JPH0639365U - Screw tightener - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a screw tightening machine used for tightening connecting screws, in which screws are planted in a row at regular intervals in a resin band, and its purpose is to reduce the length. The purpose of the present invention is to construct a screw tightener that requires less time to adjust the tightening depth of the screw when using the adjuster to tighten different screws. [Structure] A scale 34 according to the length of the screw to be tightened is attached to the coupling 26, and when tightening screws of different lengths, the number of times of trial tightening for achieving the same tightening depth is reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a screw tightening machine used for tightening connecting screws in which screws are planted in a row in a resin band at regular intervals.

[0002]

[Prior art]

 The screw tightener used as described above is generally configured by connecting a motor part 31 and a screw tightening attachment 30 with a coupling 32 as shown in FIG. 4, and in order to tighten screws of different lengths, Depending on the length of the screw, several types of adjusters must be attached to the tip of the sliding member, and the locking member is operated accordingly to adjust the tightening depth of the screw. Conventionally, there is no reference for the operation of the locking member, and the tightening depth of the screw is adjusted by repeating the trial tightening.

[0003]

[Problems to be solved by the device]

 In the conventional screw tightening machine, adjustment of the screw tightening depth when using the adjuster to tighten screws with different lengths was performed by repeating trial tightening as described above. However, there was a drawback that adjustment took time and work efficiency deteriorated. An object of the present invention is to construct a screw tightener that requires less time to adjust the screw tightening depth when using an adjuster.

[0004]

[Means for Solving the Problems]

 Since the adjuster to be used is determined by the length of the screw to be tightened, the above object can be achieved by attaching a scale according to the length of the screw to be tightened to the coupling.

[0005]

[Action]

 The scale attached to the coupling as described above serves as a guide for operating the locking member when adjusting the screw tightening depth when the adjuster is used to tighten screws having different lengths.

[0006]

【Example】

 An embodiment of the screw tightener of the present invention is shown in FIGS. In the figure, the electric motor unit 1 includes an electric motor 2, a variable speed gear 3 for transmitting rotational power of the electric motor 2, a speed change gear 5 having a claw 4 inclined at an end thereof, and a claw 4 of the speed change gear 5. The mating claw portion 6 is provided at the rear end, and the inner periphery of the tip has a square hole 9 of a specific depth for transmitting rotational power to the angular shaft 8 of the bit 7, and the angular shaft 8 of the bit 7 is specified. A ball 12 is embedded by penetrating a small hole 11 at a position where it engages with a groove 10 provided at a position, and a socket 14 having a grip 13 of a bit 7 is mounted on the outer peripheral portion thereof. The socket 14 is rotatably supported by the variable speed gear 5 and the metal 15, and is urged by the elastic body 16 to transmit the rotational power of the speed change gear 5 to the bit 7. The gripping portion 13 of the bit 7 is composed of a piece 17, a spring 18 and a retaining ring 19. The piece 17 is slidably attached to the outer circumference of the socket 14 and has a large diameter portion 20 on the front end side of the inner circumference. The side is locked by a retaining ring 19 fitted in the socket 14, and the rear end is biased by a spring 18.

Reference numeral 21 is a screw tightening attachment disclosed in US Pat. No. 4,590,034 (details not shown), and reference numeral 22 is a sliding member that holds a connecting screw 23 and has a screw feed mechanism built therein, which is slidable in a casing 24. In addition, the housing 25 is biased by a spring 25 so as to always project from the tip of the casing 24. The casing 24 is attached to the electric motor unit 1 via a coupling 26, and the coupling 26 is screwed on the outer periphery thereof with a locking member 27 that engages with the projection 22a of the sliding member 22 and limits the tightening depth of the screw. However, an opening 28 for operating the grip portion 13 of the bit 7 is provided.

