CN102756174A - Saw blade replacement system - Google Patents
Saw blade replacement system Download PDFInfo
- Publication number
- CN102756174A CN102756174A CN2011101095378A CN201110109537A CN102756174A CN 102756174 A CN102756174 A CN 102756174A CN 2011101095378 A CN2011101095378 A CN 2011101095378A CN 201110109537 A CN201110109537 A CN 201110109537A CN 102756174 A CN102756174 A CN 102756174A
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- reciprocating lever
- saw blade
- push rod
- stop part
- inwall
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Abstract
The invention relates to a saw blade replacement system which comprises a barrel-shaped reciprocating lever. A rotating part is arranged at one longitudinal end of the reciprocating lever and comprises a drive rod inserted into the reciprocating lever, a saw blade is mounted at the other longitudinal end of the reciprocating lever, an ejector rod to be driven by the drive rod to rotate is arranged in the reciprocating lever and comprises a top end with a thread and a tail end with a notch, the notch longitudinally extends from the tail end of the ejector rod to the top end, the top end of the ejector rod is butted against with the saw blade, the drive rod is accommodated in the notch at the tail end of the ejector rod to form drive fit, a thread matching with the thread of the ejector rod is arranged on the inner wall of the reciprocating lever close to a port for mounting the saw blade, a stop part is arranged at one inner end, for mounting a rotary part, of the reciprocating lever, and an elastic force application mechanism is arranged between the stop part and the ejector rod and is used for providing relaxation force between the stop plate and the ejector rod. The service life of the elastic force application mechanism is prolonged while the service life of the whole saw blade replacement system is also prolonged, and reliability is enhanced.
Description
Technical field
The present invention relates to a kind of saw blade and change system.
Background technology
In traditional sweep-saw (jigsaw), the operation principle of saw blade replacing system is as shown in Figure 1.This system comprises the reciprocating lever 5 and the saw blade 6 of semicolumn shaft coupling 1, compression spring 2, terminal screwed push rod 3, hollow.Wherein, shaft coupling 1 and saw blade 6 are installed in the opposite end of reciprocating lever respectively.The bottom of shaft coupling 1 is extended with drive rod 4 downwards; This drive rod 4 stretches in the reciprocating lever 5 (in using the process of saw blade, this reciprocating lever can move back and forth with respect to drive rod 4), and the bottom of drive rod 4 rotates with the top of push rod 3 in being installed in reciprocating lever 5 and cooperates; For example; The mating part of drive rod 4 and push rod 3 is the half round post of fitting each other, when drive rod 4 rotates in reciprocating lever 5, drives push rod 3 and rotates along equidirectional.The longitudinal cross-section of push rod 3 is roughly L shaped; In other words; Push rod 3 comprises the top that is provided with screw thread 31 and the tail end with breach, and to the top orientation longitudinal extension with screw thread, treat to lean with saw blade 6 by the top of push rod 3 from the tail end end of push rod for breach; The breach of the tail end of push rod is accommodated drive rod 4, forms to drive to cooperate.Compression spring 2 is set between the breach bottom surface of the bottom of drive rod 4 and push rod 3.Be provided with the screw thread with the threaded engagement of push rod at reciprocating lever 5 near the inwall of the port that saw blade is installed, make push rod 3 to move along above-below direction longitudinally with respect to reciprocating lever 5, realize compressing and getting loose of saw blade 6 by screw thread.Saw blade 6 stretches in the bottom of expansion of reciprocating lever 5, and its upper end is resisted against in the top of push rod 3.Have mounting groove such as cross bath in the bottom of this reciprocating lever 5, and have the Kato that is used to locate saw blade.In the time of in saw blade is positioned at reciprocating lever 5, saw blade 6 is stuck on the Kato, and push rod 3 compresses the upper end of saw blade 6.
