Blow-type threading tool

Abstract

A blow-type threading tool includes a housing having a blow port, a motor, a fan and a tape reel arranged in the housing, and a tape and a guide block, a main body portion of the tape being wound on the tape reel, a terminal end being led out by the tape reel and connected to the guide block, the fan being driven by the motor, in a non-working state of the blow-type threading tool, the guide block being held at the blow port, when the blow-type threading tool is activated and the motor is positively rotated, the motor drives the fan to blow through the blow port to push the guide block to move in a direction away from the housing.

Description

TECHNICAL FIELD

[0001] The present application relates to a blowing type threading tool for threading operation in building wiring. BACKGROUND

[0002] When cabling (wiring, signal line, etc.) in a building, a threading pipe is often used. An operator buries the threading pipe in a slot opened in a wall or floor, then threads a wire through the threading pipe, and fixes one end of the cable to one end of the wire. The cable is pulled into the threading pipe by pulling the wire from the other end, thus realizing the threading operation. This manual operation scheme using the wire for threading is time-consuming and troublesome.

[0003] According to an improved prior art, a threading tool is used to realize the threading operation. The threading tool includes a rotatable wire reel, on which a wire more flexible than the wire is wound. The wire is sent out and retracted from the wire reel by manually rotating the wire reel, or by rotating a pair of rubber wheels driven by an electric motor. Compared with the above-described wire threading scheme, this scheme using the wire reel simplifies the operation, but when the wire is sent through the threading pipe, the wire is easily stuck in the threading pipe due to its flexibility, especially when the threading pipe has a corner. In this case, the wire needs to be retracted and the sending operation needs to be re-executed, so the success rate of the sending operation is low. SUMMARY

[0004] An object of the present application is to provide an improved threading tool that facilitates the threading operation and has a high working speed and success rate.

[0005] To this end, the present application provides, in one aspect thereof, a blowing type threading tool, comprising:

[0006] a housing having a blowing port;

[0007] a motor, a fan and a wire reel arranged in the housing; and

[0008] a wire and a guide block, a main body portion of the wire being wound on the wire reel, and a terminal end being led out of the wire reel and connected to the guide block;

[0009] wherein the fan is driven by the motor;

[0010] wherein, in a non-working state of the blowing type threading tool, the guide block is held at the blowing port; when the blowing type threading tool is started and the motor is rotating forward, the motor drives the fan to blow through the blowing port, so as to push the guide block to move in a direction away from the housing.

[0011] Optionally, the belt line spool is coupled to the motor via an overrunning clutch oriented such that, when the motor is rotating in a forward direction, rotational motion of the motor is not transmitted to the belt line spool, and when the motor is rotating in a reverse direction, rotational motion of the motor is transmitted to the belt line spool via the overrunning clutch.

[0012] Optionally, a torque limiting element, such as a friction clutch, is provided between the belt line spool and the motor, the torque limiting element being arranged such that, when the motor is rotating in a reverse direction, if the torque transmitted by the motor to the belt line spool reaches a torque limit, the torque limiting element goes into a slip condition, such that the torque transmitted by the motor to the belt line spool is maintained at or below the torque limit.

[0013] Optionally, the reverse rotational speed of the motor is less than the forward rotational speed of the motor.

[0014] Optionally, the belt line spool is kinematically decoupled from the motor, and the portion of the housing facing the belt line spool is provided with an opening, such that the belt line spool can be manually turned by an operator.

[0015] Optionally, the opening is provided with a cover that removably closes the opening.

[0016] Optionally, the belt line spool is provided with a turning feature facing the opening that can be manually manipulated by an operator to turn the belt line spool.

[0017] Optionally, the belt line spool is kinematically coupled to the motor, such that when the motor is rotating in a forward direction, the motor drives the belt line spool to rotate in a forward direction to pay out the belt line.

[0018] Optionally, the blow-type threading tool further comprises an additional motor for driving the belt line spool to rotate in a reverse direction to wind the belt line onto the belt line spool.

[0019] Optionally, the blow opening is sized smaller than the guide block, such that the guide block can be held at the blow opening without entering the housing.

[0020] Optionally, the blow opening is provided with a guide block retaining structure that releasably retains the guide block.

