The length from the connection point between the swing arm and the side wall of the paper cutter body to the connection point of the first connecting rod is greater than the length from the connection point between the swing arm and the side wall of the paper cutter body to the connection point of the second connecting rod.

6. The transmission mechanism for cutting single sheets according to claim 4, characterized in that: Shock-absorbing pads are installed at both ends of the slideway that contact the guide rail.

7. The transmission mechanism for cutting single sheets according to claim 6, characterized in that: A limit block for preventing the slide slot from falling off the guide rail is detachably provided on the outer side of the guide rail.

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