Needle installation platform for installing yarn guide needles of warp knitting machine

Abstract

The present invention belongs to the technical field of warp knitting machine installation, specifically a needle loading platform for installing yarn guide needles of warp knitting machines, comprising a needle loading platform base; multiple groups of supporting feet are fixedly connected to the bottom of the needle loading platform base; the supporting feet include columns; the columns are fixed to the needle loading platform base; an adjusting screw is installed at the bottom of the column; a pad is fixedly connected to the bottom end of the adjusting screw; a pointer is provided in the middle of the adjusting screw; a ruler is installed on the needle loading platform base; a groove needle bed is installed on the top of the needle loading platform base; multiple groups of needle pads are installed between the needle loading platform base and the groove needle bed; several wall panels are fixed to the side walls of the needle loading platform base; a swing shaft is installed in the middle of the wall panel; multiple groups of swing arms are installed in the middle of the swing shaft; a hanger seat bed is installed at the end of the swing arm. The present invention adopts the method of ensuring the quality of needle loading by quantitatively adjusting the needle loading platform adjustment screw according to the bending condition of the warp knitting machine bed.

Description

Technical Field

[0001] The invention belongs to the technical field of warp knitting machine installation, in particular to a needle mounting platform for mounting yarn guide needles of a warp knitting machine. Background Art

[0002] Warp knitting machines weave by moving multiple groups of needles in a certain pattern; each group of needles is installed on the needle bed and distributed along the longitudinal direction of the machine; the density of each group of needles must be strictly the same or an integer multiple.

[0003] For the groove needles and guide needles, the groove needles are generally installed first, positioned with the needle grooves on the groove needle bed, and then the guide needles are installed with the groove needles as the reference (the guide needles have been combined into needle blocks); the basic requirement is that the guide needles and the groove needles are aligned and aligned.

[0004] However, the workload of installing the yarn guide needle is large and varies with different machine models. If the assembly of the warp knitting machine adopts the assembly line operation mode, more space and time need to be reserved.

[0005] This solves the following two problems:

[0006] 1. Install the yarn guide needle on the needle loading table and ensure that the yarn guide needle and the groove needle are aligned. After transferring to the warp knitting machine body, the yarn guide needle and the groove needle are still aligned.

[0007] After changing the installation environment and installation foundation, there are two factors that affect the alignment of the yarn guide needle and the groove needle:

[0008] 1) Ambient temperature

[0009] The width of today's mainstream warp knitting machines approaches 10m, while the distance between adjacent needles is often less than 0.7mm. Consequently, even a small amount of relative expansion can accumulate to a significant degree over the entire length. This necessitates strict limits on temperature-related changes in the base length of the needle loading platform.

[0010] Current technology generally uses air conditioners to control the ambient temperature, but due to the complex environment of the needle installation site and the unpredictable opening of doors and windows, the control effect is not very good.

[0011] 2) Straightness of the needle mounting table

[0012] The groove needles and the corresponding yarn guide needles must have the same density in the left-right direction and the same spacing in the top-bottom direction. This can be simulated using two combs with their needles facing each other.

[0013] As the instruction manual Figure 1 As shown in the figure, the needles of the upper and lower combs are facing each other, and the distance between the needles in the vertical direction is consistent. This is because the density of the needles in the two combs is the same and the length is the same.

[0014] If you bend the two combs downward in the middle and still keep the spacing between the needles consistent, you might as well set their curvatures to be consistent. After the right ends are aligned, the left ends will not be aligned.

[0015] As the instruction manual Figure 2 As shown in the figure, the comb needles of the upper comb become sparse, while the comb needles of the lower comb become dense. The reasons are as follows:

[0016] Generally, a comb has a neutral layer (shown as a dotted line) when it bends. This layer remains constant after the bend. Scientifically speaking, edges on opposite sides of the neutral layer from the bend center become longer, while edges on the same side of the neutral layer from the bend center become shorter.

[0017] The cross-sectional shape and mounting position of the grooved needle bed and the bar bed on which the guide needles are mounted on mainstream high-speed machines are similar to the two combs mentioned above. This difference is negligible in small areas, but it accumulates, manifesting as the guide needle aligning with the groove needle at its far left but becoming misaligned at its far right.