In the time will unclamping saw blade 6, the rotation rotary handle drives shaft coupling 1 rotation, make push rod 3 move up with respect to reciprocating lever 5, thereby push rod 3 no longer compresses saw blade 6, rotates to an angle saw blade 6 for example that 90 degree leave Kato then, from mounting groove, takes out.When fixing saw blade 6, the rotation rotary handle makes push rod 3 move down with respect to reciprocating lever 5, thereby push rod 3 compresses saw blade 6.If in the process of unclamping saw blade 6; The distance that push rod 3 moves up is excessive so that break away under the situation about being threaded fully with reciprocating lever 5; When reinstalling saw blade, compression spring 2 provides axial force to push rod 3, promotes push rod 3 and accurately gets in the screw thread of reciprocating lever 5.
After saw blade was up and down reciprocatingly worked several circulations, compression spring 2 was because of causing fatigue damage repeatedly by compression, and maybe be because of friction and the dynamic load fragmentation from push rod 3 and drive rod 4.These fragments will get in the gap between push rod 3, reciprocating lever 5 and the drive rod 4, thereby stop up whole saw blade clamping system.The worst situation is that the user can not clamp or unclamp saw blade 6.
Summary of the invention
Consider the above-mentioned defective of prior art; The technical problem that the present invention will solve provides a kind of prolongation in service life and the system of saw blade replacing more reliably; It has cancelled the compression spring between drive rod and push rod; But in the upper end of reciprocating lever, stop part is set; And elastic force-applying mechanism is set between stop part and push rod to be guaranteed: even push rod breaks away from from being threaded of reciprocating lever fully, still can be by at an easy rate under the effect of axial force, and easily to the heart be screwed in the matching thread again.
According to the present invention, provide a kind of saw blade to change system, comprise the tubular reciprocating lever; A reciprocating lever end in the vertical is equipped with rotary part; Said rotary part comprises the drive rod that inserts in the reciprocating lever, and the reciprocating lever other end in the vertical is equipped with saw blade, is provided with the push rod of treating by the drive rod driven in rotation in the reciprocating lever; Push rod comprises top that is provided with screw thread and the tail end with breach; To the top orientation longitudinal extension that comprises screw thread, treat to lean with saw blade by the top of push rod from the tail end end of push rod for breach, and the drive rod that the breach of the tail end of push rod is accommodated said rotary part forms to drive and cooperates; Be provided with the screw thread with the threaded engagement of push rod at reciprocating lever near the inwall of the port that saw blade is installed; In an end of reciprocating lever mounting rotating unit, be provided with stop part, include elastic force-applying mechanism between stop part and the push rod, this elastic force-applying mechanism provides the power of the relaxation between stop part and the push rod.This elastic force-applying mechanism is through applying relaxation power between stop part and push rod, can make between the inwall of push rod and reciprocating lever be threaded in disengaging after rebulid, guarantee push rod can be conveniently to the heart be screwed into again in the matching thread of reciprocating lever.This makes being threaded between push rod and the reciprocating lever to make things convenient for all the time and realizes effectively; This elastic force-applying mechanism can be because of not receiving the effect of high frequency dynamic loading simultaneously; So that damage after several operation cycle, or even the extreme failure mode that the stuck whole saw blade of damaged fragment is changed system occurs, thereby the stressing conditions of elastic force-applying mechanism is greatly improved; When improving elastic force-applying mechanism's life-span, prolonged whole saw blade and changed the service life of system and increased reliability.
Preferably, this elastic force-applying mechanism comprises the compression spring, and an end of compression spring is connected with stop part, the tail end end butt of the other end and push rod, and when said saw blade was worked, elastic force-applying mechanism, stop part, push rod and reciprocating lever were static relatively to each other.
Preferably, this elastic force-applying mechanism also comprises pad, and this pad is between the tail end of compression spring and push rod.
Preferably, stop part is the positioning adapter of the tubular that is pressed into from reciprocating lever one end port, and the inwall of this positioning adapter outer wall and reciprocating lever forms interference engagement, and it is simple in structure, be easy to installation.
