Needle winding mechanism

Abstract

The present invention discloses a needle winding mechanism, which comprises a first needle winding fixed block, a second needle winding fixed block, a first needle winding, a second needle winding and a sleeve, wherein the first needle winding is connected to the first needle winding fixed block, and the second needle winding is connected to the second needle winding fixed block; the sleeve is sleeved on the outside of the first needle winding fixed block and the second needle winding fixed block; wherein the first needle winding and the second needle winding are both in a semicircular arc thin-walled shape, and an extrusion assembly is provided on the sleeve, which is used to squeeze the first needle winding and the second needle winding, so that the diameter of the cylinder formed by the first needle winding and the second needle winding is reduced, so that the needle winding mechanism can be separated from the winding core wound on the first needle winding and the second needle winding. The present invention can make the needle winding mechanism separate from the winding core wound on the first needle winding and the second needle winding without taking away or wrinkling the inner winding material of the winding core, thereby ensuring the quality of the capacitor or the battery core.

Description

Technical Field

[0001] The invention relates to the technical field of automation equipment, and in particular to a needle rolling mechanism. Background Art

[0002] In the process of preparing the winding core of a capacitor or battery, a winding needle mechanism is generally used to wind the winding material to form the winding core of the capacitor or battery. After the winding of the core is completed, the core needs to be removed from the winding needle mechanism so that the winding needle mechanism can continue to wind the next core.

[0003] The inventors of the present application discovered during long-term research and development that since the inner diameter of the winding core is equal to the outer diameter of the winding needle in the winding needle mechanism, the inner winding material of the winding core is easily carried away or wrinkled by the winding needle mechanism during the process of removing the winding core from the winding needle mechanism, which directly affects the quality of the capacitor or battery cell. Summary of the invention

[0004] The present invention provides a winding needle mechanism to solve the technical problem in the prior art that the inner winding material of the winding core is easily taken away or wrinkled during the process of removing the winding core from the winding needle mechanism.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a needle winding mechanism, comprising:

[0006] a first needle winding fixing block and a second needle winding fixing block;

[0007] a first winding needle and a second winding needle, wherein the first winding needle is connected to the first winding needle fixing block, and the second winding needle is connected to the second winding needle fixing block;

[0008] A sleeve, sleeved on the outer sides of the first needle winding fixing block and the second needle winding fixing block;

[0009] Among them, the first winding needle and the second winding needle are both semi-circular thin-walled, and the sleeve is provided with an extrusion assembly for squeezing the first winding needle and the second winding needle so that the diameter of the cylinder formed by the first winding needle and the second winding needle is reduced, so that the winding needle mechanism can be separated from the winding core wound around the first winding needle and the second winding needle.

[0010] In a specific embodiment, a first separation groove is formed between the first winding needle and the second winding needle.

[0011] In a specific embodiment, a rolling groove extending along the axial direction of the sleeve is provided on the outer side wall of the first winding needle and the second winding needle, and the extrusion assembly includes a roller, and the roller can roll in the rolling groove to squeeze the first winding needle and the second winding needle toward the axial direction of the sleeve.

[0012] In a specific embodiment, the depth of the rolling groove in the radial direction of the sleeve gradually decreases along the rolling direction of the roller away from the first winding needle fixing block.

[0013] In a specific embodiment, at least one second separation groove extending along the axial direction of the sleeve is respectively provided on the first winding needle and the second winding needle, so as to reserve deformation space for the first winding needle and the second winding needle.

[0014] In a specific embodiment, at least one deformation groove extending along the circumferential direction of the sleeve is respectively provided on the first winding needle and the second winding needle, and the deformation groove is connected to the second dividing groove to reserve deformation space for the first winding needle and the second winding needle.

[0015] In a specific embodiment, at least one empty slot extending along the axial direction of the sleeve is respectively provided on the first winding needle and the second winding needle.

[0016] In a specific embodiment, the winding needle mechanism further includes a first pressing block and a second pressing block, wherein the first pressing block is used to press and fix the first winding needle on the first winding needle fixing block, and the second pressing block is used to press and fix the second winding needle on the second winding needle fixing block.