[0018] The bed frame of mainstream high-speed knitting machines is currently mounted on two elastic legs at each end. (A few warp knitting machines have auxiliary elastic supports in the middle, but these do not provide primary support.) This naturally results in sagging in the middle. Even with specialized machining techniques, controlling its straightness is difficult. This degree of overall deflection does not significantly impact machine performance.

[0019] Thus, according to the existing technology, it is difficult to ensure that the yarn guide needles installed on the needle mounting table are aligned with the groove needles after being transferred to the back of the warp knitting machine.

[0020] 2. Product changes and adjustments are complicated

[0021] The distribution density of the hangers on the combing bar bed where the yarn guide needles are installed is often different for different warp knitting machine models.

[0022] To this end, the present invention provides a needle mounting platform for mounting yarn guide needles of a warp knitting machine. Summary of the Invention

[0023] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0024] The technical solution adopted by the present invention to solve its technical problems is: the needle-loading platform for installing the yarn guide needles of a warp knitting machine described in the present invention comprises a needle-loading platform base; a plurality of support legs are fixedly connected to the bottom of the needle-loading platform base; the support legs comprise a column; the column is fixedly connected to the needle-loading platform base; an adjusting screw is installed at the bottom of the column; a pad is fixedly connected to the bottom end of the adjusting screw; a pointer is provided in the middle of the adjusting screw; a ruler is installed on the needle-loading platform base; a groove needle bed is installed on the top of the needle-loading platform base; a plurality of needle pads are installed between the needle-loading platform base and the groove needle bed; the side wall of the needle-loading platform base is fixedly connected to Drywall board; a swing shaft is installed in the middle of the wall board; multiple groups of swing arms are installed in the middle of the swing shaft; a hanger seat bed is installed at the end of the swing arm; multiple groups of hanger seats are installed on the hanger seat bed; a hanger is installed on the hanger seat; a comb bed is installed on the hanger; a yarn guide needle is installed on the comb bed; a swing shaft clamping device is installed in the middle of the swing shaft; a handle is installed in the middle of the swing shaft; a C-shaped clamp is installed between the hanger seat and the hanger; an adjusting screw is installed between the hanger seat and the hanger; multiple groups of pressure plates are installed between the groove needle bed and the needle loading platform base; a dial indicator is installed on the side of the needle loading platform base.

[0025] Preferably, the base of the needle-loading table has multiple sets of adjustable support feet, with a dividing pad arranged underneath. After the horizontal level is corrected, the pointer is marked, and during use, dynamic adjustments are made according to the bending characteristics of different warp knitting machine models, and the pointer position is recorded. The reason for doing this is that different models have different cross-sections, lengths, etc. of the bed, and naturally have different bending conditions; for the same model, as long as the processing technology is stable, its bending conditions are the same.

[0026] Preferably, a ruler with an expansion coefficient significantly different from that of the needle mounting platform base is provided on the side of the needle mounting platform base, one end of which is fixed, and the longitudinal expansion and contraction of the needle mounting platform affected by temperature is detected in real time by measuring the relative displacement of the other end.

[0027] Preferably, the structure of a warp knitting machine is imitated, with a groove needle bed (the groove needles have been installed on the groove needle bed in the previous process), a swing shaft, a swing arm and a comb bed (the hanger and the comb bed have been combined into one in the previous process), which can swing with the swing shaft. At the same time, at the head of the machine, it is positioned along the longitudinal direction of the machine through a certain device (a transverse movement mechanism on the warp knitting machine); the groove needle bed is also positioned along the longitudinal direction of the machine, and is controlled not to deform in this direction.

[0028] Preferably, different from the structure of the warp knitting machine, the hanger is connected to the swing arm, and the swing arm is fixed on the swing shaft to achieve positioning; on the needle loading platform, the hanger is connected to the hanger seat, the hanger seat is fixed on the hanger bed, the hanger bed is fixed on the swing arm, and the swing arm is fixed on the swing shaft, wherein the hanger seat can be freely adjusted longitudinally along the hanger bed according to the hanger distribution of different warp knitting machine models; the groove needle bed is fixed on the base of the needle loading platform and can be adjusted in height, and by controlling the temperature change, it can be controlled to prevent deformation in this direction.

