Flexible shearing electric scissors

Abstract

The flexible shearing electric scissors comprise a speed reducing motor, a lower cam, an upper cam and a shearing head which are arranged in sequence, an output shaft of the speed reducing motor is in driving connection with the axis of the lower cam, and an upper spiral curved surface and a lower spiral curved surface which are attached to each other are formed in the connecting position of the upper cam and the lower cam. A spiral groove is formed in the upper spiral curved surface, a round-head pin which moves in the axial direction is arranged in the lower cam, the round-head pin protrudes and extends to be inserted into the spiral groove, and the depth of the spiral groove is gradually reduced from the position close to the top surface of the upper cam to the position close to the bottom surface of the upper cam. A compression spring is arranged at the end, away from the spiral groove, of the round head pin, and a horn mouth for clamping the tail of the shearing head is formed in the top face of the upper cam. The flexible spring is adopted for pushing, flexible shearing is achieved, and meanwhile the situation that the scissor head cannot be closed and is excessively closed is prevented.

Description

Technical Field

[0001] This application relates to the field of scissors, and in particular to a flexible electric shearing scissors. Background Technology

[0002] Currently, the shearing shears available in the injection molding industry can be broadly divided into two categories. The first category is traditional, purely manual shears, commonly known as "sprue pliers." Sprue pliers are inefficient, and trimming large quantities of sprue marks and other parts of injection molded components is time-consuming, labor-intensive, and involves a lot of repetitive work, easily causing operator fatigue, slowing down production, and increasing labor costs. The second category is pneumatic shears powered by compressed air. Compared to traditional sprue pliers, pneumatic shears can significantly reduce labor costs, but they are generally only used on high-volume production lines. They also require corresponding auxiliary equipment and site coordination. For example, they need compressed air that meets the required pressure, which needs to be stored, dried, and piped for transportation. They also need to be equipped with corresponding control electrical components. Setting up this series of equipment represents a significant investment.

[0003] Electric scissors can replace the two main types of scissors mentioned above to complete the cutting work. Users only need to place the sprue to be cut within the cutting range of the scissors and press the switch to achieve sprue cutting. While freeing up manpower, it also requires little investment, does not take up space, and can complete the work without other auxiliary equipment.

[0004] Our company's electric shears are mainly used in the injection molding industry for sprue cutting, injection part trimming, model cutting, etc. The target audience is mainly injection molding production lines, Gundam model enthusiasts, crafting experts, and related studios. They are mainly used to cut the sprue joint of injection molded parts, cut the support parts between injection molded parts and frames to separate them, and can also trim model parts.

[0005] The electric scissors body and the scissor head are separable. The scissor head is a consumable part that can be replaced. Due to unreasonable design, existing electric scissors often fail to close or over-close at the end of a cutting stroke, damaging the scissor head when there are certain errors in production. Summary of the Invention

[0006] The purpose of this invention is to provide a flexible electric shearing scissor that uses a flexible spring to drive the shearing, thereby achieving flexible cutting and preventing the scissor head from failing to close or closing excessively.

[0007] To achieve the above objectives, the present invention provides the following technical solution.

[0008] This application discloses a flexible electric shearing scissors, comprising a geared motor, a lower cam, an upper cam, and a shearing head arranged sequentially. The output shaft of the geared motor is driven and connected to the axis of the lower cam. The connection between the upper cam and the lower cam forms an upper helical surface and a lower helical surface that fit together. A helical groove is formed on the upper helical surface. A round-headed pin is provided inside the lower cam and moves axially. The round-headed pin protrudes and inserts into the helical groove. The depth of the helical groove gradually decreases from near the top surface of the upper cam to its bottom surface. A compression spring is provided at the end of the round-headed pin away from the helical groove. A flared opening is formed on the top surface of the upper cam to hold the tail of the shearing head.

[0009] Initially, the round-headed pin does not contact the bottom surface of the spiral groove. When the reduction motor drives the lower cam to rotate, the lower spiral surface rotates, thereby pushing the upper spiral surface to move axially, causing the flared mouth to retract the tail of the shear head, thus achieving shearing.