[0017] In a specific embodiment, a limiting groove is provided on the outer side wall of the first winding needle fixing block and / or the second winding needle fixing block, and a limiting block is provided on the sleeve. The limiting groove and the limiting block cooperate to realize the limiting of the first winding needle fixing block and the second winding needle fixing block relative to the sleeve along the circumferential direction of the sleeve, and the limiting block can slide in the limiting groove along the axial direction of the sleeve.

[0018] In a specific embodiment, the needle winding mechanism further includes a first driving mechanism and a second driving mechanism, the first driving mechanism is connected to the first needle winding fixing block, and is used to drive the first needle winding fixing block along the axial direction of the sleeve, and the second driving mechanism is connected to the second needle winding fixing block, and is used to drive the second needle winding fixing block along the axial direction of the sleeve.

[0019] In a specific embodiment, the needle winding mechanism further includes a third driving mechanism, which is connected to the sleeve and is used to drive the sleeve, the first needle winding fixing block, the second needle winding fixing block, the first needle winding and the second needle winding to rotate around the axis of the sleeve together. The first needle winding fixing block is provided with a first connecting head at the end away from the first needle winding, and the first driving mechanism includes a first driving roller, which abuts against the first connecting head; the second needle winding fixing block is provided with a second connecting head at the end away from the second needle winding, and the second connecting head is located on the side of the first connecting head away from the first needle winding, and the second driving mechanism includes a second driving roller, which abuts against the second connecting head.

[0020] In a specific embodiment, the second connecting head is rotatably connected to the second needle winding fixing block, and the needle winding mechanism further includes an abutment block, which abuts against the second connecting head so that when the second needle winding fixing block rotates around the axis of the sleeve, the second connecting head and the abutment block are relatively stationary.

[0021] The present invention arranges a sleeve outside the first winding needle and the second winding needle of the winding needle mechanism, and arranges an extrusion component on the sleeve. After the winding material of the winding core is wound, the first winding needle and the second winding needle can be squeezed to reduce the diameter of the cylinder formed by the first winding needle and the second winding needle, so that the winding needle mechanism can be separated from the winding core wound on the first winding needle and the second winding needle, and the inner winding material of the winding core will not be taken away or wrinkled, thereby ensuring the quality of the capacitor or the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0023] Figure 1 It is a structural schematic diagram of an embodiment of a needle winding mechanism of the present invention;

[0024] Figure 2 It is a structural schematic diagram of a first needle winding fixing block, a second needle winding fixing block, a first needle winding and a second needle winding in one embodiment of the needle winding mechanism of the present invention;

[0025] Figure 3 It is a structural schematic diagram of an extrusion assembly in an embodiment of a needle rolling mechanism of the present invention;

[0026] Figure 4It is a structural schematic diagram of the first winding needle in an embodiment of the winding needle mechanism of the present invention;

[0027] Figure 5 It is a structural schematic diagram of the first winding needle in an embodiment of the winding needle mechanism of the present invention;

[0028] Figure 6 It is a structural schematic diagram of the first winding needle in an embodiment of the winding needle mechanism of the present invention;

[0029] Figure 7 It is a structural schematic diagram of the first winding needle in an embodiment of the winding needle mechanism of the present invention;

[0030] Figure 8 It is a schematic structural diagram of the second winding needle in an embodiment of the winding needle mechanism of the present invention;

[0031] Fig. 9 It is a schematic structural diagram of the second winding needle in an embodiment of the winding needle mechanism of the present invention;

[0032] Fig.10 It is a structural schematic diagram of another embodiment of the needle winding mechanism of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The terms "first" and "second" in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices. The term "and / or" is only a kind of association relationship describing associated objects, indicating that three relationships can exist, for example, A and / or B can be represented: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are a kind of "or" relationship.