[0029] Preferably, multiple groups of comb beds of the warp knitting machine are respectively and simultaneously installed at different positions of the swing arm. The shapes of various hangers may be different, but the hole spacing design of the two linear bearings of all hangers is the same; different from the warp knitting machine, the hanger seat on the needle loading table is universal for all models. When working, each comb bed is loaded with needles one by one, so a specially designed hanger seat needs to be used.

[0030] The beneficial effects of the present invention are as follows:

[0031] 1. The present invention relates to a needle loading platform for installing yarn guide needles of a warp knitting machine. In the prior art, the needle loading platform is designed to perform horizontal correction on the bed according to the general requirements of machine equipment. As a result, the quality of needle loading is greatly affected by the straightness of the bed of the warp knitting machine. The present invention adopts a method of ensuring the quality of needle loading by quantitatively adjusting the adjustment screw of the needle loading platform according to the curvature of the bed of the warp knitting machine.

[0032] 2. The present invention relates to a needle loading table for installing yarn guide needles of a warp knitting machine. In the prior art, the temperature of the needle loading working environment is automatically controlled by an air conditioner. However, if the temperature of the ambient space is uneven, the temperature of the needle loading table may be unstable, causing the groove needle bed to be deformed by force. If no corresponding measures are taken, the quality of the needle loading will inevitably be affected. The present invention provides a detection device for the stress deformation of the groove needle bed, which can control the degree of its influence.

[0033] 3. The present invention relates to a mounting platform for installing yarn guide needles of a warp knitting machine. The prior art design of the mounting platform is not universal enough. The device of the present invention can be used to install yarn guide needles of the typical structure shown in the figure, and can be easily adjusted according to different machine models. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] Figure 1 The present invention simulates Figure 1 ;

[0036] Figure 2 The present invention simulates Figure 2 ;

[0037] Figure 3This is a schematic diagram of the needle installation requirements in the present invention;

[0038] Figure 4 This is a schematic diagram of the basic structure of the needle loading platform in the present invention;

[0039] Figure 5 It is the pad distribution diagram, in which the 0 scale line is set outward;

[0040] Figure 6 This is an assembly relationship diagram of the hanger seat, the hanger seat bed, the swing arm, and the swing shaft in the present invention;

[0041] Figure 7 This is an assembly relationship diagram of the hanger seat, the hanger, the comb bed, and the yarn guide needle in the present invention;

[0042] Figure 8 This is an assembly diagram of the backing plate and the adjusting screw in the present invention;

[0043] Figure 9 This is a schematic structural diagram of the swing shaft clamping device of the present invention;

[0044] In the figure: 1. Needle loading platform base; 2. Column; 3. Adjusting screw; 4. Pad; 5. Pointer; 6. Ruler; 7. Grooved needle bed; 8. Needle bed pad; 9. Wall panel; 10. Swing shaft; 11. Swing arm; 12. Hanger bed; 13. Hanger seat; 14. Hanger; 15. Comb bed; 16. Yarn guide needle; 17. Swing shaft clamping device; 18. Handle; 19. C-shaped clamp; 20. Adjusting screw; 21. Pressing plate; 22. Dial indicator. DETAILED DESCRIPTION

[0045] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0046] like Figures 3 to 9As shown, the embodiment of the present invention is a needle-loading platform for installing yarn guide needles of a warp knitting machine; it includes a needle-loading platform base 1; a plurality of support legs are fixedly connected to the bottom of the needle-loading platform base 1; the support legs include a column 2; the column 2 is fixedly connected to the needle-loading platform base 1; an adjusting screw 3 is installed at the bottom of the column 2; a pad 4 is fixedly connected to the bottom end of the adjusting screw 3; a pointer 5 is provided in the middle of the adjusting screw 3; a ruler 6 is installed on the needle-loading platform base 1; a groove needle bed 7 is installed on the top of the needle-loading platform base 1; a plurality of needle pads 8 are installed between the needle-loading platform base 1 and the groove needle bed 7; a plurality of wall panels 9 are fixedly connected to the side walls of the needle-loading platform base 1; a swing shaft 10 is installed in the middle of the wall panel 9; the swing shaft 10 is equipped with multiple groups of swing arms 11 in the middle; a hanger seat 12 is installed at the end of the swing arm 11; multiple groups of hanger seats 13 are installed on the hanger seat 12; a hanger 14 is installed on the hanger seat 13; a comb bed 15 is installed on the hanger 14; a yarn guide needle 16 is installed on the comb bed 15; a swing shaft clamping device 17 is installed in the middle of the swing shaft 10; a handle 18 is installed in the middle of the swing shaft 10; a C-shaped clamp 19 is installed between the hanger seat 13 and the hanger 14; an adjusting screw 20 is installed between the hanger seat 13 and the hanger 14; multiple groups of pressing plates 21 are installed between the groove needle bed 7 and the needle loading platform base 1; a dial indicator 22 is installed on the side of the needle loading platform base 1

