JP5376898B2 - Feeder - Google Patents

Description

  The present invention relates to a feeding device using an ultrasonic transducer.

  Conventionally, there is a feeding device using an ultrasonic transducer (see Patent Document 1). The existing feeding device will be described with reference to FIG. The feeding device 1 includes an output unit 3, a slide guide mechanism 5, and a preload applying mechanism 7. The output unit 3 has a pair of ultrasonic transducers 9 arranged so as to cross each other. The pair of ultrasonic transducers 9 are connected by one output end 11. The slide guide mechanism 5 supports the output unit 3 so as to be slidable with respect to the base 13, and is usually configured by a roller guide that allows only linear movement in a specific direction. The preload applying mechanism 7 is constituted by a coil spring or the like, and urges the output portion 3 toward the driven portion 15 so that the output end portion 11 contacts the driven portion 15 with an appropriate pressing force. Yes.

However, in such a feeding device, as a result of investigation by the present inventor, it has been confirmed that a noise is generated while the driven part is driven.
JP 2000-152671 A

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a feeding device that can prevent the generation of abnormal noise during driving.

  In order to solve the above-described problems, a feeding device according to the present invention includes an output unit having an ultrasonic transducer, and a guide that slidably supports the output unit so that the output unit abuts and separates from a driven unit. A mechanism and a preload applying mechanism that applies a preload toward the driven portion to the output unit, the preload applying mechanism includes a coil spring and a sheet member, and the sheet member is Curved around the winding axis of the coil spring, covering the coil spring from the outside, and bridging between the winding materials constituting the coil spring, and joining between the sheet member and the winding material The material is interposed.

  Preferably, the sheet member is a polyimide tape, and the bonding material is an adhesive layer provided on the surface of the polyimide tape.

  According to the present invention, it is possible to prevent the generation of abnormal noise during driving.

  The other features of the present invention and the operational effects thereof will be described in more detail with reference to the accompanying drawings.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which a feeding device according to the present invention is implemented as a linear type feeding device that linearly drives a driven portion will be described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.

  FIG. 1 and FIG. 2 show a plane and side surfaces of the feeding device according to the embodiment of the present invention, respectively. In all the drawings, the understanding of the explanation is given priority, and details such as the top cover are omitted from the actual apparatus.

  The feeding device 41 includes a base 43, an output unit 45, a preload applying mechanism 47, and a guide mechanism 49. The output unit 45 is disposed on the base 43 and includes a pair of Langevin type ultrasonic transducers 51 each including a piezoelectric element, and a cross holding bracket 53. The pair of ultrasonic transducers 51 are supported by the cross holding bracket 53 in such a manner that the axes cross each other as viewed in a plan view. The pair of ultrasonic transducers 51 share a cylindrical output end 55, that is, a single output end 55 is provided at the tip of the pair of ultrasonic transducers 51. In the present embodiment, as an exemplary configuration, the assembly of the ultrasonic transducer 51, the cross holding bracket 53, and the output end portion 55 has a configuration that is symmetric in plan view and is substantially on a symmetric axis. The contact point of the output end 55 with respect to the driven part 42 is located.

  The guide mechanism 49 is provided between the output unit 45 and the base 43, and supports the output unit 45 so as to be slidable so as to be in contact with or separated from the driven unit 42. Normally, the guide mechanism 49 is configured by a roller guide that allows only linear movement in a specific direction.

  A preload applying mechanism 47 is provided on the side opposite to the output end 55 with the ultrasonic transducer 51 and the cross holding bracket 53 interposed therebetween. The preload applying mechanism 47 includes a coil spring 57, a spring receiving plate 59, and a sheet member 61.

  The spring receiving plate 59 is erected on the base 43. A rear end of the coil spring 57 is connected to the spring receiving plate 59. The front end of the coil spring 57 is connected to the rear of the cross holding bracket 53. The preload applying mechanism 47 applies a preload for contacting the driven portion 42 to the output portion 45 by the elastic force of the coil spring 57.

  Further, the form and arrangement of the sheet member will be described with reference to FIG. FIG. 3 is a view showing a cross section of the coil spring perpendicular to the winding axis. The sheet member 61 can be curved in a cylindrical shape, and as a specific example, a polyimide tape (Kapton tape P-221 manufactured by Palmer Cell) can be used. As shown in FIGS. 1 to 3, the sheet member 61 curves around the winding axis of the coil spring 57 and covers the coil spring 57 from the outside. A bonding material 63 is interposed between the sheet member 61 and the coil spring 57. In other words, the sheet member 61 is fixed to the outer peripheral portion of the coil spring 57 by the bonding material 63. The bonding material 63 is composed of an adhesive layer provided on the surface of the polyimide tape constituting the sheet member 61. Further, the sheet member 61 bridges the winding materials constituting the coil spring 57.