[0035] See also Figure 1 and Figure 2The embodiment of the needle winding mechanism 10 of the present invention comprises a first needle winding fixing block 100, a second needle winding fixing block 200, a first needle winding 300, a second needle winding 400 and a sleeve 500, wherein the first needle winding 300 is connected to the first needle winding fixing block 100, and the second needle winding 400 is connected to the second needle winding fixing block 200; the sleeve 500 is sleeved on the outer sides of the first needle winding fixing block 100 and the second needle winding fixing block 200; wherein the first needle winding 300 and the second needle winding 400 are both semicircular thin-walled, and an extrusion assembly 510 is provided on the sleeve 500 for extruding the first needle winding 300 and the second needle winding 400 so as to reduce the diameter of the cylinder formed by the first needle winding 300 and the second needle winding 400, thereby enabling the needle winding mechanism 10 to be separated from the winding core (not shown in the figure) wound around the first needle winding 300 and the second needle winding 400.

[0036] The embodiment of the present invention arranges a sleeve 500 outside the first winding needle 300 and the second winding needle 400 of the winding needle mechanism 10, and provides an extrusion assembly 510 on the sleeve 500. After the winding material of the core is wound, the first winding needle 300 and the second winding needle 400 can be squeezed to reduce the diameter of the cylinder formed by the first winding needle 300 and the second winding needle 400, so that the winding needle mechanism 10 can be separated from the core wound on the first winding needle 300 and the second winding needle 400, and the inner winding material of the core will not be taken away or wrinkled, thereby ensuring the quality of the capacitor or battery cell.

[0037] In this embodiment, a first dividing groove 310 is formed between the first winding needle 300 and the second winding needle 400 to reserve an accommodating space for the winding material and to reserve a deformation space for the first winding needle 300 and the second winding needle 400 .

[0038] See also Figure 3 A rolling groove 320 extending along the axial direction of the sleeve 500 is provided on the outer wall of the first winding needle 300. The extrusion assembly 510 includes a roller 511 and a roller fixing seat 512. The roller fixing seat 512 is fixedly arranged at one end of the sleeve 500 close to the first winding needle 300. The roller 511 is rotatably arranged on the roller fixing seat 512. The roller 511 can roll in the rolling groove 320 to squeeze the first winding needle 300 toward the axial direction close to the sleeve 500.

[0039] See also Figure 4 and Figure 5 , Figure 4 It is a schematic diagram of the structure before the roller 511 squeezes the first winding needle 300. Figure 5 It is a schematic diagram of the structure after the roller 511 squeezes the first winding needle 300. In this embodiment, the depth of the rolling groove 320 along the radial direction of the sleeve 500 gradually decreases along the rolling direction of the roller 511 away from the first winding needle fixing block 100.

[0040] Specifically, when the first winding needle fixing block 100 moves along the axial direction of the sleeve 500 away from the roller 511, the first winding needle 300 moves accordingly, so that the roller 511 acts on the rolling groove 320 to squeeze the first winding needle 300 axially toward the sleeve 500, and the squeezing force gradually increases.

[0041] In this embodiment, a rolling groove 410 extending along the axial direction of the sleeve 500 is provided on the outer wall of the second winding needle 400, wherein the structure of the rolling groove 410 is similar to the rolling groove 320 of the first winding needle 300 mentioned above, and the roller 511 can also act on the rolling groove 410 to squeeze the second winding needle 400 axially toward the sleeve 500, which will not be repeated here.

[0042] See also Figure 6 and Figure 7 In this embodiment, at least one set of second dividing grooves 330 extending along the axial direction of the sleeve 500 and deformation grooves 340 extending along the circumferential direction of the sleeve 500 are respectively provided on the first winding needle 300. The second dividing grooves 330 are connected to the deformation grooves 340 to reserve deformation space for the first winding needle 300.

[0043] In other embodiments, two or three groups of second separation grooves 330 and deformation grooves 340 may be provided on the first winding needle 300 , which is not limited here.