[0047] 1. The swing shaft 10 is positioned on several wall panels 9 through radial bearings and thrust bearings. All wall panels 9 are fixed to the bed, and the thrust bearing is installed on the wall panel 9 at the far right end; the hanger bed 12 is fixed to the swing shaft 10 through the swing arm 11; the hanger seat 13 is installed on the hanger bed 12, and each hanger seat 13 simultaneously presses the two vertical positioning surfaces of the hanger 14 to the hanger bed 12 through a screw (the hanger bed 12 plays the role of a guide rail), and according to the distribution of the hanger 14 of the warp knitting machine model, it can be freely adjusted in the left and right directions without restriction in position; the comb bed 15 is connected to the comb bed 15 through the hanger 14 on it On the hanger seat 13, the hanger 14 and the hanger seat 13 are directly mounted with linear bearings. Relative to the hanger seat 13, the comb bed 15 can only move left and right. The left and right position of the comb bed 15 relative to the groove needle can be adjusted by the adjusting screw 20 on the first hanger seat 13, and clamped by the C-shaped clamp 19. In this way, the comb bed 15 can swing with the swing shaft 10, and the right end is positioned on the wall panel 9 equipped with a thrust bearing, and the other parts are not affected by the expansion and contraction of the swing shaft 10 or the hanger seat 12; the groove needle bed 7 is fixed to the bed, and the pressure plate 21 is basically installed according to the distribution of the swing arm 11, but the groove needle bed 7 is affected by the expansion and contraction of the needle loading bed ( Figure 4 );

[0048] 2. The hanger seat 13 has the versatility to install different comb beds 15 ( Figure 7); The groove needle bed 7 is positioned on the bed by the needle mattress plate 8. The height of the groove needle bed 7 can be adjusted by replacing the needle mattress plate 8 of different thicknesses ( Figure 4 );

[0049] 3. By adjusting the screw 3 (the screw 3 is marked with a pointer to facilitate the determination of the rotation angle), the deformation of the bed of the frame in the up and down directions can be adjusted to make it roughly consistent with the bending of the warp knitting machine bed; there is a pad 4 with engraved lines under the adjusting screw 3, which can be used in conjunction with the pointer to record the adjustment position of the support foot ( Figure 5 ); In order to ensure a stable state, requirements should be put forward for the wear resistance of the friction parts of the adjusting screw 3, the column 2 and the pad 4, and they should be improved through heat treatment. At the same time, they should be greased during daily use;

[0050] 4. On the side of the needle loading bed ( Figure 4 ), set a carbon fiber ruler 6 with a length close to that of the bed (its linear expansion coefficient is close to 0, so it is quite different from the linear expansion coefficient of the cast iron bed), one end of which is fixed to the bed, and the other end face is measured by a dial indicator 22 fixed to the bed. The left end face of the ruler 6 is required to be perpendicular to the axis of the bed to ensure that if the left end of the ruler 6 moves perpendicular to the axis of the bed accidentally, it will not affect the reading of the dial indicator 22; in this way, the change in the reading of the dial indicator 22 is the change in the length of the bed relative to the ruler 6;

[0051] 5. In order to locate the circumferential position of the comb bed 15, several sets of swing shaft clamping devices 17 and handles 18 are designed on the swing shaft 10 ( Figure 9 ), and adjust according to the swing range;

[0052] When working;

