A jig for focusing a camera module

Abstract

The utility model relates to camera module production technical field, the technical problem that the utility model wants to solve is unstable. In order to solve the above technical problem, the utility model provides a kind of for camera module focusing jig. The utility model includes: base;Clamping drive part is connected with base;The output of clamping drive part is connected with one of two upper cover plate sliders, and two upper cover plate sliders are connected by connecting rod component;Upper cover plate slider slidingly connects on base;Push block is connected with one of two upper cover plate sliders;The inside of upper cover plate slider is equipped with limit claw;Base is equipped with product mould cavity and lens mould cavity;Probe mounting seat of lighting component is connected on base up and down slidingly;Probe mounting seat is equipped with conical mounting hole, and probe sleeve is equipped with the conical section matched with conical mounting hole;Probe sleeve is sleeved on probe body;Probe sleeve, probe body are slid up and down in probe mounting seat. The utility model improves the stability of lighting.

Description

Technical Field

[0001] This utility model relates to the field of camera module manufacturing technology, and in particular to a jig for focusing a camera module. Background Technology

[0002] Active Alignment (AA) is a technology that achieves high-precision optical focusing by dynamically adjusting the relative position of the lens and the image sensor. It is widely used in the production of high-precision imaging devices such as automotive cameras and mobile phone lenses.

[0003] However, as is well known, camera module focusing involves fixing the front shell and the product within a fixture, and then moving the lens relative to adjust the focus. In mass production, the consistency of the product after AA focusing depends on the consistency of the fixture. It can be said that the fixture is the foundation of the AA focusing process, and only a good fixture can guarantee the performance of the product.

[0004] Currently, most existing camera focusing fixtures use a cylinder on one side to control the opening and closing of the cover plate and a cylinder lifting and lighting mechanism. However, since the cylinder is located on one side, the upper cover plate may experience steering deviation and jamming when the cylinder drives the opening and closing. At the same time, the lighting mechanism may experience unstable lighting when the probe is not concentric with the product during the lifting process. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the above-mentioned problems existing in the prior art.

[0006] To solve the above-mentioned technical problems, this utility model provides a fixture for focusing a camera module, comprising:

[0007] Base;

[0008] The clamping assembly includes a base, a clamping drive unit, two upper cover plate sliders, a connecting rod assembly, and a push block. The base is connected to the top of a base plate. The clamping drive unit is connected to the base. The output end of the clamping drive unit is connected to one of the two upper cover plate sliders, and the two upper cover plate sliders are connected by the connecting rod assembly. The upper cover plate slider is slidably connected to the base. The push block is connected to one of the two upper cover plate sliders. A limiting claw is provided on the inner side of the upper cover plate slider. The clamping drive unit drives the two upper cover plate sliders to translate in opposite directions and drives the push block to translate. The base is provided with a product mold cavity and a lens mold cavity.

[0009] The lighting assembly includes a probe mounting base, a positioning ring, a buffer spring, a probe sleeve, and a probe body. The probe mounting base is slidably connected to the base. From bottom to top, the positioning ring, the buffer spring, and the probe sleeve are sequentially arranged in the probe mounting base. The probe mounting base has a tapered mounting hole, and the probe sleeve has a tapered section that mates with the tapered mounting hole. The probe sleeve is fitted onto the probe body. The probe sleeve and the probe body slide up and down in the probe mounting base.

[0010] In one embodiment of the present invention, the probe mounting base is provided with a first mounting step hole communicating with the tapered mounting hole; a positioning ring is disposed in the first mounting step hole; the bottom of the probe sleeve slides up and down in the first mounting step hole; a buffer spring is disposed in the first mounting step hole, and the buffer spring is disposed between the positioning ring and the probe sleeve.

[0011] In one embodiment of the present invention, the lighting component further includes a pressure block connected in the probe mounting base; the pressure block is connected to the bottom of the positioning ring.

[0012] In one embodiment of this utility model, a set of diagonal corners of the product mold cavity are provided with multiple limiting protrusions and notches; the multiple limiting protrusions form an L-shaped limiting surface; a push block is provided at the notch, and the push block moves to abut against the product.