Preferably, the outer peripheral face of said positioning adapter is formed with circular step portion, and an end of compression spring is enclosed within on the said positioning adapter and is resisted against on this stage portion, to strengthen the steadiness of compression spring.
Preferably, the cross section of said stop part is the T font, an end have treat with an end end face of reciprocating lever against flange, to make things convenient for its installation.
Preferably, said stop part is formed with slit whole on vertically, can regulate its external diameter by this slit, therefore need not control very strict manufacturing tolerance, has reduced manufacturing cost, installs more or less freely simultaneously.
Preferably, said flange is provided with notch, so that installation and removal.
Preferably, said stop part is the elastomer that is arranged on the reciprocating lever inwall.
Preferably; The end that this elastomer and push rod are adjacent is outstanding towards the radially inner side of reciprocating lever; And the opposite other end is embedded in the inwall of reciprocating lever, and under the state of the inwall that whole elastomer is pressed into reciprocating lever, whole elastomeric inwall is concordant with the inwall of reciprocating lever.
Preferably, said elastomer is the elasticity cranse that is stuck on the reciprocating lever inwall, perhaps is a plurality of elastic fins or a plurality of wedge shape elastic rib circumferentially arranged circlewise along the reciprocating lever inwall.
Preferably, said stop part is circumferentially integrally formed cyclic rib or a plurality of spaced apart convexities in the inwall upper edge of reciprocating lever.
Description of drawings
Fig. 1 shows existing saw blade and changes system;
Fig. 2 shows the structural representation that saw blade of the present invention is changed system;
Fig. 2 (a) and 2 (b) are respectively the enlarged drawings of structure among circle A and the B among Fig. 2;
Fig. 3 (a)-(d) shows the structural representation of changing the stop part (positioning adapter) of system according to saw blade of the present invention;
Fig. 4 (a)-(b) shows another structural representation of changing the stop part (elastic fin) of system according to saw blade of the present invention;
Fig. 5 shows the another structural representation of changing the stop part (wedge shape elastic rib) of system according to saw blade of the present invention;
Fig. 6 shows a structural representation again of changing the stop part (cyclic rib) of system according to saw blade of the present invention.
The specific embodiment
Referring now to accompanying drawing embodiments of the invention are described.Hereinafter employed direction " upper and lower " etc. is all set with reference to accompanying drawing.
Fig. 2 shows the structural representation of the system that changes according to saw blade of the present invention.Wherein, represent with identical Reference numeral with the identical or similar parts of existing system shown in Figure 1, and omit its detailed description.Following emphasis is described the difference with existing system shown in Figure 1.
Different with existing system is; Saw blade of the present invention is changed system and between drive rod 4 and push rod 3, has been omitted compression spring 2; The substitute is positioning adapter 7 and the elastic force-applying mechanism of stop part such as tubular is set in the reciprocating lever upper end; This positioning adapter 7 is fixed in the upper end of (such as pressing fit in) reciprocating lever 5, and the inwall of the outer wall of this positioning adapter 7 and reciprocating lever 5 forms interference engagement.The drive rod 4 of shaft coupling 1 passes this positioning adapter 7 and cooperates with push rod 3 rotations.The upper end of the lower end of positioning adapter 7 and push rod 3 is to have said elastic force-applying mechanism between the tail end; This elastic force-applying mechanism can provide tension force to guarantee between positioning adapter 7 and the push rod 3: when changing saw blade; Even push rod 3 is back-outed from the screw thread of reciprocating lever 5 fully; Still can make things convenient for and effectively to the heart be screwed in the matching thread again; The rotation that is easy to through drive rod 4 drives push rod 3, thereby can change saw blade 6 fast, and the fragment that can not occur wearing and tearing is stuck in and causes whole saw blade to change system's stuck failure mode fully between the screw thread on push rod 3 and the reciprocating lever 5.