To tighten the screw, the electric motor 2 is rotated, and the rotational power is transmitted to the bit 7 via the socket 14 by the frictional force of the speed change gears 3, 5, and the elastic body 16. Next, when the tip of the sliding member 22 is applied to the tightened member and the electric motor unit 1 is pressed, the sliding member 22 retracts into the casing 24 against the biasing force of the spring 25, and the screw of the connecting screw 23 is pushed. Are sent on the bit 7 axis. When the electric motor part 1 is further pressed, the cross hole of the screw head and the rotating bit 7 are fitted, and the screw penetrates the connecting band 23a connecting the screw, and the claw at the end of the socket 14 is pressed by the reaction force. The portion 6 and the claw portion 4 of the speed change gear 5 are fitted to each other to transmit the rotational power of the electric motor 2, tighten the screw, and the protrusion 22a at the rear end of the sliding member 22 and the locking member 27 come into contact with each other to tighten the screw. The attachment depth is limited, and the claw portion 6 of the socket 14 is disengaged by the component force of the inclination of the claw portion 4 at the rear end of the speed change gear 5, and the tightening of the screw is completed. When the screw tightener main body is separated from the member to be tightened after the tightening is completed, the sliding member 22 is urged by the spring 25 to return to the original position.

When tightening screws having different lengths, an adjuster 33 corresponding to the length of the screw is attached to the front end of the sliding member 22 as shown in FIG. At this time, by mounting the adjuster 33, the relative distance between the end face of the sliding member 22 including the adjuster 33 and the bit 7 is changed, so that the tightening depth of the screw is also changed. Therefore, in order to obtain the same tightening depth even if the length of the screw is changed, first, as shown in FIG. 1, the locking member 27 is set using the scale 34 attached to the coupling 26 according to the length of the screw as a guide. Is operated to change the retractable length of the sliding member 22 into the casing 24 by the thickness of the adjuster 33, and then the locking member 27 is operated by trial tightening to adjust the length.

[0010]

[Effect of device]

 According to the present invention, the coupling that connects the electric motor section and the screw tightening attachment is graduated according to the length of the screw to be tightened, so even if an adjuster is used to tighten screws of different lengths. By operating the locking member using the scale as a guide, the tightening depth of the screw can be roughly adjusted once, and the number of trial tightening can be reduced. Therefore, it is possible to configure a screw tightener that requires less time to adjust the screw tightening depth when using the adjuster.

[Brief description of drawings]

FIG. 1 is a partial front view of a screw tightener showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional front view of a screw tightening machine showing an embodiment of the present invention.

FIG. 3 is a partial view showing a state in which an adjuster is attached to FIG.

FIG. 4 is an external view of a screw tightener according to the related art.

[Explanation of symbols]

1 is an electric motor part, 2 is an electric motor, 3 and 5 are speed change gears, 7 is a bit, 21 is a screw fastening attachment, 22 is a sliding member, 22a is a protrusion, 23 is a connecting screw, 23a is a connecting band,
24 is a casing, 25 is a spring, 26 is a coupling,
27 is a locking member, 29 is a handle, 33 is an adjuster,
34 is a scale.

Claims (1)

[Scope of utility model registration request] 1. A bit which is provided with a speed change gear between an electric motor arranged at a front end and a handle formed at a rear end, and which is rotationally driven by the electric motor via the speed change gear to perform a screw tightening operation. The electric motor part equipped with, a screw feed mechanism that sequentially feeds each screw of the connecting screws planted in a row at a constant interval in a resin band in a row to a predetermined tightening position, and is located in front of the bit, A casing that supports the sliding member holding the connecting screw by a spring so as to always project from the front end of the electric motor portion by a predetermined length, and retracts to the upper portion of the electric motor when tightening the screw, and the sliding member. The screw tightening attachment is equipped with a sending mechanism that sequentially sends each screw of the connecting screw to a predetermined position of the sliding member for each reciprocating operation, and tightens screws of different lengths. When adjusting, the adjuster according to the length of the screw to be tightened is used by attaching it to the tip of the sliding member, and the coupling is engaged with the casing to adjust the tightening depth of the screw. A screw tightener provided with a locking member, wherein the coupling is provided with a scale corresponding to the length of the screw to be tightened.