[0013] In one embodiment of this utility model, the lighting component further includes a power unit and a transmission unit; the output end of the power unit extends and retracts in the horizontal plane; the output end of the power unit is connected to the transmission unit, and the transmission unit is connected to the probe mounting base.

[0014] In one embodiment of the present invention, the transmission part includes a driving member and a first follower; the output end of the power part is connected to the driving member; the upper surface of the driving member is provided with an arc-shaped surface; along the extension direction of the arc-shaped surface, the height of the arc-shaped surface decreases sequentially; the first follower contacts the arc-shaped surface and is connected to the probe mounting base.

[0015] In one embodiment of this utility model, there are two connecting rod components, and the two ends of the two upper cover plate sliders are respectively connected by the connecting rod components.

[0016] In one embodiment of this utility model, the connecting rod component includes a connecting rod base, two first connecting rods and a second connecting rod; the connecting rod base is connected to the base; the second connecting rod is movably connected to the connecting rod base; both ends of the second connecting rod are respectively connected to one end of the two first connecting rods, and the other ends of the two first connecting rods are respectively connected to two upper cover plate sliders.

[0017] In one embodiment of the present invention, the connecting rod component further includes a plurality of first tension springs and second tension springs; the two ends of the first tension springs are respectively connected to two upper cover plate sliders; the two ends of the second tension springs are respectively connected to the base and the push block.

[0018] In one embodiment of this utility model, one of the two upper cover plate sliders is provided with an oblong hole; a second follower is connected to the push block, and the second follower cooperates with the oblong hole.

[0019] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0020] The fixture for focusing a camera module described in this utility model specifically achieves the synchronous opening and closing of the two upper cover sliders and the linkage for positioning the product by means of a clamping drive unit and a connecting rod component. Furthermore, the tapered mounting hole and the tapered section of the probe sleeve are fitted together, and a buffer spring keeps the probe sleeve in contact with the tapered mounting hole. Thus, when the probe body and the product's connector are not concentric, the connector presses down on the probe body, causing the probe body to push the probe sleeve down and disengage from the stepped tapered mounting hole, adjusting the angle to adapt to the connector's orientation, thereby improving lighting stability. Attached Figure Description

[0021] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0022] Figure 1 This is a schematic diagram of the structure of a fixture for focusing a camera module in a preferred embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A schematic diagram of another view of the fixture used for focusing the camera module;

[0024] Figure 3 yes Figure 1 A top view of the fixture used for focusing the camera module;

[0025] Figure 4 yes Figure 1 The diagram shows the structure of the base in the fixture used for focusing the camera module;

[0026] Figure 5 yes Figure 1 An exploded view of the base in the fixture used for focusing the camera module;

[0027] Figure 6 yes Figure 1 An exploded view of the clamping components in the fixture used for focusing the camera module;

[0028] Figure 7 yes Figure 1 The diagram shows the structure of the lighting component in the fixture used for focusing the camera module;

[0029] Figure 8 yes Figure 1 A top view of the illuminated component in the fixture used for focusing the camera module;

[0030] Figure 9 yes Figure 8 AA section view;

[0031] Figure 10 yes Figure 1 An exploded view of the illuminated component in the fixture used for focusing the camera module;

[0032] Instruction manual drawing reference numerals: 100, base; 110, base plate; 120, support plate; 130, bushing; 140, quick-change knob; 150, tee; 160, first air pipe connector; 170, second air pipe connector;

[0033] 200. Clamping assembly; 210. Base; 211. Product mold cavity; 212. Lens mold cavity; 213. Limiting protrusion; 214. Notch; 215. First guide shaft; 216. Return spring; 220. Clamping drive unit; 230. Upper cover plate slider; 231. Limiting claw; 232. Waist-shaped hole; 233. Second follower; 240. Linkage assembly; 241. Linkage base; 242. First link; 243. Second link; 244. Step screw; 245. First copper sleeve; 246. Second copper sleeve; 247. First tension spring; 248. Second tension spring; 249. Tension spring support; 250. Push block; 251. L-shaped limiting groove;

