Automatic watch hand assembling machine and watch hand assembling method

Abstract

The invention discloses an automatic watch needle installing machine which comprises a placing unit, a needle taking mechanism, a horizontal driving mechanism and a lifting driving mechanism. The placing unit comprises a dial plate placing device, two hour / minute hand placing devices and a second hand placing device; a first needle taking head, a second needle taking head and a second needle tool are arranged at the bottom of the needle taking mechanism; the horizontal driving mechanism drives the needle taking mechanism to horizontally move, so that the first needle taking head, the second needle taking head and the second hand tool sequentially move to the position above the dial plate placer; the lifting driving mechanism drives the hand taking mechanism to lift, so that when the hand taking mechanism descends, the hour hand, the minute hand and the second hand are grabbed through the first and second hand taking heads and the second hand tool; when the hand taking mechanism ascends, the hour hand and the minute hand are taken away from the hour / minute hand placer, and the second hand is taken away from the second hand placer; and after the hand taking mechanism horizontally moves, the hand taking mechanism is driven to descend, so that the hour hand, the minute hand and the second hand are sequentially placed on the mounting column body of the dial plate. The invention further discloses a watch hand assembling method adopting the automatic watch hand assembling machine.

Description

Technical Field

[0001] The present invention relates to the technical field of watches, and in particular to an automatic watch needle assembling machine and a watch needle assembling method. Background Art

[0002] The hands are an important part of a watch, which are used to rotate under the drive of the movement to indicate the time. When assembling a watch, the movement is usually installed into the case first, the dial is fixed on the movement, and then the hands and watch glass are installed in sequence. Finally, the crown and knob are installed, and the position of the hands is adjusted by turning the knob to make the hands move accurately. At present, in the process of assembling watches, the hands are generally installed manually by operators. Due to the small size and large number of hands, the manual assembly method makes the assembly efficiency of the hands low, which in turn affects the assembly progress of the watch. In addition, affected by the operating level of the operators, the strength of the techniques used by each operator during installation is inconsistent, resulting in different tightness of the hands after assembly, poor consistency in the quality of watch assembly, and it is difficult to meet the quality control of watches. Summary of the invention

[0003] Based on this, it is necessary to provide a watch automatic needle assembly machine and a watch needle assembly method with high assembly efficiency and good assembly quality consistency to address the above-mentioned shortcomings.

[0004] A watch automatic needle-installing machine, comprising:

[0005] A placement unit, the placement unit comprising a dial placement device, two hour / minute hand placement devices and a second hand placement device located beside the dial placement device and arranged at intervals, the dial placement device having a dial placement position on the top, an hour / minute hand placement device having an hour hand placement position on the top, a minute hand placement position on the top of the other hour / minute hand placement device, and a second hand placement device having a second hand placement position on the top;

[0006] The needle taking mechanism is located above the placement unit, and the bottom of the needle taking mechanism is provided with a first needle taking head corresponding to the hour hand placement position and used to grab the hour hand, a second needle taking head corresponding to the minute hand placement position and used to grab the minute hand, and a second hand tooling corresponding to the second hand placement position and used to grab the second hand;

[0007] A horizontal driving mechanism, which is used to drive the entire needle removal mechanism to move horizontally, so that the first needle removal head, the second needle removal head and the second hand tooling are moved to the top of the dial placement position in sequence; and

[0008] A lifting drive mechanism, the lifting drive mechanism is used to drive the needle taking mechanism to lift and lower as a whole, so that when the needle taking mechanism descends, the first needle taking head grabs the hour hand on the hour hand placement position, the second needle taking head grabs the minute hand on the minute hand placement position, and the second hand on the second hand placement position through the second hand tooling; and when the needle taking mechanism rises, the hour hand and minute hand are taken away from the hour / minute hand placer, and the second hand is taken away from the second hand placer; it is also used to drive the needle taking mechanism to descend after the horizontal driving mechanism drives the needle taking mechanism to move horizontally, so that the hour hand, minute hand and second hand are placed in sequence on the mounting column of the dial on the dial placement position.

[0009] In one embodiment, the dial placer includes a first vacuum suction seat, a first vacuum air pipe installed at the bottom or side of the first vacuum suction seat and connected to an external air pressure device, a first vacuum air channel connected to the first vacuum air pipe is provided in the first vacuum suction seat, and an air suction groove connected to the first vacuum air channel is provided on the top surface of the first vacuum suction seat, and the air suction groove and the groove edge of the air suction groove together form the dial placement position.

[0010] In one embodiment, the hour / minute hand placer includes a first base, a first needle placement groove is provided in the middle of the top surface of the first base, a first needle head is accommodated in the first needle placement groove, the bottom of the first needle head is elastically connected to the bottom surface of the first needle placement groove, the top of the first needle head extends out of the first needle placement groove and forms a first needle portion for receiving the hour hand or minute hand, and a limiting space for inserting the annular protrusion at the lower edge of the hour hand or minute hand mounting hole is formed between the annular side surface of the first needle portion and the inner side surface of the first needle placement groove.

[0011] In one embodiment, the bottom surface of the needle removal mechanism is provided with a first mounting groove, a second mounting groove and a third mounting groove which are spaced apart from each other, a watch axis positioning piece is fixed in the first mounting groove, and a avoidance groove which is adapted to the shape of the mounting column on the dial is provided on the bottom surface of the watch axis positioning piece; the inner wall of the second mounting groove is provided with a first needle pressure tube extending from the notch of the second mounting groove at a position adjacent to the notch of the second mounting groove, the first needle removal head is accommodated in the second mounting groove and cooperates with the first needle pressure tube for sliding limit, and the top of the first needle removal head is elastically connected to the top surface of the groove of the second mounting groove through a first spring; the inner wall of the third mounting groove is provided with a second needle pressure tube extending from the notch of the third mounting groove at a position adjacent to the notch of the third mounting groove, the second needle removal head is accommodated in the third mounting groove and cooperates with the second needle pressure tube for sliding limit, and the top of the second needle removal head is elastically connected to the top surface of the groove of the third mounting groove through a second spring.

[0012] In one embodiment, the top edge of the first needle sleeve portion is provided with a rounded corner so that a tapered insertion area is formed between the inner wall of the mounting hole of the hour hand or the minute hand and the top edge of the first needle sleeve portion;

[0013] The first needle removal head is annular in structure, the bottom of the first needle removal head is bent in a direction away from the axis of the first needle removal head to form a first needle removal portion, and the first needle removal portion is inserted into the conical insertion area when the first needle removal head is pressed down, so that the inner wall of the mounting hole of the hour hand and the outer ring side of the first needle removal portion are interference fit;

[0014] The second needle removal head has an annular structure, and the bottom of the second needle removal head is bent in a direction away from the axis of the second needle removal head to form a second needle removal part. When the second needle removal head is pressed down, the second needle removal part is inserted into the conical insertion area so that the inner wall of the mounting hole of the minute hand is interference fit with the outer ring side of the second needle removal part.