[0044] In this embodiment, at least one hollow groove 350 can be further provided on the first winding needle 300. The hollow groove 350 extends along the axial direction of the sleeve 500. The hollow groove 350 can retain a certain amount of air between the winding material and the first winding needle 300 after the winding material is wound on the first winding needle 300, thereby avoiding the formation of a vacuum state between the winding material and the first winding needle 300. At the same time, the hollow groove 350 can also reduce the contact area between the winding material and the first winding needle 300, which is conducive to separating the winding material from the first winding needle 300.

[0045] In this embodiment, the needle winding mechanism 10 further includes a first pressing block 130, which is used to press and fix the first needle winding 300 on the first needle winding fixing block 100. Since the first fixing block 100 is semi-cylindrical, the first needle winding 300 can be limited by providing the first pressing block 130, so that the first needle winding 300 cannot rotate relative to the first needle winding fixing block 100.

[0046] In this embodiment, a weight reduction cavity 140 may be further provided on the first needle winding fixing block 100, so as to reduce the weight of the first needle winding fixing block 100, reduce the rotational inertia, and increase the rotational speed.

[0047] See also Figure 8 and Fig. 9In this embodiment, a second dividing groove 420, a deformation groove 430 and a hollow groove 440 are provided on the second winding needle 400, wherein the structures of the second dividing groove 420 and the deformation groove 430 are similar to the second dividing groove 330 and the deformation groove 340 of the first winding needle 300, and the structure of the hollow groove 440 is similar to the hollow groove 350 of the first winding needle 300, which will not be repeated here.

[0048] In this embodiment, the needle winding mechanism 10 further includes a second pressing block 230, which is used to press and fix the second needle winding 400 on the second needle winding fixing block 200. The structure of the second pressing block 230 is similar to that of the first pressing block 130, which will not be repeated here.

[0049] In this embodiment, a weight reduction cavity 220 may be further provided on the second needle winding fixing block 200, so as to reduce the weight of the second needle winding fixing block 200, reduce the rotational inertia, and increase the rotational speed.

[0050] See also Figure 1 and Figure 2 In this embodiment, a limiting groove 110 is provided on the outer wall of the first needle winding fixing block 100, and a limiting block 520 is provided on the sleeve 500. The limiting groove 110 and the limiting block 520 cooperate to realize the limiting of the first needle winding fixing block 100 and the second needle winding fixing block 200 relative to the sleeve 500 along the circumferential direction of the sleeve 500, and the limiting block 520 can slide in the limiting groove 110 along the axial direction of the sleeve 500, so that the first needle winding fixing block 100, the second needle winding fixing block 20 and the sleeve 500 can rotate synchronously around the axis of the sleeve 500.

[0051] In other embodiments, the limiting groove may also be provided on the outer wall of the second needle winding fixing block 200, or may be provided on the outer walls of the first needle winding fixing block 100 and the second needle winding fixing block 200 at the same time, which is not limited here.

[0052] In this embodiment, the needle winding mechanism 10 further includes a first driving mechanism 600 and a second driving mechanism 700. The first driving mechanism 600 is connected to the first needle winding fixing block 100 and is used to drive the first needle winding fixing block 100 in the axial direction of the sleeve 500. The second driving mechanism 700 is connected to the second needle winding fixing block 200 and is used to drive the second needle winding fixing block 200 in the axial direction of the sleeve 500.

[0053] In this embodiment, the needle winding mechanism 10 further includes a third driving mechanism (not shown in the figure), which is connected to the sleeve 500 and is used to drive the sleeve 500, the first needle winding fixing block 100, the second needle winding fixing block 200, the first needle winding 300 and the second needle winding 400 to rotate around the axis of the sleeve 500.

[0054] In this embodiment, the third driving mechanism may include two synchronous wheels, a synchronous belt and a driving assembly, the two synchronous wheels are respectively sleeved on the sleeve 500 and the driving end of the driving assembly, the synchronous belt is sleeved on the two synchronous wheels, and the driving assembly drives the synchronous wheels to drive the sleeve 500 to rotate, thereby winding the winding material. In other embodiments, the third driving mechanism may also be other mechanisms that can rotate the sleeve 500, which is not limited here.