[0034] 300. Illumination component; 310. Probe mounting base; 311. Tapered mounting hole; 312. First mounting step hole; 313. Second mounting step hole; 314. Second guide shaft; 320. Positioning ring; 330. Buffer spring; 340. Probe sleeve; 341. Tapered section; 350. Probe body; 360. Pressure block; 361. Mounting groove; 370. Power unit; 380. Transmission unit; 381. Drive component; 382. First follower; 383. Arc-shaped surface; 390. Probe slider; 391. Linear bearing;

[0035] 400. Products;

[0036] 500. Lens. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0038] Reference Figures 1-10As shown, this embodiment of the utility model provides a fixture for focusing a camera module, comprising:

[0039] Base 100;

[0040] The clamping assembly 200 includes a base 210, a clamping drive unit 220, two upper cover plate sliders 230, a connecting rod component 240, and a push block 250. The base 210 is connected to the top of the base 100. The clamping drive unit 220 is connected to the base 210. The output end of the clamping drive unit 220 is connected to one of the two upper cover plate sliders 230, and the two upper cover plate sliders 230 are connected via the connecting rod component 240. The upper cover plate sliders 230 are slidably connected to the base 210. The push block 250 is connected to one of the two upper cover plate sliders 230. The inner surface of the upper cover plate slider 230... A limiting claw 231 is provided on the side; a clamping drive unit 220 drives two upper cover plate sliders 230 to translate in opposite directions and drives a push block 250 to translate; a product mold cavity 211 and a lens mold cavity 212 are provided on the base 210; the product mold cavity 211 and the lens mold cavity 212 are located between the two upper cover plate sliders 230; the product mold cavity 211 is used to place the product 400, and the lens mold cavity 212 is used to place the lens 500; when the two upper cover plate sliders 230 are closed, the push block 250 abuts against the side wall of the product 400; the limiting claw 231 translates to the upper surface of the product 400. In some embodiments, the upper cover plate slider 230 is connected to the top of the base 210 via a guide rail and a slider. The push block 250 is also connected to the top of the base 210 via a guide rail and a slider. The product mold cavity 211 and the lens mold cavity 212 are connected to the top of the base 210. In some embodiments, the clamping drive unit 220 is a cylinder.

[0041] The lighting component 300 includes a probe mounting base 310, a positioning ring 320, a buffer spring 330, a probe sleeve 340, and a probe body 350. The probe mounting base 310 is slidably connected to the base 100. From bottom to top, the positioning ring 320, the buffer spring 330, and the probe sleeve 340 are sequentially arranged in the probe mounting base 310. The probe mounting base 310 is provided with a tapered mounting hole 311, and the probe sleeve 340 is provided with a tapered section 341 that mates with the tapered mounting hole 311. The probe sleeve 340 is fitted onto the probe body 350. The probe sleeve 340 and the probe body 350 slide up and down in the probe mounting base 310.

[0042] Specifically, this application achieves the synchronous opening and closing of the two upper cover sliders 230 and the linkage of the push block 250 to position the product 400 through the cooperation of a clamping drive unit 220 and a connecting rod component 240. Furthermore, the clamping drive unit 220 is located in the middle position, allowing it to cooperate with the connecting rod component 240 and the first tension spring 247 located on either side, thus ensuring stable and smooth driving of the two upper cover sliders 230 and preventing steering deviation and jamming.

[0043] In addition, when the probe body 350 is subjected to a downward force, the buffer spring 330 is compressed, and the tapered section 341 disengages from the stepped tapered mounting hole 311. At this time, the combined mechanism consisting of the probe sleeve 340, the probe body 350, and the buffer spring 330 can rotate freely within the assembly cavity. After the external force disappears, the probe sleeve 340 and the probe body 350 can be reset under the action of the buffer spring 330, and the tapered section 341 is tightly attached to the stepped tapered mounting hole 311, so that the initial state of the probe body 350 has stability, thereby improving the lighting stability.

[0044] In some embodiments, the base 100 includes a base plate 110, at least two support plates 120, a bushing 130, and a quick-change knob 140. The two support plates 120 are connected to both ends of the base plate 110. The bushing 130 and the quick-change knob 140 are disposed on the base plate 110. The bushing 130 and the quick-change knob 140 are used to position and mount the base plate 110 onto the docking equipment. The base plate 110 supports the entire fixture. The support plates 120 support the clamping assembly 200. The base plate 110 is also provided with a tee 150, which is connected to a plurality of first air pipe connectors 160 and a plurality of second air pipe connectors 170 for quick-change of the air source in the event of a fixture quick-change.

