A punching machine

Abstract

The utility model discloses a punching machine, comprising a base (1); a knife frame (2) which can be slidably mounted on the base (1); a punching cutter head (3) which is mounted on the knife frame (2); and a driving mechanism (5) which is used to drive the knife frame (2) to move up and down; the utility model is characterized in that the utility model also comprises a paper pressing assembly (4), the paper pressing assembly (4) comprising a slide bar (41) which extends in a vertical direction and can be slidably mounted on the knife frame (2); a pressing plate (42) which is connected to the bottom end of the slide bar (41) and is located below the knife frame (2); and a first elastic member (43) which acts between the knife frame (2) and the pressing plate (42) so that the pressing plate (42) always has a downward pressing tendency. Compared with the prior art, the punching machine of the utility model can prevent the paper from being displaced during the punching process, thereby causing the punching to deviate, and the paper from being carried up by the punching cutter head during the paper retracting process.

Description

Technical Field

[0001] The utility model relates to the technical field of office equipment, in particular to a hole puncher. Background Art

[0002] When punching paper, the punching machine generally uses the lever principle to punch the paper. The punching punch moves downward by manually pressing the pressure rod, and the punching punch punches the paper. For details, please refer to the Chinese patent application number CN201910119208.8 "A connecting rod anti-hand insertion heavy-duty paper punching machine".

[0003] However, the existing hole punching machines do not have a paper pressing function. Therefore, on the one hand, if the paper is not pressed down by hand during punching, the paper may shift, resulting in offset of the punching. On the other hand, when the cutter head withdraws from the paper hole after punching, that is, when the paper is ejected, the cutter head may bring up part of the paper on the top, and the paper needs to be pressed down by hand to be taken out. If the paper is not pressed down by hand, the paper brought up by the cutter head is not easy to take out, and sometimes the paper may be torn, making the punching operation very inconvenient. Utility Model Content

[0004] The first technical problem to be solved by the utility model is to provide a punching machine that can prevent paper from being displaced during the punching process, resulting in offset of the punching holes, and paper from being carried up by the punching head during the paper retracting process, in response to the current status of the prior art.

[0005] The second technical problem to be solved by the utility model is to provide a punching machine which can prevent the paper from being carried up by the punching knife head during the paper retracting process.

[0006] The technical solution adopted by the utility model to solve the above-mentioned first and second technical problems is: a punching machine, comprising

[0007] Machine base;

[0008] A tool holder is slidably mounted on the machine base;

[0009] A punching cutter head extending in a vertical direction and mounted on the cutter holder; and

[0010] A driving mechanism, mounted on the machine base, for driving the tool holder to move up and down relative to the machine base;

[0011] It is characterized in that: it also includes a paper pressing component, the paper pressing component includes

[0012] A slide rod extending in a vertical direction and slidably mounted on the tool holder;

[0013] A pressing plate connected to the bottom end of the slide bar and located below the tool holder; and

[0014] The first elastic member acts between the tool holder and the pressing plate to make the pressing plate always have a downward pressing tendency.

[0015] In order to facilitate the installation of the slide rod, the tool holder has a cavity inside, the cavity has a guide seat, and the guide seat has a through hole for the slide rod to pass through.

[0016] In order to limit the extreme position of the sliding rod relative to the tool holder, a limiting protrusion is provided on the peripheral wall at the top of the sliding rod. In a free state, the limiting protrusion abuts against the top surface of the guide seat, and the bottom end of the punching head is higher than the bottom surface of the pressure plate.

[0017] In order to facilitate the installation of the first elastic member, the first elastic member is a compression spring, which is sleeved on the outer periphery of the slide rod, and the two ends of the compression spring are respectively abutted against the bottom surface of the guide seat and the top surface of the pressure plate.

[0018] In order to improve versatility, the tool holder, punching head and paper pressing assembly form a tool module, each tool module includes a tool holder, a punching head and two groups of paper pressing assemblies, and the two groups of paper pressing assemblies are symmetrically arranged on the left and right sides of the corresponding punching head.