[0021] Optionally, the housing is provided with a guide block guide structure having a guide block retaining structure to block movement of the guide block toward the belt line spool.

[0022] Optionally, the guide block guide structure further defines a guide block guide passage that passes through the blow opening.

[0023] Optionally, the blow-type threading tool further comprises a guide nozzle comprising a base adapted to be fitted on the blow port and a nozzle portion extending from the base at an angle, the guide block being adapted to pass through the guide nozzle to change the moving direction.

[0024] Optionally, the nozzle portion is shaped to be adapted to be at least partially inserted into the end portion of the threading tube.

[0025] Optionally, the fan comprises a fan of the motor itself and / or a separate fan provided separately from the motor.

[0026] Optionally, a flow guide structure is provided in the housing to guide the airflow generated by the fan towards the direction of the blow port when the motor rotates in the forward direction.

[0027] In another aspect, the present application provides a blow-type threading tool comprising:

[0028] a housing having a blow port;

[0029] a compressed air tube extending from inside the housing to outside the housing, an outer end of the compressed air tube being adapted to be connected to an external compressed air source, an inner end being fixed inside the housing and pointing to the blow port;

[0030] a wire reel arranged in the housing; and

[0031] a wire and a guide block, a main body portion of the wire being wound on the wire reel, a terminal end being led out by the wire reel and connected to the guide block;

[0032] wherein, in a non-working state of the blow-type threading tool, the guide block is held at the blow port; in a state where the blow-type threading tool is activated, compressed air from the compressed air source is delivered through the compressed air tube towards the blow port to push the guide block to move in a direction away from the housing.

[0033] According to the present application, in the wire feeding operation of the wire, the blow-type threading tool utilizes the blowing effect on the guide block, the guide block guides the wire to pass through the threading tube, and the wire is more easily passed through the threading tube. Thus, the speed and success rate of the wire passing through the threading tube are improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] The foregoing and other aspects of the present application will become more fully understood and appreciated by reference to the detailed description below taken in conjunction with the accompanying drawings in which:

[0035] Figure 1 is a schematic view of a blow-type threading tool according to an exemplary embodiment of the present application;

[0036] Figure 2 isFigure 1 Fig. 1 is a schematic view of a blow operation of a blow-type threading tool according to some exemplary embodiments of the present application;

[0037] Figures 3-9 Fig. 2 is a schematic view of a blow-type threading tool according to some other exemplary embodiments of the present application. DETAILED DESCRIPTION

[0038] The present application generally relates to a hand-held blow-type threading tool, the basic principle of which is to realize a threading operation by blowing. Based on the basic principle of the present application, various specific forms of blow-type threading tools can be constructed.

[0039] One aspect of the present application relates to the realization of blowing of the threading tool by means of an electric motor. For example, according to a feasible embodiment shown in Fig. 1, the blow-type threading tool comprises a housing 1 which is configured to be suitable for being held by an operator when the threading tool is operated, and which meets the safety requirements and ergonomics requirements of a hand-held tool housing. Figure 1

[0040] In the housing 1, a reversible electric motor 2 is mounted, which has a motor shaft 3 and a motor fan 4 driven by the motor shaft 3. The motor fan 4 is oriented in such a way that, when the electric motor 2 rotates in the forward direction, the motor fan 4 sucks air outside the housing 1 into the housing 1 through a slit (not shown) in the part of the housing 1 facing the electric motor 2, especially the axial rear end (the end facing away from the motor shaft 3) of the electric motor 2; when the electric motor 2 rotates in the reverse direction, the motor fan 4 discharges the air inside the housing 1 to the outside of the housing 1 through the slit in the part of the housing 1 facing the electric motor 2.

[0041] Electric motors with fans are common in the field of electric tools, and therefore will not be described in detail.

[0042] In the housing 1, a thread reel shaft 5 is also mounted, on which a thread reel 6 is mounted, and the thread reel shaft 5 and the thread reel 6 can rotate together.