[0045] Furthermore, the probe mounting base 310 is provided with a first mounting step hole 312 communicating with the tapered mounting hole 311; the positioning ring 320 is disposed in the first mounting step hole 312; the bottom of the probe sleeve 340 slides up and down in the first mounting step hole 312; the buffer spring 330 is disposed in the first mounting step hole 312, and the buffer spring 330 is disposed between the positioning ring 320 and the probe sleeve 340.

[0046] Furthermore, the lighting component 300 also includes a pressure block 360, which is connected to the probe mounting base 310 and to the bottom of the positioning ring 320. In some embodiments, the probe mounting base 310 has a second mounting step hole 313. The second mounting step hole 313, the first mounting step hole 312, and the tapered mounting hole 311 are sequentially connected. The pressure block 360 is disposed in the second mounting step hole 313 and is connected to the probe mounting base 310 by bolts. The top of the pressure block 360 has a mounting groove 361, and the bottom of the positioning ring 320 has a mounting groove 361. Specifically, the bottom end of the probe body 350 extends through the pressure block 360, the positioning ring 320, and the probe sleeve 340 to the bottom of the pressure block 360. The probe body 350 and the probe sleeve 340 are threadedly connected. The pressure block 360 fixes the positioning ring 320 and the probe sleeve 340 in the probe mounting base 310.

[0047] Furthermore, a plurality of limiting protrusions 213 and notches 214 are respectively provided on a set of diagonals of the product cavity 211; the plurality of limiting protrusions 213 form an L-shaped limiting surface; a push block 250 is provided at the notch 214, and the push block 250 moves to abut against the product 400. In some embodiments, the push block 250 is provided with an L-shaped limiting groove 251, and the L-shaped limiting groove 251 abuts against the corner of the product 400. In some possible embodiments, the push block 250 moves along the diagonal of the product 400.

[0048] Specifically, in this embodiment, an L-shaped limiting surface is used to limit one corner of the product 400, and then the push block 250 is moved. The push block 250 abuts against the opposite corner of the product 400, thereby stably and reliably restricting the product 400 in the first contour groove, preventing the product 400 from shifting in the first contour groove.

[0049] This application achieves accurate and consistent workpiece positioning through a combination of clamping and side pushing, and diagonal positioning.

[0050] Furthermore, the lighting component 300 also includes a power unit 370 and a transmission unit 380; the output end of the power unit 370 extends and retracts in the horizontal plane; the output end of the power unit 370 is connected to the transmission unit 380, and the transmission unit 380 is connected to the probe mounting base 310.

[0051] Specifically, in this embodiment, the probe body 350 is driven to move up and down under the drive of the horizontally telescopic power unit 370, resulting in a compact structure that is more suitable for automated production lines. In some embodiments, the power unit 370 is a cylinder.

[0052] Further, the transmission unit 380 includes a drive member 381 and a first follower 382; the output end of the power unit 370 is connected to the drive member 381; the upper surface of the drive member 381 is provided with an arc-shaped surface 383; along the extending direction of the arc-shaped surface 383, the height of the arc-shaped surface 383 decreases sequentially; the first follower 382 contacts the arc-shaped surface 383 and is connected to the probe mounting base 310. In some embodiments, a guide portion is provided between the drive member 381 and the base 100.

[0053] Specifically, the power unit 370 drives the drive component 381 to reciprocate on the guide section, and then, with the cooperation of the arc surface 383 and the first follower 382, ​​it drives the probe body 350 to move up and down, converting the kinetic energy of horizontal movement into the kinetic energy of vertical movement. The operation is stable and reliable, improving the stability of the product 400 lighting.

[0054] In some embodiments, the lighting assembly 300 further includes a probe slider 390, which is disposed above the base 100; the probe slider 390 is rotatably connected to the first follower 382; and the probe slider 390 is connected to the probe mounting base 310. The probe mounting base 310 moves up and down synchronously with the probe slider 390.