[0015] In one embodiment, the second hand placer includes a second base, a second needle placement groove is provided in the middle of the top surface of the second base, a second needle head is fixed in the second needle placement groove, the top of the second needle head extends out of the second needle placement groove and forms a second needle portion for receiving the second hand; a vent hole is provided on the needle removal mechanism beside the third mounting groove and passes through the top and bottom surfaces of the needle removal mechanism, the top of the vent hole is connected to an external air pressure device, the second hand tooling is accommodated in the vent hole and adjacent to the lower end opening of the vent hole, the outer annular surface of the second hand tooling is sealed and connected to the inner wall of the vent hole, a second avoidance hole for accommodating the second needle head and an air suction hole located beside the second avoidance hole and connected to the vent hole so that the second hand tooling can absorb the second hand are provided in the middle of the bottom surface of the second hand tooling.

[0016] In one embodiment, a first positioning guide groove is provided on the top surface of the first base beside the first needle placement groove, a first positioning platform is provided in the first positioning guide groove, a first positioning bolt is passed through the first positioning platform and the groove wall of the first positioning guide groove and is threadedly connected with the first positioning platform and the first positioning guide groove, a side surface of the first positioning platform is slidably matched with the side wall of the first positioning guide groove, a first clamping groove for clamping the hour hand or the minute hand is provided on the top surface of the first positioning platform, and the first positioning bolt is rotated to adjust the position of the first positioning platform in the first positioning guide groove;

[0017] A second positioning guide groove is provided on the top surface of the second base beside the second needle placement groove, a second positioning platform, a second positioning bolt passing through the second positioning platform and the groove wall of the second positioning guide groove and threadedly connected to the second positioning platform and the second positioning guide groove are provided in the second positioning platform, the side surface of the second positioning platform is slidably matched with the side wall of the second positioning guide groove, a second clamping groove for clamping the second hand is provided on the top surface of the second positioning platform, and the second positioning bolt is rotated to adjust the position of the second positioning platform in the second positioning guide groove.

[0018] In one embodiment, the placement unit also includes three positioning mechanisms that are used to receive the second hand placer and the two hour / minute hand placers, and the positioning mechanisms include a second vacuum suction seat, a second vacuum air pipe installed at the bottom or side of the second vacuum suction seat and connected to an external air pressure device, a second vacuum air channel connected to the second vacuum air pipe and passing through the top surface of the second vacuum suction seat is provided in the second vacuum suction seat, at least two positioning holes are opened on the top surface of the second vacuum suction seat, at least two first positioning columns are provided at the bottom of the first base, which are inserted into each positioning hole in a one-to-one manner, and at least two second positioning columns are provided at the bottom of the second base, which are inserted into each positioning hole in a one-to-one manner.

[0019] In one embodiment, the lifting drive mechanism is a pneumatic cylinder or an electric cylinder, and the telescopic end of the lifting drive mechanism is fixedly connected to the top of the needle removal mechanism; or the lifting drive mechanism includes a needle pressing shaft driven by an external telescopic drive member and a third spring respectively fixedly connected to the external frame and the top of the needle removal mechanism, and the needle pressing shaft pushes the needle removal mechanism to descend or leave the needle removal mechanism under the drive of the external telescopic drive member.

[0020] The present invention also discloses a method for assembling watch hands using the above-mentioned automatic watch hand assembling machine, comprising the following steps:

[0021] S1. Place the dial, hour hand, minute hand and second hand of the assembled movement on the dial placement device, one hour / minute hand placement device, another hour / minute hand placement device and the second hand placement device respectively;

[0022] S2, the lifting drive mechanism drives the needle removal mechanism to press down, so that the first needle removal head grabs the hour hand on the hour hand placement position, the second needle removal head grabs the minute hand on the minute hand placement position, and the second hand tooling grabs the second hand on the second hand placement position;

[0023] S3, the lifting drive mechanism drives the needle removal mechanism to move upward, so that the needle removal mechanism takes the hour hand, minute hand and second hand away from the hour / minute hand placement device and the second hand placement device;

[0024] S4. The horizontal driving mechanism drives the needle removal mechanism to move horizontally, so that the first needle removal head, the second needle removal head and the second hand tooling are moved to the top of the dial placement position in sequence; every time a watch hand is moved to the top of the dial placement position driven by the corresponding tooling, the lifting driving mechanism drives the needle removal mechanism to press down, so that the watch hand is transferred to the mounting column on the dial.

[0025] The automatic watch needle-installing machine and the watch hand assembly method of the present invention respectively carry the dial, hour hand, minute hand and second hand on the dial placer, hour / minute hand placer and second hand placer, and grab and transfer the hour hand, minute hand and second hand through the needle removal mechanism, so that the needle removal mechanism can assemble the hour hand, minute hand and second hand one by one on the mounting column of the dial under the joint action of the lifting drive mechanism and the horizontal drive mechanism, which replaces the manual assembly method of the watch hands and improves the assembly efficiency of the watch hands; in addition, the lifting height of the needle removal mechanism is uniformly controlled by the lifting drive mechanism, which is conducive to controlling the tightness of the watch hands after assembly, thereby improving the consistency of the watch after assembly, so as to facilitate the quality control of the watch. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic cross-sectional structure diagram of an automatic watch needle-installing machine in one embodiment of the present invention;

[0027] Figure 2 It is a structural schematic diagram of a dial placing device in one embodiment of the present invention;

[0028] Figure 3 It is a schematic cross-sectional structure diagram of an hour / minute hand placement device in one embodiment of the present invention;

[0029] Figure 4 A bottom view of an hour / minute hand placement device in one embodiment of the present invention;

[0030] Figure 5 It is a schematic diagram of a half-section structure of the hour / minute hand placement device in a top view in one embodiment of the present invention;

[0031] Figure 6 It is a schematic cross-sectional structure diagram of a second hand placement device in one embodiment of the present invention;

[0032] Figure 7 It is a schematic diagram of a half-section structure of a second hand placement device in a top view in one embodiment of the present invention;

[0033] Figure 8 It is a schematic cross-sectional structure diagram of a positioning mechanism in one embodiment of the present invention;

[0034] Fig. 9 It is a schematic cross-sectional structure diagram of a needle removal mechanism in one embodiment of the present invention;

[0035] Fig.10 a- Fig.10 c is a schematic diagram of the needle removal process of the hour hand in one embodiment of the present invention;

[0036] Fig.11 a- Fig.11 c is a schematic diagram of the needle removal process of the minute needle in one embodiment of the present invention;

[0037] Fig.12 a- Fig.12 c is a schematic diagram of the needle removal process of the second hand in one embodiment of the present invention;