[0019] In order to facilitate the matching connection between the tool holder and the punching head and paper pressing assembly, the tool holder includes a left tool holder seat protective shell, a left tool holder seat, a right tool holder seat and a right tool holder seat protective shell which are arranged from left to right and connected to each other by fasteners. The punching head is clamped between the left tool holder seat and the right tool holder seat. The sliding rods of the two groups of paper pressing assemblies are respectively recorded as left sliding rods and right sliding rods. The left sliding rod is clamped between the left tool holder seat protective shell and the left tool holder seat, and the right sliding rod is clamped between the right tool holder seat and the right tool holder seat protective shell.

[0020] In order to achieve simultaneous cutting of multiple holes, the number of the tool modules is at least two groups, and they are arranged at intervals in the left-right direction.

[0021] In order to facilitate the installation of the tool holder, the machine base is provided with a slide groove extending in a vertical direction, and the tool holder can be installed in the slide groove so as to slide up and down.

[0022] In order to realize the labor-saving lever, the driving mechanism includes

[0023] A handle, the bottom of which is rotatably connected to the top of the base via a first pin;

[0024] A connecting block, the top of which is rotatably connected to the lower part of the handle via a second pin shaft, and the bottom of which is rotatably connected to the top of the tool holder via a third pin shaft; and

[0025] The second elastic member acts between the base and the handle to make the handle always have a tendency to flip upward.

[0026] In order to facilitate the installation of the second elastic member, the second elastic member is a torsion spring, which is sleeved on the outer periphery of the first pin shaft, and the two ends of the torsion spring are respectively abutted against the base and the second pin shaft.

[0027] Compared with the prior art, the advantages of the utility model are: a paper pressing assembly is composed of a slide rod, a pressure plate and a first elastic member. During the punching and paper feeding process, the pressure plate is always in contact with the top of the paper under the elastic force of the first elastic member. On the one hand, it can prevent the paper from being displaced during the punching process and causing the punching to be offset; on the other hand, it can prevent the paper from being carried up by the punching head during the paper feeding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the embodiment of the punching machine of the utility model in a free state;

[0029] Figure 2 for Figure 1 Schematic diagram of the three-dimensional decomposition of

[0030] Figure 3 for Figure 2 Schematic diagram of the three-dimensional exploded view of the middle knife holder, the punching knife head and the paper pressing assembly;

[0031] Figure 4 for Figure 2 A schematic diagram of the three-dimensional structure of the middle driving mechanism;

[0032] Figure 5 for Figure 1 A partial longitudinal cross-sectional view of

[0033] Figure 6 for Figure 1 a partial longitudinal sectional view in another direction;

[0034] Figure 7 for Figure 6 A partial longitudinal cross-sectional view of the moment when the pressing plate just touches the paper during the downward pressing of the middle handle;

[0035] Figure 8 for Figure 7 A partial longitudinal cross-sectional view of the middle handle when it is fully pressed down;

[0036] Fig. 9 for Figure 8 A partial longitudinal cross-sectional view of the punch head after it leaves the paper while the middle handle is lifted. DETAILED DESCRIPTION

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0039] like Figures 1 to 9 The figure shows a preferred embodiment of the punching machine of the utility model. The punching machine comprises a base 1, a tool holder 2, a punching tool head 3, a paper pressing assembly 4 and a driving mechanism 5.

[0040] The machine base 1 has two slide grooves 11 spaced apart from each other on the left and right sides, and each slide groove 11 extends in the vertical direction.

[0041] The tool holder 2, the punch head 3 and the paper pressing assembly 4 constitute a tool module, which is a modular component. The modular design can increase the commonality and interchangeability between products to improve production efficiency, ensure product quality and reduce production costs, storage costs, etc.; and in the subsequent development of new two-hole heavy-duty punching machines, three-hole heavy-duty punching machines, and four-hole heavy-duty punching machines, it can simplify design requirements and reduce the parts that need to be redeveloped.

[0042] In this embodiment, there are two groups of tool modules, which correspond one to one with the above-mentioned slide grooves 11. Each group of tool modules includes a tool holder 2, a punching head 3 and two groups of paper pressing assemblies 4. The two groups of paper pressing assemblies 4 are symmetrically arranged on the left and right sides of the corresponding punching head 3.