[0055] In some embodiments, the base 210 is provided with a plurality of (e.g., four) first guide shafts 215, and a return spring 216 is sleeved on the first guide shaft 215. The return spring 216 is located between the probe slider 390 and the base 210, and pushes the probe slider 390 downward to reset. A linear bearing 391 is sleeved on the first guide shaft 215, and the linear bearing 391 is connected to the probe slider 390 for positioning when lit.

[0056] In some embodiments, the probe mounting base 310 is provided with at least one second guide shaft 314, and a linear bearing 391 is sleeved on the second guide shaft 314. The linear bearing 391 is connected to the product mold cavity 211 to enhance the positioning of the lighting component 300 and the product 400.

[0057] Furthermore, there are two connecting rod components 240, and the two ends of the two upper cover sliders 230 are connected through the connecting rod components 240 respectively.

[0058] Specifically, in this embodiment, both ends of the two upper cover sliders 230 are connected by a connecting rod component 240 to ensure the stability of power transmission.

[0059] Further, the connecting rod assembly 240 includes a connecting rod base 241, two first connecting rods 242, and a second connecting rod 243; the connecting rod base 241 is connected to the base 210; the second connecting rod 243 is movably connected to the connecting rod base 241; both ends of the second connecting rod 243 are respectively connected to one end of the two first connecting rods 242, and the other ends of the two first connecting rods 242 are respectively connected to two upper cover plate sliders 230. In some embodiments, a stepped screw 244 passes through a first copper sleeve 245 to connect the second connecting rod 243 to the connecting rod base 241, and the second connecting rod 243 can rotate around the first copper sleeve 245. The stepped screw 244 passes through a second copper sleeve 246 to connect the first connecting rod 242 and the second connecting rod 243.

[0060] Specifically, in this embodiment, the two upper cover plate sliders 230 move synchronously in opposite directions through the cooperation of the first connecting rod 242 and the two second connecting rods 243, resulting in a stable structure.

[0061] Furthermore, the connecting rod component 240 also includes a plurality of first tension springs 247 and second tension springs 248; the two ends of the first tension springs 247 are respectively connected to two upper cover plate sliders 230; the two ends of the second tension springs 248 are respectively connected to the base 210 and the push block 250. In some embodiments, the end of the first tension spring 247 is connected to the upper cover plate slider 230 via a tension spring support 249. The two ends of the second tension spring 248 are respectively connected to the push block 250 and the base 210 via the tension spring support 249.

[0062] Specifically, the first tension spring 247 can pull the two upper cover sliders 230 to move towards the center and approach the product 400. The second tension spring 248 pulls the push block 250 to move towards the product 400 to fix and limit the product 400.

[0063] Furthermore, one of the two upper cover plate sliders 230 is provided with an oblong hole 232; a second follower 233 is connected to the push block 250, and the second follower 233 cooperates with the oblong hole 232.

[0064] Specifically, in this embodiment, the second follower 233 cooperates with the waist-shaped hole 232 so that when the upper cover slider 230 moves outward, it can drive the push block 250 to move outward away from the product 400.

[0065] The lighting component 300 illuminates and conducts light to the product 400, while the clamping component 200 is used to position and fix the product 400.

[0066] The clamping drive unit 220 extends and drives the two upper cover sliders 230 to move to both sides away from the product 400 via the connecting rod component 240. The limiting claw 231 is used to limit the top of the product 400. The clamping drive unit 220 in the lighting assembly 300 retracts, driving the drive member 381 to move to the right. The first follower 382 abuts against the lower surface of the drive member 381, and the lighting assembly 300 moves downward and detaches from the product 400 under the action of the buffer spring 330.

[0067] The clamping drive part 220 of the clamping assembly 200 extends, driving the two upper cover sliders 230 to move to both sides, driving the limiting claws 231 to move to both sides to disengage from the product 400, and at the same time driving the push block 250 to move outward to disengage from the product 400, removing the product 400, and placing a new product 400 and lens 500.

[0068] The clamping drive part 220 of the clamping assembly 200 retracts, and the two upper cover sliders 230 move towards the center under the drive of the first tension spring 247, driving the limiting claw 231 to move inward to position the product 400. At the same time, the push block 250 moves inward to fix the product 400 under the pull of the second tension spring 248.