[0038] Fig.13 A bottom view of a second hand tooling in one embodiment of the present invention;

[0039] Figure 14-21 A schematic diagram of a watch automatic needle-fitting machine needle-fitting process in one embodiment of the present invention;

[0040] Fig. 22 The present invention is a flowchart of a method for assembling a watch hand in one embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0042] Please combine Figure 1-21The present invention discloses an automatic watch needle-installing machine with high assembly efficiency and good assembly quality consistency. The automatic watch needle-installing machine includes a placement unit 100, a needle-removing mechanism 200, a horizontal driving mechanism (not shown) and a lifting driving mechanism, wherein the placement unit 100 is arranged on a work surface for receiving a dial and hands to be assembled; the needle-removing mechanism 200 is located above the placement unit 100 and is used for taking and placing the hands; the horizontal driving mechanism and the lifting driving mechanism work together to realize the horizontal movement and lifting of the needle-removing mechanism 200 to shift the position of the hands, thereby assembling the hands onto the dial one by one. Specifically, the placement unit 100 includes a dial placement device 110, two hour / minute hand placement devices 120 and a second hand placement device 130 located beside the dial placement device 110 and arranged at intervals, and a dial placement position is provided on the top of the dial placement device 110, an hour hand placement position is provided on the top of one hour / minute hand placement device 120, a minute hand placement position is provided on the top of the other hour / minute hand placement device 120, and a second hand placement position is provided on the top of the second hand placement device 130. The bottom of the needle removal mechanism 200 is provided with a first needle removal head 210 corresponding to the hour hand placement position and used to grab the hour hand, a second needle removal head 220 corresponding to the minute hand placement position and used to grab the minute hand, and a second hand tooling 230 corresponding to the second hand placement position and used to grab the second hand. The horizontal drive mechanism is used to drive the needle removal mechanism 200 to move horizontally as a whole, so that the first needle removal head 210, the second needle removal head 220 and the second hand fixture 230 are sequentially moved to the top of the dial placement position, thereby realizing the adjustment of the positions of the hour hand 10, the minute hand 20 and the second hand 30 in the horizontal plane. The lifting drive mechanism is used to drive the needle removal mechanism 200 to rise and fall as a whole, so that when the needle removal mechanism 200 descends, the first needle removal head 210 grabs the hour hand 10 on the hour hand placement position, the second needle removal head 220 grabs the minute hand 20 on the minute hand placement position, and the second hand fixture 230 grabs the second hand 30 on the second hand placement position; and when the needle removal mechanism 200 rises, the hour hand 10 and the minute hand 20 are taken away from the hour / minute hand placement device 120, and the second hand 30 is taken away from the second hand placement device 120. The placer 130 is also used to drive the needle removal mechanism 200 to descend after the horizontal driving mechanism drives the needle removal mechanism 200 to move horizontally, so that the hour hand 10, the minute hand 20 and the second hand 30 are sequentially placed on the mounting column 50 of the dial 40 on the dial placement position (the mounting column is actually the dial shaft extending from the center hole of the dial on the movement after the dial and the movement are assembled, and the dial shaft includes three shaft wheels that are coaxially arranged and have different diameters to respectively correspond to the fixed hour hand, minute hand and watch hand). In other words, on the one hand, the lifting drive mechanism drives the hand removing mechanism 200 to rise and fall, so that the hand removing mechanism 200 grabs the hour hand 10, minute hand 20 and second hand 30 from the hour / minute hand placer 120 and the second hand placer 130; on the other hand, the lifting drive mechanism drives the hand removing mechanism 200 to descend, so that the hand removing mechanism 200 after horizontal movement installs the hour hand 10, minute hand 20 or second hand 30 on the dial 40 on the dial placer 110, thereby realizing the automatic assembly of the hands.

[0043] It should be noted that, in the present embodiment, the hour hand placement position, the minute hand placement position and the second hand placement position are at the same horizontal height, so that when the needle removal mechanism 200 is descending, it can simultaneously grab the hour hand 10, the minute hand 20 and the second hand 30 from the hour / minute hand placement device 120 and the second hand placement device 130; the horizontal height of the dial placement position is higher than the horizontal heights of the hour hand placement position, the minute hand placement position and the second hand placement position. In this way, when the needle removal mechanism 200 is pressed down and the hour hand 10, the minute hand 20 or the second hand 30 is installed on the dial 40, a space is reserved between the bottom of the needle removal mechanism 200 and the hour hand placement position, the minute hand placement position and the second hand placement position, so as to avoid the needle removal mechanism 200 hitting the hour / minute hand placement device 120 and the second hand placement device 130, thereby causing damage to the needle removal mechanism 200, the hour / minute hand placement device 120 and the second hand placement device 130, thereby ensuring the safety of the operation.

[0044] The dial placement device 110 is used to receive the dial 40 to be assembled with the hands after being assembled with the movement, so as to provide a place for assembling the dial and the hands. In one embodiment, the dial placement device 110 includes a first vacuum suction seat 111, a first vacuum air pipe 112 installed at the bottom or side of the first vacuum suction seat 111 and connected to an external air pressure device, a first vacuum air channel 113 connected to the first vacuum air pipe 112 is provided in the first vacuum suction seat 111, and an air suction groove 114 connected to the first vacuum air channel 113 is opened on the top surface of the first vacuum suction seat 111, and the air suction groove 114 and the notch edge of the air suction groove 114 together form a dial placement position. In this embodiment, the air suction groove 114 is used to provide the first vacuum suction seat 111 with an adsorption area for the dial and movement assembly, and on the other hand, the air suction groove 114 is also used to accommodate the movement. In other words, when the assembly of the dial and the movement is placed on the first vacuum suction seat 111, the movement is located in the suction groove 114, the axis of the movement passes through the center hole of the dial and forms a mounting column 50 above the dial 40, and the portion of the lower surface of the dial 40 protruding from the movement is against the notch edge of the suction groove 114. In this way, when the first vacuum air pipe 112 is connected to the external air pressure device, negative pressure is formed in the suction groove 114, and the negative pressure acts on the lower surface of the dial 40, so that the dial 40 is adsorbed and fixed on the first vacuum suction seat 111. In addition, a sealing ring is provided at the notch edge of the suction groove 114 to prevent air leakage in the gap between the lower surface of the dial 40 and the notch edge of the suction groove 114, thereby improving the stability of the dial positioning. In addition, a first groove 115 is opened on the lower surface of the first vacuum suction seat 111, and a first air pipe bolt 116 is sealed and fixed in the first groove 115. The first air pipe bolt 116 is fixedly connected and communicated with the first vacuum air pipe 112, and the connecting portion between the first air pipe bolt 116 and the first vacuum air pipe 112 is sealed to realize the connection between the first vacuum air pipe 112 and the first vacuum suction seat 111.