[0043] For each tool module:

[0044] The tool holder 2 can be slidably installed in the corresponding slide groove 11. Specifically, the tool holder 2 includes a left tool holder seat protective shell 21, a left tool holder seat 22, a right tool holder seat 23 and a right tool holder seat protective shell 24 which are arranged from left to right and connected to each other through fasteners; the cavity between the left tool holder seat protective shell 21 and the left tool holder seat 22 and the cavity between the right tool holder seat 23 and the right tool holder seat protective shell 24 are both provided with a guide seat 25, and the guide seat 25 has a vertically extending through hole 251.

[0045] The punching head 3 extends in the vertical direction and is installed at the bottom of the corresponding tool holder 2 for punching holes in the paper. Specifically, the punching head 3 is sandwiched between the left tool holder seat 22 and the right tool holder seat 23.

[0046] The paper pressing assembly 4 includes a slide bar 41 , a pressing plate 42 and a first elastic member 43 . Specifically, the slide rod 41 extends in the vertical direction and can be slidably inserted into the through hole 251 of the corresponding tool holder 2. A limiting protrusion 411 is convexly provided on the peripheral wall at the top of the slide rod 41. The slide rods 41 of the two groups of paper pressing assemblies 4 are respectively recorded as the left slide rod and the right slide rod. The left slide rod is clamped between the left tool holder seat protective shell 21 and the left tool holder seat 22, and the right slide rod is clamped between the right tool holder seat 23 and the right tool holder seat protective shell 24; the pressure plate 42 is connected to the bottom end of the slide rod 41 and is located below the corresponding tool holder 2; the first elastic member 43 is a compression spring, which is sleeved on the outer periphery of the slide rod 41, and the two ends of the compression spring are respectively abutted against the bottom surface of the guide seat 25 and the top surface of the pressure plate 42, so that the pressure plate 42 always has a tendency to press downward. In the free state, the limiting protrusion 411 abuts against the top surface of the guide seat 25, and the bottom end of the punching head 3 is higher than the bottom surface of the pressure plate 42.

[0047] The driving mechanism 5 is installed on the machine base 1, and is used to drive the tool holder 2 to move up and down relative to the machine base 1. In this embodiment, the driving mechanism 5 includes a handle 51, a connecting block 52 and a second elastic member 53. Specifically, the bottom of the handle 51 is rotatably connected to the top of the machine base 1 through a first pin 511; the top of the connecting block 52 is rotatably connected to the lower part of the handle 51 through a second pin 521, and the bottom of the connecting block 52 is rotatably connected to the top of the tool holder 2 through a third pin 522; the second elastic member 53 is a torsion spring, which is sleeved on the outer periphery of the first pin 511, and the two ends of the torsion spring are respectively abutted on the machine base 1 and the second pin 521, so that the handle 51 always has a tendency to flip upward. The above-mentioned driving mechanism 5 uses the principle of lever, and the curved motion of the handle 51 is converted into the linear motion of the tool holder 2 through the connecting rod.

[0048] The working principle of this embodiment is as follows:

[0049] (1) In the initial state, if Figure 5 and Figure 6 As shown, the punching machine is in a free state, the limiting protrusion 411 abuts against the top surface of the guide seat 25, the bottom end of the punching head 3 is higher than the bottom surface of the pressing plate 42, and there is a gap between the pressing plate 42 and the bottom plate of the frame 1 for placing paper;

[0050] (2) When punching is required, first place paper of any thickness on the bottom plate of the frame 1 and insert the part to be punched into the gap below the pressing plate 42, then press the handle 51 downward to drive the knife holder 2 downward until the pressing plate 42 abuts against the top of the paper to achieve the paper pressing function (such as Figure 7 shown);

[0051] Then, the handle 51 is pressed downward to drive the knife holder 2 downward, so that the punching knife head 3 passes through the paper to punch holes (such as Figure 8As shown), during this process, the pressing plate 42 is always in contact with the top of the paper under the elastic force of the first elastic member 43 to maintain the paper pressing function, thereby preventing the paper from being displaced and causing the punching to be offset;

[0052] Finally, after the punching is completed, the handle 51 is lifted up to drive the knife holder 2 to move up so that the punching head 3 is separated from the paper. During this process, the pressure plate 42 is always in contact with the top of the paper under the elastic force of the first elastic member 43 to prevent the paper from being carried up by the punching head 3, thereby realizing the paper retreat function, until the limiting protrusion 411 is in contact with the top surface of the guide seat 25, the pressure plate 42 will move up synchronously with the knife holder 2 to separate from the paper, and the user can take away the punched paper at this time.