[0055] In this embodiment, a first connecting head 120 is provided at one end of the first winding needle fixing block 100 away from the first winding needle 300, and a first groove 121 is provided on the circumference of the first connecting head 120. The first driving mechanism 600 includes a first driving component 610 and a first driving roller 620. The first driving roller 620 is connected to the first driving component 610 and can rotate relative to the first driving component 610. The first driving roller 620 is accommodated in the first groove 121 to abut against the first connecting head 120, so that when the first winding needle fixing block 100 rotates around the axial direction of the sleeve 500, the first driving roller 620 can slide in the first groove 121.

[0056] See also Figure 8 and Fig. 9 In the present embodiment, a second connector 210 is provided at one end of the second winding needle fixing block 200 away from the second winding needle 400, and the second connector 210 is located on a side of the first connector 120 away from the first winding needle 300, and a second groove 211 is provided on the circumference of the second connector 210, and the second driving mechanism 700 includes a second driving component 710 and a second driving roller 720, the second driving roller 720 is connected to the second driving component 710 and can rotate relative to the second driving component 710, and the second driving roller 720 is accommodated in the second groove 211 to abut against the second connector 210, so that when the second winding needle fixing block 200 rotates around the axial direction of the sleeve 500, the second driving roller 720 can slide in the second groove 211.

[0057] See also Fig.10 In other embodiments, the second connecting head 210 can be provided with a flange 212, and the second driving mechanism can be provided with a third driving roller 730 and a fourth driving roller 740. The flange 212 is clamped between the third driving roller 730 and the fourth driving roller 740, so that when the second winding needle fixing block 200 rotates around the axial direction of the sleeve 500, the third driving roller 730 and the fourth driving roller 740 can slide on the two end surfaces of the flange 212.

[0058] See also Figure 1 , Figure 8 and Fig. 9In this embodiment, the second connector 210 is rotatably connected to the second winding needle fixing block 200, and the winding needle mechanism 10 further includes an abutment block (not shown in the figure), which abuts against the second connector 210, so that when the second winding needle fixing block 200 rotates around the axis of the sleeve 500, the second connector 210 and the abutment block are relatively stationary. The abutment block can be provided to prevent the second winding needle fixing block 200 from moving away from the sleeve 500 during the rotation process around the sleeve 500, thereby affecting the normal winding process of the winding material.

[0059] Specifically, before winding, the first driving mechanism 600 drives the first winding needle fixing block 100 along the axial direction of the sleeve 500 toward the direction approaching the sleeve 500, so that the first winding needle 300 extends out of the sleeve 500, and then the winding material is attached to the outer surface of the first winding needle 300; the second driving mechanism 700 then drives the second winding needle fixing block 200 along the axial direction of the sleeve 500 toward the direction approaching the sleeve 500, so that the second winding needle 400 extends out of the sleeve 500, and the winding material is clamped between the first winding needle 300 and the second winding needle 400, that is, it passes through the first dividing groove 310 and further extends to the outer surface of the first winding needle 300 or the second winding needle 400.

[0060] The third driving mechanism is turned on to drive the sleeve 500 to rotate and start winding.

[0061] After the winding is completed, the first driving mechanism 600 and the second driving mechanism 700 respectively drive the first winding needle fixing block 100 and the second winding needle fixing block 200 along the axial direction of the sleeve 500 in the direction away from the sleeve 500, so that the cylinder formed by the first winding needle 300 and the second winding needle 400 is reduced in diameter under the action of the extrusion assembly 510, thereby gradually separating from the winding core after the winding is completed, and finally completing the preparation of the winding core, and making the inner winding material of the winding core intact, thereby ensuring the quality of the capacitor or battery cell.