[0053] Installation steps of needle mounting base 1:

[0054] 1. Install column 2 and adjusting screw 3 on the bed (the threaded parts of column 2 and adjusting screw 3 should be greased to reduce wear);

[0055] 2. Place the needle table in place according to the diagram ( Figure 5 ), insert the backing plate 4 under the adjusting screw 3, with the head of the adjusting screw 3 facing the socket of the backing plate 4 (the contact part between the screw and the backing plate 4 should be greased to reduce wear);

[0056] 3. Preliminary correction of the bed level and adjustment of each support leg;

[0057] 4. Install bearings and other accessories on the swing shaft 10 wall panel 9;

[0058] 5. Clean the bottom surface of the swing shaft 10 wall panel 9;

[0059] 6. Install the swing shaft 10 and the wall panel 9, and position them with the pins to ensure that the bearing holes of the swing shaft 10 and the wall panel 9 are coaxial;

[0060] 7. Pass the pendulum shaft 10 through each pendulum shaft 10 wall plate 9 bearing, as well as other accessories such as the pendulum arm 11;

[0061] 8. Axially positioning the swing shaft 10 and other accessories such as the swing arm 11 thereon, wherein the distribution of the swing arm 11 is axially positioned according to the corresponding screw hole positions on the hanger bed 12;

[0062] 9. Correct the circumferential consistency of the swing arm 11: Place the large surface of the positioning surface of the swing arm 11 upwards and lock the swing shaft 10; adjust the circumferential position of the swing arm 11 so that the large surface of its positioning surface is horizontal;

[0063] 10. Install the hanger bed 12. After completion, loosen the swing shaft 10 (pay attention to safety) and slowly lower the hanger bed 12.

[0064] 11. Install the hanger seat 13: Sink the screws into the T-slot of the hanger seat bed 12, install the hanger seat 13, and adjust the left and right positions of the hanger seat 13 according to the distribution of the comb bed 15 and the hanger 14;

[0065] 12. Adjust the swing shaft clamping device 17 so that the hanger bed 12 swings within a suitable range;

[0066] 13. Install ruler 6. Fix ruler 6 on the right (or left) side of the bed. Install dial indicator 22 on the other side of the bed, with the dial indicator 22 head against the end face of ruler 6. Move ruler 6 back and forth until it contacts the end face of dial indicator 22. If the pointer does not move, it indicates that the left end face of ruler 6 is perpendicular to the axis of the bed. Otherwise, the left end face of ruler 6 should be properly filed. In this way, if the free end of ruler 6 moves perpendicular to the longitudinal direction unexpectedly, it will not affect the reading.

[0067] 14. Install other accessories;

[0068] 15. Correct the bed level again and adjust the support legs;

[0069] 16. Mark the pointer on the outside of the adjusting screw 3, align it with the 0 mark on the pad 4, and apply glue around the pad 4 to make it stick to the ground ( Figure 8 ).

[0070] Installation steps of yarn guide needle 16:

[0071] 1. According to the technical requirements of warp knitting machine products regarding ambient temperature, control the room temperature to be constant;

[0072] 2. Adjust the position of the hanger seat 13 according to the distribution of the hangers 14 on the comb bed 15;

[0073] 3. Install the comb bed 15 and align its left and right positions;

[0074] 4. Install the groove needle bed 7 and align its left and right positions;

[0075] 5. Rotate the swing shaft 10 so that after the guide needles 16 are installed, they are aligned with the groove needles in the front and back directions (the hanger 14 on the comb bed 15 has been assembled and the front and back positions are consistent. In this way, by rotating the swing shaft 10, it is ensured that all the guide needles 16 on it can be aligned with the groove needles in the front and back directions at the same time);

[0076] 6. Install the yarn guide needle 16 on the far right, aligning the screw holes. This way, there is more room for left and right adjustment.