Preferably, in the present embodiment, shown in Fig. 2 (a) and 2 (b); This elastic force-applying mechanism comprises elastomer such as resin piece; Perhaps compress spring 8, an end of compression spring 8 is connected the tail end end butt of the other end and push rod 3 with the end face near push rod 3 of positioning adapter 7.This elastic force-applying mechanism also can comprise pad 9, and this pad 9 is arranged between the tail end end of the said other end and push rod 3 of compression spring 8, so that the application of force of spring is more even.In addition; In order to increase the steadiness of spring; On the outer peripheral face of positioning adapter 7, form the stage portion 71 (forming stepped at least two sections) of ring-type such as the outer peripheral face that makes positioning adapter 7; One end of compression spring 8 is resisted against on this stage portion 71, and an end of compression spring 8 is enclosed within on the positioning adapter 7, prevent that with this this end that compresses spring 8 breaks away from positioning adapter 7.This stage portion can form the part of positioning adapter 7.
Specifically describe the replacing process of saw blade 6 below.
In the time existing saw blade will being changed, at first need unclamp saw blade 6.Make 1 rotation of semicolumn shaft coupling through rotary handle; And then make drive rod 4 drive push rod 3 rotations; Push rod 3 moves up through the longitudinal axis of screw thread along reciprocating lever 5 in rotary course, screws out the screw thread that meshes with reciprocating lever 5 gradually, can rotate freely up to saw blade 6.Can rotate to an angle saw blade 6 this moment leaves the Kato of reciprocating lever 5 lower ends, can saw blade 6 be taken off.In this back-out process, compression spring 8 is compressed, and positioning adapter 7 and push rod 3 are applied a continuous power that increases, and when push rod 3 screwed out from the screw thread of reciprocating lever 5 fully, this power reached a limiting value.Afterwards, new saw blade 6 is inserted in the bottom of reciprocating levers 5, and saw blade rotated to an angle make on its Kato that snaps into reciprocating lever 5 lower ends; Use 1 rotation of rotary handle reverse drive shaft coupling this moment; Thereby drive rod 4 drives push rods 3 rotations, even because this positioning adapter 7 and elastic force-applying mechanism can guarantee that the screw thread of push rod 3 and reciprocating lever 5 breaks away from fully in unclamping the process of saw blade, push rod 3 still can be under the effect of the axial elastic force of compression spring 8; Convenient and effectively to the heart be screwed in the matching thread again; Therefore, the user is just easily in the screw thread with push rod 3 precession reciprocating levers 5, thereby clamps saw blade 6.
When saw blade 2 work, compression spring 8 moves reciprocatingly with reciprocating lever 5.Do not bear friction and dynamic load that compression spring 2 of the prior art is born, therefore, the compression spring 8 among the present invention can not produce fragment because of fatigue is impaired, thereby destroys whole system.And compare with existing systems; Positioning adapter 7, compression spring 8, pad 9 and reciprocating lever 5 and push rod 3 form a system in the process that moves up and down, between them, can not produce relative motion, also are; When saw blade is worked; They are static relatively to each other, and compression spring 8 only bears small dead load, have eliminated serious dynamic and friction load.Therefore, with regard to stress state and reliability, system of the present invention has obtained better effect.
In the present embodiment, shown in Fig. 3 (a), positioning adapter 7 is cylindric, and this shape requires strictness to the external diameter of positioning adapter 7, because need make the inwall compression fit of its outer wall and reciprocating lever, to guarantee that positioning adapter 7 is fixed in the reciprocating lever 5.Positioning adapter 7 also can be the shape shown in Fig. 3 (b), 3 (c) and 3 (d).Positioning adapter 7 shown in Fig. 3 (b) is formed with slit (elongated open) whole on vertically; In this case, lining can be regulated its external diameter by this slit, therefore need not control very strict manufacturing tolerance; Reduced manufacturing cost, installed more or less freely simultaneously.The longitudinal section of the positioning adapter 7 shown in Fig. 3 (c) is the T font, and an end of positioning adapter 7 has flange, this flange bottom surface around and against the upper surface of reciprocating lever 5, make things convenient for the installation and the location of lining with this.This flange can pass through method manufacturings such as casting, extrusion molding.Positioning adapter shown in Fig. 3 (d) is being for forming slit whole on vertically with Fig. 3 (b) on the basis of Fig. 3 (c) similarly, and, some notches can also be set on end flange, make things convenient for installing and locating lining or dismounting to keep in repair.