[0045] The hour / minute hand placement device 120 can be used to load the hour hand alone or the minute hand alone. The hour / minute hand placement device 120 includes a first base 121, a first needle placement groove 122 is provided in the middle of the top surface of the first base 121, a first needle head 123 is accommodated in the first needle placement groove 122, the bottom of the first needle head 123 is elastically connected to the bottom surface of the first needle placement groove 122, the top of the first needle head 123 extends out of the first needle placement groove 122 and forms a first needle portion for sleeve-fitting the hour hand 10 or the minute hand 20, and a limiting space 124 for inserting the annular protrusion at the lower edge of the installation hole of the hour hand 10 or the minute hand 20 is formed between the annular side surface of the first needle portion and the inner side surface of the first needle placement groove 122. When the hour hand 10 or minute hand 20 is placed on the hour / minute hand placement device 120, the annular protrusion at the lower edge of the installation hole of the hour hand 10 or minute hand 20 is inserted into the limiting space 124 and abuts against the annular side surface of the first needle sleeve portion and the inner side surface of the first needle placement groove 122, thereby limiting the hour hand 10 or minute hand 20 to prevent the hour hand 10 or minute hand 20 from shaking on the hour / minute hand placement device 120. Preferably, the bottom of the first needle sleeve 123 is connected to the bottom surface of the first needle placement groove 122 via a compression spring 125.

[0046] Further, the top edge of the first needle sleeve portion is provided with a rounded corner so that a conical plug-in area 126 is formed between the inner wall of the mounting hole of the hour hand 10 or the minute hand 20 and the top edge of the first needle sleeve portion. The first needle removal head 210 is an annular structure, and the bottom of the first needle removal head 210 is bent in a direction away from the axis of the first needle removal head 210 to form a first needle removal portion, and the first needle removal portion is inserted into the conical plug-in area 126 when the first needle removal head 210 is pressed down, so that the inner wall of the mounting hole of the hour hand 10 and the outer ring side of the first needle removal portion are interference fit. The second needle removal head 220 is an annular structure, and the bottom of the second needle removal head 220 is bent in a direction away from the axis of the second needle removal head 220 to form a second needle removal portion, and the second needle removal portion is inserted into the conical plug-in area 126 when the second needle removal head 220 is pressed down, so that the inner wall of the mounting hole of the minute hand 20 and the outer ring side of the second needle removal portion are interference fit. It can be understood that the structure of the first needle removal head 210 is the same as that of the second needle removal head 220. During the process of removing the hour hand 10, the needle removal mechanism 200 drives the first needle removal head 210 to move vertically downward. When the first needle removal portion of the first needle removal head 210 is inserted into the conical insertion area 126, as the first needle removal head 210 is pressed downward, the first needle removal portion presses the first set of needle heads 123, so that the compression spring 125 is compressed, and the first set of needle heads 123 moves downward under the drive of the compression spring 125. At the same time, the first needle removal portion and the inner wall of the mounting hole of the hour hand 10 are squeezed tightly, and the two are interference fit. In this way, during the process of the first needle removal portion and the hour hand 10 interference fit and the first set of needle heads 123 following the compression spring 125 to be pressed downward, the buffering effect of the spring is used to separate the hour hand 10 from the first set of needle heads 123, and then the needle removal mechanism 200 drives the first needle removal head 210 to lift, so that the first needle removal portion grabs the hour hand. Similarly, in the process of removing the minute hand 20, the needle removal mechanism 200 drives the second needle removal head 220 to move vertically downward. When the second needle removal portion of the second needle removal head 220 is inserted into the conical insertion area 126, as the second needle removal head 220 is pressed down, the second needle removal portion presses the first set of needle heads 123, so that the compression spring 125 is compressed, and the first set of needle heads 123 moves downward under the drive of the compression spring 125. At the same time, the second needle removal portion and the inner wall of the mounting hole of the minute hand 20 are squeezed tightly, and the two are interference fit. In this way, in the process of the second needle removal portion and the minute hand 20 interference fit and the first set of needle heads 123 following the compression spring 125 to be pressed down, the buffering effect of the spring is used to separate the minute hand 20 from the first set of needle heads 123, and then the needle removal mechanism 200 drives the second needle removal head 220 to lift, so that the second needle removal portion grabs the minute hand 20.

[0047] In one embodiment, the bottom surface of the needle removal mechanism 200 is provided with a first installation groove 240, a second installation groove 250 and a third installation groove 260 which are spaced apart from each other. A table axis positioning member 241 is fixed in the first installation groove 240. The bottom surface of the table axis positioning member 241 is provided with a avoiding groove 242 which is adapted to the shape of the mounting column 50 on the dial 40, so as to avoid the bottom of the needle removal mechanism 200 from hitting the dial 40 on the dial placement device 110 during the pressing process of the needle removal mechanism 200, thereby preventing the dial 40 from being damaged. The inner wall of the second installation groove 250 is provided with a first needle pressing tube 251 extending from the notch of the second installation groove 250 at a position adjacent to the notch of the second installation groove 250. The first needle removal head 210 is accommodated in the second installation groove 250 and cooperates with the first needle pressing tube 251 for sliding and limiting, and the top of the first needle removal head 210 is elastically connected to the top surface of the groove of the second installation groove 250 through a first spring 252. Preferably, the first needle head 210 is provided with a first step 211 that matches the top of the first pressure needle tube 251 (the end of the first pressure needle tube 251 that is located in the second installation groove 250) in a concave-convex manner, so that the first needle head 210 can be prevented from falling off from the notch of the second installation groove 250, and the maximum distance that the first needle head 210 moves downward in the second installation groove 250 under the push of the first spring 252 can be limited to avoid the first needle head 210 being damaged due to the impact of the first needle head 210 on the hour / minute hand placement device 120. The inner wall of the third installation groove 260 is provided with a second pressure needle tube 261 that extends from the notch of the third installation groove 260 at a position adjacent to the notch of the third installation groove 260, and the second needle head 220 is accommodated in the third installation groove 260 and matches the second pressure needle tube 261 in a sliding limit position, and the top of the second needle head 220 is elastically connected to the top surface of the third installation groove 260 through the second spring 262. Preferably, a portion of the second needle removal head 220 located in the third mounting groove 260 is provided with a second step portion 221 that is concave-convexly matched with the top end of the second needle pressing tube 261 (the end of the second needle pressing tube 261 located in the third mounting groove 260). In this way, the second needle removal head 220 can be prevented from falling off from the notch of the third mounting groove 260, and the maximum distance that the second needle removal head 220 can move downward in the third mounting groove 260 under the push of the second spring 262 can be limited, so as to avoid the second needle removal head 220 being damaged due to the second needle removal head 220 impacting the hour / minute hand placer 120.