[0010] During the shearing process, as the depth of the spiral groove gradually becomes shallower, the round-headed pin contacts and abuts against the spiral groove, and the round-headed pin continues to push the upper cam to move axially, thus continuing to achieve shearing;

[0011] After shearing is completed, the blade of the shearing head closes, the upper cam can no longer move, and the compression spring under the round-headed pin is compressed, preventing the upper cam from moving excessively and thus preventing the blade of the shearing head from closing excessively.

[0012] Preferably, in the above-mentioned flexible shearing electric scissors, a planar bearing and a bearing seat are further provided between the reduction motor and the lower cam. The bottom surface of the planar bearing is fixed to the reduction motor, the top surface of the planar bearing is fixed to the bearing seat, and the bottom surface of the lower cam is fixed to the bearing seat.

[0013] Preferably, in the above-mentioned flexible electric shears, the bottom of the compression spring is supported on the top surface of the planar bearing, and the interior of the lower cam and the outer periphery of the round-headed pin are respectively provided with a first annular surface and a second annular surface that support each other.

[0014] Preferably, in the above-mentioned flexible electric shears, the cross-section of the output shaft is D-shaped, and the axis of the lower cam is formed with a D-shaped hole that fits into the output shaft.

[0015] Preferably, in the above-mentioned flexible shearing electric scissors, two upper helical surfaces are arranged symmetrically at 180 degrees, and an axial drop surface extending along the axis of the upper cam is formed at the connection of the two upper helical surfaces.

[0016] Preferably, in the above-mentioned flexible electric shears, a first support plane is formed on both sides of the upper cam, a first outer shell is provided on the outer side of the upper cam, and a second support plane is formed on the inner side of the first outer shell, which fits and abuts against the first support plane to prevent the upper cam from rotating around the axial direction.

[0017] Preferably, in the above-mentioned flexible electric shears, the upper cam has circular holes formed on both sides of the flared opening, a return spring is provided in the circular hole, the top of the return spring is supported by the shearing bracket, and the anchor of the shearing head is installed on the shearing bracket.

[0018] Preferably, in the above-mentioned flexible shearing electric shears, an oil storage groove is formed concave on the lower helical surface.

[0019] Preferably, in the above-mentioned flexible electric shears, the first outer shell is installed on the main body shell, and an anti-slip sleeve is provided on the outer side of the first outer shell.

[0020] Preferably, in the above-mentioned flexible electric shears, the geared motor is driven by a battery or an external power source.

[0021] Compared with the prior art, the advantage of the present invention is that by using a compression spring to push the round-headed pin, the upper cam is pushed to clamp the tail of the shear head, thus realizing the shearing action. This achieves flexible shearing and also prevents the shear head from failing to close or from closing excessively. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 The image shown is a perspective view of the flexible electric shears in an embodiment of the present invention;

[0024] Figure 2 The diagram shown is an exploded view of the flexible electric shears in an embodiment of the present invention.

[0025] Figure 3 As shown Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 The image shown is a partial exploded view of the flexible electric shears in an embodiment of the present invention;

[0027] Figure 5 The figure shown is a cross-sectional view of the lower cam in an embodiment of the present invention. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Combination Figure 1-5 As shown, the flexible electric shears 100 includes a geared motor 101, a lower cam 102, an upper cam 103, and a shearing head 104 arranged sequentially. The output shaft 105 of the geared motor 101 is driven and connected to the axis of the lower cam 102. The connection between the upper cam 103 and the lower cam 102 has an upper helical surface 106 and a lower helical surface 107 that fit together. A helical groove 108 is formed on the upper helical surface 106. A round-headed pin 109 that moves axially is provided inside the lower cam 102. The round-headed pin 109 protrudes and inserts into the helical groove 108. The depth of the helical groove 108 gradually decreases from the top surface near the top surface of the upper cam 103 to its bottom surface. A compression spring 110 is provided at the end of the round-headed pin 109 away from the helical groove 108. A flared opening 110 for clamping the tail of the shearing head 104 is provided on the top surface of the upper cam 103.

[0030] Initially, the round-headed pin 109 does not contact the bottom surface of the spiral groove 108. When the reduction motor 101 drives the lower cam 102 to rotate, the lower spiral surface 107 rotates, thereby pushing the upper spiral surface 106 to move axially, causing the bell mouth 110 to retract the tail of the shear head 104, thus achieving shearing.