Claims

1. A punching machine, comprising Machine base (1); A tool holder (2) is mounted on the machine base (1) so as to be slidable up and down; A punching cutter head (3) extending in a vertical direction and mounted on the cutter holder (2); as well as A driving mechanism (5) is mounted on the machine base (1) and is used to drive the tool holder (2) to move up and down relative to the machine base (1); The invention is characterized in that: it also includes a paper pressing component (4), the paper pressing component (4) includes A slide rod (41) extending in a vertical direction and slidably mounted on the tool holder (2); A pressing plate (42) connected to the bottom end of the sliding rod (41) and located below the tool holder (2); and The first elastic member (43) acts between the tool holder (2) and the pressing plate (42) so that the pressing plate (42) always has a downward pressing tendency.

2. The punching machine according to claim 1, characterized in that: The tool holder (2) has a cavity inside, a guide seat (25) inside the cavity, and a through hole (251) for the slide rod (41) to pass through the guide seat (25).

3. The punching machine according to claim 2, characterized in that: A limiting protrusion (411) is convexly provided on the peripheral wall at the top of the sliding rod (41). In a free state, the limiting protrusion (411) abuts against the top surface of the guide seat (25), and the bottom end of the punching head (3) is higher than the bottom surface of the pressing plate (42).

4. The punching machine according to claim 2, characterized in that: The first elastic member (43) is a compression spring which is sleeved on the outer periphery of the slide rod (41), and the two ends of the compression spring respectively abut against the bottom surface of the guide seat (25) and the top surface of the pressure plate (42).

5. The punching machine according to claim 1, characterized in that: The tool holder (2), the punching head (3) and the paper pressing assembly (4) constitute a tool module. Each set of tool modules includes one tool holder (2), one punching head (3) and two sets of paper pressing assemblies (4). The two sets of paper pressing assemblies (4) are symmetrically arranged on the left and right sides of the corresponding punching head (3).

6. The punching machine according to claim 5, characterized in that: The tool holder (2) comprises a left tool holder seat protective shell (21), a left tool holder seat (22), a right tool holder seat (23) and a right tool holder seat protective shell (24) which are arranged in sequence from left to right and connected to each other by fasteners; the punching tool head (3) is clamped between the left tool holder seat (22) and the right tool holder seat (23); the sliding rods (41) of the two groups of paper pressing assemblies (4) are respectively recorded as the left sliding rod and the right sliding rod; the left sliding rod is clamped between the left tool holder seat protective shell (21) and the left tool holder seat (22); the right sliding rod is clamped between the right tool holder seat (23) and the right tool holder seat protective shell (24).

7. The punching machine according to claim 5, characterized in that: The number of the tool modules is at least two groups, and they are arranged at intervals along the left-right direction.

8. The punching machine according to claim 1, characterized in that: The machine base (1) is provided with a slide groove (11) extending in a vertical direction, and the tool holder (2) can be installed in the slide groove (11) in a manner of sliding up and down.

9. The punching machine according to any one of claims 1 to 8, characterized in that: The driving mechanism (5) comprises A handle (51), the bottom of which is rotatably connected to the top of the base (1) via a first pin shaft (511); A connecting block (52), the top of which is rotatably connected to the lower part of the handle (51) via a second pin shaft (521), and the bottom of which is rotatably connected to the top of the tool holder (2) via a third pin shaft (522); and The second elastic member (53) acts between the base (1) and the handle (51) so that the handle (51) always has a tendency to flip upward.

10. The punching machine according to claim 9, characterized in that: The second elastic member (53) is a torsion spring, which is sleeved on the outer periphery of the first pin shaft (511), and the two ends of the torsion spring are respectively in contact with the machine base (1) and the second pin shaft (521).

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