[0043] The thread reel shaft 5 is coaxially arranged with the motor shaft 3, a first end of the thread reel shaft 5 facing away from the motor shaft 3 is supported by a bearing 7, and a second end of the thread reel shaft 5 facing the motor shaft 3 is coupled with the motor shaft 3 through an overrunning (one-way) clutch 8. The overrunning clutch 8 is used to unidirectionally transmit the rotational motion from the motor shaft 3 to the thread reel shaft 5. The overrunning clutch 8 is oriented in such a way that, when the electric motor 2 rotates in the forward direction, the rotational motion of the motor shaft 3 is not transmitted to the thread reel shaft 5; when the electric motor 2 rotates in the reverse direction, the rotational motion of the motor shaft 3 is transmitted to the thread reel shaft 5 through the overrunning clutch 8, thereby driving the thread reel shaft 5 to rotate together.

[0044] ​The blowing-type threading tool further comprises a flexible string 10 (e.g. a soft cord) whose main body portion is wound on the string reel 6, and whose end is led out of the string reel 6 and connected to the guide block 11. The connection between the end of the string 10 and the guide block 11 can be a releasable connection, for example by means of a hooking structure, so that the guide block 11 can be detached from the end of the string 10. The guide block 11 is a block of light material, for example spherical, ellipsoidal, cylindrical, shuttle-shaped, etc., which can be hollow and whose outer dimensions are suitable for threading through the threading tube. Guide blocks 11 of various sizes can be provided in sets, so as to be suitable for threading tubes of different gauges.

[0045] The housing 1 has a blowing port 12 through which air drawn into the housing 1 by the motor fan 4 can be blown out when the motor 2 is rotating in the forward direction, and through which external air can be drawn into the housing 1 when the motor 2 is rotating in the reverse direction. Optionally, in the non-working state of the threading tool, the guide block 11 is held at the blowing port 12.

[0046] The blowing port 12 is formed in a gradually narrowing manner from the adjacent portion of the housing 1, and has a small size, so that a strong blowing is formed at the blowing port 12, thereby generating a strong blowing force acting on the guide block 11.

[0047] The blowing port 12 is preferably arranged substantially transversely to the string reel 6. Furthermore, the blowing port 12 can be sized smaller than the guide block 11, so that the guide block 11 is eventually stopped by the blowing port 12 when pulled by the string 10, and is not pulled into the housing 1.

[0048] Optionally, the blowing port 12 is provided with a guide block holding structure for releasably holding the guide block 11. Under the action of the wind force when the motor fan 4 blows out through the blowing port 12, the guide block 11 can be released from the holding structure.

[0049] When the motor 2 is rotating in the forward direction, the motor 2 does not rotate the string reel 6. At this time, the motor fan 4 rotates with the motor 2, thereby blowing out through the blowing port 12 and blowing the guide block 11 out, as shown in Fig. 2. The guide block 11 pulls the string 10 out of the string reel 6, and the string reel 6 is rotated in the forward direction by the string 10. Figure 2

[0050] When the motor 2 is rotating in the reverse direction, the motor 2 rotates the string reel 6 in the reverse direction through the overrunning clutch 8, the string reel 6 winds the string 10 thereon, the string 10 pulls the guide block 11 back, and the guide block 11 is eventually stopped at the blowing port 12.

[0051] ​In the threading operation with the threading tool, the operator aims the blowing port 12 at the first end of a threading pipe (not shown) so that the guide block 11 is inserted into the first end of the threading pipe. Then the operator starts the threading tool so that the motor 2 is rotated forward to blow air into the threading pipe through the blowing port 12. Under the action of the air flow, the guide block 11 moves in the threading pipe and pulls the string 10 out and through the threading pipe until the guide block 11 is blown out of the second end of the threading pipe. The operator stops the threading tool. In this way, the string 10 is fed into the threading pipe.

[0052] Next, the operator ties one end of the cable to the end of the string 10. Then the operator starts the threading tool so that the motor 2 is reversed. The motor 2 reverses the rotation of the string reel 6 to retract the string 10. As the string 10 is retracted, the cable is pulled into the threading pipe by the string 10 and finally comes out of the first end of the threading pipe. Then the operator stops the threading tool and separates the string 10 from the cable. In this way, the retraction of the string 10 is completed and the threading of the cable is completed.