[0062] The above description is only an implementation mode of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A needle winding mechanism, characterized in that: include: a first needle winding fixing block and a second needle winding fixing block; a first winding needle and a second winding needle, wherein the first winding needle is connected to the first winding needle fixing block, and the second winding needle is connected to the second winding needle fixing block; A sleeve, sleeved on the outer sides of the first winding needle fixing block and the second winding needle fixing block; Wherein, the first winding needle and the second winding needle are both in a semicircular thin-walled shape, and a pressing assembly is provided on the sleeve. When the first winding needle and the second winding needle move relative to the sleeve along the axial direction of the sleeve, the pressing assembly slides on the first winding needle and the second winding needle and presses the first winding needle and the second winding needle, so that the diameter of the cylinder formed by the first winding needle and the second winding needle is reduced, so that the winding needle mechanism can be separated from the winding core wound around the first winding needle and the second winding needle; The outer side walls of the first winding needle and the second winding needle are provided with rolling grooves extending along the axial direction of the sleeve, and the extrusion assembly includes a roller, which can roll in the rolling groove to squeeze the first winding needle and the second winding needle toward the axial direction of the sleeve; Wherein, the needle winding mechanism further includes a first driving mechanism, and the first driving mechanism is connected to the first needle winding fixing block and is used to drive the first needle winding fixing block in the axial direction of the sleeve.

2. The needle winding mechanism according to claim 1, characterized in that: A first separation groove is formed between the first winding needle and the second winding needle.

3. The needle winding mechanism according to claim 1, characterized in that: The depth of the rolling groove in the radial direction of the sleeve gradually decreases along the rolling direction of the roller away from the first winding needle fixing block.

4. The needle winding mechanism according to claim 2, characterized in that: The first winding needle and the second winding needle are respectively provided with at least one second dividing groove extending along the axial direction of the sleeve, which is used to reserve deformation space for the first winding needle and the second winding needle.

5. The needle winding mechanism according to claim 4, characterized in that: The first winding needle and the second winding needle are respectively provided with at least one deformation groove extending along the circumferential direction of the sleeve, and the deformation groove is communicated with the second dividing groove to reserve deformation space for the first winding needle and the second winding needle.

6. The needle winding mechanism according to claim 1, characterized in that: The first winding needle and the second winding needle are respectively provided with at least one empty groove extending along the axial direction of the sleeve.

7. The needle winding mechanism according to claim 1, characterized in that: The needle winding mechanism further includes a first pressing block and a second pressing block, wherein the first pressing block is used to press and fix the first needle winding on the first needle winding fixing block, and the second pressing block is used to press and fix the second needle winding on the second needle winding fixing block.

8. The needle winding mechanism according to claim 1, characterized in that: A limiting groove is provided on the outer side wall of the first winding needle fixing block and / or the second winding needle fixing block, and a limiting block is provided on the sleeve. The limiting groove and the limiting block cooperate to realize the limiting of the first winding needle fixing block and the second winding needle fixing block relative to the sleeve along the circumferential direction of the sleeve, and the limiting block can slide in the limiting groove along the axial direction of the sleeve.

9. The needle winding mechanism according to claim 1, characterized in that: The needle winding mechanism further comprises a second driving mechanism, which is connected to the second needle winding fixing block and is used to drive the second needle winding fixing block in the axial direction of the sleeve.

10. The needle winding mechanism according to claim 9, characterized in that: The needle winding mechanism further includes a third driving mechanism, which is connected to the sleeve and is used to drive the sleeve, the first needle winding fixing block, the second needle winding fixing block, the first needle winding and the second needle winding to rotate around the axis of the sleeve together. The first needle winding fixing block is provided with a first connecting head at the end away from the first needle winding, and the first driving mechanism includes a first driving roller, and the first driving roller abuts against the first connecting head; the second needle winding fixing block is provided with a second connecting head at the end away from the second needle winding, and the second connecting head is located on the side of the first connecting head away from the first needle winding, and the second driving mechanism includes a second driving roller, and the second driving roller abuts against the second connecting head.

11. The needle winding mechanism according to claim 10, characterized in that: The second connecting head is rotatably connected to the second needle winding fixing block, and the needle winding mechanism further includes an abutment block, which abuts against the second connecting head so that when the second needle winding fixing block rotates around the axis of the sleeve, the second connecting head and the abutment block are relatively stationary.

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