JPS6023084Y2 - electric nutter - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a nutter in which members to be joined, such as panels, are integrally joined with a nut, and the joining of the members and the fixing of the nut are performed at the same time. The purpose is to easily integrate the rotation of the screw mandrel and the main shaft side, and to use a single spring to push the locking ring forward and the clutch member backward. In addition to simplifying the structure of the constituent parts, this is intended to improve the durability and operability of not only the clutch member but also the body of the Natsuta.Hereinafter, an embodiment shown in the figure will be described. .

In the figure, 1 is a Natsuta 1 whose drive source is an electric motor.
Reference numeral 2 denotes a spindle housing which is properly fixed to a housing 3 which internally teeth the drive source, and a spindle 5 is rotatably supported on the boss portion 2a of the housing through a bearing 4, and a front end flange portion 5a of the spindle housing has a thrust bearing. 6' is supported by the boss portion 2a, and the rear end shaft portion 5b is provided to protrude into the spindle housing 2, and a drive gear 6 is appropriately fixed to the shaft portion.

Reference numeral 7 denotes a rolling sleeve, the front end flange part 7a of which is located in front of the flange part 5a of the spindle, and the rear end cylindrical part 7b closely connected to a hollow part 5C with a circular cross section provided at the center of rotation of the spindle 5. is mated to.

8 is the cylindrical portion 7 from the front end of the inner peripheral surface of the rolling sleeve 7.
This is an engagement groove in the thrust direction that is carved up to the vicinity of the center of b, and as shown in FIGS. At the same time, there is a large circular arc surface 8 on the reverse rotation direction (arrow B direction) side.
It is formed continuously as b.

Reference numeral 9 designates a rolling nut, the rear end flange portion 9a of which is located in front of the flange portion 7a of the rolling sleeve, and the rear end screw portion 10a of the main shaft is screwed into a screw hole 9b provided at the center of rotation. A threaded groove is formed in this threaded portion so as to move the shaft rearward when the shaft 10 does not rotate when the nut 9 rotates in the forward direction.

Further, the front end of the flange portion 9a is supported via a slat bearing 13 on the inner surface of a connecting hollow bolt 12 which is integrally fixed to the boss portion 2a of the spindle nose/using via a connector 11. Furthermore, the flange portion 9a of the rolling nut and each flange portion 5a of the spindle and rolling sleeve described above, ? A has a plurality of corresponding fitting holes 14 in the thrust direction, and fixing pins 15 are inserted and hooked into these fitting holes, so that the spindle 5, the rolling sleeve 7, and the rolling nut are eventually fixed. The three 9 are integrally connected.

16 is a rolling piece fitted into the inner surface of the cylindrical portion 7b of the rolling sleeve, and the front end of the piece is fixed to the rear end shaft 10b of the main shaft 10 via a fixing pin 17, and is provided on the rear side thereof. An engagement/disengagement ball 19 which is urged to protrude outward by a ball spring 18 is fitted into the diametrical hole 16a, and this ball is used to maintain the rolling sleeve in the normal state (state before operation). It is engaged with the matching groove 8.

However, the ball 19 has a small circular arc surface 8a in the engagement groove 8.
Therefore, for example, when an external force is applied to the piece 16 to prevent its rotation, the forward rotation of the rolling sleeve 7 causes the large arcuate surface 8b to touch the ball. 19 can be easily pushed into the hole 16a of the piece. However, since the reverse rotation of the sleeve makes the above-described pushing action of the ball 19 difficult, the reverse rotation force of the sleeve pushes the ball 19. This constitutes a clutch mechanism that acts as a large force to reversely rotate the piece 16.

Reference numeral 20 denotes a cylindrical clutch member fitted to the front outer periphery of the main shaft 10, and this member is formed with several elongated holes 20a in the thrust direction that engage with a locking pin 21 protruding from the main shaft 10. Although it is possible to move in the thrust direction within that range, it is restricted to rotate integrally with the main shaft 10, and dog teeth 20b are arranged at equal intervals in the circumferential direction on the rear end surface of the member. Furthermore, the spring pressure of a nose spring 22 wound around the outer periphery of the main shaft 10 is always applied to the front end surface of the member, as will be described later.

The front end face of the connecting hollow bolt 12 is located behind the dog teeth 20b of the clutch member, and a fixed member is provided on the front end face so as to be able to engage and disengage from the dog teeth 20b of the clutch member. Side dog teeth 12a are disposed, and a clutch member 20 is attached to these dog teeth.
Tapered surfaces 23 are formed to ensure smooth engagement between the two during forward rotation of the sides, and step portions 24 parallel to the thrust direction are formed to ensure engagement between the two. There is.