[0053] It can be seen that in the feeding of the string 10, the light guide block 10 is quickly pushed by the air flow in the threading pipe, thus increasing the speed of the feeding. In addition, since the air flow easily follows the path of the threading pipe, the guide block 10 is always pushed by the air flow to move along the threading pipe. Even when encountering a corner, even a 90-degree corner, the guide block 10 can easily change direction and is not easily stuck in the threading pipe, thus increasing the success rate of the feeding.

[0054] On the other hand, in the retraction of the string 10, the motor 2 reverses the rotation of the string reel 6 to retract the string 10, so the string 10 can be quickly retracted. On the other hand, in the retraction of the string 10, the threading tool sucks air through the blowing port 12, which can also create a negative pressure in the threading pipe, thus helping the guide block 10 to return.

[0055] It should be noted that in the retraction of the string 10, the guide block 10 can also be removed from the string 10.

[0056] It should also be noted that considering the different effects of the forward and reverse rotation of the motor 2, the reverse speed of the motor 2 can be set to be lower than the forward speed, so that the retraction of the string 10 is not too violent.

[0057] It can be understood that the threading tool can have various structures as long as it can achieve the blowing feeding of the guide block 11 and the pulling back of the guide block 11. Some other possible structures of the threading tool are described below.

[0058] Figure 3 Another possible embodiment of a blowing type threading tool is shown, which is similar to the embodiment shown in Fig. 1, but the blowing port 12 is located on the side of the guide block 11. Figure 1The difference in the implementation method lies in the fact that the wire reel shaft 5 of the blower-type wire threading tool is equipped with a friction clutch 13. This friction clutch 13 is configured to be engaged when the torque in the wire reel shaft 5 is below a certain torque limit, and to slip or disengage when the torque in the wire reel shaft 5 reaches the torque limit. By adding this friction clutch 13, when the motor 2 reverses, if the torque in the wire reel shaft 5 is too high (for example, the guide block 11 is stuck somewhere in the threading tube, or the guide block 11 is blocked by the blower nozzle 12), the friction clutch 13 slips or disengages to maintain the torque in the wire reel shaft 5 at or below the torque limit, thereby protecting the motor 2, the wire 10, and the guide block 11.

[0059] It is understandable that other types of torque limiting elements can be used to replace the friction clutch 13. In addition, as a modification, such torque limiting elements can be provided in the motor shaft 3, or between the motor shaft 3 and the cable reel shaft 5 (for example, combined with the overrunning clutch 8), or between the cable reel shaft 5 and the cable reel 6.

[0060] Figure 3 Other aspects of the illustrated embodiments and Figure 1 The embodiments shown are the same or similar, and will not be described again here.

[0061] Figure 4 This illustrates another feasible implementation of a blower-type threading tool, compared to... Figure 1 The difference in the implementation method lies in the addition of a guide block guide structure 14 in the housing 1 at the position between the wire reel 6 and the air outlet 12. This guide block guide structure 14 has a narrowing portion 15 to form a guide block holding structure. This narrowing portion 15 prevents the guide block 11 from moving further toward the wire reel 6 and can releasably hold the guide block 11 (e.g., by friction). Furthermore, a guide block guide channel 16 is defined in the guide block guide structure 14, extending directly to the air outlet 12. The dimensions of the guide block guide channel 16 and the air outlet 12 are configured such that the guide block 11 (or guide blocks 11 of different sizes) can pass through them. When the threading tool is not in operation, the air outlet 12 is held at the narrowing portion 15 of the guide block guide structure 14. During the wire feeding operation of the wire 10, the direction and speed of the guide block 11 being blown out of the threading tool are more easily controlled due to the guiding effect of the guide block guide channel 16.

[0062] Figure 4 Other aspects of the illustrated embodiments and Figure 1 , Figure 3 The embodiments shown are the same or similar, and will not be described again here.

[0063] Figure 5A modification of the blow-type threading tool shown in Figure 4 A modification of the blow-type threading tool shown in

[0064] The guide nozzle 20 can have various shapes and configurations as long as it can change the blowing direction of the guide block 11 so as to enter the threading tube in a smoother direction.