[0048] In this embodiment, by setting the first spring 252 in the second mounting groove 250, during the installation of the hour hand 10, when the needle removal mechanism 200 drives the first needle removal head 210 and the hour hand 10 to be pressed down, after the bottom of the first needle pressing tube 251 contacts the mounting column 50, the first needle pressing tube 251 maintains a constant height under the restriction of the mounting column 50. As the needle removal mechanism 200 is pressed down, the first spring 252 is compressed, so that the first needle removal head 210 moves toward the direction close to the notch of the second mounting groove 250 under the drive of the first spring 252, and at the same time, the first needle pressing tube 251 presses the hour hand 10 downward. In this way, while the first needle removal head 210 rises under the pull of the first spring 252, the bottom of the first needle pressing tube 251 squeezes and limits the hour hand 10, thereby separating the first needle removal head 210 from the hour hand 10 and firmly fixing the hour hand 10 on the mounting column 50 of the dial 40. By arranging the second spring 262 in the third mounting groove 260, during the process of installing the minute hand 20, when the needle removal mechanism 200 drives the second needle removal head 220 and the minute hand 20 to be pressed down, after the bottom of the second needle pressing tube 261 contacts the mounting column 50, the second needle pressing tube 261 maintains a constant height under the restriction of the mounting column 50. As the needle removal mechanism 200 is pressed down, the second spring 262 is compressed, so that the second needle removal head 220 moves toward the direction close to the notch of the third mounting groove 260 under the drive of the second spring 262, and at the same time, the second needle pressing tube 261 presses the minute hand 20 downward. In this way, while the second needle removal head 220 rises under the pull of the second spring 262, the bottom of the second needle pressing tube 261 squeezes and limits the minute hand 20, thereby separating the second needle removal head 220 from the minute hand 20 and firmly fixing the minute hand 20 on the mounting column 50 of the dial 40.

[0049] The second hand placement device 130 is used to load the second hand to be assembled on the dial. The second hand placement device 130 includes a second base 131, a second needle placement groove 132 is provided in the middle of the top surface of the second base 131, a second needle head 133 is fixed in the second needle placement groove 132, and the top of the second needle head 133 extends out of the second needle placement groove 132 and forms a second needle portion for sleeve-mounting the second hand 30. Preferably, the second needle head 133 and the second base 131 are integrally formed. A vent hole 270 is provided on the needle removal mechanism 200 beside the third mounting groove 260, which penetrates the top and bottom surfaces of the needle removal mechanism 200. The top of the vent hole 270 is connected to an external air pressure device. The second hand fixture 230 is accommodated in the vent hole 270 and is adjacent to the lower end opening of the vent hole 270. The outer annular surface of the second hand fixture 230 is sealed and connected to the inner wall of the vent hole 270. A second avoidance hole 231 for accommodating the second set of needles 133 is provided in the middle of the bottom surface of the second hand fixture 230, and an air suction hole 232 is provided beside the second avoidance hole 231 and connected to the vent hole 270 so that the second hand fixture 230 can absorb the second hand. The vent hole 270 is connected to an external positive pressure device and a negative pressure device respectively, and a solenoid valve is provided on the pipelines connecting the vent hole 270 with the positive pressure device and the negative pressure device respectively to control the air flow into the vent hole 270. In this embodiment, a second shaft 301 is also fixed on the second hand 30 to be assembled, and a groove 302 is provided in the middle of the bottom surface of the second shaft 301. The second shaft 301 is used to pass through the hour hand 10 and the minute hand 20 when the second hand 30 is assembled, so that the second hand 30 is connected to the movement. Specifically, during the needle removal process of the second hand 30, the needle removal mechanism 200 drives the second hand fixture 230 to descend, and at the same time, the vent 270 is connected to the external negative pressure device, so that negative pressure is formed at the suction hole 232 at the bottom of the second hand fixture 230. When the second hand fixture 230 descends until the second hand 30 enters the negative pressure absorption area of ​​the second hand fixture 230, the second hand 30 is tightly attached to the bottom surface of the second hand fixture 230 under the action of the negative pressure. As the needle removal mechanism 200 rises, the second hand 30 is separated from the second set of needle parts under negative pressure adsorption, thereby completing the needle removal operation of the second hand 30. When the needle removal mechanism 200 moves driven by the horizontal driving mechanism and the second hand fixture 230 moves to the bottom of the dial placer 110, the needle removal mechanism 200 is pressed down, and the second hand fixture 230 is close to and aligned with the dial 40, and then the vent 270 and the channel of the negative pressure device are closed, and at the same time, the vent 270 and the channel of the positive pressure device are opened, so that positive pressure is generated at the suction hole 232, so that the second hand 30 is tightly pressed on the mounting column 50 on the dial 40 under the push of the positive pressure, thereby completing the assembly of the second hand 30.

[0050] Furthermore, a first positioning guide groove 127 is provided on the top surface of the first base 121 beside the first needle placement groove 122, a first positioning platform 128 is provided in the first positioning guide groove 127, a first positioning bolt 129 is passed through the first positioning platform 128 and the groove wall of the first positioning guide groove 127 and is threadedly connected to the first positioning platform 128 and the first positioning guide groove 127, the side surface of the first positioning platform 128 is slidably matched with the side wall of the first positioning guide groove 127, and a first clamping groove 1281 for clamping the hour hand 10 or the minute hand 20 is provided on the top surface of the first positioning platform 128, and the first positioning bolt 129 is rotated to adjust the position of the first positioning platform 128 in the first positioning guide groove 127. A second positioning guide groove 134 is provided on the top surface of the second base 131 beside the second needle placement groove 132, a second positioning platform 135 is provided in the second positioning guide groove 134, a second positioning bolt 136 is passed through the groove wall of the second positioning platform 135 and the second positioning guide groove 134 and is threadedly connected to the second positioning platform 135 and the second positioning guide groove 134, the side surface of the second positioning platform 135 is slidably matched with the side wall of the second positioning guide groove 134, and a second clamping groove 1351 for clamping the second hand is provided on the top surface of the second positioning platform 135, and the second positioning bolt 136 is rotated to adjust the position of the second positioning platform 135 in the second positioning guide groove 134. The first positioning guide groove 127 is used to limit the rotation of the first positioning platform 128, so that the first positioning platform 128 can only move along the first positioning guide groove 134 under the drive of the first positioning bolt 129; the second positioning guide groove 134 is used to limit the rotation of the second positioning platform 135, so that the second positioning platform 135 can only move along the second positioning guide groove 134 under the drive of the second positioning bolt 136. In this embodiment, the direction in which the horizontal driving mechanism drives the needle removal mechanism 200 to move in the horizontal plane to approach or move away from the dial placement device 110 is set as the X-axis direction. By providing the first positioning platform 128, the position of the first positioning platform 128 in the first positioning guide groove 127 can be adjusted by rotating the first positioning bolt 129, thereby adjusting the angle of the hour hand 10 or the minute hand 20 deviating from the X-axis in the plane with the first needle groove 122 as the center; similarly, by providing the second positioning platform 135, the position of the second positioning platform 135 in the second positioning guide groove 134 can be adjusted by rotating the second positioning bolt 136, thereby adjusting the angle of the second hand 30 deviating from the X-axis in the plane with the second needle groove 132 as the center. In this way, the hour hand 10, the minute hand 20 and the second hand 30 can be always grasped and installed on the dial 40 at the same deviation angle in different batches of assembly operations, so that the position of the hour hand 10, the position of the minute hand 20 and the position of the second hand 30 on each dial 40 after final assembly are consistent, so as to improve the consistency of the assembled products.