Note that the dog teeth 20b and 12a are not engaged in normal conditions, but when they are engaged during work, the main shaft 10 is reliably prevented from rotating via the clutch member 20 and pin 21. It is designed to be

25 are notches in the thrust direction arranged at equal intervals in the circumferential direction of the front end flange portion 10c of the main shaft;
Reference numeral 26 denotes a rotation prevention ring fitted around the outer periphery of the main shaft between the flange portion 10c and the nose spring 22, and the spring pressure of the nose spring 22 is constantly applied to the rear end surface of this ring. The spring pressure of the spring acts on the rear end surface of the ring 26 and the front end surface of the clutch member 20 so as to constantly push the former forward and the latter backward.

At least one protrusion 26a that engages with the notch 25 of the main shaft is formed on the front end surface of the ring 26, and the ring 26 is pushed forward by the spring pressure of the spring 22. And the protrusion 26a
When the protrusion is engaged with the notch 25, the tip of the protrusion is connected to the front end flange 10c of the main shaft.
The length is such that it protrudes further forward than the front surface of.

27 is a screw mandrel, and the rear end side screw portion 27
a is the screw hole 1 provided in the center of the front end of the main shaft
0d, and the proximal end flange portion 27b of the threaded portion is provided with a notch 2 of the main shaft.
At least one notch 28 is formed in the thrust direction that is approximately equal to 5. Therefore, when screwing the screw portion 27a into the screw hole 10d of the main shaft, each of the notches 25 and 28 provided in both flange portions is formed. When the positions are matched and the protrusions 26a of the ring are engaged with these notches in this state, the mandrel 27 rotates integrally with the main shaft 10 via the rings.

Reference numeral 27 denotes a threaded portion on the front end side of the mandrel, which has a threaded groove for transferring the nut 29 to the nose piece 36 side when the nut 29 screwed thereto does not rotate during normal rotation of the mandrel. The cage 27a is a rotating shaft support of the mandrel.

Reference numeral 30 designates a nose for pivotally supporting the mandrel 27, and the rear end cylindrical portion 30a is fitted around both the main shaft and mandrel flange portions 10c, 27b, and the outer circumference of the nose spring 22, and its outer peripheral surface is , is fitted with the inner circumferential surface of the front end opening 32a of the connector 32 fixed to the front part of the bolt 12 via the lock nut 31, and an elongated hole 30b in the thrust direction is formed in the cylindrical part. A locking bolt 33 is engaged in the long inner portion from the outside of the connector 32.

34 is a nose 30 that comes into contact with the front end surface of the connector 32;
A spacer provided on the rear part, 35 is a connector 32
and a cylindrical safety cover provided on the outer peripheral surface of the nose 30, and 36 is a nose piece.

A limit bottle 37 is inserted into a through hole 38 in the thrust direction provided at the center of the rear end shaft portion 5b of the spindle, and its head 37a is pushed toward the rear end surface of the piece 16 by the spring pressure of the spring 39. It is energized so that it is always in contact.

Reference numeral 40 denotes a limit switch for reversing the drive gear 6, which is fixed to the housing 3 of the drive source, and the switch lever 4
The tip acting portion 0a extends behind the through hole 38 of the spindle, and when the limit pin moves rearward, the rear end surface pushes the lever 40a, thereby activating the limit switch. , the rotation direction of the drive gear 6 is rotated in the opposite direction for a certain period of time.

41 is a power transmission mechanism, 42 and 43 are members to be coupled and integrated by nuts 29, and 44 is a mounting hole for each nut 29 formed therein.

Although not shown, at appropriate locations on the Natsuta 1, as a switch mechanism for activating the drive source, there is an activation switch for rotating the drive gear 6 in the forward rotation direction (arrow A), a stop switch, and a switch mechanism for activating the drive source. It is assumed that an emergency switch or the like is suitably provided for rotating the gear 6 in the reverse direction in an emergency.

The coupling effect of the nuts 29 on the members 42 and 43 to be coupled will be explained below.

First, in a normal state, when the actuation switch is activated and the waist drive gear 6 is rotated in the forward direction, the spindle 5, the mouth/ring sleeve 7, and the rolling nut 9, which are fixed to the gear, are rotated together. Since the pieces are similarly rotated together via the engaging/disengaging ball 19 interposed between them, the main shaft 10 and the screw mandrel 27, which are in a fixed relationship with the pieces, are also rotated in the forward direction, and in this normal state, Since the dog teeth 20b of the clutch member 20 fitted to the main shaft 10 via the pin 21 do not mesh with the dog teeth 12a on the fixed side, the main shaft 10 and the clutch member 20 are similarly rotated together.