[0065] For the embodiment shown in Figure 1 , Figure 3 A similar guide nozzle 20 can also be provided for the blow port 12 for the embodiment shown in

[0066] Figure 6 Another possible embodiment of the blow-type threading tool (the blow port and the guide block are omitted) is shown in

[0067] Figure 6 Other aspects of the embodiment shown in

[0068] Figure 7Fig. 6 shows another possible embodiment of the blow-type threading tool (the blow opening and the guide block are omitted), which differs from the various embodiments described above in that the wire spool shaft 5 of the wire spool 6 is kinematically decoupled from the motor shaft 3, i.e. the wire spool shaft 5 is not driven by the motor shaft 3. Furthermore, an opening is provided in the housing 1 at a position facing the outer side surface of the wire spool 6, and a cover 24 is detachably attached to close the opening. The cover 24 can be opened to expose the outer side surface of the wire spool 6. At the same time, the outer side surface of the wire spool 6 is provided with a rotation feature, such as the illustrated groove 25 or a handle (not shown), which can be manually manipulated by an operator to rotate the wire spool 6. In the retraction operation of the wire 10, the operator rotates the wire spool 6 by means of the rotation feature to retract the wire 10 and the guide block (not shown) carried thereby.

[0069] The cover 24 can have various shapes and configurations, as long as it can be opened to allow the operator to access the wire spool 6 when it is necessary to retract the wire 10.

[0070] Figure 7 Other aspects of the illustrated embodiment are the same as or similar to those of the above embodiments, and will not be described again.

[0071] Figure 8 Fig. 7 shows another possible embodiment of the blow-type threading tool (the blow opening and the guide block are omitted), in which the motor shaft 3 of the motor 2 is coupled to the wire spool shaft 5 of the wire spool 6 and the fan shaft 27 of the fan 23 by means of a bevel gear set 26. The wire spool shaft 5 and the fan shaft 27 can be coaxially arranged as shown in the figure; alternatively, they can be arranged at different positions and / or orientations. The wire spool shaft 5 is equipped with the overrunning clutch 8.

[0072] When the motor 2 is rotated in the forward direction, it drives the fan 23 to draw in external air through the gap in the portion of the housing 1 facing the fan 23, and to blow the air through the blow opening (not shown) and thereby to feed the wire 10 carried by the guide block (not shown) out of the tool. Due to the overrunning clutch 8, the motor 2 does not drive the wire spool 6 when it is rotated in the forward direction, and the wire spool 6 is only driven by the guide block carrying the wire 10 to rotate in the forward direction.

[0073] When the motor 2 is rotated in the reverse direction, it drives the fan 23 to draw in air through the blow opening (not shown) and to drive the wire spool 6 in the reverse direction through the overrunning clutch 8 to retract the wire 10 and the guide block.

[0074] Furthermore, a flow guide structure 28 is provided in the housing 1 around the fan 23 to facilitate the feeding of the air drawn in by the fan 23 through the gap in the portion of the housing 1 facing the fan 23 to the direction of the blow opening.

[0075] Furthermore, the housing 1 is equipped with a handle 30 for the operator to grip.

[0076] Figure 8 The guide structure 28 and the handle 30 shown in the above embodiment can also be applied to the various embodiments described above.

[0077] Figure 8 Other aspects of the embodiments shown are the same as or similar to the above embodiments, and will not be described again.

[0078] In the various embodiments described above, the motor does not drive the tape reel to rotate forward when the motor rotates forward. According to an embodiment not shown, the motor can be configured to drive the tape reel to rotate forward when the motor rotates forward, to facilitate the unwinding of the tape.

[0079] In this embodiment, to avoid the unwinding speed of the tape on the tape reel being greater than the forward moving speed of the guide block, a detection element (for example, arranged near the air outlet) for detecting the moving speed of the tape can be arranged in the housing, and the tape is provided with a mark or feature that can be detected by the detection element. The threading tool includes a controller that can receive the moving speed of the tape detected by the detection element, and control the forward rotating speed of the motor, so that the unwinding speed of the tape on the tape reel caused by the forward rotation of the motor is substantially equal to the moving speed of the tape detected by the detection element. In this embodiment, no overrunning clutch is arranged between the motor shaft and the tape reel shaft. The motor shaft and the tape reel shaft can be connected through a speed reduction mechanism. The motor fan and / or a separate fan arranged separately from the motor is used to achieve air blowing. If a separate fan is used, the transmission ratio of the transmission mechanism between the motor shaft and the fan should ensure high-speed rotation of the fan to maintain the required air blowing amount.