[0077] 7. Adjust the adjusting screw 20 on the right end hanger seat 13 to optimize the left and right relative positions of the yarn guide needle 16 and the groove needle, and clamp the C-shaped clamp 19;

[0078] 8. Adjust the pointer 22 of the dial indicator to the 0 mark;

[0079] 9. Connect the first yarn guide needle 16 and install the other yarn guide needles 16 one by one from right to left. After installing a certain number of yarn guide needles 16 (corresponding to a certain time or distance), check the possible change in the reading of the dial indicator 22. If the change exceeds a certain limit, release the remaining pressing plates 21 of the needle bed 7 except the first pressing plate 21 at the far right, then re-tighten the pressing plates 21 and adjust the reading of the dial indicator 22 to 0. Continue in this way until the installation of the yarn guide needles 16 is completed.

[0080] Re-adjust the straightness of the needle loading table (this will be exempted once the process parameters are mature):

[0081] 1. Transfer and install the needle bed 7 and the bar bed 15 on the warp knitting machine and check the coordination between the guide needle 16 and the needle: First, adjust the relative position of the needle bed 7 and the bar bed 15 at the right end, and then check the other positions of the needle bed 7 and the bar bed 15, such as the left end and the middle. Take photos to record any deviation at the left end, as this deviation reflects the difference in deformation between the warp knitting machine bed and the needle loading bed.

[0082] 2. Install the subsequent bar bed 15 and groove needle bed 7 of the same model, and complete the positioning of the bar bed 15 relative to the groove needle bed 7. Install a yarn guide needle 16 at the left and right ends of the bar bed 15 according to the standard position. Adjust the support feet of the bed and observe the changes in the relative position of the yarn guide needle 16 and the groove needle at the left end of the bar bed 15 until it is the same as the previous photographic record. This shows that: from the perspective of affecting the relative position of the yarn guide needle 16 and the groove needle, at this time, the deformation state of the warp knitting machine bed is consistent with the deformation state of the needle loading bed;

[0083] 3. For the corresponding machine model, list and record the scale value indicated by the pointer on each adjusting screw 3; when installing the yarn guide needle 16 of this model again in the future, it can be quickly adjusted into place according to the record (if the needle loading table is worn due to long-term use, a new record table can be made).

[0084] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A needle-mounting platform for installing yarn guide needles of a warp knitting machine, comprising a needle-mounting platform base (1); characterized in that: The bottom of the needle-loading platform base (1) is fixed with multiple sets of supporting legs; the supporting legs include columns (2); the columns (2) are fixed to the needle-loading platform base (1); the bottom of the columns (2) is installed with an adjusting screw (3); the bottom end of the adjusting screw (3) is fixed with a pad (4); a pointer (5) is provided in the middle of the adjusting screw (3); the needle-loading platform base (1) is installed with a ruler (6); a groove needle bed (7) is installed on the top of the needle-loading platform base (1); multiple sets of needle bed pads (8) are installed between the needle-loading platform base (1) and the groove needle bed (7); the side walls of the needle-loading platform base (1) are fixed with multiple wall panels (9); a swing shaft (10) is installed in the middle of the wall panel (9); multiple sets of swing arms (11) are installed in the middle of the swing shaft (10); the swing arms (11) A hanger seat (12) is installed at the end; multiple groups of hanger seats (13) are installed on the hanger seat (12); a hanger (14) is installed on the hanger seat (13); a comb bed (15) is installed on the hanger (14); a yarn guide needle (16) is installed on the comb bed (15); a swing shaft clamping device (17) is installed in the middle of the swing shaft (10); a handle (18) is installed in the middle of the swing shaft (10); a C-shaped clamp (19) is installed between the hanger seat (13) and the hanger (14); an adjusting screw (20) is installed between the hanger seat (13) and the hanger (14); multiple groups of pressing plates (21) are installed between the groove needle bed (7) and the needle loading platform base (1); a dial indicator (22) is installed on the side of the needle loading platform base (1); The pad (4) is provided with engraved lines; the engraved lines are used to record the adjustment position of the support legs; the ruler (6) is made of a carbon fiber material having a linear expansion coefficient that is significantly different from that of the material of the needle mounting platform base (1); one end of the ruler (6) is fixed to one end of the needle mounting platform base (1), and the other end is measured by a dial indicator (22); the left end face of the ruler (6) is perpendicular to the axis of the needle mounting platform base (1); the dial indicator (22) is supported by the end face of the ruler (6) and is used to measure the longitudinal expansion and contraction of the needle mounting platform base (1) under the influence of temperature.

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