[0069] The power unit 370 in the lighting component 300 extends out, driving the drive component 381 to move to the left, driving the probe slider 390 to move upward, and driving the probe body 350 to move upward to contact the product 400 and light up the product 400.

[0070] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A fixture for focusing a camera module, characterized in that: include: Base; The clamping assembly includes a base, a clamping drive unit, two upper cover sliders, a connecting rod assembly, and a push block; The base is connected to the top of the base; the clamping drive unit is connected to the base; the output end of the clamping drive unit is connected to one of the two upper cover plate sliders, and the two upper cover plate sliders are connected by the connecting rod component; the upper cover plate slider is slidably connected to the base; the push block is connected to one of the two upper cover plate sliders; the inner side of the upper cover plate slider is provided with a limiting claw; the clamping drive unit drives the two upper cover plate sliders to translate in opposite directions and drives the push block to translate; the base is provided with a product mold cavity and a lens mold cavity; The lighting assembly includes a probe mounting base, a positioning ring, a buffer spring, a probe sleeve, and a probe body; the probe mounting base is slidably connected to the base; from bottom to top, the positioning ring, the buffer spring, and the probe sleeve are sequentially disposed in the probe mounting base; the probe mounting base has a tapered mounting hole, and the probe sleeve has a tapered section that mates with the tapered mounting hole; the probe sleeve is fitted onto the probe body; the probe sleeve and the probe body slide up and down in the probe mounting base.

2. The fixture for focusing a camera module according to claim 1, characterized in that: The probe mounting base is provided with a first mounting step hole communicating with the tapered mounting hole; the positioning ring is disposed in the first mounting step hole; the bottom of the probe sleeve slides up and down in the first mounting step hole; the buffer spring is disposed in the first mounting step hole, and the buffer spring is disposed between the positioning ring and the probe sleeve.

3. The fixture for focusing a camera module according to claim 2, characterized in that: The lighting assembly also includes a pressure block, which is connected in the probe mounting base; The pressure block is connected to the bottom of the positioning ring.

4. The fixture for focusing a camera module according to claim 1, characterized in that: The product mold cavity has a set of multiple limiting protrusions and notches at one of its diagonals; the multiple limiting protrusions form an L-shaped limiting surface; the push block is located at the notch, and the push block moves to abut against the product.

5. The fixture for focusing a camera module according to claim 1, characterized in that: The lighting assembly also includes a power unit and a transmission unit; the output end of the power unit extends and retracts in the horizontal plane; the output end of the power unit is connected to the transmission unit, and the transmission unit is connected to the probe mounting base.

6. The fixture for focusing a camera module according to claim 5, characterized in that: The transmission unit includes a driving component and a first follower; the output end of the power unit is connected to the driving component; the upper surface of the driving component is provided with an arc-shaped surface; along the extension direction of the arc-shaped surface, the height of the arc-shaped surface decreases sequentially; the first follower contacts the arc-shaped surface and is connected to the probe mounting base.

7. The fixture for focusing a camera module according to claim 1, characterized in that: There are two connecting rod components, and the two ends of the two upper cover plate sliders are respectively connected through the connecting rod components.

8. The fixture for focusing a camera module according to claim 1, characterized in that: The connecting rod assembly includes a connecting rod base, two first connecting rods, and a second connecting rod; the connecting rod base is connected to the base; the second connecting rod is movably connected to the connecting rod base; both ends of the second connecting rod are respectively connected to one end of the two first connecting rods, and the other ends of the two first connecting rods are respectively connected to the two upper cover plate sliders.

9. The fixture for focusing a camera module according to claim 8, characterized in that: The connecting rod assembly also includes multiple first tension springs and second tension springs; the two ends of the first tension springs are respectively connected to the two upper cover plate sliders; the two ends of the second tension springs are respectively connected to the base and the push block.

10. The fixture for focusing a camera module according to claim 1, characterized in that: One of the two upper cover plate sliders is provided with an oblong hole; a second follower is connected to the push block, and the second follower cooperates with the oblong hole.

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