[0080] In the embodiment in which the motor drives the tape reel to rotate forward, the rotation of the tape reel can be driven by reverse rotation of the motor, or manually rotated, as described above.

[0081] Further, in the embodiment in which the motor drives the tape reel to rotate forward and reverse, a two-gear transmission mechanism or a stepless transmission mechanism can be arranged between the motor shaft and the tape reel shaft, so that the speed of the motor driving the tape reel to rotate forward and reverse is different.

[0082] Further, according to an embodiment not shown, the motor can be used to achieve air blowing and possibly driving the tape reel to rotate forward, and an additional motor is used to drive the tape reel to rotate reverse.

[0083] Another aspect of this application relates to using a compressed air source to blow air onto a threading tool. The compressed air source can be an air compressor, a compressed air tank, a compressed air supply line, etc., and the threading tool of this application can be connected to the compressed air source to perform the threading operation. Similar to the various exemplary embodiments using a motor to blow air described above, the threading tool using a compressed air source to blow air can also have various configurations.

[0084] For example, in Figure 9 In one feasible embodiment shown, the blower-type threading tool includes a housing 1 with a blower nozzle 12, a thread reel shaft 5 mounted on the housing 1, and a thread reel 6 mounted on the thread reel shaft 5. Furthermore, the blower-type threading tool also includes a guide block 11 and a thread 10 connecting the thread reel 6 and the guide block 11. Additionally, an opening and a cover 24 removably closing the opening are provided on the outer surface of the housing 1 facing the thread reel 6. Simultaneously, the outer surface of the thread reel 6 is provided with rotational features that allow the operator to manually rotate the thread reel 6, such as the groove 25 shown in the figure or a handle (not shown).

[0085] In addition, the blower-type threading tool also includes a compressed air hose 40, which is a flexible tube extending from the inside of the housing 1 to the outside. The outer end of the compressed air hose 40 has an interface 41 suitable for connection to a compressed air source. The inner end of the compressed air hose 40 has a nozzle 42, which is fixed inside the housing 1 and points towards the air outlet 12. The nozzle 42 itself has a mechanical or electric switching valve (not shown), which the operator can operate via an operating button (not shown) on the housing to open or close the valve. When the switching valve is open, compressed air introduced from the compressed air source through the compressed air hose 40 is sprayed from the nozzle 42 towards the air outlet 12, thereby blowing the guide block 11 forward and pulling the thread 10 through the threading tube. During the thread 10 retraction operation, the operator opens the cover 24 and rotates the thread reel 6 using its rotation feature to retract the thread 10 and its accompanying guide block 11.

[0086] The threading tool that uses compressed air to generate air can also be equipped with the aforementioned reference. Figure 4 The described guide block guide channel and / or reference Figure 5 The guide nozzle described.

[0087] Those skilled in the art can make various modifications to the handheld blower-type threading tool of this application based on the basic principles of this application, so as to suit various purposes.

[0088] According to the present application, in the feeding operation of the tape, the blowing type threading tool utilizes blowing to act on the guide block, and the guide block guides the tape to pass through the threading pipe. Due to the guiding effect of the guide block in the threading pipe, the tape is more easily to pass through the threading pipe, even in the case of the existence of the corner of the threading pipe. Thus, the speed and success rate of the tape passing through the threading pipe are improved.

[0089] In the embodiment of reversing the tape reel by the motor, in the retraction operation of the tape, the rotation of the motor drives the tape to retract, and the speed of the tape retraction is improved.

[0090] Although the present application is described herein with reference to specific exemplary embodiments, the scope of the present application is not limited to the details of the illustrated embodiments. Various modifications can be made to these details without departing from the spirit of the present application.

Claims

1. A blow-through threading tool comprising: a housing (1) having a blow-through opening (12); a motor (2), a fan (4, 23) and a tape reel (6) arranged in the housing; and a tape (10) and a guide block (11), a main portion of the tape being wound on the tape reel, a terminal end being led out of the tape reel and connected to the guide block; wherein the fan (4, 23) is driven by the motor; wherein, when the blow-through threading tool is activated and the motor is rotating in a forward direction, the motor drives the fan to blow through the blow-through opening to push the guide block to move in a direction away from the housing; wherein the housing is provided with a guide block guide structure (14) at a position between the tape reel and the blow-through opening, the guide block guide structure being formed with a constriction (15) to constitute a guide block holding structure for holding the guide block at the constriction in a non-working state of the threading tool, the constriction preventing the guide block from moving further towards the tape reel and releasably holding the guide block; the guide block guide structure further defining a guide block guide passage (16) through the blow-through opening to control the direction and speed of the guide block blown out of the threading tool in a tape feeding operation of the tape.