Need to prove that in addition rotation between drive rod 4 and the push rod 3 cooperates also can adopt other structure, such as between the two through keyway cooperate, shackle cooperates, is clasped etc.Drive rod 4 also is not limited to half round post with the part that push rod 3 is fitted to each other, and drives push rod 3 rotations as long as can realize drive rod 4.
In addition, the rotary part that can drive push rod 3 rotations is not limited to shaft coupling 1 and semicolumn drive rod 4, so long as can its rotation be got final product to push rod 3 application of forces, and such as the power transmission shaft that adopts in the conventional means.
Alternatively; Stop part also can be arranged on the elastomer on the inwall of reciprocating lever 5; Such as the elasticity cranse on the inwall that is stuck in reciprocating lever 5, perhaps several are along the elastic fin that circumferentially circularizes layout 71 of reciprocating lever 5 inwalls, shown in Fig. 4 (a), 4 (b); This elastic fin 71 can embed from reciprocating lever 5 upper ends and be fixed on its inwall, and is tilted at angle with the reciprocating lever inwall and extends below.When inserting push rod 3, pad 9 and compression spring 8, the end of this elastic fin is pressed towards the inwall of reciprocating lever.And after inserting push rod 3, pad 9 and compression spring 8, the lower end of this elastic fin is by means of the inside perk of self elastic force, thereby this elastic fin is withstood in the upper end of compression spring 8.
Equally, this elastomer also can be other parts that can form similar functions, such as; Be arranged on several wedge shape elastic ribs 72 that the edge on reciprocating lever 5 inwalls is circumferentially arranged circlewise, as shown in Figure 5, the lower end of this wedge shape elastic rib is outstanding towards the central axis of reciprocating lever 5 from the inwall of reciprocating lever 5; And the other end is embedded in the inwall of reciprocating lever 5; When inserting push rod 3, pad 9 and compression spring 8, its compressing wedge shape elastic rib, and insert in the reciprocating lever 5.And push rod 3, pad 9 and compression spring 8 get into after the reciprocating lever 5 fully, and the lower end of this wedge shape elastic rib is by means of the inside perk of self elastic force, thereby this wedge shape elastic rib is withstood in the upper end of compression spring 8.
Above-mentioned several elastic fins can form as one, such as, fuse at an end of above-mentioned a plurality of elastic fins.Equally, above-mentioned several wedge shape elastic ribs also can form as one.
Also preferably; After inserting push rod 3, pad 9 and compression spring 8 in the reciprocating lever 5; At inside extrusion molding one cyclic rib 73 in appropriate location of the periphery of reciprocating lever 5, as shown in Figure 6, also be; The inwall of this cyclic rib and reciprocating lever 5 is formed as one, and push up on this cyclic rib the upper end of compression spring 8.This kind structure is simpler, is easy to realize.Said cyclic rib also can be the circumferential spaced apart convexities in a plurality of edges.
To those skilled in the art, other advantage and modification are conspicuous.Therefore shown in the present invention is not limited to regard to its more wide in range meaning with described detail, representative configurations and illustrative examples.