[0031] During the shearing process, as the depth of the spiral groove 108 gradually becomes shallower, the round-headed pin 109 contacts and abuts against the spiral groove 108, and the round-headed pin 109 continues to push the upper cam 103 to move axially, thus continuing to achieve shearing.

[0032] After shearing is completed, the blade of the shear head 104 closes, the upper cam 103 can no longer move, and the compression spring 110 under the round-headed pin 109 is compressed, preventing the upper cam 103 from moving excessively, thus preventing the blade of the shear head 104 from closing excessively.

[0033] In practice, the geared motor drives the lower cam to rotate. Since the upper cam cannot rotate and the helical surface lifts the upper cam, the output of rotation around the axis is changed to the output of movement along the axis. In other words, the upper cam is finally moved along the axis. When the upper cam moves axially, the tail of the shear head is clamped by the flared mouth, while the shear head remains stationary. This causes the tail to retract and close, thus achieving the contraction and closure of the shear head blade.

[0034] The beneficial effects of this technical solution are as follows: instead of simply lifting the upper cam through the hard contact of the two cams, it is initially lifted by the hard contact of the lower cam, and then lifted by the contact of the round-headed pin. The bottom of the round-headed pin is a compression spring, which realizes flexible shearing and prevents the blade from failing to close. When the blade has closed, but the round-headed pin continues to push upward, and the upper cam cannot continue to move due to the closed blade, the compression spring will be compressed, thus preventing the blade from over-closing.

[0035] Furthermore, a plane bearing 111 and a bearing seat 112 are provided between the geared motor 101 and the lower cam 102. The bottom surface of the plane bearing 111 is fixed to the geared motor 101, the top surface of the plane bearing 111 is fixed to the bearing seat 112, and the bottom surface of the lower cam 102 is fixed to the bearing seat 112.

[0036] In this embodiment, since the lower cam rotates, it cannot be directly supported on the output shaft and needs to be supported by a carrier. After setting the bearing seat, the bearing seat and the lower cam rotate synchronously. A plane bearing is set between the bearing seat and the geared motor. The switching between motion and stationary is achieved through the two surfaces of the plane bearing, which reduces friction. Ordinary mechanisms use direct friction, while this mechanism uses the rolling of the bearing instead of sliding, which reduces wear and improves service life.

[0037] Furthermore, the bottom of the compression spring 110 is supported on the top surface of the plane bearing 111, and the interior of the lower cam 102 and the outer periphery of the round-headed pin 109 are respectively provided with a first annular surface 113 and a second annular surface 114 that support each other.

[0038] In this embodiment, the round-headed pin is inserted into the hole of the lower cam, and there are annular surfaces between them to support each other. That is, the round-headed pin can be pushed out, but it will not be pushed out excessively.

[0039] Furthermore, the cross-section of the output shaft 105 is D-shaped, and the axis of the lower cam 102 is formed with a D-shaped hole 115 that fits into the output shaft 105.

[0040] In this embodiment, a simple transmission of rotation around the axial direction is achieved through a D-shaped design.

[0041] Furthermore, two upper helical surfaces 106 are arranged in a 180-degree rotational symmetry, and an axial drop surface 116 extending along the axial direction of the upper cam 103 is formed at the connection between the two upper helical surfaces 106.

[0042] In this embodiment, the lower helical surface is also provided, and two round-headed pins are symmetrically arranged, that is, rotating 180 degrees is one shearing action.

[0043] Furthermore, a first support plane 117 is formed on both sides of the upper cam 103, a first outer shell 118 is provided on the outer side of the upper cam 103, and a second support plane 119 is formed on the inner side of the first outer shell 118, which fits and abuts against the first support plane 117 to prevent the upper cam 103 from rotating around the axial direction.

[0044] In this embodiment, the two supporting planes prevent the upper cam from rotating, because the rotation of the upper cam can lead to jamming or other situations that prevent effective shearing. Keeping the upper cam from rotating is a prerequisite for keeping the upper cam moving axially.

[0045] Furthermore, the upper cam 103 has circular holes 120 formed on both sides of the flared mouth 110. A return spring 121 is provided in the circular hole 120. The top of the return spring 121 is supported by the shear bracket 122. The anchor 123 of the shear head 104 is installed on the shear bracket 122.