Further, since it is customary to insert the head 29a of the nut 29 into the mounting hole 44 of the nut 29 drilled in each of the members 42 and 43 to be coupled in advance, When the nut 1 is pressed toward the member to be joined 43 so that the front end threaded portion 27c of the screw mandrel 27, which is rotating in the forward direction, is screwed into the nut, the nut 2
9 does not rotate, but the nut 1 side moves forward, and as shown in FIG. 4, the head 29a of the nut and the front end surface of the nose piece 36 come into contact and are tightened.

Therefore, since the rotation of the mandrel 27 is stopped by this tightening action, the rotation of the main shaft 10 and the rolling piece 16 are stopped at the same time.

However, as described above, since the rolling sleeve 7 pushes the ball 19 engaged with it into the hole 16a of the piece by the large circular arc surface 8b of its engagement groove, the sleeve, together with the rolling nut 9 and the spindle 5, The forward rotation will continue.

Therefore, the normal rotation of the nut 9 is transferred to the rear of the main shaft 10, but the nut 1 is transferred to the connected member 4.
Since it is supported in a pressing manner toward the 3 side, the nut 1 side eventually moves forward toward the member 43 side.

During this movement, since the nose 30 has the elongated hole 30b in the thrust direction, the forward movement of the nutter 1 is not inhibited, and the clutch member 20 receives the spring pressure of the nose spring 22 and moves backward. The member is moved, and the dog teeth 20b of the member are pressed into contact with the stationary side dog teeth 12a so that they are engaged or not engaged, as will be described later.

Further, when the forward movement of the nutter 1 described above is completed, that is, when the front end surface of the connector 32 comes into pressure contact with the spacer 34 provided on the rear surface of the nose, the connector 32 is moved toward the nose 3.
0. Because the nose piece 36 and the nut head 29a do not move forward any further, the screw mandrel 2
7 is forcibly transferred rearward (pulling action), and as a result, as shown in FIG.
9b is bulged and deformed on the back side of the member to be joined 42,
Both members 42 and 43 are combined and integrated.

Also, at approximately the same time that this coupling and integration is performed, the rolling piece 16 moves the rear limit pin 37 to the spring 3.
As shown in the diagram, the rear end surface of the pin pushes the rear switch lever 40a and operates the limit switch 40, thereby causing the drive gear 6 to It rotates in the opposite direction.

The drive gear 6 is reversely rotated almost simultaneously with the above-mentioned integration of the two members 42 and 43, and the dog tooth 20b of the clutch member pushed rearward by the nose spring 22 when the Natsuta 1 moves forward. When the main shaft 10 and the fixed side dog teeth 12a at the rear thereof are engaged with each other, the main shaft 10 is reliably prevented from rotating through the pin 21, so that the nutter 1 is moved backward and returned to its normal state.

Also, unlike this, both the dog teeth 20b, 12a
are simply pressed together at their end faces and do not mesh,
For example, when the tightening state of the screw mandrel 27 is released and the main shaft 10 and the rolling nut 9 are in a state where they can rotate together, when the drive gear 6 rotates in the opposite direction, the clutch member is reversely rotated and the spring of the spring 22 is rotated in the opposite direction. Since the dog teeth 20b and the stationary side dog teeth 12a are pushed backward by pressure, the shaft 10 is eventually prevented from rotating reliably, and the nutter 1 is also moved backward and is in the normal state. to return to.

In addition, when the screw mandrel 27 is maintained in a tightened state, the nutter 1 starts to rotate in the opposite direction on the main shaft 10 side, as will be described later, regardless of whether the dog teeth 20b and 12a are engaged or not. It will be moved backwards until it returns to normal.

However, as mentioned above, the backward movement of Natsuta-1 is
While the shaft 10 is prevented from rotating by the engagement of both dog teeth 20b and 12a or the tightened state of the screw mandrel 27, the shaft 10 is moved backward, but at the time of this movement, the shaft is prevented from rotating by the front end of the long hole 20a of the clutch member. When the pin 21 is engaged, the clutch member stops at that position despite the rearward spring pressure applied to the clutch member, so that the dog teeth 20b and 12a are disengaged. The main shaft 10 is placed in a state where it can rotate with the rolling nut 9, and the ball 19 on the rolling piece 16 side is engaged with the engagement groove 8 of the rolling sleeve, which rotates in the opposite direction substantially simultaneously with the disengagement of both dog teeth. As mentioned above, the reverse rotational force of the rolling sleeve 7 is applied to the piece 16 and the shaft 1 via the ball 19.
0 and the mandrel 27 are forcibly rotated in the reverse direction, the backward movement of the nutter 1 is completed.

In addition, when the screw mandrel 27 is maintained in a tightened state, the engagement groove 8 of the rolling sleeve described above
until the ball 19 on the rolling piece side is engaged and the rolling shaft 10 side is rotated in the opposite direction.
A backward movement is performed and the normal state is restored.