Claims (10)
1. a saw blade is changed system, comprises tubular reciprocating lever (5), and reciprocating lever (a 5) end in the vertical is equipped with rotary part; Said rotary part comprises the drive rod (4) that inserts in the reciprocating lever, and reciprocating lever (5) other end in the vertical is equipped with saw blade (6), is provided with the push rod of treating by drive rod (4) driven in rotation (3) in the reciprocating lever (5); Push rod comprises top that is provided with screw thread and the tail end with breach; To the top orientation longitudinal extension that comprises screw thread, treat to lean with saw blade (6) by the top of push rod from the tail end end of push rod for breach, and the breach of the tail end of push rod is accommodated the drive rod of said rotary part (4); Form to drive and cooperate; Be provided with the screw thread with the threaded engagement of push rod at reciprocating lever (5) near the inwall of the port that saw blade is installed, it is characterized in that, in an end of reciprocating lever mounting rotating unit, be provided with stop part (7); Include elastic force-applying mechanism between stop part (7) and the push rod (3), this elastic force-applying mechanism provides the power of the relaxation between stop part and the push rod.
2. saw blade according to claim 1 is changed system; It is characterized in that; This elastic force-applying mechanism comprises compression spring (8), and an end of compression spring is connected the tail end end butt of the other end and push rod (3) with stop part (7); When said saw blade was worked, elastic force-applying mechanism, stop part (7), push rod (3) and reciprocating lever were static relatively to each other.
3. saw blade according to claim 2 is changed system, it is characterized in that this elastic force-applying mechanism also comprises pad (9), and this pad is positioned between the tail end of compression spring and push rod (3).
4. change system according to each described saw blade of claim 1-3, it is characterized in that, said stop part (7) is the positioning adapter of the tubular that is pressed into from reciprocating lever (5) one end ports, the inwall formation interference engagement of this positioning adapter outer wall and reciprocating lever.
5. saw blade according to claim 4 is changed system, it is characterized in that the outer peripheral face of said positioning adapter is formed with circular step portion, and an end of compression spring is enclosed within on the said positioning adapter and is resisted against on this stage portion.
6. change system according to claim 4 or 5 described saw blades, it is characterized in that the cross section of said stop part (7) is the T font, an end have treat with an end end face of reciprocating lever (5) against flange.
7. change system according to each described saw blade of claim 4-6, it is characterized in that, said stop part (7) is formed with slit whole on vertically.
8. change system according to each described saw blade of claim 1-3, it is characterized in that, stop part (7) is for being arranged on the elastomer on reciprocating lever (5) inwall.
9. saw blade according to claim 8 is changed system, it is characterized in that said elastomer is the elasticity cranse that is stuck on the reciprocating lever inwall, perhaps is a plurality of elastic fins or a plurality of wedge shape elastic rib circumferentially arranged circlewise along the reciprocating lever inwall.
10. change system according to each described saw blade of claim 1-3, it is characterized in that, said stop part (7) is circumferentially integrally formed cyclic rib (73) or a plurality of spaced apart convexities in the inwall upper edge of reciprocating lever (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101095378A CN102756174A (en) | 2011-04-25 | 2011-04-25 | Saw blade replacement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101095378A CN102756174A (en) | 2011-04-25 | 2011-04-25 | Saw blade replacement system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102756174A true CN102756174A (en) | 2012-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101095378A Pending CN102756174A (en) | 2011-04-25 | 2011-04-25 | Saw blade replacement system |
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| CN (1) | CN102756174A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102962517A (en) * | 2012-11-27 | 2013-03-13 | 凯迈(洛阳)机电有限公司 | Saw bow free from dismounting and displacing and saw blade connecting gripping heads thereof |
-
2011
- 2011-04-25 CN CN2011101095378A patent/CN102756174A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102962517A (en) * | 2012-11-27 | 2013-03-13 | 凯迈(洛阳)机电有限公司 | Saw bow free from dismounting and displacing and saw blade connecting gripping heads thereof |
| CN102962517B (en) * | 2012-11-27 | 2015-01-28 | 凯迈(洛阳)机电有限公司 | Saw bow free from dismounting and displacing and saw blade connecting gripping heads thereof |
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Application publication date: 20121031 |