  In the feeding device 41 configured as described above, the preload applying mechanism 47 is caused to function from the state where the output portion 45 is in contact with the driven portion 42 as shown in FIG. Give. At this time, the output unit 45 is biased forward by the elastic force of the coil spring 57, and a desired pre-pressure is applied. When a desired preload is applied, a displacement is output from each ultrasonic transducer 51 by applying a current to the ultrasonic transducer 51, and the output displacement is synthesized at the output end 55 to be taken out as a frictional force. The driven part 42 is operated in the driving direction T shown in the figure.

  Furthermore, the operation of the feeding device according to the present embodiment will be described. According to the inventor's investigation, in the existing feeding device, it has been confirmed that abnormal noise is generated while the driven part is driven. Therefore, a test for examining the generation of sound during driving was performed on the feeder according to the present embodiment and the existing feeder shown in FIG. 6 as a comparative example.

  FIG. 4 is a diagram illustrating a state where the feeding device is set in the test device. On the gantry 103 in the test apparatus 101, a stage 105 as a driven unit 42 is slidably provided. On the front surface of the stage 105 on the gantry 103, the feeding device 41 according to the present embodiment or the feeding device of the comparative example is set. A microphone 107 that collects sound generated by the feeding device is provided on the side opposite to the stage 105 in the feeding device, and the microphone 107 is connected to a recording device 109 (mr-1 manufactured by KORG).

  As a test procedure, the feed device 41 according to the present embodiment or the feed device of the comparative example is set in the test device 101 as shown in FIG. 4, the stage 105 is driven for about 1.5 seconds, and about 0 The stage 105 was stopped for about 5 seconds, and the stage 105 was driven again for about 1.5 seconds, and the sound generated during that time was recorded. The result is shown in FIG. (A) of FIG. 5 is a result regarding the feeding device of the comparative example, and (b) of FIG. 5 is a result regarding the feeding device according to the present embodiment.

  As is apparent from FIG. 5, first, in the feeding device of the comparative example, in FIG. 5A, the generation of sound can be confirmed in almost the entire frequency range in both the first driving and the second driving. On the other hand, in the feeding device 41 according to the present embodiment, as shown in FIG. 5B, in the frequency range of 20 [Hz] to 20 [kHz] that tends to be recognized by human ears. The generation of sound was hardly confirmed.

  As described above, according to the feeding device according to the present embodiment, the coil springs 57 are covered with the sheet member 61 in such a manner that the coil springs 57 are curved around the winding axis from the outside, and the winding members constituting the coil springs 57 Is bridged by the sheet member 61, and the phenomenon that abnormal noise is generated while the driven part is driven has been successfully solved.

  Although the contents of the present invention have been specifically described with reference to the preferred embodiments, various modifications can be made by those skilled in the art based on the basic technical idea and teachings of the present invention. It is self-explanatory.

  For example, the present invention is not limited to a mode in which the fed body is moved linearly, and can be implemented as a mode in which, for example, the rotor (driven unit) is rotationally driven.

It is a top view of the feeder which concerns on embodiment of this invention. It is a side view of the feeding device seen from the arrow II of FIG. It is a figure which shows the cross section of the coil spring by the III line | wire of FIG. It is a figure which shows the state by which the feeder was set to the test apparatus. It is a figure which shows the test result regarding generation | occurrence | production of the sound in a feeder. It is a figure which shows the structure of the conventional feeder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 41 Feeder 42 Driven part 45 Output part 47 Preload application mechanism 49 Guide mechanism 51 Ultrasonic vibrator 57 Coil spring 61 Sheet member

Claims (2)

An output unit having an ultrasonic transducer;
A guide mechanism that slidably supports the output unit so as to be in contact with or separated from the driven unit;
A preload application mechanism that applies a preload toward the driven section to the output section;
The preload application mechanism has a coil spring and a sheet member,
The sheet member is curved around the winding axis of the coil spring, covers the coil spring from the outside, and bridges between the winding materials constituting the coil spring;
A bonding material is interposed between the sheet member and the winding material,
The sheet member is fixed to the outer peripheral portion of the coil spring by the bonding material.
Feeder.   The feeding device according to claim 1, wherein the sheet member is a polyimide tape, and the bonding material is an adhesive layer provided on a surface of the polyimide tape.

Images