[0051] In addition, in order to realize the positioning of the second hand placer 130 and the hour / minute hand placer 120, in one embodiment, the second hand placer 130 and the hour / minute hand placer 120 are fixed on the work surface by screws. In another embodiment, the placement unit 100 also includes three positioning mechanisms 140 that are used to receive the second hand placer 130 and the two hour / minute hand placers 120. The positioning mechanism 140 includes a second vacuum suction seat 141, a second vacuum air pipe 142 installed at the bottom or side of the second vacuum suction seat 141 and connected to an external air pressure device, a second vacuum air channel 143 that is connected to the second vacuum air pipe 142 and passes through the top surface of the second vacuum suction seat 141 is provided in the second vacuum suction seat 141, at least two positioning holes 144 are opened on the top surface of the second vacuum suction seat 141, the bottom of the first base 121 is provided with at least two first positioning columns 1211 that are inserted into each positioning hole 144 in a one-to-one correspondence, and the bottom of the second base 131 is provided with a one-to-one correspondence Inserted into each positioning At least two second positioning columns 1311 are provided in the positioning hole 144. Thus, after the first base 121 is pre-positioned by the first positioning column 1211, the first base 121 is firmly attached to the second vacuum seat 141 under the action of the negative pressure at the outlet of the second vacuum air passage 143, so as to realize the positioning of the hour / minute hand placement device 120; after the second base 131 is pre-positioned by the second positioning column 1311, the second base 131 is firmly attached to the second vacuum seat 141 under the action of the negative pressure at the outlet of the second vacuum air passage 143, so as to realize the positioning of the second hand placement device 130. Preferably, two first positioning columns 1211 are symmetrically provided at the bottom of the first base 121 to prevent the first base 121 from rotating on the second vacuum seat 141, and two second positioning columns 1311 are symmetrically provided at the bottom of the second base 131 to prevent the second base 131 from rotating on the second vacuum seat 141. Further preferably, a second groove 145 is opened on the lower surface of the second vacuum suction seat 141, and a second air pipe bolt 146 is sealed and fixed in the second groove 145. The second air pipe bolt 146 is fixedly connected and communicated with the second vacuum air pipe 142, and the connecting part between the second air pipe bolt 146 and the second vacuum air pipe 142 is sealed to realize the connection between the second vacuum air pipe 142 and the second vacuum suction seat 141.

[0052] The horizontal driving mechanism is used to drive the needle removal mechanism 200 to move along the X-axis to adjust the positions of the first needle removal head 210, the second needle removal head 220 and the second hand fixture 230 relative to the dial placement device 110. In one embodiment, the horizontal driving mechanism is a linear module or a pneumatic push rod mechanism that drives the needle removal mechanism 200 and the lifting driving mechanism to move in the horizontal direction as a whole. The lifting driving mechanism and the needle removal mechanism 200 are accommodated in a box with an opening at the bottom. The lifting driving mechanism is fixedly connected to the inner wall of the box and drives the needle removal mechanism 200 to rise and fall. The movable end of the horizontal driving mechanism is fixedly connected to the box to drive the box and the lifting driving mechanism and the needle removal mechanism 200 in the box to move in the horizontal direction. The components at the bottom of the needle removal mechanism 200 are exposed through the opening at the bottom of the box to grab the hour hand, minute hand and second hand. Of course, in actual operation, in order to improve the stability of the horizontal movement of the needle removal mechanism 200, a hanging rail can also be set above the box, and the top of the box is connected to the hanging rail through a hook that cooperates with the sliding limit of the hanging rail to reduce the load of the horizontal driving mechanism.

[0053] In one embodiment, the lifting drive mechanism is a pneumatic cylinder or an electric cylinder, and the telescopic end of the lifting drive mechanism is fixedly connected to the top of the needle removal mechanism 200. In this way, by extending or retracting the telescopic end of the lifting drive mechanism, the needle removal mechanism 200 can be driven to move via its telescopic end to achieve the descent or ascent of the needle removal mechanism 200. In another embodiment, the lifting drive mechanism includes a needle pressing shaft 300 drivingly connected to an external telescopic drive member and a third spring (not shown) fixedly connected to an external frame and the top of the needle removal mechanism 200, respectively. The needle pressing shaft 300 is driven by the external telescopic drive member to push the needle removal mechanism 200 to descend or leave the needle removal mechanism 200. In other words, the needle pressing shaft 300 of the lifting drive mechanism pushes the needle removal mechanism 200 to descend only when it descends to contact with the top of the needle removal mechanism 200. When the needle removal mechanism 200 rises, it is only necessary to control the needle pressing shaft 300 of the lifting drive mechanism to rise. The force of the needle pressing shaft 300 on the needle removal mechanism 200 is reduced until it is eliminated. In this process, the needle removal mechanism 200 is reset under the drive of the third spring, thereby realizing the automatic rise of the needle removal mechanism 200.

[0054] The present invention also discloses a method for assembling watch hands using the above-mentioned automatic watch needle assembling machine. The structure and working principle of the automatic watch needle assembling machine used in the method for assembling watch hands are the same as those of the automatic watch needle assembling machine described above. For details, please refer to the above description and will not be repeated here. Figure 1-22 The needle assembly method of this embodiment includes the following steps:

[0055] S1. Place the dial, hour hand, minute hand and second hand of the assembled movement on the dial placement device 110, one hour / minute hand placement device 120, another hour / minute hand placement device 120 and the second hand placement device 130 respectively.

[0056] S2. The lifting drive mechanism drives the needle removal mechanism 200 to press down, so that the first needle removal head 210 grabs the hour hand at the hour hand placement position, the second needle removal head 220 grabs the minute hand at the minute hand placement position, and the second hand tooling 230 grabs the second hand at the second hand placement position.

[0057] S3, the lifting drive mechanism drives the needle removal mechanism 200 to move upward, so that the needle removal mechanism 200 takes the hour hand, minute hand and second hand away from the hour / minute hand placement device 120 and the second hand placement device 130.