2. The blow-molded threading tool of claim 1, wherein, the tape reel and the motor are coupled by a freewheel (8) oriented such that, when the motor is rotating in a forward direction, the rotational movement of the motor is not transmitted to the tape reel; when the motor is rotating in a reverse direction, the rotational movement of the motor is transmitted to the tape reel through the freewheel.

3. The blow-molded threading tool of claim 2, wherein, a torque limiting element is provided between the tape reel and the motor, the torque limiting element being arranged such that, when the motor is rotating in a reverse direction, if the torque transmitted by the motor to the tape reel reaches a torque limit value, the torque limiting element is in a slipping state such that the torque transmitted by the motor to the tape reel is maintained at or below the torque limit value.

4. The blow-molded threading tool of claim 3, wherein, the torque limiting element is a friction clutch.

5. The blow-molded threading tool of claim 2, wherein, the reverse rotation speed of the motor is less than the forward rotation speed.

6. The blow-molded threading tool of claim 1, wherein, the tape reel and the motor are kinematically decoupled, a portion of the housing facing the tape reel is provided with an opening such that the tape reel can be manually rotated by an operator.

7. The blow-molded threading tool of claim 6, wherein, the opening is equipped with a cover to releasably close the opening.

8. The blow-molded threading tool of claim 6, wherein, the tape reel is provided with a rotation feature facing the opening to manually rotate the tape reel by an operator.

9. The blow-molded threading tool of claim 1, wherein, the tape reel and the motor are kinematically coupled such that, when the motor is rotating in a forward direction, the motor drives the tape reel to rotate in a forward direction to pay out the tape.

10. The blow-through threading tool of claim 1, further comprising an additional motor to drive the tape reel to rotate in a reverse direction to wind the tape onto the tape reel.

11. The blow-through threading tool of any one of claims 1 to 10, further comprising a guide nozzle (20) comprising a base portion (21) adapted to be fitted over the blow-through opening and a nozzle portion (22) extending at an angle from the base portion, the guide block being adapted to travel in the guide nozzle to change the direction of movement.

12. The blow-molded threading tool of claim 11, wherein, the nozzle portion is shaped to be adapted to be at least partially inserted into an end portion of a threading tube.

13. The blow-molded threading tool of any one of claims 1 to 10, wherein, The fan comprises a fan which is part of the motor itself and / or a separate fan which is arranged separately from the motor.

14. The blow-molded threading tool of any one of claims 1 to 10, wherein, The housing is provided with a flow guide structure (28) for guiding the air flow generated by the fan in the direction of the blow opening when the motor is rotating in the forward direction.

15. A blow-type threading tool comprising: a housing (1) having a blow opening (12); a compressed air tube (40) extending from inside the housing to outside the housing, the outer end of the compressed air tube being adapted to be connected to an external compressed air source, the inner end being fixed inside the housing and pointing towards the blow opening; a tape reel (6) arranged in the housing; and a tape (10) and a guide block (11), the main body portion of the tape being wound on the tape reel, the end being led out of the tape reel and connected to the guide block; wherein, in the state in which the blow-type threading tool is activated, compressed air from the compressed air source is conveyed through the compressed air tube towards the blow opening to push the guide block to move in the direction away from the housing; wherein the housing is provided with a guide block guide structure (14) at a position between the tape reel and the blow opening, the guide block guide structure being formed with a narrowed portion (15) to constitute a guide block holding structure for holding the guide block at the narrowed portion in the non-working state of the threading tool, the narrowed portion preventing the guide block from moving further towards the tape reel and releasably holding the guide block; the guide block guide structure further defining a guide block guide passage (16) through the blow opening to control the direction and speed of the guide block blown out of the threading tool in the threading operation of the tape.

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