By continuing to rotate the screw mandrel 27 in the opposite direction after the nut 1 is returned to its normal state, the mandrel is automatically removed from the fixed nut 29.

In summary, the present invention includes a main shaft, a screw mandrel to which a coupling nut attached to the front part of the main shaft is screwed, a rolling nut to which the main shaft is transferred in the front-rear direction, and a spindle connected to the rolling nut. In this electric nutter, a cylindrical nut is provided on the outer periphery of the main shaft, which is located in front of the fixed dog teeth. In addition to fitting the clutch member, a detent ring for integrally rotating the main shaft and the screw mandrel is fitted to the outer periphery of the main shaft, which is the front position of the clutch member, and further, Both front and rear ends of a nose spring are directly connected and fitted between the front surface of the clutch member and the rear surface of the detent ring, respectively, and the clutch member is formed to be elongated in the thrust direction, and , a detent pin protruding from the main shaft side is engaged in the elongated interior, and dog teeth that are removable from the fixed side dog teeth are formed on the rear end surface of the clutch member; Further, since the front end surface of the rotation stopper ring is formed with a protrusion in the thrust direction that can be engaged with and detached from the notch in the thrust direction provided in the main shaft and the screw mandrel, the present invention is not limited to this invention. When using Natsuta, the above-mentioned rotational integration of the screw mandrel is easily and easily achieved by a simple method such as aligning the cut ends of the screw mandrel and the main shaft and engaging them with the front end protrusions of the detent ring. In addition to being reliable, a single spring can serve both the forward pushing action of the detent ring and the backward pushing action of the clutch member, reducing the number of parts and simplifying the structure of its components. be.

Further, since the clutch member of the present invention is formed in a cylindrical shape and is used by being fitted onto the outer periphery of the main shaft, it is easy to slide in the thrust direction, and furthermore, in this state, the clutch member can be easily slid in the thrust direction. Since it is disposed so as to be constantly pushed toward the rear fixed dog tooth side by a spring, it is difficult to avoid the bark of conventional clutch members of this type in which the rotating dog teeth are integrally formed with the main shaft (for example,
(Japanese Patent Publication No. 53-4674), the engagement and disengagement operations between both the fixed and rotating dog teeth can be performed smoothly and reliably. Since damage caused by defective or incomplete operation can be prevented, excellent practical effects can be achieved, such as improving the durability and operability of not only the clutch member but also the machine body.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the present invention, in which FIG. 1 is a partially cutaway vertical cross-sectional view of a nut during the work of joining members to be joined with a nut, and FIG. 3 is an enlarged sectional view of the central part of FIG. 2, and FIGS.
The figure is a partially cutaway sectional view showing the operating state of the nutter, Figure 6 is a perspective view showing the connecting hollow bolt and the clutch member, and Figure 7 is a perspective view showing the front end of the main shaft and the screw mandrel. be. 5... Spindle, 6... Drive gear,
7...Rolling sleeve, 9...Rolling nut, 10...Main shaft, 1
2a...Fixed side dog teeth, 16...Rolling piece, 20...Tubular clutch member,
20a...Elongated hole, 20b...Dog tooth, 21...Detent pin, 22...
Nose spring, 25.28...Notch, 2
6... Stop ring, 26a... Protrusion, 27... Screw mandrel, 29...
....Connecting nut, 30...Nose, 30
b...Olong hole, 32...Connector, 42
．． 43... Member to be joined.

Claims (1)

[Scope of utility model registration request] A main shaft, a screw mandrel to which a coupling nut attached to the front part of the main shaft is screwed, a rolling nut to transport the main shaft in the front-rear direction, and a drive gear fixed to the rolling nut via a spindle. , an electric nutter having fixed side dog teeth disposed at an outer circumferential position of the main shaft, a cylindrical clutch member being fitted on the outer circumference of the main shaft at a front position of the fixed side dog teeth; , a detent ring for integrally rotating the main shaft and the screw mandrel is fitted on the outer periphery of the main shaft, which is the front position of the clutch member; The front and rear ends of the nose spring are directly connected and fitted between the rear surface of the rotation stopper ring and the rear surface of the detent ring, and the clutch member is formed with an elongated part in the thrust direction, and within the elongated part, the above-mentioned A detent pin protruding from the main shaft side is engaged, and furthermore, a dog tooth is formed on the rear end surface of the clutch member and is removable from the fixed side dog tooth, and the detent ring is engaged with a detent pin protruding from the main shaft side. An electric natator characterized in that a front end face is formed with thrust-direction protrusions that can be engaged with and detached from thrust-direction notches provided in the main shaft and the screw mandrel.