[0058] S4. The horizontal driving mechanism drives the needle removal mechanism 200 to move horizontally, so that the first needle removal head 210, the second needle removal head 220 and the second hand tooling 230 move to the top of the dial placement position in sequence; every time a watch hand moves to the top of the dial placement position driven by the corresponding tooling, the lifting driving mechanism drives the needle removal mechanism 200 to press down, so that the watch hand is transferred to the mounting column on the dial.

[0059] Specifically, first place the dial with the movement assembled on the dial placer 110, place the hour hand on the hour / minute hand placer 120 adjacent to the dial placer 110, place the minute hand on another hour / minute hand placer 120, place the second hand on the second hand placer 130, put the ends of the hour hand, minute hand and second hand into the corresponding clamping grooves, and adjust the first positioning bolt 129 and the second positioning bolt 136 respectively to adjust the angles of the hour hand, minute hand and second hand relative to the X-axis. Then start the power supply, the needle pressing shaft 300 descends, and when the bottom of the needle pressing shaft 300 contacts the top of the needle taking mechanism 200, the needle pressing shaft 300 drives the needle taking mechanism 200 to move downward as a whole. When the needle removal mechanism 200 is driven by the needle pressing shaft 300 to descend until the first needle pressing tube 251 contacts the hour hand and the second needle pressing tube 261 contacts the minute hand, the first needle removal head 210 and the second needle removal head 220 squeeze the first needle removal part, the first needle removal part of the first needle removal head 210 is inserted into the conical plug-in area 126 and has an interference fit with the hour hand, the second needle removal part of the second needle removal head 220 is inserted into the conical plug-in area 126 and has an interference fit with the minute hand, and the second hand tooling 230 absorbs the second hand through negative pressure. Then the needle pressing shaft 300 is controlled to rise, and the needle removal mechanism 200 rises driven by the third spring, so that the hour hand, minute hand and second hand are separated from the corresponding placement device respectively.

[0060] When the needle removal mechanism 200 returns to its initial height, the horizontal drive mechanism controls the needle removal mechanism 200 to move horizontally to the left until the first needle removal head 210 drives the hour hand to move above the dial. At this time, the needle removal mechanism 200 is pressed down again by the needle pressing shaft 300, and the first needle removal head 210 is separated from the hour hand by the action of the first spring 252 on the first needle removal head 210 and the action of the first needle pressing tube 251 on the hour hand, and the hour hand is firmly installed on the installation column of the dial. Then the needle pressing shaft 300 is controlled to rise, and the needle removal mechanism 200 rises and returns to its initial height driven by the third spring to complete the installation of the hour hand.

[0061] Subsequently, the horizontal drive mechanism controls the needle removal mechanism 200 to continue to move horizontally to the left until the second needle removal head 220 drives the minute hand to move above the dial. At this time, the needle removal mechanism 200 is pressed down again by the needle pressing shaft 300, and the second needle removal head 220 is separated from the minute hand by the action of the second spring 262 on the second needle removal head 220 and the action of the second needle pressing tube 261 on the minute hand, and the minute hand is firmly installed on the installation column of the dial. Subsequently, the needle pressing shaft 300 is controlled to rise, and the needle removal mechanism 200 rises and returns to the initial height driven by the third spring to complete the installation of the minute hand.

[0062] Finally, the horizontal drive mechanism controls the needle removal mechanism 200 to move further to the left horizontally until the second hand tooling 230 drives the second hand to move above the dial. At this time, the needle removal mechanism 200 is pressed down again by the needle pressing shaft 300, and the second hand is fixed on the installation column of the dial by the positive pressure gas passing into the vent 270. Then the needle pressing shaft 300 is controlled to rise, and the needle removal mechanism 200 rises and returns to the initial height driven by the third spring to complete the installation of the second hand.

[0063] The automatic watch needle-installing machine and the watch hand assembly method of the present invention are implemented by respectively carrying the dial, hour hand, minute hand and second hand on the dial placer 110, the hour / minute hand placer 120 and the second hand placer 130, and grabbing and transferring the hour hand, minute hand and second hand through the needle removal mechanism 200, so that the needle removal mechanism 200 assembles the hour hand, minute hand and second hand one by one on the mounting column of the dial under the joint action of the lifting drive mechanism and the horizontal drive mechanism, which replaces the manual assembly method of the watch hands and improves the assembly efficiency of the watch hands; in addition, the lifting height of the needle removal mechanism 200 is uniformly controlled by the lifting drive mechanism, which is conducive to controlling the tightness of the watch hands after assembly, thereby improving the consistency of the watch after assembly, so as to facilitate the quality control of the watch.

[0064] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A watch automatic needle-installing machine, characterized in that: include: A placement unit, the placement unit comprising a dial placement device, two hour / minute hand placement devices and a second hand placement device located beside the dial placement device and arranged at intervals, the dial placement device having a dial placement position on the top, an hour / minute hand placement device having an hour hand placement position on the top, a minute hand placement position on the top of the other hour / minute hand placement device, and a second hand placement device having a second hand placement position on the top; The needle taking mechanism is located above the placement unit, and the bottom of the needle taking mechanism is provided with a first needle taking head corresponding to the hour hand placement position and used to grab the hour hand, a second needle taking head corresponding to the minute hand placement position and used to grab the minute hand, and a second hand tooling corresponding to the second hand placement position and used to grab the second hand; A horizontal driving mechanism, which is used to drive the entire needle removal mechanism to move horizontally, so that the first needle removal head, the second needle removal head and the second hand tooling are moved to the top of the dial placement position in sequence; and A lifting drive mechanism, the lifting drive mechanism is used to drive the needle taking mechanism to lift and lower as a whole, so that when the needle taking mechanism descends, the first needle taking head grabs the hour hand on the hour hand placement position, the second needle taking head grabs the minute hand on the minute hand placement position, and the second hand on the second hand placement position through the second hand tooling; and when the needle taking mechanism rises, the hour hand and minute hand are taken away from the hour / minute hand placer, and the second hand is taken away from the second hand placer; it is also used to drive the needle taking mechanism to descend after the horizontal driving mechanism drives the needle taking mechanism to move horizontally, so that the hour hand, minute hand and second hand are placed in sequence on the mounting column of the dial on the dial placement position.

2. The automatic watch needle-installing machine according to claim 1, characterized in that: The dial placer includes a first vacuum suction seat, a first vacuum air pipe installed at the bottom or side of the first vacuum suction seat and connected to an external air pressure device, a first vacuum air channel connected to the first vacuum air pipe is provided in the first vacuum suction seat, and an air suction groove connected to the first vacuum air channel is opened on the top surface of the first vacuum suction seat, and the air suction groove and the notch edge of the air suction groove together form the dial placement position.