[0046] In this embodiment, after shearing is completed, the return spring returns the upper cam to its initial position, that is, when the upper and lower cams rotate to the point where the axial drop surfaces intersect. At this time, there is no mutual support between the two, and the return spring directly returns the upper cam to its original position.

[0047] Furthermore, an oil reservoir 124 is formed in the concave shape of the lower helical surface 107.

[0048] In this embodiment, oil storage is achieved, thereby increasing lubrication.

[0049] Furthermore, the first outer shell 118 is installed on the main body shell 125, and the outer side of the first outer shell 118 is fitted with an anti-slip sleeve 126.

[0050] In this embodiment, the friction force when gripping the hand is increased.

[0051] Furthermore, the geared motor 101 is driven by a battery or an external power source.

[0052] In this embodiment, the structure can be equipped with a battery or an external power source, both of which fall within the protection scope of this technology.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0054] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A flexible electric shearing scissors, characterized in that, The device includes a geared motor, a lower cam, an upper cam, and a shearing head arranged sequentially. The output shaft of the geared motor is driven and connected to the axis of the lower cam. The connection between the upper and lower cams has upper and lower helical surfaces that fit together. A helical groove is formed on the upper helical surface. A round-headed pin, which moves axially, is disposed inside the lower cam and protrudes into the helical groove. The depth of the helical groove gradually decreases from near the top surface of the upper cam to its bottom surface. A compression spring is disposed at the end of the round-headed pin away from the helical groove. A flared opening is formed on the top surface of the upper cam to hold the tail of the shearing head. Initially, the round-headed pin does not contact the bottom surface of the spiral groove. When the reduction motor drives the lower cam to rotate, the lower spiral surface rotates, thereby pushing the upper spiral surface to move axially, causing the flared mouth to retract the tail of the shear head, thus achieving shearing. During the shearing process, as the depth of the spiral groove gradually becomes shallower, the round-headed pin contacts and abuts against the spiral groove, and the round-headed pin continues to push the upper cam to move axially, thus continuing to achieve shearing; After shearing is completed, the blade of the shearing head closes, the upper cam can no longer move, and the compression spring under the round-headed pin is compressed, preventing the upper cam from moving excessively and thus preventing the blade of the shearing head from closing excessively.

2. The flexible electric shears according to claim 1, characterized in that, A planar bearing and a bearing housing are also provided between the geared motor and the lower cam. The bottom surface of the planar bearing is fixed to the geared motor, the top surface of the planar bearing is fixed to the bearing housing, and the bottom surface of the lower cam is fixed to the bearing housing.

3. The flexible electric shears according to claim 2, characterized in that, The bottom of the compression spring is supported on the top surface of the planar bearing, and the interior of the lower cam and the outer periphery of the round-headed pin are respectively provided with a first annular surface and a second annular surface that support each other.

4. The flexible electric shears according to claim 1, characterized in that, The output shaft has a D-shaped cross-section, and the lower cam has a D-shaped hole formed on its shaft center that fits into the output shaft.

5. The flexible electric shears according to claim 1, characterized in that, Two upper helical surfaces are arranged symmetrically at 180 degrees, and an axial drop surface extending along the axis of the upper cam is formed at the connection between the two upper helical surfaces.

6. The flexible electric shears according to claim 1, characterized in that, The upper cam has a first support plane formed on both sides, and a first outer shell is provided on the outer side of the upper cam. A second support plane is formed on the inner side of the first outer shell, which fits and abuts against the first support plane to prevent the upper cam from rotating around the axis.

7. The flexible electric shears according to claim 1, characterized in that, The upper cam has circular holes formed on both sides of the horn opening, and a return spring is provided in the circular hole. The top of the return spring is supported by the shear bracket, and the anchor of the shear head is installed on the shear bracket.

8. The flexible electric shears according to claim 1, characterized in that, An oil storage groove is formed concavely on the lower spiral curved surface.

9. The flexible electric shears according to claim 6, characterized in that, The first outer shell is installed on the main body shell, and an anti-slip sleeve is fitted on the outer side of the first outer shell.

10. The flexible electric shears according to claim 1, characterized in that, The geared motor is driven by a battery or an external power source.

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