3. The automatic watch needle-installing machine according to claim 1, characterized in that: The hour / minute hand placement device includes a first base, a first needle placement groove is provided in the middle of the top surface of the first base, a first needle head is accommodated in the first needle placement groove, the bottom of the first needle head is elastically connected to the bottom surface of the first needle placement groove, the top of the first needle head extends out of the first needle placement groove and forms a first needle portion for sleeve-connecting the hour hand or the minute hand, and a limiting space for inserting the annular protrusion at the lower edge of the hour hand or the minute hand installation hole is formed between the annular side surface of the first needle portion and the inner side surface of the first needle placement groove.

4. The automatic watch needle-installing machine according to claim 3, characterized in that: The bottom surface of the needle removal mechanism is provided with a first mounting groove, a second mounting groove and a third mounting groove distributed at intervals, a watch axis positioning piece is fixed in the first mounting groove, and a avoidance groove adapted to the shape of the mounting column on the dial is provided on the bottom surface of the watch axis positioning piece; the inner wall of the second mounting groove is provided with a first needle pressure tube extending from the notch of the second mounting groove at a position adjacent to the notch of the second mounting groove, the first needle removal head is accommodated in the second mounting groove and cooperates with the first needle pressure tube for sliding limitation, and the top of the first needle removal head is elastically connected to the top surface of the groove of the second mounting groove through a first spring; the inner wall of the third mounting groove is provided with a second needle pressure tube extending from the notch of the third mounting groove at a position adjacent to the notch of the third mounting groove, the second needle removal head is accommodated in the third mounting groove and cooperates with the second needle pressure tube for sliding limitation, and the top of the second needle removal head is elastically connected to the top surface of the groove of the third mounting groove through a second spring.

5. The automatic watch needle-installing machine according to claim 4, characterized in that: The top edge of the first needle sleeve portion is provided with a rounded corner so that a tapered insertion area is formed between the inner wall of the mounting hole of the hour hand or the minute hand and the top edge of the first needle sleeve portion; The first needle removal head is annular in structure, the bottom of the first needle removal head is bent in a direction away from the axis of the first needle removal head to form a first needle removal portion, and the first needle removal portion is inserted into the conical insertion area when the first needle removal head is pressed down, so that the inner wall of the mounting hole of the hour hand and the outer ring side of the first needle removal portion are interference fit; The second needle removal head has an annular structure, and the bottom of the second needle removal head is bent in a direction away from the axis of the second needle removal head to form a second needle removal part. When the second needle removal head is pressed down, the second needle removal part is inserted into the conical insertion area so that the inner wall of the mounting hole of the minute hand is interference fit with the outer ring side of the second needle removal part.

6. The automatic watch needle-installing machine according to claim 3, characterized in that: The second hand placement device includes a second base, a second needle placement groove is provided in the middle of the top surface of the second base, a second needle head is fixed in the second needle placement groove, the top of the second needle head extends out of the second needle placement groove and forms a second needle part for receiving the second hand; a vent hole penetrating the top and bottom surfaces of the needle removal mechanism is provided on the needle removal mechanism beside the third installation groove, the top of the vent hole is connected with an external air pressure device, the second hand tooling is accommodated in the vent hole and adjacent to the lower end opening of the vent hole, the outer annular surface of the second hand tooling is sealed and connected with the inner wall of the vent hole, a second avoidance hole for accommodating the second needle head and an air suction hole located beside the second avoidance hole and connected with the vent hole so that the second hand tooling absorbs the second hand are provided in the middle of the bottom surface of the second hand tooling.

7. The automatic watch needle-installing machine according to claim 6, characterized in that: A first positioning guide groove is provided on the top surface of the first base beside the first needle placement groove, a first positioning platform, a first positioning bolt passing through the first positioning platform and the groove wall of the first positioning guide groove and threadedly connected with the first positioning platform and the first positioning guide groove are provided in the first positioning guide groove, a side surface of the first positioning platform is slidably matched with the side wall of the first positioning guide groove, a first clamping groove for clamping the hour hand or the minute hand is provided on the top surface of the first positioning platform, and the first positioning bolt is rotated to adjust the position of the first positioning platform in the first positioning guide groove; A second positioning guide groove is provided on the top surface of the second base beside the second needle placement groove, a second positioning platform, a second positioning bolt passing through the second positioning platform and the groove wall of the second positioning guide groove and threadedly connected to the second positioning platform and the second positioning guide groove are provided in the second positioning platform, the side surface of the second positioning platform is slidably matched with the side wall of the second positioning guide groove, a second clamping groove for clamping the second hand is provided on the top surface of the second positioning platform, and the second positioning bolt is rotated to adjust the position of the second positioning platform in the second positioning guide groove.

8. The automatic watch needle-installing machine according to claim 6, characterized in that: The placement unit also includes three positioning mechanisms that are used to receive the second hand placer and the two hour / minute hand placers in a one-to-one manner. The positioning mechanisms include a second vacuum suction seat, a second vacuum air pipe installed at the bottom or side of the second vacuum suction seat and connected to an external air pressure device, a second vacuum air channel connected to the second vacuum air pipe and running through the top surface of the second vacuum suction seat is provided in the second vacuum suction seat, at least two positioning holes are opened on the top surface of the second vacuum suction seat, at least two first positioning columns that are inserted into the positioning holes in a one-to-one correspondence are provided at the bottom of the first base, and at least two second positioning columns that are inserted into the positioning holes in a one-to-one correspondence are provided at the bottom of the second base.

9. The automatic watch needle-installing machine according to claim 1, characterized in that: The lifting drive mechanism is a pneumatic cylinder or an electric cylinder, and the telescopic end of the lifting drive mechanism is fixedly connected to the top of the needle removal mechanism; or the lifting drive mechanism includes a needle pressing shaft driven by an external telescopic drive member and a third spring respectively fixedly connected to the external frame and the top of the needle removal mechanism, and the needle pressing shaft pushes the needle removal mechanism to descend or leave the needle removal mechanism under the drive of the external telescopic drive member.

10. A method for assembling watch hands using the automatic watch hand assembling machine according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Place the dial, hour hand, minute hand and second hand of the assembled movement on the dial placement device, one hour / minute hand placement device, another hour / minute hand placement device and the second hand placement device respectively; S2, the lifting drive mechanism drives the needle removal mechanism to press down, so that the first needle removal head grabs the hour hand on the hour hand placement position, the second needle removal head grabs the minute hand on the minute hand placement position, and the second hand tooling grabs the second hand on the second hand placement position; S3, the lifting drive mechanism drives the needle removal mechanism to move upward, so that the needle removal mechanism takes the hour hand, minute hand and second hand away from the hour / minute hand placement device and the second hand placement device; S4. The horizontal driving mechanism drives the needle removal mechanism to move horizontally, so that the first needle removal head, the second needle removal head and the second hand tooling are moved to the top of the dial placement position in sequence; every time a watch hand is moved to the top of the dial placement position driven by the corresponding tooling, the lifting driving mechanism drives the needle removal mechanism to press down, so that the watch hand is transferred to the mounting column on the dial.

Images